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added an elevation raster generation part

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afischerdev 2023-11-06 17:48:10 +01:00
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docs/developers/build_segments.md
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@ -26,7 +26,7 @@ official BRouter segments files are the ones provided by
[CGIAR](https://cgiarcsi.community/data/srtm-90m-digital-elevation-database-v4-1/). [CGIAR](https://cgiarcsi.community/data/srtm-90m-digital-elevation-database-v4-1/).
If you are working with rather small geographical extracts, you can download If you are working with rather small geographical extracts, you can download
tiles manually using [this tiles manually using [this
interface](http://srtm.csi.cgiar.org/SELECTION/inputCoord.asp) (use the interface](https://srtm.csi.cgiar.org/srtmdata/) (use the
"ArcInfo ASCII" format), instead of having to ask for an access for bulk "ArcInfo ASCII" format), instead of having to ask for an access for bulk
download of data. There is no need to unzip the downloaded files, the download of data. There is no need to unzip the downloaded files, the
`process_pbf_planet.sh` script expects a folder with all the ZIP files inside `process_pbf_planet.sh` script expects a folder with all the ZIP files inside
@ -48,3 +48,37 @@ and set the `PLANET_FILE` variable to point to it.
_Note:_ It is possible that you encounter an error complaining about not being _Note:_ It is possible that you encounter an error complaining about not being
able to run `bash^M` on Linux/Mac OS. You can fix this one by running able to run `bash^M` on Linux/Mac OS. You can fix this one by running
`sed -i -e 's/\r$//' process_pbf_planet.sh`. `sed -i -e 's/\r$//' process_pbf_planet.sh`.
## Run a generation for elevation data tiles
To match the 5x5 OSM data grid (*.rd5) files from BRouter, there are elevation
data in a 5x5 degree format (*.bef). At the moment (end of 2023) the naming of
this elevation tiles follows the konvention used by srtm.csi.cgiar.org: srtm_x_y
As the srtm files are only available between 60N and 60S the filenames above 60N
contains negative values. e.g. srtm_34_-1 as a tile above srtm_34_00.
Please see OSM wiki for more info on [srtm](https://wiki.openstreetmap.org/wiki/SRTM).
The converter generates bef tiles from `hgt` files, `zipped hgt` files and `zipped 'ESRI' asc` files.
Converter call with arguments for a single tile generation:
`ElevationRasterTileConverter <srtm-filename | all> <hgt-data-dir> <srtm-output-dir> [arc seconds (1 or 3,default=3)] [hgt-fallback-data-dir]
Samples:
$ ... ElevationRasterTileConverter srtm_34_-1 ./srtm/hgt3sec ./srtm/srtm3_bef
$ ... ElevationRasterTileConverter srtm_34_-1 ./srtm/hgt1sec ./srtm/srtm1_bef 1
$ ... ElevationRasterTileConverter srtm_34_-1 ./srtm/hgt1sec ./srtm/srtm1_bef 1 ./srtm/hgt3sec
`
Arguments for multi file generation (world wide):
`$ ... ElevationRasterTileConverter all ./srtm/hgt3sec ./srtm/srtm3_bef
$ ... ElevationRasterTileConverter all ./srtm/hgt1sec ./srtm/srtm1_bef 1
$ ... ElevationRasterTileConverter all ./srtm/hgt1sec ./srtm/srtm1_bef 1 ./srtm/hgt3sec
`
To use 1sec and 3sec bef tiles at rd5 generation time you need an extra parameter to the fallback folder.
E.g.
`$ ... PosUnifier nodes55 unodes55 bordernids.dat bordernodes.dat ../srtm/srtm1_bef ../srtm/srtm3_bef
`