Database Reference
In-Depth Information
How it works...
WeaddedabufferedsubsetofaPostGISlayerinOpenJUMPusingthe
Run Data-
store Query
menu.Wetooklinesfromadatabasetableandconvertedthemtopoly-
gons, to viewing them in OpenJUMP.
We then manually selected an area of interest that had two representative stream
polygonsdisjointedfromoneanother.Theideabeingthatthestreamswouldbeor
are connected in a natural state.
The
Fence
toolwasusedtodrawafreehandpolygonbetweenthestreams.A
uni-
on
querywasthenperformedtocombinethetwostreampolygonsandthefences.
Fences allow us to create temporary tables for use in spatial queries executed
against a database table.
