Re: [Qgis-user] Using/visualizing 3D data (Z values)
Thanks for your response. I am sure that it is there, but when I try to import pyqt or pyqt4 I get the standard message about the module not existing. This is the case both in a normal shell or in the QGIS Python window. For visvis, when I try app = vv.use(), the backend is not detected. David. On Wed, Oct 17, 2012 at 12:55 AM, gene martin.lal...@gmail.com wrote: PyQt4 is present in the QGIS versions of William to be used in the Python console, so, automatically you have a backend. -- View this message in context: http://osgeo-org.1560.n6.nabble.com/Using-visualizing-3D-data-Z-values-tp4126375p5009181.html Sent from the Quantum GIS - User mailing list archive at Nabble.com. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Using/visualizing 3D data (Z values)
it is a problem of PATH *1) in the shell:* If you read the Read Me.rtf accompanying QGIS, the procedure is specified: /The PyQt programs are included to compile UI and resource files for plugins. To use them, set these in your shell environment (you can add it to your ~/.bash_profile if you like): export PATH=/Applications/QGIS.app/Contents/MacOS/bin:$PATH export PYTHONPATH=/Applications/QGIS.app/Contents/Resources/python If you already have something in PYTHONPATH, add it instead with: export PYTHONPATH=/Applications/QGIS.app/Contents/Resources/python:$PYTHONPATH Note that QGIS.app MUST be installed in /Applications and must not be renamed for pyuic4 to work (it has a hardcoded path in it)./ After that, you can use PyQt4 in the shell import PyQt4 PyQt4.__file__ '/Applications/QGIS.app/Contents/MacOS/../Resources/python/PyQt4/__init__.pyc' *2) In the console of QGIS*, This is not normal because the console itself is written in PyQt4 1) with QGIS 1.8 import PyQt4: PyQt4.__file__ '/Applications/*QGIS.app*/Contents/MacOS/../Resources/python/PyQt4/__init__.pyc' 2) with QGIS dev: import PyQt4 PyQt4.__file__ '/Applications/*QGIS_2.0-dev_SnoLeo.app*/Contents/MacOS/../Resources/python/PyQt4/__init__.pyc' -- View this message in context: http://osgeo-org.1560.n6.nabble.com/Using-visualizing-3D-data-Z-values-tp4126375p5009339.html Sent from the Quantum GIS - User mailing list archive at Nabble.com. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Using/visualizing 3D data (Z values)
Thank you very much for your help. Indeed, it was the PATH/PYTHONPATH issue. I think that when I installed QGIS last time, I was in a rush and didn't think that I would need the Python support. I decided to reinstall QGIS and then I found the same README. I am excited to play with visvis. David. On Wed, Oct 17, 2012 at 10:12 AM, gene martin.lal...@gmail.com wrote: it is a problem of PATH *1) in the shell:* If you read the Read Me.rtf accompanying QGIS, the procedure is specified: /The PyQt programs are included to compile UI and resource files for plugins. To use them, set these in your shell environment (you can add it to your ~/.bash_profile if you like): export PATH=/Applications/QGIS.app/Contents/MacOS/bin:$PATH export PYTHONPATH=/Applications/QGIS.app/Contents/Resources/python If you already have something in PYTHONPATH, add it instead with: export PYTHONPATH=/Applications/QGIS.app/Contents/Resources/python:$PYTHONPATH Note that QGIS.app MUST be installed in /Applications and must not be renamed for pyuic4 to work (it has a hardcoded path in it)./ After that, you can use PyQt4 in the shell import PyQt4 PyQt4.__file__ '/Applications/QGIS.app/Contents/MacOS/../Resources/python/PyQt4/__init__.pyc' *2) In the console of QGIS*, This is not normal because the console itself is written in PyQt4 1) with QGIS 1.8 import PyQt4: PyQt4.__file__ '/Applications/*QGIS.app*/Contents/MacOS/../Resources/python/PyQt4/__init__.pyc' 2) with QGIS dev: import PyQt4 PyQt4.__file__ '/Applications/*QGIS_2.0-dev_SnoLeo.app*/Contents/MacOS/../Resources/python/PyQt4/__init__.pyc' -- View this message in context: http://osgeo-org.1560.n6.nabble.com/Using-visualizing-3D-data-Z-values-tp4126375p5009339.html Sent from the Quantum GIS - User mailing list archive at Nabble.com. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Using/visualizing 3D data (Z values)
Waiting for Globe, a solution to extract the z values of 3D shapefiles is to use ogr or shapely (see in qgis-developer http://osgeo-org.1560.n6.nabble.com/Re-Qgis-user-Using-visualizing-3D-data-Z-values-td5004272.html http://osgeo-org.1560.n6.nabble.com/Re-Qgis-user-Using-visualizing-3D-data-Z-values-td5004272.html , http://osgeo-org.1560.n6.nabble.com/visualizing-3D-data-Z-values-or-data-with-z-attribute-a-solution-td5005360.html http://osgeo-org.1560.n6.nabble.com/visualizing-3D-data-Z-values-or-data-with-z-attribute-a-solution-td5005360.html ). After you can use matplotlib or other Python modules like * Visvis http://code.google.com/p/visvis/ * to visualize the data in 3D: http://osgeo-org.1560.n6.nabble.com/file/n5009086/qgisvisvissurfbok.png (see also, with http://code.google.com/p/visvis/wiki/Screenshots http://code.google.com/p/visvis/wiki/Screenshots ) This solution also applies to layers with z attribute. The full explanation of the processing is given, in French, at QGIS, représentation 3D des couches vectorielles (shapefiles dits 3D ou shapefiles avec attributs z) avec avec les modules Python Matplotlib ou Visvis à partir de la console Python http://www.portailsig.org/content/qgis-representation-3d-des-couches-vectorielles-shapefiles-dits-3d-ou-shapefiles-avec-attrib -- View this message in context: http://osgeo-org.1560.n6.nabble.com/Using-visualizing-3D-data-Z-values-tp4126375p5009086.html Sent from the Quantum GIS - User mailing list archive at Nabble.com. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Using/visualizing 3D data (Z values)
Gene, Your email and posts got me inspired to install visvis. I am running Qgis 1.8 on OSX using William's installers at kyngchaos.com. By default, I don't have a GUI toolkit installed for the backend. Does anyone have any suggestions on the best way to get one installed without conflicting with QGIS or other applications? Thanks, David. On Tue, Oct 16, 2012 at 12:27 PM, gene martin.lal...@gmail.com wrote: Waiting for Globe, a solution to extract the z values of 3D shapefiles is to use ogr or shapely (see in qgis-developer http://osgeo-org.1560.n6.nabble.com/Re-Qgis-user-Using-visualizing-3D-data-Z-values-td5004272.html http://osgeo-org.1560.n6.nabble.com/Re-Qgis-user-Using-visualizing-3D-data-Z-values-td5004272.html , http://osgeo-org.1560.n6.nabble.com/visualizing-3D-data-Z-values-or-data-with-z-attribute-a-solution-td5005360.html http://osgeo-org.1560.n6.nabble.com/visualizing-3D-data-Z-values-or-data-with-z-attribute-a-solution-td5005360.html ). After you can use matplotlib or other Python modules like * Visvis http://code.google.com/p/visvis/ * to visualize the data in 3D: http://osgeo-org.1560.n6.nabble.com/file/n5009086/qgisvisvissurfbok.png (see also, with http://code.google.com/p/visvis/wiki/Screenshots http://code.google.com/p/visvis/wiki/Screenshots ) This solution also applies to layers with z attribute. The full explanation of the processing is given, in French, at QGIS, représentation 3D des couches vectorielles (shapefiles dits 3D ou shapefiles avec attributs z) avec avec les modules Python Matplotlib ou Visvis à partir de la console Python http://www.portailsig.org/content/qgis-representation-3d-des-couches-vectorielles-shapefiles-dits-3d-ou-shapefiles-avec-attrib -- View this message in context: http://osgeo-org.1560.n6.nabble.com/Using-visualizing-3D-data-Z-values-tp4126375p5009086.html Sent from the Quantum GIS - User mailing list archive at Nabble.com. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Using/visualizing 3D data (Z values)
PyQt4 is present in the QGIS versions of William to be used in the Python console, so, automatically you have a backend. -- View this message in context: http://osgeo-org.1560.n6.nabble.com/Using-visualizing-3D-data-Z-values-tp4126375p5009181.html Sent from the Quantum GIS - User mailing list archive at Nabble.com. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Using/visualizing 3D data (Z values)
Hi all, 1. I made a TIN surface, using the interpolation plugin, from a point shapefile (with ALTITUDE field) and 3D line shapefiles. I lost time trying to extract the relevant lines from the line shapefiles without loosing the 3D information (Z values of the nodes). If I remember well, I first used Merge Layers from the mmqgis plugin, and it kept the Z information. Than, I used the Intersection command in the Vector menu, and the Z information was lost. Finally, after manually selecting the relevant lines and using save as, I got the expected 3D line shapefile keeping the Z values. Is this loss of Z information a known limitation of the gdal vector commands in QGIS (vector menu) and is this limitation affecting all these commands? Or did I do something wrong? 2. In a second step, I wanted to be able to easily see (through labeling a Z field) or ask (with the identify command) those Z values from the 3D lines, so as to fine tune the interpretation of the topography. Again the gdal tool (in Vector menu) Node Extraction lost all Z information. Is there a workaround to create a point shapefile with a Z field? Or, at least, to keep the Z values in a point shapefile, rasterize it so as to be able to visualize the Z value using the Identify command on the raster? Thanking all the developers for this wonderful program, -- Paul ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Using/visualizing 3D data (Z values)
Hi Paul Unfortunately, the current geometry system does not handle z- and m-values in a sound way. Some tools consider z and others don't. M-values are even more difficult as they cannot be accessed by the QGIS API (z-coordinates can be read by parsing the binary format of the geometry). An overhaul of the geometry system is planned for version 2. Regards, Marco On 05.12.2011 10:42, Paul Lens wrote: Hi all, 1. I made a TIN surface, using the interpolation plugin, from a point shapefile (with ALTITUDE field) and 3D line shapefiles. I lost time trying to extract the relevant lines from the line shapefiles without loosing the 3D information (Z values of the nodes). If I remember well, I first used Merge Layers from the mmqgis plugin, and it kept the Z information. Than, I used the Intersection command in the Vector menu, and the Z information was lost. Finally, after manually selecting the relevant lines and using save as, I got the expected 3D line shapefile keeping the Z values. Is this loss of Z information a known limitation of the gdal vector commands in QGIS (vector menu) and is this limitation affecting all these commands? Or did I do something wrong? 2. In a second step, I wanted to be able to easily see (through labeling a Z field) or ask (with the identify command) those Z values from the 3D lines, so as to fine tune the interpretation of the topography. Again the gdal tool (in Vector menu) Node Extraction lost all Z information. Is there a workaround to create a point shapefile with a Z field? Or, at least, to keep the Z values in a point shapefile, rasterize it so as to be able to visualize the Z value using the Identify command on the raster? Thanking all the developers for this wonderful program, -- Dr. Marco Hugentobler Sourcepole - Linux Open Source Solutions Churerstrasse 22, CH-8808 Pfäffikon SZ, Switzerland marco.hugentob...@sourcepole.ch http://www.sourcepole.ch Technical Advisor QGIS Project Steering Committee ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
