Re: [Qgis-user] Who is in charge of qgisforum.org ?

[Alex Mandel]

Whois says:
Roi Hojgaard
Hovedstaden - Copenhagen

I'll note, QGIS used to have a forum. PSC retired it in favor of
http://gis.stackexchange.com/

There was a constant debate, since many QGIS experts were only on the
mailing lists (and wanted to stay there) and not the forums.

-Alex

On 12/30/2015 01:23 AM, Luigi Pirelli wrote:
> I remember amds where guys from Denmark and Faroe islands... I agree,
> as forum it is used but site is old and the blog seems heavily
> hacked.
> 
> cheers
> 
> Luigi Pirelli
> 
> **
> * Boundless QGIS Support/Development: lpirelli AT boundlessgeo DOT com
> * LinkedIn: https://www.linkedin.com/in/luigipirelli
> * Stackexchange: http://gis.stackexchange.com/users/19667/luigi-pirelli
> * GitHub: https://github.com/luipir
> * Mastering QGIS:
> https://www.packtpub.com/application-development/mastering-qgis
> **
> 
> 
> On 30 December 2015 at 10:13, Lene Fischer  wrote:
>> Hi
>>
>> I just found this http://www.qgisforum.org
>>
>> A very nice page – bud sadly with a very few answers.
>>
>>
>>
>> I think that if you set up a forum, you also have the responsibility to keep
>> it updated.
>>
>>
>>
>> Regards
>>
>> Lene Fischer
>>

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Re: [Qgis-user] Exporting png or pdf from print composer does not work, empties canvas (Lyon)

[Joris Hintjens]

In my experience, it can be due to bad network. When rendering the pdf, QGIS 
will download the needed layers again. When the connection to the servers of 
online map-sources fail, result will be a blank layer or missing tiles. 

Joris

> Op 30 dec. 2015, om 20:48 heeft Richard Males  het 
> volgende geschreven:
> 
> Sorry, previously posted response under wrong subject:
> 
> Thank you.   I have been doing some additional testing, it appears to
> relate to having a few maps on the canvas that use the Open Street Map
> underlay.  The behavior is pretty much as noted in the referenced issue. 
> 
> Even with a single OSM underlay, while I do get an export, the
> underlay is not complete, i.e. jagged edges where some tiles are missing in
> the exported png, even though they do appear on the map. 
> 
> I will try QuickMapServices.plugin.
> 
> Thanks.
> 
> Dick
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Re: [Qgis-user] Exporting png or pdf from print composer does not work, empties canvas (Lyon)

[Richard Males]

Sorry, previously posted response under wrong subject:

Thank you.   I have been doing some additional testing, it appears to
relate to having a few maps on the canvas that use the Open Street Map
underlay.  The behavior is pretty much as noted in the referenced issue.

Even with a single OSM underlay, while I do get an export, the
underlay is not complete, i.e. jagged edges where some tiles are missing in
the exported png, even though they do appear on the map.

I will try QuickMapServices.plugin.

Thanks.

Dick
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Re: [Qgis-user] Error Trying to Run R Summary Statistics in QGIS 2.12.1

[Terry Morse]

The answer turns out to be that, while QGIS can extract and process layers from 
a zipfile, the R scripts can't. Once I extracted the layers and added them to 
QGIS, the R scripts worked.

Terry

-Original Message-
>From: Terry Morse 
>Sent: Dec 27, 2015 10:21 PM
>To: QGIS-L 
>Subject: [Qgis-user] Error Trying to Run R Summary Statistics in QGIS 2.12.1
>
>When I try to run the R script "Summary statistics" in QGIS 2.12.1 on a 
>Windows 7/64 bit machine, I get the error message "error in if 
>(!file.info(DSN)$isdir) DSN missing value where TRUE/FALSE needed," and the 
>output file is empty. (The results viewer opens, but all it contains is the 
>heading, "R Output".)
>
>Having read a comment on-line that R doesn't work properly if installed in the 
>c:\Program Files\ directory, I tried installing it in its own directory in c:, 
>but that didn't make any difference. I've tried installing R with and without 
>the 32 bit files, and with just the 32 bit files (no 64 bit files), but the 
>result is always the same: no results. The same happens with the R Histogram 
>script.
>
>QGIS's native Basic Statistics routine does produce results, so I don't think 
>there is any problem with the line vector shapefile. As for the R options, I 
>have checked "Activate" and "Use 64-bit version" (I've tried it with this 
>unchecked as well.
>
>The R-scripts folder is "C:\Users\Terry\.qgis2\processing\rscripts";
>the R folder is "C:\Program Files\R\R-3.2.3";
>and the R user library folder is "C:\Users\Terry\.qgis2\processing\rlibs."
>
>Can anyone help me get R scripts working in QGIS?
>
>Thank you,
>Terry
>
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Re: [Qgis-user] Problem managing data

[Matt Boyd]

I've done something like this in the distant past.
Put data into a postgis database.
Link excel to the database.

That's the basics, there are a few details I don't have time to dig out at
the moment. If you haven't figured it out in a couple of weeks when I'm
back at my desk let me know and I'll see what I can put together.

Matt
On 28 Dec 2015 10:36 pm, "Siki Zoltan"  wrote:

> Dear Eva,
>
> AFAIK there is no direct solution to edit ods/xls/xlsx files from QGIS.
> There are two possible scenarios:
> 1. Edit your speadseet data in Libre|Open|MS office and open it in QGIS
> and join it to your spatial data. If your spreadsheet is open in both QGIS
> and Excel it can cause trouble.
>
> 2. Open you spreadsheet in QGIS and save as a QGIS editable format (e.g.
> dbf, sqlite) and edit these data. If you need again these data in a
> spreadsheet convert it back (probably through csv format).
>
> Hope it helps you,
>
> Zoltan
>
> On Mon, 28 Dec 2015, Eva Mosquera wrote:
>
> Hello everybody!I need to use the data I have in my shpfile in qgis in
>> excel. I need an excel spreadsheet that is able by itself to keep updated
>> with the data changes in qgis. And I don't know how to do this.
>> I'm trying to import the database (dbf) in excel but I have problems with
>> the type and characteristics...
>> Thank you very much
>>
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[Qgis-user] Who is in charge of qgisforum.org ?

[Lene Fischer]

Hi
I just found this http://www.qgisforum.org
A very nice page – bud sadly with a very few answers.

I think that if you set up a forum, you also have the responsibility to keep it 
updated.

Regards
Lene Fischer
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Re: [Qgis-user] Who is in charge of qgisforum.org ?

[Luigi Pirelli]

I remember amds where guys from Denmark and Faroe islands... I agree,
as forum it is used but site is old and the blog seems heavily
hacked.

cheers

Luigi Pirelli

**
* Boundless QGIS Support/Development: lpirelli AT boundlessgeo DOT com
* LinkedIn: https://www.linkedin.com/in/luigipirelli
* Stackexchange: http://gis.stackexchange.com/users/19667/luigi-pirelli
* GitHub: https://github.com/luipir
* Mastering QGIS:
https://www.packtpub.com/application-development/mastering-qgis
**


On 30 December 2015 at 10:13, Lene Fischer  wrote:
> Hi
>
> I just found this http://www.qgisforum.org
>
> A very nice page – bud sadly with a very few answers.
>
>
>
> I think that if you set up a forum, you also have the responsibility to keep
> it updated.
>
>
>
> Regards
>
> Lene Fischer
>
>
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Re: [Qgis-user] Qgis-user Digest, Vol 118, Issue 49

[Richard Males]

Thank you.   I have been doing some additional testing, it appears to
relate to having a few maps on the canvas that use the Open Street Map
underlay.  Even with a single OSM underlay, while I do get an export, the
underlay is not complete, i.e. jagged edges where some tiles are missing in
the exported png, even though they do appear on the map.

Dick

On Tue, Dec 29, 2015 at 3:00 PM,  wrote:

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> than "Re: Contents of Qgis-user digest..."
>
>
> Today's Topics:
>
>1. Re: 1928-1930 USGS maps (Jan Becket)
>2. Re: 1928-1930 USGS maps (William Kyngesburye)
>3. Re: Exporting png or pdf from print composer does not work,
>   empties canvas (Lyon) (Anita Graser)
>
>
> --
>
> Message: 1
> Date: Mon, 28 Dec 2015 12:12:34 -1000
> From: Jan Becket 
> To: William Kyngesburye 
> Cc: qgis-user@lists.osgeo.org
> Subject: Re: [Qgis-user] 1928-1930 USGS maps
> Message-ID: <0f0fcd6b-db74-4705-ae55-5154da9a5...@gmail.com>
> Content-Type: text/plain; charset=utf-8
>
> With your suggestions and those of Nicolas I was able to make the maps
> appear. I trashed the copies I had altered in Photoshop, loaded the
> original (black) images, set the min as 0 and the max as 1 and then
> stretched to min/max. That turned out to be easy. Thanks for the help!
>
> - Jan
>
>
> > On Dec 28, 2015, at 4:42 AM, William Kyngesburye 
> wrote:
> >
> > Or, QGIS should be able to read 16bit greyscale images without breaking
> them with Photoshop.  You just need to set a min and max to include the
> 16bit range and stretch the contrast to minmax.  Make sure you are not
> using QGIS 2.10 - that had a broken raster styling on OS X.
> >
> > Alternately, use GDAL to convert to 8bit, not Photoshop.
> "gdal_translate -scale -ot Byte" should do it (in Terminal, I don't see the
> -scale or -ot options in QGIS GDAL convert format).
> >
> >> On Dec 28, 2015, at 12:53 AM, Nicolas Cadieux <
> nicolas.cadi...@archeotec.ca> wrote:
> >>
> >> Hi,
> >> You are correct, you have stripes the CRS info from the map because
> Photoshop does not know what to do. If you load the map, you can click on
> raster.. Something... Gdal-info.  That should give you all the tagged info
> left in the image.
> >>
> >> Load the map in QGIS and click on "zoom to layer extent".  If you still
> don't see it, make sure you are in a CRS that is projected in meters.  You
> should be able to see it.  The map should be at 0,0.
> >>
> >> All is not loss...  You can reproject the map to the correct CRS using
> the gdal georeferencing tool.Always back up your data before
> manipulating it.
> >> Hope this helps!
> >>
> >> Nicolas Cadieux M.Sc.
> >> Les Entreprises Archéotec inc.
> >> 8548, rue Saint-Denis Montréal H2P 2H2
> >> Téléphone: 514.381.5112  Fax: 514.381.4995
> >> www.archeotec.ca
> >>
> >> On Dec 28, 2015 01:16, "Jan Becket [via OSGeo.org]" <[hidden email]>
> wrote:
> >> After much effort, I obtained an old set of 1928-1930 USGS topo maps of
> Oʻahu Island, Hawaiʻi - for a project I am working on. The maps are without
> collars and used by a local archaeological firm. The geotiff maps at first
> showed as completely black on my Mac system (10.10.5 - Yosemite). However I
> found this link with a resultuion for the issue:
> >>
> >>
> http://stackoverflow.com/questions/13925995/options-to-convert-16-bit-image
> >>
> >> I opened the 16 quads for Oʻahu in Photoshop and applied auto levels,
> after which they became discernable quad maps. However, when imported into
> QGIS, they are now invisible. I wonder if it is possible that I stripped
> away the geotiff CRS information. Prior to the Photoshop operation, the
> maps did appear correctly referenced to Oʻahu Island (although they were
> totally opaque / black).
> >>
> >> Now, the maps in QGIS are not visible, although the geotiffs are
> several megabytes in size and are visible when opened in Photoshop,
> Preview, or whatever image viewer.
> >>
> >> I should mention that I have successfully imported other sets of USGS
> maps of Oʻahu for this project - the 1902 series, the 1916 series, the 1935
> series - as well as the current series. The early maps used the Old
> Hawaiian CRS (EPSG 3564) but more modern maps use WGS83, Zone 4N (EPSG
> 3711). I have on the fly projection enabled and have tried many CRS
> settings for the maps, but nothing results in a visible quad appearing.
> >>
> >> 

[Qgis-user] Georeferencing old areal photography

[James Keener]

Hello!

I have many scans of old slides from areal photography from 30s/40s,
50s/60s, and 60s/70s. Being interested in rail lines, I (and I was going
to trick^Wask my dad and brother to help) trace out the rail lines found
in each areal photograph, with the goal being to align our traces with
current routes in order to georeference the old scans. While some of the
right-of-way has changed since those times, those cases should be small
enough that they can be handled by hand afterwards.

I realize that not all of these scans are in the exact same orientation,
scale, and skew and will need to use something like pHash (or anything
suggested!) to attempt to find overlap. Part of what I'm trying to
figure out right now is how to do the overlap with the GIS files since
phash would only work if I tile my maps of current lines.

Tiles that don't contain rail lines can be handled at a later date,
perhaps with a similar system attempting to align local roads or via
self-similarity with other tiles since they often overlap a little.

Any thoughts, suggestions, ideas, and advice would be greatly appreciated!

Thank you!
Jim
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