[QGIS-Developer] pyqgis standalone script Unable to execute algorithm Input layers do not have the same grid extent

[Xristos Xristoou]

hello I create a simple pyqgis standalone script and I have some errors
with some datasets and I don't know why some times script work fine some
times script show me error :

TypeError: 'NoneType' object has no attribute '__getitem__'

that is because SAGA algorithm SAGA FLOW WIDTH AND SPECIFIC CATCHMENT AREA 1
don't work correct for some datasets for other raster datasets work fine
and I don't know why with the half dataset work and other not working.

and specific message in pycharm :

..\..\..\..\..\src\core\qgsmessagelog.cpp(45) :
(QgsMessageLog::logMessage) [31ms] 2017-11-01T00:03:06 Processing[1]
Unable to execute algorithmInput layers do not have the same grid
extent.Unable to execute algorithmInput layers do not have the same
grid extent.

all dataset is in some srs.

I think so and for other SAGA algorithm I have similar problem .

here code :

from __future__ import unicode_literalsimport qgisfrom qgis.core
import QgsApplication,QgsRasterLayerimport sys
qgs = QgsApplication([],
False)QgsApplication.setPrefixPath("C:/OSGeo4W64/apps/qgis-ltr",
True)QgsApplication.initQgis()
sys.path.append('C:/OSGeo4W64/apps/qgis-ltr/python/plugins')import
processingfrom processing.core.Processing import
ProcessingProcessing.initialize()
rasterLyr = QgsRasterLayer(dem_uri, 'spi')
rasterLyr.isValid()
outputs_GDALOGRSLOPE_1 = processing.runalg('gdalogr:slope', rasterLyr,
1.0, True, True, False, 1.0, None)
rasterLyr1 = QgsRasterLayer(outputs_GDALOGRSLOPE_1['OUTPUT'], 'spi1')
rasterLyr1.isValid().....................................
outputs_SAGAFLOWWIDTHANDSPECIFICCATCHMENTAREA_1 = processing.runalg
('saga:flowwidthandspecificcatchmentarea',rasterLyr,outputs_SAGACATCHMENTAREA_1
 ['CAREA'],0, None, None).....................................

some messages in pycharm editor :

Parameters
Grids: No objectsFiles: "C:path/to/image.tif"Transformation:
yesInterpolation: Nearest Neighbor


loading: C:path/to/image.tif
Driver: GTiffBands: 1Rows: 2523Columns: 3864


Transformation:

x' = 393.147600 + x * 15.000000 + y * 0.000000

y' = 4564.500000 + x * 0.000000 + y * -15.000000

warning: top-to-bottom and left-to-right cell sizes differ.
using cellsize: 15.000000

C:\Users\username\PycharmProjects\ungdal>saga_cmd ta_hydrology
"Catchment Area (Parallel)"  -ELEVATION
"C:\Users\usernamen\AppData\Local\Temp\processing7d1c790b04654237b47a304b19a97535\dec292515b8d4b25864383e8cd17f368\C:pathtoimagetif.sgrd"
-Method 0 -CAREA
"C:\Users\username\AppData\Local\Temp\processing7d1c790b04654237b47a304b19a97535\ece26af68ad042bc8a77aa7665ec6cff\CAREA.sdat"


_____________________________________________
library path:   C:\OSGeo4W64\apps\saga\modules\ta_hydrology.dll
library name:   Terrain Analysis - Hydrology
tool name   :   Catchment Area (Parallel)
author      :   O.Conrad (c) 2001-2010, T.Grabs portions (c) 2010
_____________________________________________
Load grid: C:\Users\username\AppData\Local\Temp\processing7d1c790b04654237b47a304b19a97535\dec292515b8d4b25864383e8cd17f368\
C:pathtoimagetif.sgrd...



Parameters

Grid system: 15; 252x 385y; 3933.647600x 4506.000000yElevation:
C:pathtoimagetifSink Routes: <not set>Weight: <not set>Material: <not
set>Target: <not set>Catchment Area: Catchment AreaCatchment Height:
<not set>Catchment Slope: <not set>Total accumulated Material: <not
set>Accumulated Material from _left_ side: <not set>Accumulated
Material from _right_ side: <not set>Step: 1Catchment Aspect: <not
set>Flow Path Length: <not set>Method: Deterministic 8Linear Flow:
noLinear Flow Threshold: 500.000000Linear Flow Threshold Grid: <not
set>Channel Direction: <not set>Convergence: 1.100000

error message:

..\..\..\..\..\src\core\qgsmessagelog.cpp(45) :
(QgsMessageLog::logMessage) [31ms] 2017-11-01T00:03:06 Processing[1]
Unable to execute algorithmInput layers do not have the same grid
extent.Unable to execute algorithmInput layers do not have the same
grid extent.
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