Converting/shp to osm using grass and gpsbabel
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In this example, the used files are stored in "C:\OSM\SHP\": kommunal.shp, kommunal.dbf, kommunal.sbn, kommunal.sbx, kommunal.prj.
"kommunal.shp" contains a street-network with very high accuracy - JOSM couldn't handle this...
Generalisation using GRASS:
Main article Simplifying OSM Shapefiles using GRASS (merge?)
- Put your shapefile including all belonging data (dbf etc.) to a fixed directory.
- Switch to command-line (start - run - cmd).
- Switch to GRASS-binary directory, e.g. cd C:\GRASS\bin\
- Remove possible existing maps (be careful): g.remove vect=OSM
- Load the shapefile to a GRASS-map: v.in.ogr -o dsn=C:\OSM\SHP\kommunal.shp out=OSM
- Reduce the amount of nodes: v.generalize input=OSM output=OSM_douglas_reduction method=douglas_reduction threshold=0 reduction=50 -c
- Write a new shapefile: v.out.ogr input=OSM_douglas_reduction dsn=C:\OSM\SHP\reduced olayer=kommunal_reduced
- Remove the GRASS-map: g.remove vect=OSM
Conversion to .osm using GPSBabel
- Switch to GPSBabel-binary directory, e.g. cd C:\GPSbabel\
- Check the shapefile's databse for street-names or other important data: gpsbabel.exe -i shape,name=? -f C:\OSM\SHP\reduced\kommunal_reduced.shp
- Here, STR_NAME contains the name of the streets. (This may not work if the field name is "name"?)
- Write an OSM-file: gpsbabel.exe -i shape,name=STR_NAME -f C:\OSM\SHP\reduced\kommunal_reduced.shp -o OSM -F C:\OSM\SHP\reduced\kommunal.osm
- This shapefile is already in EPSG:4326 = WGS84 and can be read by JOSM.
- Remove GPSBabel's tag from OSM file to save memory:
- Open your OSM-file with notepad
- Remove this tag: <tag k='created_by' v='GPSBabel-1.3.5'/>