[geos-devel] Porting LengthIndexedLine.project?

strk strk at keybit.net
Thu Jul 23 15:53:06 EDT 2009

On Thu, Jul 23, 2009 at 11:13:34AM -0400, David Turner wrote:
> JTS has a class called LengthIndexedLine with a method "project", which
> lets you figure out  the nearest point on a line to a given point.  This
> is useful, for instance, if you are trying to figure out what street a
> person is on from (possibly slightly inaccurate) GPS observations.
> http://tsusiatsoftware.net/jts/javadoc/com/vividsolutions/jts/linearref/LengthIndexedLine.html#project(com.vividsolutions.jts.geom.Coordinate)
> PostGIS calls this function st_line_locate_point.
> GEOS doesn't seem to have it, even though I was under the impression
> that GEOS was merely a port of JTS.  If I port JTS's project function
> and related functions such as extractPoint to GEOS, would that patch be
> likely to be accepted?  Or am I missing something about the relationship
> between JTS and GEOS?

Your patch would be welcome. Make sure to include unit testing please.


 Free GIS & Flash consultant/developer      ()  ASCII Ribbon Campaign
 http://foo.keybit.net/~strk/services.html  /\  Keep it simple! 

More information about the geos-devel mailing list