The goal is to enable a geoserver WFS request with a 3D bounding box so that we receive only geometries not disjoint with that 3D bounding box.
In other words, there is a min and max for the third coordinate as well as the first two.
In 2D we have in KVP:BBOX=x0,y0,x1,y1
However, in 3D we get:
Only 3d geometries that qualify for the min and max pairs for all three axes are returned.
Furthermore, OGC filters in POST requests will also support 3D BoundingBoxes, as for example:
<ogc:Filter>" <ogc:BBOX>" <gml:Envelope srsName=\"EPSG:4979\"> <gml:lowerCorner>-200 -200 0 </gml:lowerCorner> <gml:upperCorner> 200 200 50 </gml:upperCorner> </gml:Envelope> </ogc:BBOX> </ogc:Filter>
In order to accomplish this, Geotools must support
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10. ReferencedEnvelope fails when provided a 3D CRS
11. FeatureCollection getBounds() implementations fail when provided a 3D CRS
The changes are API additions, rather than changes.
There will be the following new interfaces in geoapi:
Furthermore, the existing BBOX as well as BBOX3D will support a new method BoundingBox getBounds() which returns a BoundingBox object representing the boundaries of the filter (BoundingBox3D if it is a BBOX3D).
There will be the following new classes in main
The FIlterFactory interfaces will be extended with the following methods:
Furthermore, the implementation of the existing bbox( ..., BoundingBox bbox) methods will be extended to automatically call the 3D methods if the supplied BoundingBox is in fact a BoundingBox3D.
The existence of BBOX3D filter has implications for FilterVisitors. Although the APi does not change, the visitor method bbox must support BBOX3D if it wants to regenerate the filter without loosing information.
Because of the generic bbox( ..., BoundingBox bbox) and getBounds() methods it is possible to copy a BBOX filter in a generic way (see last example below).
These implications must all be documented.
Envelope env = new ReferencedEnvelope(minx, maxx, miny, maxy, crs) BBOX filter = filterfac.bbox(propertyName, minx, miny, minz, maxx, maxy, maxz, srs); boolean result = filter.eval(geom); BBOX otherFilter = ... BBOX filter = filterfac.bbox(propertyName, otherfilter.getMinX(), ... , srs);
BoundingBox3D env = public ReferencedEnvelope3D(x1, x2, y1, y2, z1, z2, crs) BBOX3D filter = filterfac.bbox(propertyName, env); boolean result = filter.eval(geom); BBOX otherFilter = ... BBOX filter = filterfac.bbox(propertyName, otherfilter.getBounds());
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