Martin, it would be really nice if the WKBWriter
(a) had a constructor that simply takes an "includeSRID" parameter
(b) worked out the 2d/3d thing for itself.
On 2013-08-20 03:16, Martin Davis wrote:
Sigh, yes, the JTS handling of Z values is a bit weak right now.
Hoping to improve this in redesign of the API - but it will break lots
of things unfortunately.
In absence of better metadata about the coordinate dimension the
method of checking for Z = NaN is about all that can be done right
now, . Be aware however that Geometry.getCoordinates() is a bit
inefficient for complex geometries, since it has to create one big
array to hold all Coordinate values, and then traverse the geometry
copying the references. Using a CoordinateFilter would be more efficient.
On Monday, August 19, 2013 5:16:59 AM UTC-7, Nicolas Fortin (OrbisGIS)
wrote:
I'm sorry, it's my mistake, Geometry.getDimension does not return
2 or 3. It is related to geometry type, not coordinates. The only
way I found to test if a Geometry contain a Z coordinate somewhere
is through the following function:
/**
* @param coordinates Coordinate array
* @return True if the array is empty or contain only 2d
coordinates.
*/
private static boolean is2d(Coordinate[] coordinates) {
if(coordinates==null) {
return true;
}
for(Coordinate coordinate : coordinates) {
if(!Double.isNaN(coordinate.z)) {
return false;
}
}
return true;
}
Then the constructor become this
new WKBWriter(is2d(geometry.getCoordinates()) ? 2 : 3,
geom3d.getSRID() != 0)
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