Elevation slope?

NextGIS Data
1

Hello Nextgis,

I bought your elevation data package and found a DEM raster and vector isolines included. What I need now is a slope angle map to identify locations with steep slopes. How can I do that?

2

Hello!

You can use QGIS (qgis.org) to calculate slopes. It is a free software.

Use the following workflow:

  1. Open .tif file from data.nextgis.com package in QGIS (simply drag-n-drop)
  2. Reproject it to the UTM Zone your data fit. For that, use Processing → Toolbox → GDAL → Raster projections → Warp (reproject). Input layer is your DEM .tif . Target CRS is your UTM zone. Resampling method to use: Bilinear. You’ll get correctly reprojected raster layer.
  3. Then run Processing → Toolbox → GDAL → Raster analysis → Slope. Input layer is reprojected DEM from step 2. Output is a raster with elevation slope angle in each pixel.