I have many rasters that im trying to combine in order to produce contours. They are in the .bil format so I understand that i need to translate them using gdal first but none of my attempts have worked.

I have tried to used gdal_translate and gdal_merge with no success.

import os 
import sys
import gdal 
chdir C:\Users\jeswa\Desktop\GAL
chdir C:\Users\jeswa\Desktop\TESTY
dir /s/b *.bil >listbil.txt
gdalbuildvrt -input_file_list listbil.txt testscript.vrt
#error does not like N34025raster but passes 44 and 45
gdal_translate -of GTiff C:\Users\jeswa\Desktop\TESTY\testscript.vrt C:/Users/jeswa/Desktop/TESTY/VIRTUALTIFF.tif
#no such thing as gdal_translate apparently

  • 1
    What error messages are you getting? What is the value of your %PATH% after SDKShell? I use a very similar process to this and it works well; you could try CD c:\your\path\to\GDAL\bin so you can (hopefully) find translate. – Michael Stimson Jul 2 '19 at 0:26
  • i’ve decided to skip the translate and produce contours from my vrt, is this acceptable? – Jesse Warren Jul 2 '19 at 1:04
  • It should be but be aware that VRT is a slower raster format than a single image file, if you can translate to GeoTIFF with no compression your contours will run much faster. – Michael Stimson Jul 2 '19 at 1:21
  • 2
    Why are you doing Python imports in your shell script? Is that some error of formatting in your question? – alphabetasoup Jul 2 '19 at 1:41
  • i’m not really sure how to work through QGIS python, which is a requirement, and i only really have experience with arcpy – Jesse Warren Jul 2 '19 at 1:42

QGIS can read BIL files. And you can merge the individual files using Processing Algorithms via Python without using GDAL directly.

  • Load individual files in QGIS (bulk drag/drop)
  • Open Python Console
  • Call the processing algorithm gdal:merge via processing.run()

A very similar example is at http://www.qgistutorials.com/en/docs/3/processing_algorithms_pyqgis.html

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