Re: [Qgis-user] QGIS for safe organization use.

[Madry, Scott via QGIS-User]

A more germane point to our Canadian friend’s query is the fact that the U.S. 
NGA, the National Geospatial-Intelligence Agency, went completely Open Source 
back in 2017 due to the fact that ESRI would not allow them to view the source 
code to check for trap doors, etc. They had been a very large ESRI user up to 
that point. They let out a US$ 36 million contract in 2017 for Open Source 
geospatial software, support, maintenance, etc.

Here in North Carolina, our State Board of Elections went Open Source in 2019 
due to the same issues. So in an important way, Open Source is potentially more 
secure because there is the ability to look at the code for security threats.

And I really don’t think discussing QGIS on a mailing list or chat is covered 
under ITAR…

Best regards to all!

Scott

Scott Madry, Ph.D.
Research Associate Professor of Archaeology
The University of North Carolina at Chapel Hill

Tel 1-919-448-4493
Email:mad...@email.unc.edu
https://scottmadry.web.unc.edu
Skype:   scott madry


On May 23, 2023, at 1:20 PM, Randal Hale via QGIS-User 
mailto:qgis-user@lists.osgeo.org>> wrote:

Greetings from the South of Canada.

So I'm a user and not a programmer by any stretch. The open source license for 
QGIS covers the Software. Your data is your data and no one else's unless you 
physically share it. It's not any less safe than Arcpro. The data it builds is 
compatible with ESRI products (it can build and edit ESRI file Based 
Geodatabases (which I'm guessing may be a requirement)). It's my daily 
driverwell - my only driver for Desktop GIS (I say that and PostGIS will 
make you feel things deep down in your soul).

Anyway - I know that's a short answer but - Enjoy your QGIS'ing. Make Data. 
Enjoy.

Randy




On 5/23/23 12:09, Simon via QGIS-User wrote:
Hello,

I work at the Department of National Defense for the Canadian government and 
had some questions regarding QGIS.

Firstly, I'm working on a project to determine the seismic risk and 
vulnerability of all the department's buildings different Canadian Provinces. 
An important part of the project will be to create a geodatabase containing 
crucial information about each building. After, I plan to create a layer that 
will show the location of these buildings on a map.

Now, a large portion of the information regarding the buildings and their 
locations is confidential, and so I'm wondering if the geodatabase and layer 
that I plan to create will be safe and protected, or if other users will have 
access to them since QGIS is free and open source?

At first, I was planning to work with ArcGIS Pro but I'm currently waiting for 
a license. When or if it comes through, I'll stick with ArcGIS but for now QGIS 
seems to be the best alternative.

If QGIS is not safe, are there other safe and similar softwares you can 
recommend?

Thanks,

Simon




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--
Randal Hale
North River Geographic Systems. Inc

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Re: [Qgis-user] QGIS not installing properly

[Madry, Scott via QGIS-User]

How difficulty would it be to just do what Apple wants and avoid all this?

Curious,

Scott Madry

On Feb 10, 2023, at 2:27 AM, Andrea Giudiceandrea via QGIS-User 
mailto:qgis-user@lists.osgeo.org>> wrote:

Alessandro Pasotti
Thu Feb 9 13:18:33 PST 2023


I am wondering if we (the QGS community) should put this information
somewhere to make it easily findable.


Hi Alessandro,
in the macOS section of the QGIS website Download page there is the following 
note:
"macOS High Sierra (10.13) or newer is required. QGIS is not yet notarized as 
required by macOS Catalina (10.15) security rules. On first launch, please 
right-click on the QGIS app icon, hold down the Option key, then choose Open."

Anyway it seems those instructions are not correct. See the previous thread 
about the same topic [1] and one of the issue reports about macOS installation 
on qgis/QGIS [2] and the issue report on qgis/QGIS-Website [3] filed by me.

Best regards.

Andrea Giudiceandrea


[1] https://www.mail-archive.com/qgis-user@lists.osgeo.org/msg51832.html
[2] https://github.com/qgis/QGIS/issues/51616#issuecomment-1406762797
[3] https://github.com/qgis/QGIS-Website/issues/1105
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Re: [Qgis-user] QGIS and historical battle

[Madry, Scott via QGIS-User]

Hi Ciprian.

There are many examples of such historical/archaeological research. I would 
suggest that you get a decent DEM (and generate slope and aspect) and vector 
hydrology, as Bernd suggested, but I think the most important will be to find a 
series of historical maps of the area. Scan these, or get them in digital 
format already if you can, and then georeference the maps to the modern 
landscape using either current imagery or you can use Openstreetmap or the most 
detailed current governmental data. You don’t say where you are… Once you have 
the maps georeferenced, vector digitize the old roadways, bridges, and other 
relevant features, so you are working back in time. Start with the most recent 
maps and work backwards, and go back as far as you can to the time of the 
battle. Then you can start looking at the intervisibility, time and movement 
along the roads, and see what locations might best fit your historical 
documentary data for what happened. Then you can look on Google Earth and other 
imagery (quickmapservices plugin) for vestiges on the landscape.

You don’t say what your position is, if you are a professional archaeologist or 
simply interested in the history, but do be aware that it is generally illegal 
to conduct excavations or ground surveys without proper archaeological permits 
and without the permission of the land owner. Cultural resources laws vary, but 
it is best to consult the local museum or archaeologists before any digging.

Feel free to contact me,

Scott

Scott Madry, Ph.D.
Research Associate Professor of Archaeology
The University of North Carolina at Chapel Hill

Tel 1-919-448-4493
Email:mad...@email.unc.edu
https://scottmadry.web.unc.edu
Skype:   scott madry




On Feb 3, 2023, at 9:32 AM, Bernd Vogelgesang via QGIS-User 
mailto:qgis-user@lists.osgeo.org>> wrote:

Hi,
I'm no archaeologist, but I know that there are quite some of them
around on this list.

First short answer: yes, of course!

First counter-question: What kind of geodata is already available to you?

Actually, I think you just need 3 data-sets:
a digital terrain model to find observation spots and valleys
a vector of rivers to find the confluences
a point vector of (historic) towns

Unfortunately you did not mention how big the possible region for this
battle is, so it is hard to guess if it makes sense to create a real
simulation model, or if places can be identified in a semi-manual way.

I think it would be useful to keep the discussion on the list, so others
can learn from the example as well.
Though this is not my business, I am always interested in such kind of
"riddles".

For a starter: There is the great Visibility Analysis Plugin of Zoran
Čučković, where you can create a Visibility Index on a terrain data-set
which I think is exactly meant to identify outlook spots in the
landscape for a given radius.

Cheers,
Bernd


Am 03.02.23 um 09:20 schrieb Lazanu Ciprian-Cătălin via QGIS-User:
Hello,
I want to start a project with a great challenge:

 * first an introduction - a battle between two armies in the medieval
   period. we have a few pieces of information regarding this battle:
   the number of soldiers from both armies (army A with ~ 25.000/30.000
   soldiers and army B between 50.000 and 100.000 - medieval chronicles
   have different numbers) and incomplete information regarding the
   exact place of the battle. all we know is that it was on a river
   valley and the main battle was regarding controlling a bridge at the
   confluence of 2 rivers. another clue is that the battle was at a
   short distance from an important city (name Town) which is located
   in that river valley. Army B was marching on the river valley to
   take the city Town and met army A at a short distance from the city.
   The battle was around a bridge on the river. That is all we know.
   (Army A won that battle).
 * what I want ... I want to see if I could locate that battle (so l
   could make some archaeological investigation after that) using some
   simulators ... for example: to see how long the marching formation
   of army B (50.000 to 80.000/90.000 soldiers) was to see the
   distribution on the field/road to city Town.
 * another clue ... we know that the commander of army A (the defender)
   had a small base fortification from where he could see and command
   the army and make orders. such a place is visible now on a hill from
   where you could see at 15 - 20 km down the river valley. (I know
   that l could use visibility analysis). On the ground, the surface is
   no visible traces of that battle.

This battle is an important historical moment in the history of my
country and has an important local value.
So, is there anything in QGIS or other GIS software something to work so
l can make a simulation or something like that regarding this kind of
activity?
Thank you in advance ... and any suggestions could be sent via email in
private too.
Ciprian

[Qgis-user] Mac problem

[Madry, Scott via QGIS-User]

I have a student using Monterrey 12.5.1 trying to load QGIS and they get this, 
and the regular process of going to systems prefs/privacy, etc. does not work… 
Any suggestions?
 [cid:95B38F8C-3A4A-4CC4-B831-D4051003EA0F]
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[Qgis-user] Airborne camera rectification

[Madry, Scott via QGIS-User]

Hello list. First of all, thanks to all of you for helping make the QGIS 
community the very special thing that it is.

I will be involved in a stratospheric balloon launch in January (altitude ~30 
km), and it will have a nadir-pointing RGB camera that will have it’s images 
telemetered to the ground. It is nadir-pointing, but will have random swaying 
motion in all axes. Does anyone have experience in reading the 6 parameters of 
exterior orientation (X, Y, Z, w, f, k (Rotations about x, y, z axes 
respectively)) from the EXIF header attached to the JPEG and using it to 
georectify the images as well as can be done in QGIS? We are hoping to compare 
the various images at different altitudes with satellite imagery acquired at 
about the same time.

Thank you so much, and happy new year to everyone!

Scott

Scott Madry, Ph.D.
Research Associate Professor of Archaeology
The University of North Carolina at Chapel Hill

Tel 1-919-448-4493
Email:mad...@email.unc.edu
https://scottmadry.web.unc.edu
Skype:   scott madry

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Re: [Qgis-user] Convert huge shapefile to small size

[Madry, Scott via Qgis-user]

Thanks Chris, but I do think that this is a topic is worth considering by the 
QGIS community, beyond the limitations of the archaeic shapefile format. We are 
moving into an era of very big data, both raster and vector, and QGIS should be 
able to meet this challenge. This will require some foresight and planning, 
thus my raising the issue. Or not...

Best,

Scott

On Jul 28, 2022, at 4:05 PM, chris hermansen 
mailto:clherman...@gmail.com>> wrote:

Scott and list,

With respect I think this conversation is moving off the point, which was 
related to a 5gb shapefile

https://en.m.wikipedia.org/wiki/Shapefile

Which is beyond the design limits of the Shapefile standards and perhaps 
therefore the source of the problem that the OP has.

Notably not a limitation of QGIS

On Thu, Jul 28, 2022, 10:45 Madry, Scott via Qgis-user 
mailto:qgis-user@lists.osgeo.org>> wrote:
Dear colleagues,

As we move more into the world of big data, IOE, data mining, and data 
analytics, dealing with larger and larger data sets will become required, and, 
eventually, the norm.

GRASS GIS has made very good progress in this regard, optimizing the code to 
run on massively parallel computer architectures, with very good effect:

https://grasswiki.osgeo.org/wiki/Supercomputing

Perhaps it is time for QGIS to consider this in its future development plans? 
We will certainly be needing this in the future.

And thanks to all the team who keep the QGIS train running, I am constantly 
amazed at the energy, effort, and availability of people to the broader 
community.

Scott

Scott Madry, Ph.D.
Research Associate Professor of Archaeology
The University of North Carolina at Chapel Hill

Tel 1-919-448-4493
Email:mad...@email.unc.edu<mailto:mad...@email.unc.edu>
https://scottmadry.web.unc.edu<https://scottmadry.web.unc.edu/>
Skype:   scott madry



On Jul 28, 2022, at 10:14 AM, jhubbslist--- via Qgis-user 
mailto:qgis-user@lists.osgeo.org>> wrote:

Past a point, trying to run a GIS app with very large data structures just 
doesn't work well. If you really need all the information you're carrying 
around for your analysis or whatever, you may need to reach for different tools 
or use the tools you have differently.

I assume it's not so much the >5GiB of disk space that's the issue and that 
you've maxxed out the CPU, graphics, and disk I/O rate as much as is practical 
so mostly it's a matter of how long it takes maps etc. to paint onscreen. It 
may help you to move the heavy-lift onto PostgreSQL/PostGIS where you can make 
use of spatial indexing. Or, you can craft your operations the way you want 
them in QGIS but do the actual work with e.g. GDAL calls in Python. I spoke 
with someone a couple weeks ago whose particular GIS process worked better in 
GRASS than in QGIS, so that's something you might look into as well.

On 7/28/22 7:52 AM, krishna Ayyala via Qgis-user wrote:
dbf file itself is 5.1GB. Rest all other files are less than 500MB. It is the 
number of records which is huge. It has about 117,2100 points.

On Thu, Jul 28, 2022 at 12:02 AM Bernd Vogelgesang via Qgis-user 
mailto:qgis-user@lists.osgeo.org>> wrote:
how big is the dbf file of that shape? Maybe you can also drop some
attributes.

Am 28.07.22 um 03:46 schrieb krishna Ayyala via Qgis-user:
> Hello,
> I have a shapefile of 5GB in size. Is it possible to convert this
> shapefile to a smaller size file? It can be any format, not
> necessarily a shapefile. But, preferably a vector format. I tried to
> convert it into tiles, but that didn't work as it was losing the
> resolution. I am looking to convert this 5GB size file to about 500MB.
>
> Regards.
>
> ___
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Re: [Qgis-user] Convert huge shapefile to small size

[Madry, Scott via Qgis-user]

Dear colleagues,

As we move more into the world of big data, IOE, data mining, and data 
analytics, dealing with larger and larger data sets will become required, and, 
eventually, the norm.

GRASS GIS has made very good progress in this regard, optimizing the code to 
run on massively parallel computer architectures, with very good effect:

https://grasswiki.osgeo.org/wiki/Supercomputing

Perhaps it is time for QGIS to consider this in its future development plans? 
We will certainly be needing this in the future.

And thanks to all the team who keep the QGIS train running, I am constantly 
amazed at the energy, effort, and availability of people to the broader 
community.

Scott

Scott Madry, Ph.D.
Research Associate Professor of Archaeology
The University of North Carolina at Chapel Hill

Tel 1-919-448-4493
Email:mad...@email.unc.edu
https://scottmadry.web.unc.edu
Skype:   scott madry



On Jul 28, 2022, at 10:14 AM, jhubbslist--- via Qgis-user 
mailto:qgis-user@lists.osgeo.org>> wrote:

Past a point, trying to run a GIS app with very large data structures just 
doesn't work well. If you really need all the information you're carrying 
around for your analysis or whatever, you may need to reach for different tools 
or use the tools you have differently.

I assume it's not so much the >5GiB of disk space that's the issue and that 
you've maxxed out the CPU, graphics, and disk I/O rate as much as is practical 
so mostly it's a matter of how long it takes maps etc. to paint onscreen. It 
may help you to move the heavy-lift onto PostgreSQL/PostGIS where you can make 
use of spatial indexing. Or, you can craft your operations the way you want 
them in QGIS but do the actual work with e.g. GDAL calls in Python. I spoke 
with someone a couple weeks ago whose particular GIS process worked better in 
GRASS than in QGIS, so that's something you might look into as well.

On 7/28/22 7:52 AM, krishna Ayyala via Qgis-user wrote:
dbf file itself is 5.1GB. Rest all other files are less than 500MB. It is the 
number of records which is huge. It has about 117,2100 points.

On Thu, Jul 28, 2022 at 12:02 AM Bernd Vogelgesang via Qgis-user 
mailto:qgis-user@lists.osgeo.org>> wrote:
how big is the dbf file of that shape? Maybe you can also drop some
attributes.

Am 28.07.22 um 03:46 schrieb krishna Ayyala via Qgis-user:
> Hello,
> I have a shapefile of 5GB in size. Is it possible to convert this
> shapefile to a smaller size file? It can be any format, not
> necessarily a shapefile. But, preferably a vector format. I tried to
> convert it into tiles, but that didn't work as it was losing the
> resolution. I am looking to convert this 5GB size file to about 500MB.
>
> Regards.
>
> ___
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> Qgis-user@lists.osgeo.org
> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
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Re: [Qgis-user] information depth from landsat

[Madry, Scott]

Passive electro-optical imagers in orbit like Landsat have no penetration 
ability into ground or vegetation. It only measures the very top surface 
properties. There is well understood water penetration in the visible bands, 
primarily the blue band, and there are several articles in the literature. If 
you wish to actually penetrate soil you need to move into the microwave (radar) 
bands, and even there, it is severely attenuated by moisture and only works in 
very dry areas, also well describes in the literature. Ground penetrating radar 
dragged by sleds on the ground do have very good penetration generally, but not 
from airborne or satellite sensors.

I hope this helps,

Scott Madry

On Jan 11, 2022, at 2:16 PM, jean Lukusa 
mailto:luku...@gmail.com>> wrote:

Hi all .
As you know , we usually  extract some informations from landsat . For instance 
, lineaments , alterations , etc.
So I want to know , what is the maximum depth undeground the above-mentionned 
informations are collected ?


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Re: [Qgis-user] Scraping Place of Interest data from Google Map API

[Madry, Scott]

Hi, Tsering.

You should look at the excellent Geofabrik.de data server 
from Germany:

https://download.geofabrik.de

They do a midnight download each night of all the OSM data, and covert it by 
continent and country to shapefiles and serve it for free each night.

While it may not have as much detail as you may wish, it is an excellent start, 
anywhere on the globe, and you can go from there with adding your own data.

Thanks to the Geofabrik team for this excellent public service!

Scott Madry



On Nov 30, 2020, at 6:30 PM, Tsering W. Shawa 
mailto:shaw...@princeton.edu>> wrote:

Have any institutions purchased a subscription to scrape data from Google Maps 
using their API? One of our faculty members is interested in extracting place 
of interest (POI) data such as banks, mosques, airports, casinos, etc. of 
Middle Eastern countries. A faculty member and her group tried to extract the 
Google Map data, but they reached the limit, and they are no longer allowed to 
scrape data. I am looking for any suggestions or advice on purchasing a 
subscription for academic use, or on companies who sell these types of data.

Initially we thought we could download the data from Open Street Map but when 
we compared data downloaded from Open Street Map (OSM) to data downloaded from 
Google map, we found that Google has many more data points than OSM. Since OSM 
is a crowd source platform, we understand their limitations.

Many thanks,
-Wangyal

Tsering Wangyal Shawa
GIS and Map Librarian
Head, Map and Geospatial Information Center
Peter B. Lewis Library, Room 226
Washington Road & Ivy Lane
Princeton University, Princeton, NJ 08544
Telephone: 609-258-6804
shaw...@princeton.edu
http://library.princeton.edu/collections/pumagic

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Re: [Qgis-user] Alternative to Evis plugin to view images with relative path

[Madry, Scott]

Hello Fabio and list.  And thank you all for your service to our community.

I also use(d) eVis a lot, and know of quite a few others who do field work 
(ecologists, geologists, botanists, archaeologists)  who use it and like it for 
its simplicity and utility.

Many of the end users of QGIS who are not developers have different 
perspectives and needs, and might also be included in such decisions, if at all 
possible. Adding new features is great, but taking away useful capabilities 
should have a higher bar to cross,  it seems. Just my view.

Is there a way that eVis can be reinstated?

Thanks,

Scott Madry

Scott Madry, Ph.D.
Research Associate Professor of Archaeology
The University of North Carolina at Chapel Hill

Tel 1-919-448-4493
Email:mad...@email.unc.edu<mailto:mad...@email.unc.edu>
https://scottmadry.web.unc.edu
Skype:   scott madry



On Oct 11, 2020, at 12:01 PM, Fabio Giacomazzi 
mailto:fabiogiacomazzi...@gmail.com>> wrote:

Thanks folks,
I work with Sw maps (field data collector) that generates shapefiles in which a 
field  links to images through relative path. So I think ImportPhotos plugin is 
not useful (I need to maintain the original shapefile with relative path to 
images anche other fields associated). Now I try the solution through widgets 
...
Bye!


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Il giorno dom 11 ott 2020 alle ore 17:22 Bernd Vogelgesang 
mailto:bernd.vogelges...@gmx.de>> ha scritto:

You could try to work with the ImportPhotos plugin. Though it seems to be buggy 
and there seems to be no active development on it.

On 11.10.20 10:17, Fabio Giacomazzi wrote:

The Evis plugin is no longer available for the latest version of Qgis. Evis
was a simple and effective tool for opening images with a relative path.
What equally easy-to-use alternative exists? Wasn't it convenient to keep
Evis?

<http://www.avg.com/email-signature?utm_medium=email_source=link_campaign=sig-email_content=webmail><http://www.avg.com/email-signature?utm_medium=email_source=link_campaign=sig-email_content=webmail>
Mail
priva di virus. www.avg.com<http://www.avg.com/>
<http://www.avg.com/email-signature?utm_medium=email_source=link_campaign=sig-email_content=webmail><http://www.avg.com/email-signature?utm_medium=email_source=link_campaign=sig-email_content=webmail>
<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>





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Re: [Qgis-user] Two zones UTM covering Mining Licence Area

[Madry, Scott]

You can artificially extend the southern zone numbers up in Easting and 
Northing to include the northern zone, if it is not too far. This is commonly 
done where two UTM zones make up a study area.

I hope this helps,

Scott Madry


On Aug 15, 2020, at 12:59 PM, chris hermansen 
mailto:clherman...@gmail.com>> wrote:

Jean and list

On Sat, Aug 15, 2020, 09:16 jean Lukusa 
mailto:luku...@gmail.com>> wrote:
Hi all. I Hope you are doing Well.
I 'am planning soil sampling program in m'y country DRC.
Unfortunatelly ,my licence area is covered by two UTM zones (35 North ans 
36North.  How Can work in order not to make error ? Can I consider just one 
zone ? Can I uze another metric cordinate system ?

You may want to project into one or the other of the zones. This is useful 
particularly in the case where you want to line up adjacent line or polygon 
features (like water courses or land cover) prior to merging them.

You might also want to consider putting everything in a non UTM projection. But 
UTM is appropriate for area calculation for example.
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Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

[Madry, Scott]

I hate to plug my own… but my book on GNSS may also be of interest, not too 
much either!

https://www.springer.com/gp/book/9781493926077

Scott



On May 23, 2020, at 8:27 PM, Nicolas Cadieux  
wrote:


Hi,

I see lot's of people are interested in this topic.  I recommend reading this 
basic Guide on GPS Positioning.  
https://www.rncan.gc.ca/sites/www.nrcan.gc.ca/files/earthsciences/pdf/GPS_Guide_e/GPS_Guide_e.pdf

It's an older guide, (before waas, glonas, and even before GPS clock signal was 
"liberated".) but it will explain different types of GPS, how positions are 
found (code positioning vs carrier positioning), source of errors...  Have fun 
reading. After that, you will understand why we get the result we get with a 
consumer (single point code positioning) GPS.

So basically, after this guide, the GPS full constellation was finished, single 
point GPS went from a 100m accuracy to 10m because the US stopped reducing the 
clock precision, WAAS was introduced, other GNSS constellations were put up.

Nicolas

On 2020-05-23 4:43 p.m., Madry, Scott wrote:
Hello all. Regarding GNSS precision, I also find useful the Trimble online GNSS 
planning website:

https://www.gnssplanning.com/#/settings

Which lets you pick a location and timeframe, and it will show you the real 
time status of each GNSS constellation, and lets you pick some or all. It will 
compute your DOP, number of satellites from each constellation in view, a sky 
plot, and also ionospheric index, TEC (Total Electron Content), and 
scintillation. This is all useful for planning when would be the optimum time 
to do your field measurements. A good teaching tool for GNSS as well.

My experience with GNSS is that you do get what you pay for. A ~$200 Garmin 
with WAAS gives us reliable ~2meters, cell phones ~10 meters, and you can pay 
for ~ cm with the surveying class kinematic systems. It all depends on what you 
are measuring and what precision you require.

Scott Madry

On May 23, 2020, at 3:53 PM, Mike Hyslop 
mailto:mdhys...@mtu.edu>> wrote:

If you don't want to attempt to engineer your own GNSS hardware + software, you 
may want to check out the Bad Elf GNSS Surveyor. Yes, it's in the neighborhood 
of $500 US, but gives relatively consistent positions within about 1 meter with 
averaging, its data can be differentially corrected using the RTKLIB 
open-source software, and if you are working in an area with cell service, it 
can receive real-time corrections via NTRIP networks if this is available in 
your area (it is here in Michigan). Some Googling will turn up tutorials. I 
have done some simple comparisons with Trimble hardware and have been pleased 
with the results.

Best,
Mike

On Sat, May 23, 2020 at 3:45 PM 
mailto:j.hu...@post-ist-da.de>> wrote:
Hi Nicolas,

there are several potentially accurate GNSS modules available, even sensitive 
choke ring antennas aren't that expensive. What's time consuming and difficult 
is building a whole functioning system (integration and software).
This would be a great university project - develop an open source GNSS system 
based on relatively unexpensive components. It should be possible to get the 
cost down from over a thousand to several hundred euro. This could also be the 
basis for a "free" correction data service built on private reference stations. 
Just dreaming...

I agree that for precision, "old school" technology is often better and 
cheaper, although it requires more effort than simply pushing a button.

Regards
Jochen

Am 23.05.20 um 20:21 schrieb Nicolas Cadieux:
Hi,

I looked at the page.It looks like a neat project!  Buy time you buy a case, 
antenna... (I don’t think they come with on), your back into the price range of 
a forestry grade survey GPS unit.  I think the Emild single band gps 
(https://emlid.com/reachrs/ <https://emlid.com/reachrs/> ) is probably a better 
choice unless you really want to make this a learning project. But if I 
understand you are really on a shoe string budget.

None of these Gps, by the way, would beat and old theodolite...  if you can 
establish or find a good gps position (look for the city or state geomatics 
services) or survey point,  a théodolite would give you survey grade positions. 
 City have these points on every few blocks.  You may be able to find A 
theodolite for free.  A second hand TotalStation could be better but that will 
be more difficult to find in those price ranges (Shoe string).  You can also 
rent equipment or find a college that would take this up as a teaching 
opportunity.

Have fun!

Nicolas Cadieux
Ça va bien aller!

Le 23 mai 2020 à 13:52, Bernd Vogelgesang 
<mailto:bernd.vogelges...@gmx.de> a écrit :



Unfortunately, the Forest Service Website went offline (maybe this thread 
caused so much traffic that it broke down? ;) )

I'm also desperately searching for an affordable way to have at least some 
decent accuracy. I do not need submeter, but it would be f

Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

[Madry, Scott]

Hello all. Regarding GNSS precision, I also find useful the Trimble online GNSS 
planning website:

https://www.gnssplanning.com/#/settings

Which lets you pick a location and timeframe, and it will show you the real 
time status of each GNSS constellation, and lets you pick some or all. It will 
compute your DOP, number of satellites from each constellation in view, a sky 
plot, and also ionospheric index, TEC (Total Electron Content), and 
scintillation. This is all useful for planning when would be the optimum time 
to do your field measurements. A good teaching tool for GNSS as well.

My experience with GNSS is that you do get what you pay for. A ~$200 Garmin 
with WAAS gives us reliable ~2meters, cell phones ~10 meters, and you can pay 
for ~ cm with the surveying class kinematic systems. It all depends on what you 
are measuring and what precision you require.

Scott Madry

On May 23, 2020, at 3:53 PM, Mike Hyslop 
mailto:mdhys...@mtu.edu>> wrote:

If you don't want to attempt to engineer your own GNSS hardware + software, you 
may want to check out the Bad Elf GNSS Surveyor. Yes, it's in the neighborhood 
of $500 US, but gives relatively consistent positions within about 1 meter with 
averaging, its data can be differentially corrected using the RTKLIB 
open-source software, and if you are working in an area with cell service, it 
can receive real-time corrections via NTRIP networks if this is available in 
your area (it is here in Michigan). Some Googling will turn up tutorials. I 
have done some simple comparisons with Trimble hardware and have been pleased 
with the results.

Best,
Mike

On Sat, May 23, 2020 at 3:45 PM 
mailto:j.hu...@post-ist-da.de>> wrote:
Hi Nicolas,

there are several potentially accurate GNSS modules available, even sensitive 
choke ring antennas aren't that expensive. What's time consuming and difficult 
is building a whole functioning system (integration and software).
This would be a great university project - develop an open source GNSS system 
based on relatively unexpensive components. It should be possible to get the 
cost down from over a thousand to several hundred euro. This could also be the 
basis for a "free" correction data service built on private reference stations. 
Just dreaming...

I agree that for precision, "old school" technology is often better and 
cheaper, although it requires more effort than simply pushing a button.

Regards
Jochen

Am 23.05.20 um 20:21 schrieb Nicolas Cadieux:
Hi,

I looked at the page.It looks like a neat project!  Buy time you buy a case, 
antenna... (I don’t think they come with on), your back into the price range of 
a forestry grade survey GPS unit.  I think the Emild single band gps 
(https://emlid.com/reachrs/  ) is probably a better 
choice unless you really want to make this a learning project. But if I 
understand you are really on a shoe string budget.

None of these Gps, by the way, would beat and old theodolite...  if you can 
establish or find a good gps position (look for the city or state geomatics 
services) or survey point,  a théodolite would give you survey grade positions. 
 City have these points on every few blocks.  You may be able to find A 
theodolite for free.  A second hand TotalStation could be better but that will 
be more difficult to find in those price ranges (Shoe string).  You can also 
rent equipment or find a college that would take this up as a teaching 
opportunity.

Have fun!

Nicolas Cadieux
Ça va bien aller!

Le 23 mai 2020 à 13:52, Bernd Vogelgesang 
 a écrit :



Unfortunately, the Forest Service Website went offline (maybe this thread 
caused so much traffic that it broke down? ;) )

I'm also desperately searching for an affordable way to have at least some 
decent accuracy. I do not need submeter, but it would be fantastic if it was 
possible to achieve meter accuracy.
I gave up on that Garmin stuff. They might be accurate, but I have no chance to 
control this until I return home and put the recorded data on screen over an 
aerial image. Those screens are a joke, and the business logic that prevents me 
to put reasonable aerial imagery on the device without paying a fortune is 
apita. Maybe this improved cause I last checked 5 years ago.

Mobile phones at least in my case seem to get worse. My Motorola from 2016 had 
an accuracy of less than 4 meters, most of the time less than 2.
Now I bought a Huawei 30 pro cause of the camera (my first phone with nice 
pictures!), but the accuracy is a nightmare. The position is jumping around 
like a dog on rabies.
I also bought a bluetooth device (Navilock BT-821G) two years ago. This is much 
better than the phones GPS, tho it only receives 20 satellites maximum (The 
phone claims to receive some 40). But also this device sometimes, when walking 
a transect, is constantly 5 meters off the track for several several minutes.

As apps averaging the positions were mentioned: Does anyone 

[Qgis-user] manual vs auto labeling

[Madry, Scott]

Hello, all, and thank you for all you do for the QGIS community.

I am posting a question from a colleague in Sweden. Sorry, don’t have more 
details than this. Perhaps someone has an answer?

Thanks,

Scott Madry

In the old 3.x version of Esri ArcView there was an easy-to-use labeling tool. 
By activating it I could first set up which attribute table column to use for 
labels, and then just click on desired objects in the map, and a label would 
appear on them, and them only. In the later ArcMap this feature was removed, 
and I have not found anything similar in Qgis either.

When labeling features in a map every object gets a label via the layers 
properties, and I must remove all unwanted ones manually, which can be a huge 
job, not to mention tedious... It had been very easy to instead just mark the 
ones I want labeled, as in ArcView 3.x. Of course I am not sure if it's me who 
simply has not found that function in Qgis, but colleagues of mine have not 
found it either, so... is there such a function? ;-)

Thanks, Stefan N.
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[Qgis-user] Save a 3D animation?

[Madry, Scott]

Hello all. I am experimenting with the new 3D View function, and want to save 
an animation that I have created to put it into a PowerPoint and website, but I 
do not see any option to save the animation. I am running 3.4.13 on a Mac High 
Sierra, 10.13.6. If this is not now possible, it seems to be an important next 
addition? The GRASS NViz has several additional useful functions that might be 
also considered for further development.

Thank you all for the excellent efforts that you make on the behalf of all the 
QGIS users,

Scott Madry

Scott Madry, Ph.D.
Research Associate Professor of Archaeology
The University of North Carolina at Chapel Hill

Tel 1-919-448-4493
Email:mad...@email.unc.edu<mailto:mad...@email.unc.edu>
https://scottmadry.web.unc.edu
Skype:   scott madry
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Re: [Qgis-user] Drill hole section with QGIS 3

[Madry, Scott]

This is also of interest to the archaeological community, in terms of 3-D 
representations of excavations, soil strata, location of artifacts, etc. GRASS 
has Voxel capabilities that allow this, but additional tools like this would be 
of interest to archaeologists.

Regards,

Scott Madry

Scott Madry, Ph.D.
Research Associate Professor of Archaeology
The University of North Carolina at Chapel Hill

Tel 1-919-448-4493
Email:mad...@email.unc.edu<mailto:mad...@email.unc.edu>
https://scottmadry.web.unc.edu
Skype:   scott madry


On Mar 15, 2018, at 10:00 AM, Ramon Andinach 
<cust...@westnet.com.au<mailto:cust...@westnet.com.au>> wrote:


This sender failed our fraud detection checks and may not be who they appear to 
be. Learn about spoofing<http://aka.ms/LearnAboutSpoofing>
Feedback<http://aka.ms/SafetyTipsFeedback>
Hi Calvin,

In geology, we use a set of drill holes into the ground to interpret the space 
in the earth between them. Depending on what the geologist is interested in, we 
might be plotting the location of an aquifer, or a gold seam, an oil reservoir 
or some other feature. Note here, that I’m deliberately picking things that 
have length, breath and depth, so just interpolating a surface is not the same 
thing.

So, things that you might want to be able to do include:
 display attributes of the drill hole on a string representing the drill hole 
(or drill trace) in real 3D space.
 Create slices (sections) of these drill traces (so depth is the right and left 
side), with windows of included data on either side of the slice.
 Draw polygons snapped to the drill trace to link areas with similar features 
between holes.
 Build a mesh/wireframe model that links the polygons together
 Get a volume of said model
 Create a voxel model of an attribute/s distribution within the mesh.

This is probably a slightly economic geology skewed view, but hopefully I’ve 
left enough geo-jargon out that it’s understandable[1]

Depends on how complex you want to be. A well known GIS package in my neck of 
the woods trumpets the ability to do the slice and dice and section bit, but 
really it’s making up non-earth plans and dressing them up as having proper 
depth (a section). For some people that seems enough.
But - that sort of approach makes it really difficult if what you’d really like 
to do is show just the bits of the drill holes with say, gold grades greater 
that 20g/t - leaving any other result as transparent - and spin it slowly 
around in 3D so that you can get a sense of the go/d’s distribution pattern. 
This last one is much more complex and only possible if you’re working in a 
truly 3D environment.

Hope that makes some sort of sense. Feel free to ask for clarification.

Ramon.
[1] I’ve made an attempt to swap out terms I’m used to using for more generic 
explanations or more comp sci friendly terms. Hopefully, mostly understandable 
to both sides now.


On 15 Mar 2018, at 20:31, C Hamilton 
<adenacult...@gmail.com<mailto:adenacult...@gmail.com>> wrote:

Pardon my ignorance on the matter, but what does a drill hole capability mean? 
Is it simply making a hole in a polygon or is it much more complex.

Thanks,

Calvin

On Wed, Mar 14, 2018 at 3:46 PM, John Harrop 
<jchar...@gmail.com<mailto:jchar...@gmail.com>> wrote:
It looks like no one has been answering this for you yet and I’m just catching 
up on a few days emails after my computer was in the shop.

There is active interest in developing a drill hole plugin for QGIS3 now that 
3D is more fully supported.  I also work with drill holes and have been running 
them in QGIS fairly easily in plan view where I just calculate traces to a plan 
view (either in a spreadsheet or using code) and apply theme patterns based on 
the attributes I kept with the segments.  This has worked reasonable well with 
grade and lithology which are two of the main things you want to see.

Cross sections have been harder, but those are still “maps” in non-Earth 
coordinates.  Again I’ve tended to build those with projections to a plane in 
either a spreadsheet or by code.  This is not as easy to work with as plan view 
so I am very interested in seeing the developing interest in getting a drill 
hole section plugin for QGIS.  That will really finalize QGIS as the logical 
choice for geological exploration work.

I’ve cc’ed the others I know using QGIS so I hope you can be included in the 
list of interested users.

Regards,

John Harrop, PGeo, FGS
Senior Project Geologist
Coast Mountain Geological Ltd

PO Box 62
Suite 488 - 625 Howe St
Vancouver, BC   V6C 2T6

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Re: [Qgis-user] QGIS 3 OS X/macOS

[Madry, Scott]

Scott Madry

and just FYI, I had to load matplotlib and scipy to get the Semi Automatic 
Classification plugin to work.

S
> On Mar 12, 2018, at 7:31 PM, Nyall Dawson  wrote:
> 
> On 13 March 2018 at 04:29, William Kyngesburye  wrote:
>> Sorry for the long wait.  It's been a hectic year - personal life changes 
>> (marriage), but I'm finally getting back into gear.
>> 
>> My QGIS 3 package for OS X/macOS is ready.
> 
> Champion! I'm sure you've made a lot of people very happy with this
> announcement.
> 
> For those who know what you do, your work is very much valued! It's a
> shame that packaging is somewhat underappreciated and under-supported
> by the wider QGIS user community :(
> 
> Nyall
> 
> 
>  Besides the big QGIS release, there are a couple other big changes
> in the packaging.
>> 
>> - Minimum OS X 10.10 Yosemite
>> 
>> - Requires Python 3.6 from python.org (note it must be this and not homebrew 
>> or other distribution).
>> 
>> - except for what I include in the GDAL Complete package, all extra 
>> necessary python modules are available from pypi with pip.  These are 
>> installed by the QGIS installer and need an internet connection at that time.
>> 
>> Make sure to install Python 3 first, otherwise the GDAL Complete python 
>> components will not be installed (these are also required by QGIS).
>> 
>> Currently the globe plugin is not included, but I'll get that out in an 
>> update soon.  The new QGIS 3D features are included.
>> 
>> GDAL format plugins will follow soon (ECW, MrSID, GRASS).
>> 
>> -
>> William Kyngesburye 
>> http://www.kyngchaos.com/
>> 
>> The equator is so long, it could encircle the earth completely once.
>> 
>> ___
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Re: [Qgis-user] QGIS 3 OS X/macOS

[Madry, Scott]

The Semi-Automatic Classification Plugin also requires Matplotlib, (see below) 
and I need to use it.

Can this be added quickly, or is there a simple way to load it on a Mac?

Thanks,

Scott Madry
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Re: [Qgis-user] QGIS 3 OS X/macOS

[Madry, Scott]

Yet another big Hooray for William and all those who make the Mac 3.0 happen! 
Very much appreciated by many.

Thanks again,

Scott


On Mar 12, 2018, at 8:34 PM, Mike Hyslop 
> wrote:

I have to second what Nyall said. Thanks to William for all the work packaging 
QGIS.

Some feedback: installation was straightforward and painless. It took less than 
15 minutes start to finish to upgrade to QGIS 3, and I still have access to 
python 2 and 3, plus QGIS 2.18 and 3.0. Kudos and thanks!

Mike

On Mon, Mar 12, 2018 at 7:31 PM, Nyall Dawson 
> wrote:
On 13 March 2018 at 04:29, William Kyngesburye 
> wrote:
> Sorry for the long wait.  It's been a hectic year - personal life changes 
> (marriage), but I'm finally getting back into gear.
>
> My QGIS 3 package for OS X/macOS is ready.

Champion! I'm sure you've made a lot of people very happy with this
announcement.

For those who know what you do, your work is very much valued! It's a
shame that packaging is somewhat underappreciated and under-supported
by the wider QGIS user community :(

Nyall


  Besides the big QGIS release, there are a couple other big changes
in the packaging.
>
> - Minimum OS X 10.10 Yosemite
>
> - Requires Python 3.6 from python.org (note it must be 
> this and not homebrew or other distribution).
>
> - except for what I include in the GDAL Complete package, all extra necessary 
> python modules are available from pypi with pip.  These are installed by the 
> QGIS installer and need an internet connection at that time.
>
> Make sure to install Python 3 first, otherwise the GDAL Complete python 
> components will not be installed (these are also required by QGIS).
>
> Currently the globe plugin is not included, but I'll get that out in an 
> update soon.  The new QGIS 3D features are included.
>
> GDAL format plugins will follow soon (ECW, MrSID, GRASS).
>
> -
> William Kyngesburye 
> http://www.kyngchaos.com/
>
> The equator is so long, it could encircle the earth completely once.
>
> ___
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Re: [Qgis-user] Mac OS X Install Notes

[Madry, Scott]

A 3.0 Mac build guide for average (non techie) Mac users would be VERY much 
appreciated by many, including me!

Scott Madry

Scott Madry, Ph.D.
Research Associate Professor of Archaeology
The University of North Carolina at Chapel Hill

Tel 1-919-448-4493
Email:mad...@email.unc.edu<mailto:mad...@email.unc.edu>
https://scottmadry.web.unc.edu
Skype:   scott madry




On Feb 28, 2018, at 3:17 PM, Richard Duivenvoorde 
<rdmaili...@duif.net<mailto:rdmaili...@duif.net>> wrote:

average (non techie) Mac users

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Re: [Qgis-user] Mac OS X testing for QGIS 3

[Madry, Scott]

Hi all.

As a dedicated Mac QGIS user, trainer, and research. I want to put in a plea to 
keep the Mac OS development process on pace. There are many of us out there who 
use the Mac OS version, and we need to get these issues with matplotlib, GRASS, 
and others addresses so that we have a good 3.0 rollout.

I would be happy to assist with testing, thanks for all your efforts,

Scott

Scott Madry, Ph.D.
Research Associate Professor of Archaeology
The University of North Carolina at Chapel Hill

Tel 1-919-448-4493
Email:mad...@email.unc.edu
https://scottmadry.web.unc.edu
Skype:   scott madry

On Feb 14, 2018, at 12:20 PM, John Harrop 
> wrote:

Burghardt,

Thanks for the pointers, they seen much more up to date than the older ones 
pointed to by the QGIS web site.

I’ve been trying to build from the notes since you posted your suggestion and I 
see what you mean about the matplotlib problem. I forked the Mac OS X build 
notes on GitHub and started to work on them to see if I could get a working set 
for the matplotlib problems but not much luck.  However, I do seem to have it 
installed through pip or otherwise, so I worked past that step and have been 
trying to get CMake to configure a makefile but there are problems there as 
well.  I fixed a missing library by manually installing but I’m now having 
problems with Qt5Positioning which is not being found.

its been a while since I was active in configuring build systems so I’m having 
to clean off the dust in my memories and learn newer versions of the systems.

I get the impression that not much has been going on with Mac OS X dev builds 
for at least a few months and quite a few dependancies have changed over that 
time.  I’ll keep working on this and hopefully there are some other GIS testers 
also interested in the Macs.

Let me know if you are still trying to get the Mac OS X dev build working or if 
you have had success.

Regards,

John Harrop
jchar...@gmail.com



On Feb 8, 2018, at 10:22 PM, burghardt.scho...@stadt.wolfsburg.de wrote:

Hi John,

I believe there is no current complete dmg-file for QGIS3-dev. But you can use 
the excellent site under [1] to install QGIS3-dev using Homebrew.  
Unfortunately, there are problems with the matplotlib dependency at the moment 
(see [2]). Yersterday I've tried to install the current version but it failed.

Even so I hope that my hints help.

Regards
Burghardt


[1] https://github.com/qgis/homebrew-qgisdev/blob/master/development/README.md
[2] https://github.com/qgis/homebrew-qgisdev/issues/50

-Ursprüngliche Nachricht-
Von: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] Im Auftrag von
John Harrop
Gesendet: Donnerstag, 8. Februar 2018 19:53
An: qgis-user@lists.osgeo.org
Betreff: [Qgis-user] Mac OS X testing for QGIS 3

Hello,

Is it possible to be involved in OS X testing of the QGIS 3 beta?  There are
parts of the web site that suggest it is, but I have not been able to find a web
age for up to date downloads.

Thanks,

John Harrop
jchar...@gmail.com



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Re: [Qgis-user] vector digitizing question

[Madry, Scott]

Thank you so much, Matthias, Marian, and Stefan. 

Scott


> On Nov 9, 2017, at 9:46 AM, Matthias Kuhn <matth...@opengis.ch> wrote:
> 
> Hi Scott,
> 
> a tiny bit of configuration and it will be done for you:
> 
> https://gis.stackexchange.com/a/211154/9839
> 
> Regards
> Matthias
> 
> On 11/09/2017 03:43 PM, Madry, Scott wrote:
>> Hello all. I have a vector polygon shape file that was originally
>> created in ArcGIS. I have recently added three polygons to the file
>> using QGIS, but the results (attached) show that the area and perimeter
>> values for these are not computed. How can I, in QGIS, generate these
>> area and perimeter fields to be added? I know I can manually do the
>> areas using the ‘Measure’ tool, but would prefer an automated process.
>> Does Arc just create these automatically? Can QGIS?
>> 
>> Thanks so much,
>> 
>> Scott 
>> 
>> Scott Madry, Ph.D.
>> Research Associate Professor of Archaeology
>> The University of North Carolina at Chapel Hill
>> 
>> Tel 1-919-448-4493
>> Email:mad...@email.unc.edu <mailto:mad...@email.unc.edu>
>> https://scottmadry.web.unc.edu
>> Skype:   scott.madry
>> 
>> 
>> 
>> 
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[Qgis-user] vector digitizing question

[Madry, Scott]

Hello all. I have a vector polygon shape file that was originally created in 
ArcGIS. I have recently added three polygons to the file using QGIS, but the 
results (attached) show that the area and perimeter values for these are not 
computed. How can I, in QGIS, generate these area and perimeter fields to be 
added? I know I can manually do the areas using the ‘Measure’ tool, but would 
prefer an automated process. Does Arc just create these automatically? Can QGIS?

Thanks so much,

Scott

Scott Madry, Ph.D.
Research Associate Professor of Archaeology
The University of North Carolina at Chapel Hill

Tel 1-919-448-4493
Email:mad...@email.unc.edu
https://scottmadry.web.unc.edu
Skype:   scott.madry


[cid:61F226A1-3FF1-4A5C-92CB-6B5ACD8AA96B@earthlink.net]
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Re: [Qgis-user] Wrong result with Saga Raster calculator

[Madry, Scott]

A simple question, I hope. 

When you create a new slope map using the RASTER > TERRAIN ANALYSIS > SLOPE 
command, is the raster file created in degrees or percent slope?

Thanks,

Scott Madry
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Re: [Qgis-user] Map georeference question

[Madry, Scott]

I'll pass this to them to give a try. Thanks!


From: Werner Macho <werner.ma...@gmail.com>
Sent: Wednesday, April 12, 2017 10:24:03 AM
To: Madry, Scott
Cc: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] Map georeference question

Hi!

What about setting the "black areas" to Nodata? (or even converting
the black to real nodata values)
 Properties -> Transparency -> No data value : Insert the black value here ..

Or use the rastercalculator to get rid of the black

regards
Werner



On Wed, Apr 12, 2017 at 3:45 PM, Madry, Scott <mad...@email.unc.edu> wrote:
> Hello, QGIS gurus and friends.
>
>
> Some of my students are georeferencing historical maps in QGIS, and want to
> remove the black edge areas that appear after the raster arrays are warped,
> or at least make these and only these black areas completely transparent.
> Seems a simple task?  Thanks- Scott Madry, UNC Chapel Hill, USA
>
>
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[Qgis-user] Map georeference question

[Madry, Scott]

Hello, QGIS gurus and friends.


Some of my students are georeferencing historical maps in QGIS, and want to 
remove the black edge areas that appear after the raster arrays are warped, or 
at least make these and only these black areas completely transparent.  Seems a 
simple task?  Thanks- Scott Madry, UNC Chapel Hill, USA
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