New Stata package: "clipgeo" (clipping shapefiles on a bounding box)

[Asjad Naqvi]

Dear all,

Version 1.1 of "clipgeo" is up on GitHub:
https://github.com/asjadnaqvi/stata-clipgeo

This package takes a Stata shapefile and clips it on a bounding box. It provides two commands "clippolyline" and "clipolygon" that implement different algorithms for lines and shapes respectively.

The commands are fairly straightforward, for example:


clippolyline road_shp, box(-7000,11000,330000,355000)
clippolygon nuts0_shp, box(128, 146, -94, -80)

They generate a _shp_clipped.dta file that can be swapped in the original spmap code, e.g.:

spmap CAPACITY using road_shp, id(_ID) /// osize(0.02 0.08 1.5) cln(3) legend(off)
spmap CAPACITY using road_shp_clipped, id(_ID) /// osize(0.02 0.08 1.5) cln(3) legend(off)


and thats it!

Installation instructions, data, and code on GitHub. Please test it out and report bugs and suggestions for improvement if any. I will be send to SSC soon.

Polyline example:




Polygon example:

[Asjad Naqvi]

Two new examples added to showcase seamless clipping of islands, and other geometry. Plus the combination of colors and generating legends based on the zoomed area.

More here:

https://github.com/asjadnaqvi/stata-clipgeo

[Asjad Naqvi]

Now up on SSC thanks to Kit Baum!

ssc install clipgeo, replace