just a wild guess:
you have lots of spaces in your path and file names. This is to be avoided in general, cause lots of function may eat this, but lots of others may not. Try it with underscores instead of spaces.

Am 24.05.2018, 15:25 Uhr, schrieb David Addy <davesgran...@gmail.com>:

Hi Nyall,
Thanks very much for looking at this.
The two versions are as follows:

From QGIS 2.18.16 I get:
gdalwarp -q -cutline "D:/My Pictures/QGIS Projects/Payne
calibration/payne_clipper.shp" -tr 0.639640252898 0.639640252898 -of GTiff "D:/My Pictures/QGIS Projects/Payne calibration/payne_modified.tif" "D:/My
Pictures/QGIS Projects/Payne calibration/p_clipped_Q2A.tif"

From QGIS 3.0.2 I get :
gdalwarp -ot Float32 -of GTiff -cutline path_to_data_file -crop_to_cutline
-dstnodata 0.0 "D:\\My Pictures\\QGIS Projects\\Payne
calibration\\payne_modified.tif"
C:/Users/DJAddy/AppData/Local/Temp/processing_fd479b6503d44fbcb53887e62e4cf315/f36463c35cc34f29b240d30ad811d6fd/OUTPUT.tif

The output file in Q3 is a temp file as I forgot to browse to the same name as above. "Payne modified" is my calibrated input file, and "payneclipper"
is my polygon clipping mask. The algorithms look quite different but I do
not know enough to know what is wrong.



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