3.2.34. Improve DEM

Improves Digital Elevation Model, makes the resulting contour lines smoother and simpler.

Input, all fields are required:

  • Raster file - DEM file in TIFF format downloaded from NextGIS Data;

  • Interpolation method used to enhance the DEM file. Available methods:

    • Nearest neighbor (nearest)

    • Bilinear (bilinear)

    • Cubic (cubic)

    • Cubic spline (cubicspline)

    • Lanczos (lanczos)

    • Linear (average)

    • RMS (rms)

    • Mode (mode);

  • Interval between contours - Vertical step of the contour lines in meters;

  • Simplification step for the contour lines. Integer (for example, 2), decimal separated by a dot (for example, 0.02) or exponential notation (for example, 2e-2)

  • Refinement, % - Improvement of the DEM file resolution, in percents. Shows how much the pixel size should increase/decrease. For example, a value of 1000 % will result in 10 times smaller pixels

Output:

  • TIFF file of the refined DEM;

  • GeoPackage file of the contour lines.

../../_images/improvedem_input.png

Pic. 3.30. Input raster

../../_images/improvedem_result.png

Pic. 3.31. Processed raster and contours generated from it

Launch the tool: https://toolbox.nextgis.com/t/improvedem

Try it out using our sample:

Download input dataset to test the instrument. Step-by-step instructions included.

Get the output to additionally check the results.

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