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11 votes
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Update DEM based on line feature in QGIS

You can use r.carve within QGIS and set up a negative stream depth to increase the height of your DEM along your line feature (In the image below a positive stream depth have been applied to the DTM)
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  • 1,439
5 votes

QGIS Apply Correction to Elevation Datum

Use this expression in the raster calculator: "name_of_your_dtm@1" + 2 But as Erik suggested it you shall have a look at the official tutorial where most of the solutions are already ...
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4 votes
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Saving Mapzen Global Terrain in QGIS with extent layer (-90 to 90 Lat and -180 to 180 Lon)

No. Mapzen Global Terrain tiles will be designed for use in Web Mercator projection, which only goes to ±85.05.. degrees of latitude. From Wikipedia: Because the Mercator projects the poles at ...
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2 votes

Adding lines to polygons in QGIS

Okay, so I believe I found the solution - thanks guys for the tip of using "geometry from expression", that was the ticket! Should anyone else get this problem: Firstly, I converted my ...
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1 vote

How can I improve the accuracy of a DEM using surveyed points?

Don't be fooled into thinking that you are improving the accuracy of your data. The only 'accurate' data would be the survey points themselves. You apparently do not know anything about the quality ...
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  • 7,137
1 vote

Artificially extend a DEM to clip it

I found a way to do it on Python: (PS: I USED A DIFFERENT DEM FOR THE EXAMPLE, TO DEMONSTRATE HOW TO DEAL WITH BORDERS) # Open the DEM and extract all the info about it src = rio.open('IfSAR_merged....
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  • 107
1 vote

Infer the topobathymetric surface of a reservoir

I have one approach to this problem, though I am not sure it would suit your needs. Basically, you are dealing with an area of interest where the terrestrial data is known, but the bathymetric regions ...
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