50 lines
1.2 KiB
Markdown
50 lines
1.2 KiB
Markdown
Countour line generator from LIDAR data
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---------------------------------------
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This accepts two kinds of contour data:
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**2017 variant**: y, x, z, separated by commas:
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```
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6062999.75,584000.75,88.07
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```
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Recommended whenever available. It is more dense, gridded (thus much faster),
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but not available outside major cities.
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**2009 variant**: x, y, z, separated by one or more spaces:
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```
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501991.670 6150000.000 57.689
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```
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2009 variant is less dense, non-gridded, therefore significantly slower
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(`gdal_grid` must be used as an extra step, which is slow). This variant is
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less robust, but available throughout the country.
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Usage
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-----
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1. Download contour lines to zip files in this directory.
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2. Adjust `BOUNDS` and `VARIANT` in `config.mk`.
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3. Run `make -j$(nproc) smooth_<X>.gpkg`. This will output a geo-package with
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contour lines every `X` meters. X can be fractional (e.g.
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`smooth_2.5.gpkg`).
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4. Optional: you may generate a raster image with `layer2img.py`.
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Dependencies for a Linux system:
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- docker
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- psql (client only)
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- gdal-bin
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- unzip
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- awk
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Example
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-------
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License
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-------
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Code in this directory is public domain.
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