Christian Sengstock wrote:
Hi list,
i try to render a point on top of an existing wms-generated map. i
have the epsg:xxxx code, mapextent, width/size and so on. It wasn't a
big deal to render a point on top of the map as long as i used test
coordinates like 5.0 5.0 and a srid of -1 and a default wgs84 crs (as
crs of my featureType). but using it with real wms maps and given
srids leads to multiple exceptions thrown in the "liteRenderer".
They're depending on a faulty instanciation of the crs of my point
feature i guess. If the liteRenderer want's to do coordinate
tranformations wherefore it needs the coordinatereference system of my
featureType exceptions are thrown...
So my question is, how do i create best a single point using a given
epsg:xxxx srid string. Do i have to access a epsg database ?
Drop one of the implementations in (epsg-wkt or epsg-hsql) your
classpath, and then use the CRS facade classs to do the lookups, and
create a MathTransform. Once you have a math transform hunt down the JTS
utility class to move your point around.
Additional, how are the JTS srid and the GeoTools
coordinatereferencesytem interconnected. It seems to me the JTS srid
is not more than an identifier.
And thus every application ignores it.
Jody
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