Re: [Qgis-user] Vector with more than xyzm

[Idan Miara]

Thanks for all your replies!

On Wed, 7 Nov 2018 at 10:01, Matthias Kuhn  wrote:

> The closest you can get using a single table is using array typed fields,
> but beware of editing data, nothing will prevent you from corrupting the
> data and having geometry and attributes out of sync.
>
> Other approaches are having a separate point layer with the vertices
> duplicated or a linear referencing table.
>
> Cheers
>
> Matthias
> On 11/7/18 5:34 AM, Idan Miara wrote:
>
> Hi,
> Thanks for your response!
> Please note that the extra info is per vertex and the features are
> multipolylines for instance. Think a file of airplane paths, so you have 6
> dims per vertex and some attributes per path feature.
>
> On Wed, 7 Nov 2018, 05:34 Nicolas Cadieux  wrote:
>
>> Hi,
>>
>> Well I believe the simple .csv file is not the fastest but will give you
>> the most flexibility if you have a massive amount of data.   I have been
>> working with hyper spectral cloud data.
>>
>> Nicolas
>>
>> > Le 6 nov. 2018 à 21:09, Alex Mandel  a
>> écrit :
>> >
>> >> On 11/6/18 12:54, Idan Miara wrote:
>> >> Hi,
>> >>
>> >> What would be the OGR or the portable way for handling vector data with
>> >> more than 4 dimensions?
>> >> i.e. xyz+time+velocity+acceleration for each vertex.
>> >>
>> >> Kind regards,
>> >> Idan
>> >>
>> >>
>> >
>> > Attribute tables. Make XYZ geometries and put all your other stuff into
>> > attributes.
>> >
>> > Enjoy,
>> > Alex
>> > ___
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> --
> Matthias Kuhn
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[Qgis-user] (no subject)

[Carlos Alfonso Rojas López]

-- 
Slds,
C.A.R.L
+56 9 93594313
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Re: [Qgis-user] QGIS 3.4 macOS ...

[Saber Razmjooei]

Hi All,

We have done the Mac OS packages for LTR (3.4.1), PR(=LTR for the time
being) and Nigtly:
https://lutraconsulting.github.io/qgis-mac-packager/

It comes with all the dependencies including GDAL extras, SAGA and GRASS.
It is also a signed package, so you don't need to add security exception.

Having nightly will be a very good move, IMO. Because, Mac users usually
don't get a chance to test the software until after it is released. This
will allow us to identify the Mac related bugs in advance and fix them
before release.

Please test and file bug if required.

Cheers
Saber

On Mon, 5 Nov 2018 at 17:41, Garth Fletcher  wrote:

> Alex wrote:
> > I did discuss with Larry once about buying a Mac mini and racking it so
> > we could have a build/test machine. ...
>
> If that would solve the problem I would be happy to chip in.
> QGIS under Mac OS X 10.12 ... is important to me!
> --
> Garth Fletcher
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-- 
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www.lutraconsulting.co.uk
+44 (0)7568 129733
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Re: [Qgis-user] Manipulating DEM

[Rick Rupp]

Hi Ulli,
If the trench is narrow (in terms of pixels), you can run a smoothing filter 
over that part of the DEM. Then replace the original trench pixels with those 
from the smoothed DEM using a conditional statement (gdal_calc with a ‘where’ 
statement).
Regards, Rick


From: Qgis-user  on behalf of Ulrich 
Kriechbaum 
Sent: Thursday, November 8, 2018 5:49:12 AM
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Manipulating DEM

Dear all!

I investigate a Glacial-Lake Outburst Flood and try to back-calculate the event 
using the simulation tool r.avaflow. During the event there was a big trench 
eroded. I have a post-event DEM with a clearly visible eroded trench. What i 
want to do now is to "flatten" out the trench so that i get a pre-event DEM to 
start my simulation. What i tried to do is to create the contour lines of the 
post-event DEM, change them so that they would not show the trench and then 
create a pre-event DEM out of this contour lines. I already asked the question, 
if anyone knows how to do that, i already got some nice answers but 
unfortunately none of the inputs really work for me

So now to my actual question: Does anyone know another method how to "flatten" 
out the trench in the DEM? I would be really glad if someone would have an 
answer, as i have ben struggling a while now with these problem..

Best regards,

Ulli
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Re: [Qgis-user] Aligning georeferenced USGS historical maps

[Nicolas Cadieux]

Hi,

Answers below


On 2018-11-08 12:10 PM, Morgan Fletcher wrote:
I am new to GIS, an amateur who is curious about old roads. I have 
QGIS 3.4.0 installed on OS-X 10.13.6 using the pre-built binaries 
available from https://download.qgis.org/. If I visit the USGS 
topoView  page and download a 
historic map, for instance the geotiff archive from Tamalpais, CA 1897 
(1950 ed.) 
, I can 
add a raster layer with the .tif file from the archive and it will be 
placed in rough correspondence with a base map in my QGIS project. In 
my case my basemap is OpenStreetMap. 
(crs=EPSG:3857&format&type=xyz&url=http://a.tile.openstreetmap.org/%7Bz%7D/%7Bx%7D/%7By%7D.png&zmax=19&zmin=0) 
The problem is that the maps don't line up, visually. For example:



Screen Shot 2018-11-02 at 8.51.02 AM.png 




I can solve it better with georeferencer. Before I viewed Hans van der 
Kwast's excellent Georeferencing a scanned map and digitizing vectors 
in QGIS  video, I simply started finding 
common points; now I understand that using the correct CRS, projection 
and the grid is perhaps perhaps the best strategy.


My questions are:

  * If I download a geotiff archive from topoView, is QGIS 3.4.0
correctly parsing the data in the .tif file, or the other files
(.prj, .tfw) in the extracted directory, and placing the map
correctly? Can it be adjusted to align better, and if so, how?

The only way to do that is to use the Georeferencer and to start the job 
over.  Manually changing the tfw files (simple text file you can open 
with notepad) would require that you know what the errors are.



  * Should I use EPSG:26710 for the Tamalpais
 map,
and attempt to georeference it myself, using its minute grid? Why
does the map border show a skew at the top left and right corners?
(see below)

You should use the CRS that is closer to what your historical map is 
made from.  Generally speaking, if the map was made from ground 
surveyors using chains or sticks, I find that a local UTM is better.  
Maps in Long lat (like WGS84) are sometimes better for measurements made 
from stars.  One way to find out is to start with a simple Helmert 
transformation with two points.  It will help you see the differences 
and find the best projection.  Then, fine tune with Thin Plate Spline.  
The skew is due to the fact that local UTM coordinates (projected 
coordinate systems)  are in meters or feet and that the grid is square 
when looked at in that projection.  In Geographic Coordinate systems, 
grid is close to a rectangle.  All CRS have distortions.


  * I have found that, to get a hand-drawn, antique map to align with
a modern base map, I often have to add so many points in
georeferencer that the rendered map has to be very distorted. What
is the best method to get old maps to line up, so that historical
roads can be related to modern roads?

Find the best CRS then fine tune with Thin Plate spline.  Start by 
working far way from the area of interest then work yourself in.



Skew mentioned in second point:


Screen Shot 2018-11-08 at 8.20.56 AM.png 




I couldn't find a searchable archive of qgis-user; my apologies if 
these are already answered somewhere. I did ask a variation of these 
questions on StackExchange 
, 
where it was heavily edited by 'Vince', and has no answers after a 
week, so asking here.


Morgan


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[Qgis-user] Aligning georeferenced USGS historical maps

[Morgan Fletcher]

I am new to GIS, an amateur who is curious about old roads. I have QGIS
3.4.0 installed on OS-X 10.13.6 using the pre-built binaries available from
https://download.qgis.org/. If I visit the USGS topoView
 page and download a historic map, for
instance the geotiff archive from Tamalpais, CA 1897 (1950 ed.)
, I can add a
raster layer with the .tif file from the archive and it will be placed in
rough correspondence with a base map in my QGIS project. In my case my
basemap is OpenStreetMap. (crs=EPSG:3857&format&type=xyz&url=
http://a.tile.openstreetmap.org/%7Bz%7D/%7Bx%7D/%7By%7D.png&zmax=19&zmin=0)
The problem is that the maps don't line up, visually. For example:


 Screen Shot 2018-11-02 at 8.51.02 AM.png



I can solve it better with georeferencer. Before I viewed Hans van der
Kwast's excellent Georeferencing a scanned map and digitizing vectors in
QGIS  video, I simply started finding common
points; now I understand that using the correct CRS, projection and the
grid is perhaps perhaps the best strategy.

My questions are:


   - If I download a geotiff archive from topoView, is QGIS 3.4.0 correctly
   parsing the data in the .tif file, or the other files (.prj, .tfw) in the
   extracted directory, and placing the map correctly? Can it be adjusted to
   align better, and if so, how?
   - Should I use EPSG:26710 for the Tamalpais
    map, and
   attempt to georeference it myself, using its minute grid? Why does the map
   border show a skew at the top left and right corners? (see below)
   - I have found that, to get a hand-drawn, antique map to align with a
   modern base map, I often have to add so many points in georeferencer that
   the rendered map has to be very distorted. What is the best method to get
   old maps to line up, so that historical roads can be related to modern
   roads?

Skew mentioned in second point:


 Screen Shot 2018-11-08 at 8.20.56 AM.png



I couldn't find a searchable archive of qgis-user; my apologies if these
are already answered somewhere. I did ask a variation of these questions on
StackExchange
,
where it was heavily edited by 'Vince', and has no answers after a week, so
asking here.

Morgan
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[Qgis-user] Regression 2.18 to 3.4.1 in "Zoom to layer" and streaming raster using VRT

[Guy Doulberg]

Hi

I am a raster provider I am providing very big rasters in streaming using a
VRT file on top of many remotely GeoTiff.

Meaning I am providing a remote vrt file that is pointing to Geotifs that
can be accessed using /vsicurl/

I have created overviews as a cache layer on top of the vrt file, that can
also be accessed remotely

When opening the vrt on qgis 2.18.25 it reads only the vrt file and the ovr
file on full extent,
but when opening the vrt on the qgis 3.4.1 it reads the vrt file the
overviews and all of the geotiffs.

I debugged for a while, it seems that on 3.4.1 qgis read the overviews of
each of the geotiff when calling "Zoom to Layer"
I think that when I open the vrt file, qgis execute "Zoom to layer" and
fetches all the overviews.
After the initial opening, it seems that qgis continues as expected and
reads data only from the ovr file

When using gdalinfo on the vrt file gdal doesn't read each of geotiffs in
the VRT,  so what-else is executed when doing "zoom to layer"

I think that it is related to "Zoom to layer" because when I am in high
zoom level and go to "zoom to layer" I see in the GDAL debug it scans each
of the tiffs overviews

This thing is really important when providing a virtual raster on remote
location because it make the time it takes to see the raster on the map
much longer


I hope my case is clear cause it consist of many details

Thanks, Guy
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Re: [Qgis-user] Manipulating DEM

[Nicolas Cadieux]

Hi,

This is where a little fill-in brush tool "À la Photoshop" would be 
nice.  On a more serious note, you could  isolate the area and use a 
flood model to fill it in. Then use raster math to stick it all back 
together.  Posting a picture of you problem could help.


Nicolas


On 2018-11-08 8:49 AM, Ulrich Kriechbaum wrote:

Dear all!
I investigate a Glacial-Lake Outburst Flood and try to back-calculate 
the event using the simulation tool r.avaflow. During the event there 
was a big trench eroded. I have a post-event DEM with a clearly 
visible eroded trench. What i want to do now is to "flatten" out the 
trench so that i get a pre-event DEM to start my simulation. What i 
tried to do is to create the contour lines of the post-event DEM, 
change them so that they would not show the trench and then create a 
pre-event DEM out of this contour lines. I already asked the question, 
if anyone knows how to do that, i already got some nice answers but 
unfortunately none of the inputs really work for me
So now to my actual question: Does anyone know another method how to 
"flatten" out the trench in the DEM? I would be really glad if someone 
would have an answer, as i have ben struggling a while now with these 
problem..

Best regards,
Ulli


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Re: [Qgis-user] Manipulating DEM

[Kirk Schmidt]

Hi Ulli:

If I understand your project correctly, you only have the post DEM and 
you want to remove the new trench so that you can perform some 
additional analysis.  SO, off the top of my head, I would digitize a 
polygon whoch defines the extent of the trench.  I would use this 
polygon to erase the points derived from the contour lines and then 
create your DEM from the resulting pointg layer without elevations 
inside the trench.  You can try different techniques for creating the 
dem using the saga griding functions within the processing toolbox.  By 
using a TIN approach, the result may be a bit blocky.  If yopu try a 
B-spline interpretation, the results will be smoother, however 
individual elevations are interpreted along a spline and therefore may 
over or underestimate the actual elevations.


Hope this helps


Kirk

On 11/8/2018 9:49 AM, Ulrich Kriechbaum wrote:

Dear all!
I investigate a Glacial-Lake Outburst Flood and try to back-calculate 
the event using the simulation tool r.avaflow. During the event there 
was a big trench eroded. I have a post-event DEM with a clearly 
visible eroded trench. What i want to do now is to "flatten" out the 
trench so that i get a pre-event DEM to start my simulation. What i 
tried to do is to create the contour lines of the post-event DEM, 
change them so that they would not show the trench and then create a 
pre-event DEM out of this contour lines. I already asked the question, 
if anyone knows how to do that, i already got some nice answers but 
unfortunately none of the inputs really work for me
So now to my actual question: Does anyone know another method how to 
"flatten" out the trench in the DEM? I would be really glad if someone 
would have an answer, as i have ben struggling a while now with these 
problem..

Best regards,
Ulli

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--
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General Manager
Nortek Resource Solutions Inc.
RR # 1
Thorburn, NS
B0K 1W0
Tel (902) 922.3607
Email: k...@nortekresources.com
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Re: [Qgis-user] Manipulating DEM

[Bernd Vogelgesang]

Hi,

I do not know any alternative approach, but I would like to know what 
exactly did not work out with your "faked" DEM so far.



Cheers,

Bernd


Am 08.11.18 um 14:49 schrieb Ulrich Kriechbaum:

Dear all!
I investigate a Glacial-Lake Outburst Flood and try to back-calculate 
the event using the simulation tool r.avaflow. During the event there 
was a big trench eroded. I have a post-event DEM with a clearly 
visible eroded trench. What i want to do now is to "flatten" out the 
trench so that i get a pre-event DEM to start my simulation. What i 
tried to do is to create the contour lines of the post-event DEM, 
change them so that they would not show the trench and then create a 
pre-event DEM out of this contour lines. I already asked the question, 
if anyone knows how to do that, i already got some nice answers but 
unfortunately none of the inputs really work for me
So now to my actual question: Does anyone know another method how to 
"flatten" out the trench in the DEM? I would be really glad if someone 
would have an answer, as i have ben struggling a while now with these 
problem..

Best regards,
Ulli

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[Qgis-user] Manipulating DEM

[Ulrich Kriechbaum]

Dear all!

 

I investigate a Glacial-Lake Outburst Flood and try to back-calculate the event using the simulation tool r.avaflow. During the event there was a big trench eroded. I have a post-event DEM with a clearly visible eroded trench. What i want to do now is to "flatten" out the trench so that i get a pre-event DEM to start my simulation. What i tried to do is to create the contour lines of the post-event DEM, change them so that they would not show the trench and then create a pre-event DEM out of this contour lines. I already asked the question, if anyone knows how to do that, i already got some nice answers but unfortunately none of the inputs really work for me

 

So now to my actual question: Does anyone know another method how to "flatten" out the trench in the DEM? I would be really glad if someone would have an answer, as i have ben struggling a while now with these problem..

 

Best regards,

 

Ulli
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Re: [Qgis-user] Creating DEM from Contour lines

[Kirk Schmidt]

Hi Ulli:

 

I would try converting the contour lines to points first, then generating a 
DEM.  We use this workflow from time to time when we do not have a high quality 
DEM to work with.  

 

Kirk

 

From: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Ulrich 
Kriechbaum
Sent: Thursday, November 08, 2018 7:10 AM
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Creating DEM from Contour lines

 

Hello all!

 

I investigate a Glacial Lake Outburst Flood which eroded a lot of material. 
What i try to do is to backcalculate the event with the simulation tool 
r.avaflow. For my simulations i need a Pre-Event DEM. I have a Post-Event DEM 
where the eroded trench is clearly visible. So what i did was to project the 
Contour lines of the Post-DEM, change them so that the trench is "flattened". 
Now i try to generate a Pre-Event DEM with these Contour lines. That's the 
point at which i am struugling. I tried to interpolate the Contour lines (TIN 
and IDW) but the results were not really satisfying.

 

Does anyone have an idea how to get a nice DEM from contour lines?

 

Best regards,

 

Ulli

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[Qgis-user] Is it possible to read in mysql spatial data into qgis

[Michael . Dodd]

The data are stored in rather awkward format with circles having centre and 
radius, rectangles with two corners and polygons with point pairs in brackets 
rather than long sets of points.  Is there a utility for taking this format and 
reading into qgis so it can be converted to more standard wkt or similar?
-- The Open University is incorporated by Royal Charter (RC 000391), an exempt 
charity in England & Wales and a charity registered in Scotland (SC 038302). 
The Open University is authorised and regulated by the Financial Conduct 
Authority in relation to its secondary activity of credit broking.
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Re: [Qgis-user] Off topic Monteverdi 3.x

[Eddison Araya]

Hello thank you very much

Eddison

El jue., 8 nov. 2018 a las 4:41, Andre Joost ()
escribió:

> Am 08.11.18 um 05:23 schrieb Eddison Araya:
> > Hello! Does anyone know where to download the Monteverdi 3.x Software?
> >
> > In the following link it is indicated that a new version 3.x comes out: *
> >
> https://www.orfeo-toolbox.org/orfeo-toolbox-5-2-1-and-monteverdi-3-0-1-are-out/
> > <
> https://www.orfeo-toolbox.org/orfeo-toolbox-5-2-1-and-monteverdi-3-0-1-are-out/
> >*
> >
> > The most I have found are the following links, but I only find the
> > Monteverdi 2.x.
> >
> > Do you know where to download Monteverdi 3.x?
> >
>
> Did you visit https://www.orfeo-toolbox.org/download/ ?
>
> It seems that osgeo4w does not package current otb and monteverdi
> builds, but the binaries in the given link work.
>
> Monteverdi version numbers are now in sync with otb, and Windows
> binaries contain both.
>
> HTH,
> Andre Joost
>
>
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Re: [Qgis-user] Creating DEM from Contour lines

[Nicolas Cadieux]

Hi,

DEMs created from Contour line will have a rice paddy look with steps and flat 
areas.  If this what you are seeing?  You could smoothing filtres on the DEM or 
possible adding data point to the contour lines. Smoothing can make it nicer 
but not necessarily more accurate.  You could  perhaps make a densification of 
the contour lines,  extract the vertexes and model that in cloudcompare or Mesh 
Lab as a mesh could help.  Would help to know what is not satisfying about your 
DEM.

Nicolas

> Le 8 nov. 2018 à 06:10, Ulrich Kriechbaum  a écrit :
> 
> Hello all!
>  
> I investigate a Glacial Lake Outburst Flood which eroded a lot of material. 
> What i try to do is to backcalculate the event with the simulation tool 
> r.avaflow. For my simulations i need a Pre-Event DEM. I have a Post-Event DEM 
> where the eroded trench is clearly visible. So what i did was to project the 
> Contour lines of the Post-DEM, change them so that the trench is "flattened". 
> Now i try to generate a Pre-Event DEM with these Contour lines. That's the 
> point at which i am struugling. I tried to interpolate the Contour lines (TIN 
> and IDW) but the results were not really satisfying.
>  
> Does anyone have an idea how to get a nice DEM from contour lines?
>  
> Best regards,
>  
> Ulli
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[Qgis-user] Creating DEM from Contour lines

[Ulrich Kriechbaum]

Hello all!

 

I investigate a Glacial Lake Outburst Flood which eroded a lot of material. What i try to do is to backcalculate the event with the simulation tool r.avaflow. For my simulations i need a Pre-Event DEM. I have a Post-Event DEM where the eroded trench is clearly visible. So what i did was to project the Contour lines of the Post-DEM, change them so that the trench is "flattened". Now i try to generate a Pre-Event DEM with these Contour lines. That's the point at which i am struugling. I tried to interpolate the Contour lines (TIN and IDW) but the results were not really satisfying.

 

Does anyone have an idea how to get a nice DEM from contour lines?

 

Best regards,

 

Ulli
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Re: [Qgis-user] Off topic Monteverdi 3.x

[Andre Joost]

Am 08.11.18 um 05:23 schrieb Eddison Araya:

Hello! Does anyone know where to download the Monteverdi 3.x Software?

In the following link it is indicated that a new version 3.x comes out: *
https://www.orfeo-toolbox.org/orfeo-toolbox-5-2-1-and-monteverdi-3-0-1-are-out/
*

The most I have found are the following links, but I only find the
Monteverdi 2.x.

Do you know where to download Monteverdi 3.x?



Did you visit https://www.orfeo-toolbox.org/download/ ?

It seems that osgeo4w does not package current otb and monteverdi 
builds, but the binaries in the given link work.


Monteverdi version numbers are now in sync with otb, and Windows 
binaries contain both.


HTH,
Andre Joost


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Re: [Qgis-user] OSGEO4W64 installs after failed download

[Paolo Cavallini]

Hi Reginald,

Il 11/8/18 8:05 AM, Reginald ha scritto:
> Update
>
> I found out that the invalid download was caused by internal network
> filtering or blocking.
> Some of the applications that the installer downloads were allowed some were
> blocked.
> Do they come from other URL?

In the past some files (grass commands) were blocked because of the old
trick e.g. *.png.exe used to spread viruses.

All the best.

-- 
Paolo Cavallini - www.faunalia.eu
QGIS.ORG Chair:
http://planet.qgis.org/planet/user/28/tag/qgis%20board/

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