[Qgis-user] Select heights from a raster layer

[Claus Backalarz]

Hi, we are novices in the QIS-world so bear with misunderstandings and misconceptions.

We have a raster layer with surface heights called DSM_611_86. Originally it is was a plain text file with a header describing number of rows and columns, geographically lower left corner etc. Data was the surface heights in 6250 rows and 6250 columns. The file was imported without problems with "Add raster layer" in QGIS. It is beautiful showed in QGIS2.14 Essen on Windows 7. So far no problem.

But we want with (a lot) of polygons representing buildings to select all surface heights inside this polygons. The selected heights should afterward be saved as a reduced raster layer or, even better, as a shape file of points with an attribute for the heights. In other words as a layer of points with one and only one attribute, the surface height.

We have tried the plug-in "Point Sampling Tools" and some other hints from QGIS home pages, but I seems that select and save heights in the described way is "out of scope".

Do anybody have a useful way out of this problem ?

Best regards
Claus B





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