Heads up digitizing with v.digit

Buffering with v.buffer

Result (areas colored by number of overlapping areas, categories of layer 1 and 2)

Another example of overlapping features in one layer (overpass)

Example of import and use in GRASS

• v.in.ogr dsn=./shp/ layer=fire output=fire_p
• v.category input=fire_p output=fire_c type=centroid field=2
• echo "create table fire_c_2 (id int, num int)" | db.execute
• v.db.connect map=fire_c driver=pg database=bridge layer=2 table=fire_c_2 key=id
• v.to.db map=fire_c layer=2 option=cat col1=id
• v.to.db map=fire_c layer=2 qlayer=1 option=query col1=num qcol="count(*)" type=centroid

Number of overlapping features is also written as category to centroid.

intersection (operator=and)

union (operator=or)

not (operator=not)

exclusive or (operator=xor)

Pie charts (default)

Bar charts (ctype=bar)

Split network into bands using v.net.iso

Allocate subnets using v.net.alloc

Shortest path using d.path