[Qgis-user] Nagging error when clipping with mask
Dear friends, I am using QGIS 2.18.4 Las Palmas on Windows 10 (32 bits). I need to clip raster (TIF) 1 km resolution imagery files downloaded from MODIS (http://worldgrids.org/doku.php/wiki:layers#modis_products) using a shapefile mask of Argentina. To achieve my goal, I tried to use the Clipper tool in the GDAL plugin. After doing Raster >> Extraction >> Clipper >> Clipping mode: mask layer, I get the following error message: "Output driver `AAIGrid' not recognised or does not support direct output file creation. The following format drivers are configured and support direct output: ... " followed by a list of 45 supported outputs. After a thorough online search of related problems and potential solutions, I think I have exhausted all possibilities. No matter what I do, I keep getting this anoying message. Could someone point me in the right direction please? Thank you so much. Luciano -- Dr. Luciano F. La Sala Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) Departamento de Biología, Bioquímica y Farmacia Universidad Nacional del Sur San Juan 670 Bahía Blanca (8000) Argentina --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Correct data source encoding for labels
Hello QGIS users, I am using QGIS 2.14.0 Essen. I have a shapefile for which I need to display labels. All seems ok except that accents are displayed as a question a mark inside a diamond. I understand this is a data source encoding issue. Is there a practical way to solve it? Thank you. -- Dr. Luciano F. La Sala Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) Departamento de Biología, Bioquímica y Farmacia Universidad Nacional del Sur San Juan 670 Bahía Blanca (8000) Argentina --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: http://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Too many points to cope with one simple operation?
Dear QGIS users, I am using QGIS Essen (2.14.0) on Windows 10. I have two shapefiles, one representing Argentina (single polygon) and the other one containing 97,921 points. I need to identify all the points that somehow fall outside the coutry limits and save them as a new shapefile to correct their coordinates. In doing so, I used the Spatial Query tool in the Vector option of the menue. There, under the "Select source features from" menue I select my points file, for the "Where the feature" drop-down option I select "Within", and for the "Reference features of" option, I pick my polygon file. I choose "Create new selection" and hit "Apply", but nothing happens. The operation process box shows "Processing 2/2 - 0%" and stays like that forever until I must close the program. Is this because of the large amount of points that I am having QGIS handle at once? Potential solutions will be much appreciated!!! -- Dr. Luciano F. La Sala Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) Departamento de Biología, Bioquímica y Farmacia Universidad Nacional del Sur San Juan 670 Bahía Blanca (8000) Argentina --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: http://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Why does clipping a raster alters cell size? (Luciano La Sala)
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-requ...@lists.osgeo.org escribió: Send Qgis-user mailing list submissions to qgis-user@lists.osgeo.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.osgeo.org/mailman/listinfo/qgis-user or, via email, send a message with subject or body 'help' to qgis-user-requ...@lists.osgeo.org You can reach the person managing the list at qgis-user-ow...@lists.osgeo.org When replying, please edit your Subject line so it is more specific than "Re: Contents of Qgis-user digest..." 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 To: Jes?s Cc: qgis-user@lists.osgeo.org Subject: Re: [Qgis-user] Error installing QGIS 2.8.2-1 on Mac Message-ID: 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 : 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 - 0x7fff8bc7 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 ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user -- 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 ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Why does clipping a raster alters cell size?
Dear QGIS users, I am using QGIS V 2.2.0 (OS-Windows 8), and need to prepare raster files (ESRI ArcInfo Grids) to be later used in a species distribucion model using MaxEnt. Each of the original raster files (environmental variables for Guadalquivir, Spain) has a different spatial extension (but all share the same pixel size of 200, -200). However, to be able to use these layers in MaxEnt, all of them need to have the exact same spatial extent. Therefore, I clipped every raster using a polygon of Guadalquivir. After clipping, I save as GeoTIFF but the new rasters have their original pixel size (200,-200) slightly altered (200.001,-199.942). I wouldn't bother too much about this menial difference in cell size if it weren't for the warning message that I get (see below) when trying to convert the GeoTIFF rasters to ASCII (a requirement for MaxEnt to work): Warning 1: Producing a Golden Surfer style file with DX and DY instead of CELLSIZE since the input pixels are non-square. Use the FORCE_CELLSIZE=TRUE creation option to force use of DX for even though this will be distorted. Most ASCII Grid readers (ArcGIS included) do not support the DX and DY parameters. . The Layer Spatial Reference System for Guadalquivir is: +proj=utm +zone=30 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs The Layer Spatial Reference System for the raster layers is: +proj=utm +zone=30 +ellps=GRS80 +units=m +no_defs When clipping, I'm using the function raster >> Extraction >> Clipper followed by the options... No data value = 0 Mask layer: Guadalquivir Following, I save the new raster as GeoTIFF. Questions: Should the clipping be done using a polygon with the exact same projection? I am not sure to what extent the projections differ between the layers above. In case response to question is "Yes" (same projections needed), I did the clipping using both options: first by saving Guadalquivir as .shp with the raster's projection, and later the other way around, that is saving raster files with Guadalquivir's projection. Regardless of the option, pixel size remains altered/uneven. How can I keep the original pixel size of 200,-200? Thank you in advance. Luciano ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] OpenLayers plugin error
Dear all, I am using QGIS 2.2.0 Valmiera on Windows 8. Regardless of the
version of QGIS I use, I've always had some sort of problem with python plugin
OpenLayers. With this version, I succeeded in installing the plugin but then
when I select "Plugins" >> "OpenLayers plugin" >> "Add Google Street Layer" or
"Add Google Satellite Layer", the following error pops up and I can't seem to
find a solution to this problem! Thank you in advance. Luciano
An error has occured while executing Python code: Traceback (most recent call
last): File
"C:/Users/lucianolasala/.qgis2/python/plugins\openlayers_plugin\openlayers_plugin.py",
line 50, in addLayer self.__plugin.addLayer(self) File
"C:/Users/lucianolasala/.qgis2/python/plugins\openlayers_plugin\openlayers_plugin.py",
line 204, in addLayer layer = OpenlayersLayer(self.iface,
self.__coordRSGoogle, self.olLayerTypeRegistry) File
"C:/Users/lucianolasala/.qgis2/python/plugins\openlayers_plugin\openlayers_layer.py",
line 64, in __init__ self.page = OLWebPage() File
"C:/Users/lucianolasala/.qgis2/python/plugins\openlayers_plugin\openlayers_layer.py",
line 38, in __init__ proxy = getProxy() File
"C:/Users/lucianolasala/.qgis2/python/plugins\openlayers_plugin\tools_network.py",
line 42, in getProxy proxy.setPort(settings.value("/proxyPort", 10, type=int))
TypeError: unable to convert a QVariant of type 10 to a QMetaType of type 2
Python version:
2.7.5 (default, May 15 2013, 22:44:16) [MSC v.1500 64 bit (AMD64)] QGIS version:
2.2.0-Valmiera Valmiera, c3a2817 Python path:
['C:/PROGRA~1/QGISVA~1/apps/qgis/./python/plugins\\processing',
'C:/PROGRA~1/QGISVA~1/apps/qgis/./python',
u'C:/Users/lucianolasala/.qgis2/python',
u'C:/Users/lucianolasala/.qgis2/python/plugins',
'C:/PROGRA~1/QGISVA~1/apps/qgis/./python/plugins',
'C:\\PROGRA~1\\QGISVA~1\\bin\\python27.zip',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\DLLs',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\lib',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\lib\\plat-win',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\lib\\lib-tk',
'C:\\PROGRA~1\\QGISVA~1\\bin', 'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\lib\\site-packages',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\lib\\site-packages\\PIL',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\lib\\site-packages\\win32',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\lib\\site-packages\\win32\\lib',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\lib\\site-packages\\Pythonwin',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\lib\\site-packages\\Shapely-1.2.18-py2.7-win-amd64.egg',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\lib\\site-packages\\six-1.3.0-py2.7.egg',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\lib\\site-packages\\wx-2.8-msw-unicode',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\lib\\site-packages\\xlrd-0.9.2-py2.7.egg',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\lib\\site-packages\\xlwt-0.7.5-py2.7.egg',
'C:\\PROGRA~1\\QGISVA~1\\apps\\qgis\\python\\plugins\\fTools\\tools']
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[Qgis-user] (no subject)
Dear all,
I am using QGIS 2.2.0 Valmiera on Windows 8. Regardless of the version of QGIS
I use, I've always had some sort of problem with python plugin OpenLayers. With
this version, I succeeded in installing the plugin but then when I select
"Plugins" >> "OpenLayers plugin" >> "Add Google Street Layer" or "Add Google
Satellite Layer", the following error pops up and I can't seem to find a
solution to this problem! Thank you in advance.
Luciano
An error has occured while executing Python code: Traceback (most recent call
last): File
"C:/Users/lucianolasala/.qgis2/python/plugins\openlayers_plugin\openlayers_plugin.py",
line 50, in addLayer self.__plugin.addLayer(self) File
"C:/Users/lucianolasala/.qgis2/python/plugins\openlayers_plugin\openlayers_plugin.py",
line 204, in addLayer layer = OpenlayersLayer(self.iface,
self.__coordRSGoogle, self.olLayerTypeRegistry) File
"C:/Users/lucianolasala/.qgis2/python/plugins\openlayers_plugin\openlayers_layer.py",
line 64, in __init__ self.page = OLWebPage() File
"C:/Users/lucianolasala/.qgis2/python/plugins\openlayers_plugin\openlayers_layer.py",
line 38, in __init__ proxy = getProxy() File
"C:/Users/lucianolasala/.qgis2/python/plugins\openlayers_plugin\tools_network.py",
line 42, in getProxy proxy.setPort(settings.value("/proxyPort", 10, type=int))
TypeError: unable to convert a QVariant of type 10 to a QMetaType of type 2
Python version:
2.7.5 (default, May 15 2013, 22:44:16) [MSC v.1500 64 bit (AMD64)] QGIS version:
2.2.0-Valmiera Valmiera, c3a2817 Python path:
['C:/PROGRA~1/QGISVA~1/apps/qgis/./python/plugins\\processing',
'C:/PROGRA~1/QGISVA~1/apps/qgis/./python',
u'C:/Users/lucianolasala/.qgis2/python',
u'C:/Users/lucianolasala/.qgis2/python/plugins',
'C:/PROGRA~1/QGISVA~1/apps/qgis/./python/plugins',
'C:\\PROGRA~1\\QGISVA~1\\bin\\python27.zip',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\DLLs',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\lib',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\lib\\plat-win',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\lib\\lib-tk',
'C:\\PROGRA~1\\QGISVA~1\\bin', 'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\lib\\site-packages',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\lib\\site-packages\\PIL',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\lib\\site-packages\\win32',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\lib\\site-packages\\win32\\lib',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\lib\\site-packages\\Pythonwin',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\lib\\site-packages\\Shapely-1.2.18-py2.7-win-amd64.egg',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\lib\\site-packages\\six-1.3.0-py2.7.egg',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\lib\\site-packages\\wx-2.8-msw-unicode',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\lib\\site-packages\\xlrd-0.9.2-py2.7.egg',
'C:\\PROGRA~1\\QGISVA~1\\apps\\Python27\\lib\\site-packages\\xlwt-0.7.5-py2.7.egg',
'C:\\PROGRA~1\\QGISVA~1\\apps\\qgis\\python\\plugins\\fTools\\tools']
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Re: [Qgis-user] Grid creation and export data to *.asc
Hello again…! In doing as Micha advises I came across the following cryptic warning: Cannot start module r.out.xyz. command: C:/OSGeo4W/apps/grass/GRASS-~1.2/bin/r.out.xyz.bat --interface-description 0 [main] us 0 init_cheap: VirtualAlloc pointer is null, Win32 error 487 AllocationBase 0x0, BaseAddress 0x7111, RegionSize 0x46, State 0x1 C:\OSGeo4W\apps\msys\bin\sh.exe: *** Couldn't reserve space for cygwin's heap, Win32 error 0 If I go ahead a hit “run” I get the following output: r.out.xyz 0 [main] us 0 init_cheap: VirtualAlloc pointer is null, Win32 error 487 AllocationBase 0x0, BaseAddress 0x7111, RegionSize 0x46, State 0x1 C:\OSGeo4W\apps\msys\bin\sh.exe: *** Couldn't reserve space for cygwin's heap, Win32 error 0 Finished with error I have no idea what the problem is this time. Any help will be more than welcome. Thank you very much in advance. Luciano De: Micha Silver [mailto:mi...@arava.co.il] Enviado el: Friday, December 21, 2012 2:30 PM Para: Luciano La Sala CC: qgis-user@lists.osgeo.org Asunto: Re: [Qgis-user] Grid creation and export data to *.asc Hi Luciano On 12/21/2012 5:30 PM, Luciano La Sala wrote: Hello Folks, Sorry to re-send but I got no response and I am not sure why. If my question was not clear I can always rewrite it. Luciano Hello QGIS users, I have a raster image of human population counts (LandScan) of approximately 1 km resolution. I need to take each cell of the raster one by one and retrieve the population count for that cell. To do this, I was told to create a grid theme of population density - based on the grid themes specifying population counts and area. Export population count and population density files from ArcView to *.asc files. Since your Landscan grid is at resolution 1 km, then the population count and density (per sq km) should be the same. Using the GRASS module r.out.xyz you can get an ASCII text file with three columns: X,Y,value. The X-Y are cell enters, and value would represent Population count. I am not sure how to create the grid nor how to export pop count and density files to *.asc. Any tips? Thank you in advance! Luciano La Sala This mail was received via Mail-SeCure System. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user This mail was received via Mail-SeCure System. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Grid creation and export data to *.asc
Thank you Micha! I will do as you suggest. Cheers, Luciano De: Micha Silver [mailto:mi...@arava.co.il] Enviado el: Friday, December 21, 2012 2:30 PM Para: Luciano La Sala CC: qgis-user@lists.osgeo.org Asunto: Re: [Qgis-user] Grid creation and export data to *.asc Hi Luciano On 12/21/2012 5:30 PM, Luciano La Sala wrote: Hello Folks, Sorry to re-send but I got no response and I am not sure why. If my question was not clear I can always rewrite it. Luciano Hello QGIS users, I have a raster image of human population counts (LandScan) of approximately 1 km resolution. I need to take each cell of the raster one by one and retrieve the population count for that cell. To do this, I was told to create a grid theme of population density - based on the grid themes specifying population counts and area. Export population count and population density files from ArcView to *.asc files. Since your Landscan grid is at resolution 1 km, then the population count and density (per sq km) should be the same. Using the GRASS module r.out.xyz you can get an ASCII text file with three columns: X,Y,value. The X-Y are cell enters, and value would represent Population count. I am not sure how to create the grid nor how to export pop count and density files to *.asc. Any tips? Thank you in advance! Luciano La Sala This mail was received via Mail-SeCure System. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user This mail was received via Mail-SeCure System. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Grid creation and export data to *.asc
Hello Folks, Sorry to re-send but I got no response and I am not sure why. If my question was not clear I can always rewrite it. Luciano Hello QGIS users, I have a raster image of human population counts (LandScan) of approximately 1 km resolution. I need to take each cell of the raster one by one and retrieve the population count for that cell. To do this, I was told to create a grid theme of population density - based on the grid themes specifying population counts and area. Export population count and population density files from ArcView to *.asc files. I am not sure how to create the grid nor how to export pop count and density files to *.asc. Any tips? Thank you in advance! Luciano La Sala ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Grid creation and export data to *.asc
Hello QGIS users, I have a raster image of human population counts (LandScan) of approximately 1 km resolution. I need to take each cell of the raster one by one and retrieve the population count for that cell. To do this, I was told to create a grid theme of population density - based on the grid themes specifying population counts and area. Export population count and population density files from ArcView to *.asc files. I am not sure how to create the grid nor how to export pop count and density files to *.asc. Any tips? Thank you in advance! Luciano La Sala ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] [Bulk] Re: LandScan data
Thank you Alexander!! It was simpler than I thought, as usual. Luciano -Mensaje original- De: Alexander Bruy [mailto:alexander.b...@gmail.com] Enviado el: Wednesday, November 14, 2012 1:14 PM Para: Luciano La Sala CC: qgis-user@lists.osgeo.org Asunto: [Bulk] Re: [Qgis-user] LandScan data Set contrast enhancement to StretchToMinMax and select std. dev value bigger than 0. Both options are available in layer properties dialog On Wed, 14 Nov 2012 13:15:19 -0300 "Luciano La Sala" wrote: > However, I could only import grey raster maps of Haiti into QGIS, so > far from what it should look like! Has anyone worked with these type > of data before? If so, any tips on how to proceed? Is there a python > plug-in that replaces LandScan Tools as thay are implemented in ArcMap? -- Alexander Bruy ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] LandScan data
Hello QGIS users, I am trying to work with LandScan data in QGIS V. 1.8.0. to estimate population at risk in areas of Argentina. I download the sample data file for Haiti to explore how to import and process the data. The LandScan 2011 Global Population Database comes in the following formats: 1. Raster GIS: ESRI Grid format. [Note: the Spatial Analyst extension for ArcGIS or ArcView (3.x) is required for analyzing the LandScan data.] 2. HPAC Binary: Hazard Prediction Assessment Capability compressed binary format. 3. Binary raster: ESRI binary raster format (see included documentation). Almost any high level programming language can read this file directly. This is the kind of data you get after downloading the sample dataset, which presently includes data for Cyprus, available for download at http://www.ornl.gov/sci/landscan/landscan_sample.shtml This is what a raster LandScan map should look like: http://www.ornl.gov/sci/landscan/images/Cyprus_Image.png However, I could only import grey raster maps of Haiti into QGIS, so far from what it should look like! Has anyone worked with these type of data before? If so, any tips on how to proceed? Is there a python plug-in that replaces LandScan Tools as thay are implemented in ArcMap? Cheers, Luciano La Sala ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] LandScan data
Hello! I have the LandScan 2002 Global Population Database at 30 arc seconds but I am not sure about its format; either "Raster GIS: ESRI Grid format" or "Binary raster: ESRI binary raster format". I need to extract and process only data for Argentina, but I feel like I've been beating a dead horse for days now! Is there a straightforward way to do this? Thank you in advance! Luciano ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Kernel smoothing
Hi all, I am using QGIS 1.8.0 on Windows 7. Using GRASS, I transformed several shapefiles (all polygons) into raster maps, then I assigned certain values of interest to the pixels, and finally combined all five rasters into one using GRASS raster map calculator. Now I need to apply a kernel smoothing to the raster for easier interpretation of the thematic map, which is a risk map with different colors according different risk estimate for that cell (pixel value). How do I perform kernel smoothin on this raster from QGIS? Is there a specific python plug-in for this? I read something about "Point sampling tool plugin for QGIS" but I just can't seem to get it installed. Here I shale the link to a brief note I found on "How to sample raster datasets using points in QGIS", but as I said there seems to be no plug-in to be installed! Very weird. http://www.gistutor.com/quantum-gis/19-beginner-quantum-gis-tutorials/54-how -to-sample-raster-datasets-using-points-in-quantum-gis-qgis.html Thank you in advance. Luciano ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Same layer extent?
Hola! I am using GRASS inside QGIS and I need to perform some very basic arithmetic on raster map layers using "r.mapcalc". Once I have created my mapset in GRASS and imported all three rasters into GRASS from QGIS view, I define my algorithm by simply doing "Raster_A + Raster_B + Raster_C". However, the output gives the message "Unable to open raster map. Finished with error". I am not sure what the problema is, but I suspect that it may be related to the extent of each layer, which is different for each raster: Raster_A Layer Extent (layer original source projection): -264465.642805104122,3892490.3601970002055168: 1442088.185180295043,7588100.0655570002272725 Raster_B Layer Extent (layer original source projection): -231150.303056042897,3942814.959309562370: 1421853.422191778735,7568606.9837530003860593 Raster_C Layer Extent (layer original source projection): -302992.657880133924,3856086.4785620002076030: 1162350.090444798089,7559207.0393540002405643 Q1: What do these long numbers represent? Q2: Should every raster layer have the exact same layer extent for the mathematical calculation to come out right? Thank you so much in advance! Luciano ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Rasterize vector
Dear QGIS experts, I am using QGIS V. 1.8.0. and I have a shapefile of Argentina which I need to convert to raster. I looks as a pretty straightforward process, but along the way I hit the following problem: 1) Once the vector file is loaded, I go to Raster >> Conversion >> Rasterize (Vector to raster) 2) I select the output file but the following message pops up: "The output file doesn't exist. You must set up the output size to create it." 3) I hit Ok and then I am left to decide what size do I want for the output file. The default values are Width = 3000 and Height = 3000. So at this point my questions are: a) What are these values for width and height? What do they represent? After conversion, I load the raster and under properties and metadata tab it says that dimensions of raster are X: 3000 Y: 3000 Bands: 1, but I am not sure what this means. Thank you in advance for your help. Luciano ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] First time here
Estimado Carlos! Muchas gracias por tu ayuda! Creo que me será muy útil para lograr mi objetivo. Un cordial abrazo desde Argentina! Luciano -Mensaje original- De: Carlos Cerdán [mailto:sig.up...@gmail.com] Enviado el: Sunday, September 30, 2012 8:04 PM Para: qgis-user@lists.osgeo.org CC: Luciano La Sala Asunto: Re: [Qgis-user] First time here Hola Luciano: Mi Inglés no es bueno, así que con (o sin) el permiso del foro van estas líneas en español: Bienvenido a QGIS!! Tengo a la mano un par tutoriales que preparé para unas prácticas con GRASS bajo QGIS 1.8 que creo te serán útiles. Tutorial 1 : https://docs.google.com/open?id=0B7OCKS4ZyCTARTJNY3h6RWFYcFk Tutorial 2 : https://docs.google.com/open?id=0B7OCKS4ZyCTAODFOSGd5cXRqNzQ En GRASS hay dos módulos que se ajustan a tus necesidades: v.to.rast.const : convertir vectorial a raster usando una constante v.to.rast.attr : convertir vectorial a raster usando valores de su tabla de atributos Además la calculadora gráfica de GRASS también te será muy útil. Saludos desde Cajamarca - Perú My English is not good, so with (or without) the permission of the forum the above lines in Spanish: Wellcome to QGIS!! I have a couple of tutorials that I made for practices with GRASS under QGIS 1.8 that I think it will be useful for you Tutorial 1 : https://docs.google.com/open?id=0B7OCKS4ZyCTARTJNY3h6RWFYcFk Tutorial 2 : https://docs.google.com/open?id=0B7OCKS4ZyCTAODFOSGd5cXRqNzQ GRASS have two tools that are for your request: v.to.rast.const v.to.rast.attr Graphical calculator will be also useful for you. Cheers from Cajamarca - Perú El 29/09/12 15:16, Luciano La Sala escribió: > Hello QGIS users! > > My name is Luciano and I am a wildlife researcher from Argentina. I am > rather new to the world of QGIS, so I apologize in advance for any > rather basic question. > > I have several shapefiles of Argentina which I am supposed to use to > make a risk map. These vector files include: > > 1- Country border (line) > 2- Airports (points) > 3- Rivers (lines) > 4- Wetlands (polygons) > 5- Roads (lines) > 6- Poultry farms (points) > > I rasterized each of the vector files and gave each the same, new size > (3993 hight and 2393 width) to fit the entire country. > > Then, on each of the six maps, cells should be made to take a value of > 1 if risk factor is present (road, city, airport, wetland, and so on) > and 0 otherwise. All the rasters should then be combined into one > unified map. It is my understanding that this unified map can be made > using different approaches (e.g. addition, addition and weighting, pair-wise comparisons). > In ArcView 3.2 this is done with "map calculator" of the "spatial analysis" > extension. These procedures would give a map in raster format where > color intensity of the cells is associated with the risk present in the area. > Finally, one can apply a kernel smoothing to ease interpretation of the map. > > > So at this point my questions are: > > 1) How do I assign values of 0 or 1 to pixels on each raster image? I > believe I could use RasterCalc plugin, but I just can't find a way > around this. > > 2) Once the above step is solved, how do I combine all maps into one > using one of the mentioned procedures (e.g. addition)? > > Thank you in advance. > > Luciano La Sala > Centro de Estudios Cuantitativos en Sanidad Animal (CECSA) - CONICET > Facultad de Ciencias Veterinarias - Casilda Universidad Nacional de > Rosario Argentina > > ___________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/qgis-user El 29/09/12 15:16, Luciano La Sala escribió: > Hello QGIS users! > > My name is Luciano and I am a wildlife researcher from Argentina. I am > rather new to the world of QGIS, so I apologize in advance for any > rather basic question. > > I have several shapefiles of Argentina which I am supposed to use to > make a risk map. These vector files include: > > 1- Country border (line) > 2- Airports (points) > 3- Rivers (lines) > 4- Wetlands (polygons) > 5- Roads (lines) > 6- Poultry farms (points) > > I rasterized each of the vector files and gave each the same, new size > (3993 hight and 2393 width) to fit the entire country. > > Then, on each of the six maps, cells should be made to take a value of > 1 if risk factor is present (road, city, airport, wetland, and so on) > and 0 otherwise. All the rasters should then be combined into one > unified map. It is my understanding that this unified map can be made > using different approaches (e.g. addition, addition and weighting, pair-wise comparisons). > In ArcView 3.2 this is done
Re: [Qgis-user] [Bulk] Qgis-user Digest, Vol 79, Issue 77
Dear Micha and Paolo, I am carefully reading your responses to find a way around this problem asap. Thanks again! Luciano ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] First time here
Hello QGIS users! My name is Luciano and I am a wildlife researcher from Argentina. I am rather new to the world of QGIS, so I apologize in advance for any rather basic question. I have several shapefiles of Argentina which I am supposed to use to make a risk map. These vector files include: 1- Country border (line) 2- Airports (points) 3- Rivers (lines) 4- Wetlands (polygons) 5- Roads (lines) 6- Poultry farms (points) I rasterized each of the vector files and gave each the same, new size (3993 hight and 2393 width) to fit the entire country. Then, on each of the six maps, cells should be made to take a value of 1 if risk factor is present (road, city, airport, wetland, and so on) and 0 otherwise. All the rasters should then be combined into one unified map. It is my understanding that this unified map can be made using different approaches (e.g. addition, addition and weighting, pair-wise comparisons). In ArcView 3.2 this is done with "map calculator" of the "spatial analysis" extension. These procedures would give a map in raster format where color intensity of the cells is associated with the risk present in the area. Finally, one can apply a kernel smoothing to ease interpretation of the map. So at this point my questions are: 1) How do I assign values of 0 or 1 to pixels on each raster image? I believe I could use RasterCalc plugin, but I just can't find a way around this. 2) Once the above step is solved, how do I combine all maps into one using one of the mentioned procedures (e.g. addition)? Thank you in advance. Luciano La Sala Centro de Estudios Cuantitativos en Sanidad Animal (CECSA) - CONICET Facultad de Ciencias Veterinarias - Casilda Universidad Nacional de Rosario Argentina ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
