3

I am trying to gap-fill Landsat 7 SLC-off images with open-source software as explained in the comment below this post.

I'm new to QGIS and have almost no knowledge with Python (I'm a GIS novice normally working with ArcGIS 10/Pro).

GdalTools is installed and checked and I am using the Band 1 mask (from USGS download) on Band 1. When I run FillNoData, it returns Band 1 with the gaps remaining.

enter image description here enter image description here

Improve this question
6
  • I've consulted these sites for the methods to use with QGIS: gis.stackexchange.com/questions/30250/… and grindgis.com/blog/… – Chris_80 Jan 27 '17 at 15:29
  • Please include all relevant information within your question rather than some only as comments. – PolyGeo♦ Jan 27 '17 at 19:00
  • I tried to but it would only let me provide 2 links, i.e. the two attachment pics, because I don't have 10 reputation points yet. But will in the future. – Chris_80 Jan 27 '17 at 19:13
  • All errors should be as text rather than pictures so that would free up a link slot. – PolyGeo♦ Jan 27 '17 at 19:25
  • I have the same problem you faced trying to gapfill Landsat 7 using Qgis 3.0.I have tried unchecking the 'do not use validity mask' not using 'validity mask' and vice versa.also I have unchecked one and checked the other for each of these. please explain how gapfill Landsat 7 data.I have tried ur method in qgis 3.0 with no success – Samuel Gachuhi Jun 15 '18 at 11:31
1

It may not matter but it appears you're output file is going straight into a tarball. You could try outputting (and reading from) elsewhere.

You could also try executing the the gdal_fillnodata command directly in GDAL commandline/shell (e.g. copy and paste the command from QGIS window, start the OSGEO4W shell, paste and execute).

Improve this answer
3
  • How do I display the python script running the gdal_fillnodata plugin so that I can copy and paste it directly into the GDAL commandline? Thank you. – Chris_80 Jan 28 '17 at 0:52
  • It's the command shown at the bottom of the Fill NoData dialog box in QGIS (the first image you show). E.g. "gdal_fillnodata.bat -md 100 ..." Press the edit button on the right-hand side of the box to copy. then paste that into the OSGeo4W Shell (Start -> QGIS) – Julian Rosser Jan 30 '17 at 10:10
  • Gotcha, thanks. Tried that without luck. I've also tried working on 1 band at a time and then also saving to a Temp folder. When I try to save to C:Users/myname/AppData/Local/Temp, I get the error "ERROR 6: GDALDriver::Create() ... no create method implemented for this format." Perhaps I don't have permission to save there or ? – Chris_80 Jan 31 '17 at 22:28
1

Ok, I've gotten it to work! Executing from commandline seems to be irrelevant, temp file seems to have been irrelevant.

What did work is I changed pixel search distance to 10 (just for the test), and then unchecked "band to operate on" and "do not use default validity mask". Only loaded 1 band at a time into QGIS. Now I'll tweak from here.

Improve this answer

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.