[Qgis-user] question regarding linking Algorithms in Graphical Modeler

Albury, Carl -FS calbury at fs.fed.us
Tue Oct 21 14:39:20 PDT 2014 

Hi, I'm running QGIS 2.4.0-Chugiak on a Windows & machine, and I'm new to QGIS.

I'm trying run a model that has three algorithms, two of which are run in "parallel" and a third that uses the outputs from form the first two. I specified that that third The first algorithm runs fine but when it gets to the second it bombs with the message:
        C:\PROGRA~1\QGISCH~1\bin>exit
        Converting outputs
        Outputs: outfile =E:/temp/PreNBR7.tif
        OK. Execution took 49.503 ms (1 outputs).
        Prepare algorithm 1: r.mapcalculator - Calculate new raster map from a r.mapcalc expression.
        [Errno 9] Bad file descriptor See log for more details
The three pieces work fine when broken into separate models but I would like to have the whole thing run in one go..
I exported to a script (below) and have attached the model.

##test_dnbr=name
##rasterlayer_prenir=raster
##rasterlayer_preswir=raster
##rasterlayer_postnir=raster
##rasterlayer_postswir=raster
##outfile_alg0=output raster
##outfile_alg1=output raster
##outfile_alg2=output raster
outputs_0=processing.runalg("grass:r.mapcalculator", rasterlayer_prenir, rasterlayer_preswir, None, None, None, None, if((A+B)==0,0,1000*(A-B)/(A+B)), None, 0.0, outfile_alg0)
outputs_1=processing.runalg("grass:r.mapcalculator", rasterlayer_postnir, rasterlayer_postswir, None, None, None, None, if((A+B)==0,0,1000*(A-B)/(A+B)), None, 0.0, outfile_alg1)
outputs_2=processing.runalg("grass:r.mapcalculator", outputs_0['outfile'], outputs_1['outfile'], None, None, None, None,  A-B, None, 0.0, outfile_alg2)

Any suggestions are welcome,

Carl Albury
Remote Sensing Specialist
RedCastle Resources, Inc.

Working onsite at:
USDA Forest Service
Remote Sensing Applications Center (RSAC)
2222 West 2300 South
Salt Lake City, UT 84119
Office: (801) 975-3351
Mobile: (505) 231-3179
Email: calbury at fs.fed.us
RSAC FS Intranet website: http://fsweb.rsac.fs.fed.us/
RSAC FS Internet website: http://www.fs.fed.us/eng/rsac/

Log:
ALGORITHM|Tue Oct 21 2014 15:31:30|processing.runalg("modeler:dnbr_test","Z:/Projects/Mekong/imagery/LT50340372011287/LT50340372011287PAC01_toa_band4.tif","Z:/Projects/Mekong/imagery/LT50340372011287/LT50340372011287PAC01_toa_band7.tif","Z:/Projects/Mekong/imagery/LE70340372013268/LE70340372013268EDC00_toa_band4.tif","Z:/Projects/Mekong/imagery/LE70340372013268/LE70340372013268EDC00_toa_band7.tif","E:/temp/PreNBR8.tif","E:/temp/PostNBR8.tif","E:/temp/dNBR8.tif")
ERROR|Tue Oct 21 2014 15:32:23|Uncaught error while executing algorithm|Traceback (most recent call last):|Traceback (most recent call last):|  File "C:/PROGRA~1/QGISCH~1/apps/qgis/./python/plugins\processing\core\GeoAlgorithm.py", line 217, in execute|    self.processAlgorithm(progress)|  File "C:/PROGRA~1/QGISCH~1/apps/qgis/./python/plugins\processing\modeler\ModelerAlgorithm.py", line 607, in processAlgorithm|    self.prepareAlgorithm(alg, iAlg)|  File "C:/PROGRA~1/QGISCH~1/apps/qgis/./python/plugins\processing\modeler\ModelerAlgorithm.py", line 499, in prepareAlgorithm|    value = self.getMinCoveringExtent()|  File "C:/PROGRA~1/QGISCH~1/apps/qgis/./python/plugins\processing\modeler\ModelerAlgorithm.py", line 545, in getMinCoveringExtent|    layer = dataobjects.getObjectFromUri(param.value)|  File "C:/PROGRA~1/QGISCH~1/apps/qgis/./python/plugins\processing\tools\dataobjects.py", line 215, in getObjectFromUri|    print _loadedLayers|IOError: [Errno 9] Bad file descriptor|
ERROR|Tue Oct 21 2014 15:33:38|Could not load script: C:/PROGRA~1/QGISCH~1/apps/qgis/./python/plugins\processing\script\scripts\Split_vector_layer_by_attribute.py|Problem with line: ##output=output file|
ERROR|Tue Oct 21 2014 15:33:38|Could not load model notinorder.model|Error in algorithm name: saga:catchmentareaparallel
ERROR|Tue Oct 21 2014 15:33:38|Could not load model watersheds.model|Error in algorithm name: saga:catchmentareaparallel
ERROR|Tue Oct 21 2014 15:33:38|Could not load model notinorder.model|Error in algorithm name: saga:catchmentareaparallel
ERROR|Tue Oct 21 2014 15:33:38|Could not load model watersheds.model|Error in algorithm name: saga:catchmentareaparallel
ERROR|Tue Oct 21 2014 15:33:49|Could not load script: C:/PROGRA~1/QGISCH~1/apps/qgis/./python/plugins\processing\script\scripts\Split_vector_layer_by_attribute.py|Problem with line: ##output=output file|
ERROR|Tue Oct 21 2014 15:33:49|Could not load model notinorder.model|Error in algorithm name: saga:catchmentareaparallel
ERROR|Tue Oct 21 2014 15:33:49|Could not load model watersheds.model|Error in algorithm name: saga:catchmentareaparallel
ERROR|Tue Oct 21 2014 15:33:49|Could not load model notinorder.model|Error in algorithm name: saga:catchmentareaparallel
ERROR|Tue Oct 21 2014 15:33:49|Could not load model watersheds.model|Error in algorithm name: saga:catchmentareaparallel
ERROR|Tue Oct 21 2014 15:34:00|Could not load script: C:/PROGRA~1/QGISCH~1/apps/qgis/./python/plugins\processing\script\scripts\Split_vector_layer_by_attribute.py|Problem with line: ##output=output file|
ERROR|Tue Oct 21 2014 15:34:00|Could not load model notinorder.model|Error in algorithm name: saga:catchmentareaparallel
ERROR|Tue Oct 21 2014 15:34:00|Could not load model watersheds.model|Error in algorithm name: saga:catchmentareaparallel
ERROR|Tue Oct 21 2014 15:34:01|Could not load model notinorder.model|Error in algorithm name: saga:catchmentareaparallel
ERROR|Tue Oct 21 2014 15:34:01|Could not load model watersheds.model|Error in algorithm name: saga:catchmentareaparallel









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