Simplify geometry of spatial objects with the mapshaper library
Simplify geometry of spatial objects with the mapshaper library
mapshape(shp, percent = 10, ms_options = "", dsn = "mapshape", silent = FALSE)
shp |
A spatial object to be simplified. |
percent |
A number between 1 and 100 stating how aggressively to simplify the object (1 is a very aggressive simplification) |
ms_options |
Text string of options passed to mapshaper such as |
dsn |
The name of the temporary file to write to (deleted after use) |
silent |
Logical determining whether the function call is printed to screen
The percent argument refers to the percentage of removable points to retain.
So |
Note: more advance R/mapshaper tools are provided by the rmapshaper package: https://github.com/ateucher/rmapshaper.
Calls the JavaScript command-line GIS application mapshaper
(https://github.com/mbloch/mapshaper) from the system
to simplify geographic features, and then tidies up.
mapshaper must be installed and available to system().
mapshape writes new a file to disk.
Thanks to Richard and Adrian Ellison for demonstrating this in R.
Other geo:
bbox_scale(),
gclip(),
geo_bb_matrix(),
geo_bb(),
mapshape_available(),
quadrant(),
reproject()
## Not run: shp <- routes_fast[2, ] plot(shp) rfs10 <- mapshape(shp) rfs5 <- mapshape(shp, percent = 5) rfs1 <- mapshape(shp, percent = 1) plot(rfs10, add = TRUE, col = "red") plot(rfs5, add = TRUE, col = "blue") plot(rfs1, add = TRUE, col = "grey") # snap the lines to the nearest interval rfs_int <- mapshape(shp, ms_options = "snap-interval=0.001") plot(shp) plot(rfs_int, add = TRUE) mapshape(routes_fast_sf[2, ]) ## End(Not run)
Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.