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| centr | Compute shape centroids and areas. |
| inside | Finds shapes that contain given points |
| merge.tiles | Merges adjacent tiles (polygons) where possible |
| read.shp | Read ESRI shapefile |
| thin | Thin out polyline/polygon by removing unneeded points. |
| thin.shp | Thin out polyline/polygon by removing unneeded points. |