[Qgis-user] Why does clipping a raster alters cell size? (Luciano La Sala)
Michael Treglia
mtreglia at gmail.com
Wed May 20 10:17:14 PDT 2015
Hi Luciano,
glad it worked now - the latest version is 2.8.2 ('Wien')
http://www.qgis.org/en/site/forusers/download.html
best,
mike
On Wed, May 20, 2015 at 12:11 PM, Luciano La Sala <
lucianolasala at yahoo.com.ar> wrote:
> Hola Mike,
>
> Thanks! Adding the extension myself did work! The has to be something
> wrong either with my OS or my version of QGIS. By the way, I am using the
> latest version of QGIS (2.2.0 Valmiera).
>
> Best,
>
> Luciano
>
> El 5/20/2015 a las 1:47 PM, Michael Treglia escribió:
>
>> Hi Luciano,
>>
>> I'm bringing this back to the list so others can chime in and follow
>> this thread in the future.
>>
>> Strange that the file isn't writing out with the .asc extension (it does
>> for me) - what version of QGIS are you using?
>>
>> A very simple solution: simply rename the file to add the '.asc'
>> extension. (Right click on the file name in Windows Explorer, select
>> 'Rename', and at the end of the filename simply add '.asc') - again ,
>> this should be with the Windows setting to have file extensions visible.
>>
>> Hope that helps
>> mike
>>
>>
>> On Wed, May 20, 2015 at 11:30 AM, Luciano La Sala
>> <lucianolasala at yahoo.com.ar <mailto:lucianolasala at yahoo.com.ar>> wrote:
>>
>> Hi Mike,
>>
>> Many thanks for the response. Your assumption about the content of
>> my file is correct. This seems to be the .asc file that I need. I
>> did follow your instructions and unchecked the box next to "Hide
>> extensions for known file types". Now, two of the three files show
>> their extension, namely .aux.xml and .prj. However, the suspected
>> .asc file still shows no extension. Also, when I look at the file in
>> Windows Explorer, under the detail view, there is no extension for
>> the file! Finally, when right-click on the file, go to Properties
>> and then under General >> Type of file: FILE, and under Details >>
>> Type: File. No extension whatsoever!
>>
>> I did a quick search on the web and I found that the FILE file type
>> is primarily associated with 'File With No Extension'. If you are
>> seeing the file type FILE this is not a file extension but an
>> indicator in Windows Explorer that the file has not file extension.
>> Incorrect file associations could be the result of underlying issues
>> within the PC system.
>>
>> This is very frustrating since I need those .asc files to model my
>> species distribution models using maxent.
>>
>> Ideas?
>>
>> Best,
>>
>> Luciano
>>
>>
>> El 5/20/2015 a las 12:50 PM, Michael Treglia escribió:
>>
>> Hi Luciano,
>>
>> the file that can be opened in notepad is probably has a header of
>> something like:
>> ncols
>> nrows
>> xllcorner
>> yllcorner
>> cellsize
>> NODATA_value
>>
>> Followed by the values from your raster next, right?
>>
>> If so, that is the .asc file that you want - when I export the
>> .asc file
>> (running QGIS 2.8.1 x64 on Win 7), it exports these files
>> correctly,
>> with the appropriate extension. (Though in the file Explorer, if
>> you are
>> viewing the
>>
>> On Windows [not sure about other OSs], the file extension (.asc)
>> is not
>> shown by default, for files that Windows knows how to open. To
>> change
>> this, you would go to Control Panel -> [view by icons] ->Folder
>> Options
>> -> View Tab, and un-check the box next to 'Hide extensions for
>> known
>> file types'. Also, if when you are looking at the available
>> files in
>> Windows Explorer, if you change to the detail view (which has
>> file size,
>> date modified, etc.), there should be a field "Type", for which
>> this
>> file should be specified as a "ASC" file
>>
>> Hope this helps and works for you.
>>
>> Best
>> mike
>>
>>
>> On Wed, May 20, 2015 at 10:21 AM, Luciano La Sala
>> <lucianolasala at yahoo.com.ar <mailto:lucianolasala at yahoo.com.ar>
>> <mailto:lucianolasala at yahoo.com.ar
>>
>> <mailto:lucianolasala at yahoo.com.ar>>> wrote:
>>
>> Thank you very much Nicolas for your response. I have no
>> idea how to
>> use use the -tr xres yres switch in gdalwarp.
>> However, I solved the problem using GDAL's algorithm "Clip
>> raster by
>> mask layer" and by seting the option "Keep resolution of
>> output
>> raster" to "Yes". That produced a .tif file with equal
>> pixel size
>> (200, -200).
>>
>> Following, I convert this GeoTIFF to .ASC format using:
>> "Raster >
>> Conversion > Translate (Convert format)" and the setting
>> the Output
>> file to [GDAL] Arc/Info ASCII Grid (*.asc *.ASC).
>>
>> The result is three files: the auxiliary file .aux, the
>> coordinate
>> system file .prj, and one more filename of File type FILE
>> that can
>> be opened with Notepad. Disappointingly, no .asc file was
>> created.
>> What am I doing wrong? I need .asc files of my environmental
>> variables to be later processed using other software.
>>
>> Thanks!
>>
>>
>>
>> El 5/20/2015 a las 6:02 AM,
>> qgis-user-request at lists.osgeo.org
>> <mailto:qgis-user-request at lists.osgeo.org>
>> <mailto:qgis-user-request at lists.osgeo.org
>> <mailto:qgis-user-request at lists.osgeo.org>> escribió:
>>
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>> Today's Topics:
>>
>> 1. Re: Error installing QGIS 2.8.2-1 on Mac
>> (Jacopo Tonetti)
>> 2. Draw square or line and see meters (elmalle)
>> 3. Re: Error installing QGIS 2.8.2-1 on Mac (Jes?s)
>> 4. Re: Error installing QGIS 2.8.2-1 on Mac (William
>> Kyngesburye)
>> 5. Why does clipping a raster alters cell size?
>> (Luciano La
>> Sala)
>> 6. Re: Why does clipping a raster alters cell size?
>> (Nicolas Cadieux)
>> 7. How I create web gis through Qgis (Debajyoti
>> Ghosh)
>> 8. Re: new issue with raster calculator (Bernd
>> Vogelgesang)
>> 9. Re: How I create web gis through Qgis (McDonaldR)
>>
>>
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Tue, 19 May 2015 22:23:33 +0200
>> From: Jacopo Tonetti <jacopotonetti at gmail.com
>> <mailto:jacopotonetti at gmail.com>
>> <mailto:jacopotonetti at gmail.com
>> <mailto:jacopotonetti at gmail.com>>>
>> To: Jes?s <jesusl.temez at gmail.com
>> <mailto:jesusl.temez at gmail.com> <mailto:jesusl.temez at gmail.com
>> <mailto:jesusl.temez at gmail.com>>>
>> Cc: qgis-user at lists.osgeo.org
>> <mailto:qgis-user at lists.osgeo.org>
>> <mailto:qgis-user at lists.osgeo.org
>> <mailto:qgis-user at lists.osgeo.org>>
>> Subject: Re: [Qgis-user] Error installing QGIS 2.8.2-1
>> on Mac
>> Message-ID:
>>
>>
>> <
>> CAJnh74mJHzhAJEnXJ6PmQ_UQf_n04p5OnMZONg8UJMwYREaN2Q at mail.gmail.com
>> <mailto:
>> CAJnh74mJHzhAJEnXJ6PmQ_UQf_n04p5OnMZONg8UJMwYREaN2Q at mail.gmail.com>
>>
>> <mailto:
>> CAJnh74mJHzhAJEnXJ6PmQ_UQf_n04p5OnMZONg8UJMwYREaN2Q at mail.gmail.com
>> <mailto:
>> CAJnh74mJHzhAJEnXJ6PmQ_UQf_n04p5OnMZONg8UJMwYREaN2Q at mail.gmail.com>>>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>> Hi, seems that you have an older version of PROJ
>> library. Did
>> you download
>> the package or install via homebrew? I recommend the
>> latter (but
>> you should
>> use command line), I followed this
>>
>> <
>> https://github.com/OSGeo/homebrew-osgeo4mac/wiki/Developing-on-QGIS-using-OSGeo4Mac
>> >
>> guide and everything is fine, same OS and version of
>> QGIS.
>> j
>>
>> 2015-05-19 19:38 GMT+02:00 Jes?s
>> <jesusl.temez at gmail.com <mailto:jesusl.temez at gmail.com>
>> <mailto:jesusl.temez at gmail.com
>>
>> <mailto:jesusl.temez at gmail.com>>>:
>>
>>
>> Trying to install 2.8.2-1 on a Mac (10.9.5) I find
>> this error:
>>
>> Dyld Error Message:
>> Library not loaded:
>> /Library/Frameworks/PROJ.framework/Versions/4/PROJ
>> Referenced from:
>> /Applications/QGIS.app/Contents/MacOS/QGIS
>> Reason: Incompatible library version: QGIS
>> requires
>> version 10.0.0 or
>> later, but PROJ provides version 8.0.0
>>
>> Binary Images:
>> 0x7fff6810f000 - 0x7fff68142817 dyld
>> (239.4)
>> <7AD43B9B-5CEA-3C7E-9836-A06909F9CA56> /usr/lib/dyld
>> 0x7fff8bc7f000 - 0x7fff8bc7ffff
>> com.apple.ApplicationServices (48
>> -
>> 48) <3E3F01A8-314D-378F-835E-9CC4F8820031>
>>
>>
>>
>> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Applicat
>> ionServices
>> 0x7fff8bc9f000 - 0x7fff8bd0bfff
>> com.apple.framework.IOKit (2.0.1 -
>> 907.100.14) <10932113-9F7E-38A0-A158-A019A555CAC3>
>>
>> /System/Library/Frameworks/IOKit.framework/Versions/A/IOKit
>> 0x7fff8dd59000 - 0x7fff8df3efff
>> com.apple.CoreFoundation (6.9 -
>> 855.17) <729BD6DA-1F63-3E72-A148-26F21EBF52BB>
>>
>>
>>
>> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundatio
>> n
>>
>> I delete old version first but I can't open new
>> version when
>> finishing the
>> installation. I got this message: Qgis can't be
>> open due to
>> a problem.
>>
>> Any idea? Thanks
>> Jesus
>>
>>
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>>
>>
>>
>>
>> --
>> Luciano F. La Sala
>> Consejo Nacional de Investigaciones Científicas y Técnicas
>> (CONICET)
>> Cátedra de Epidemiología
>> Departamento de Biología, Bioquímica y Farmacia
>> Universidad Nacional del Sur
>> San Juan 670
>> Bahía Blanca (8000)
>> Argentina
>> _______________________________________________
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>>
>>
>> --
>> Luciano F. La Sala
>> Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
>> Cátedra de Epidemiología
>> Departamento de Biología, Bioquímica y Farmacia
>> Universidad Nacional del Sur
>> San Juan 670
>> Bahía Blanca (8000)
>> Argentina
>>
>>
>>
> --
> Luciano F. La Sala
> Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
> Cátedra de Epidemiología
> Departamento de Biología, Bioquímica y Farmacia
> Universidad Nacional del Sur
> San Juan 670
> Bahía Blanca (8000)
> Argentina
>
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