Issues Converting DEM to a Lower Resolution in QGIS 3

Question

I am having issues converting a 1 m DEM to a 5 m DEM on QGIS. I am working in the NAD83 UTM 20 projection and whenever I convert my 1 m DEM to 5 m DEM the output is always less than 5 (often 4.9987 or something like that).

My thoughts were that this was a projection issue giving the odd numbers but I tried to reproject and the issue remains. I thought that since maybe all my DEMs were at this resolution it would be ok for my purposes, but I am having issues using the SAGA accumulated cost algorithm and I am thinking it's probably related to the DEM resolution.

Any guidance?

What options are you using to convert your 1m DEM to 5m DEMs? — Spacedman, Dec 22 '21 at 13:55
I have been just clicking 'Export as' and changing the resolution then saving as a new file. Are there other ways? — Erioderma, Dec 22 '21 at 21:10

score 1 · Answer 1 · answered Dec 23 '21 at 03:45

1

I ended up solving this issue. I just used the Warp Projection under the Projection tab in the Raster toolbar. I was able to adjust the resolution that way. This also solved the other issues I was having processing Accumulated Costs with the DEMs.

answered Dec 23 '21 at 03:45

Erioderma

535
2
9

Issues Converting DEM to a Lower Resolution in QGIS 3

1 Answers1