[postgis-devel] Calculating flow direction
Pierre.Racine at sbf.ulaval.ca
Fri Jul 30 13:01:01 PDT 2010
This is great George,
I guess your function works only on a single raster. Would be nice if it would work on a tiled coverage. In this case you have to compute edge values by getting values from neighbour tiles. A bit (!!) more complicated.
From: postgis-devel-bounces at postgis.refractions.net [mailto:postgis-devel-bounces at postgis.refractions.net] On Behalf Of George Silva
Sent: 28 juillet 2010 21:48
To: PostGIS Development Discussion
Subject: [postgis-devel] Calculating flow direction
Hello PostGIS developers,
I just built a flow direction function for WKT Raster. I know it's not the most efficient, but looks like it works.
I would like (if you have the time/interest) to test it and report inconsistent results.
I'm working on function for identifying sinks, removing sinks and creating a accumulated flow raster.
Your comments are most welcome. The function is the attachment.
George R. C. Silva
Desenvolvimento em GIS
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