Bug report #19596

Updated by Jürgen Fischer over 5 years ago

[To see this problem and others with more context, check #19584.] https://issues.qgis.org/issues/19584.]

I had three 400MB 1-meter DEM .tif files, and RiverGIS only lets you query one file name per project, so I wanted to consolidate them. I tried Raster -> Miscellaneous -> Merge, but got a Memory Error every time.

I thought I'd cut the file size, so I tried Raster -> Extraction -> Clip Raster by Extent (Select extent on canvas)
First file worked, second showed correct "zoom to" extent but no image; under the Layers entry it showed:
1.79769e+308
-1.79769e+308
instead of
238.166
822.751

As I've seen in other QGIS functions, it turns out you can't edit and re-use a dialog! You must close it and start over and re-enter everything each time. Wish I could have just changed two characters between each of my files!

After the manual clip, there were a couple of (narrow, V-shaped) empty cracks protruding in from the file boundaries along the line where the clipped segment should meet the adjoining file. They met perfectly on the screen before the clip. I found I has to draw my manual boundary at least 300' beyond the apparent edge of the DEM to get it all! Seems strange... Yes, all the files and the map image were in the same 2226 project CRS.

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