47 lines
1.0 KiB
Markdown
47 lines
1.0 KiB
Markdown
Countour line generator from LIDAR data
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This accepts two kinds of contour data:
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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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*Non-gridded*, therefore significantly slower (`gdal_grid` must be used before making contours, which is slow).
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*2017*: 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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This is *gridded*, so quite fast.
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Usage:
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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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