Seemingly simple question: I have a KMZ file with mesh objects in its placemark folder, I need to get these written to a shapefile. Any ideas? I tried a GeometryCoercer, no luck.
Solved
Turning a mesh into a polygon
+63Best answer by takashi
Hi @redgeographics, the data contains a feature which has a MultiSurface geometry consisting of two Mesh geometries. A possible way is:
- Deaggregator: MultiSurface -> individual Meshes
- GeometryCoercer (Geometry Type: fme_composite_surface): Meshes -> CompositeSurfaces
- GeometryPartExtractor: Extract polygon parts from the CompositeSurfaces, with this setting.
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+7You could try a Triangulator. The Triangles port will give you individual triangle polygons. With a Dissolver (or if that gets too messy and you don't mind multipolygons, an Aggregator) you could glue the whole thing together.
- Best Answer
Hi @redgeographics, the data contains a feature which has a MultiSurface geometry consisting of two Mesh geometries. A possible way is:
- Deaggregator: MultiSurface -> individual Meshes
- GeometryCoercer (Geometry Type: fme_composite_surface): Meshes -> CompositeSurfaces
- GeometryPartExtractor: Extract polygon parts from the CompositeSurfaces, with this setting.
+19- Supporter
A some what less elegant but working alternative is:
- Deaggregator
- GeometryFilter (everything but NULL)
- Triangulator >Triangles
- Second Deaggregator
- GeometryCoercer >fme_polygon
and voila, you have polygons.
+63Thanks @takashi, that did the trick. The data does come out in a local coordinate system but the prj file checks out and my mapping software seems to be able to put it in its right place.
Good to hear. Alternatively, a Deaggregator and a PythonCaller with this script could work more efficiently.
import fmeobjects
class MeshToPolygons(object):
def input(self, feature):
mesh = feature.getGeometry()
if isinstance(mesh, fmeobjects.FMEMesh):
vertices = mesh.getVertices()
for part in mesh:
indices = part.getVertexIndices()
if indices:
boundary = fmeobjects.FMELine([vertices[i] for i in indices])
feature.setGeometry(fmeobjects.FMEPolygon(boundary))
self.pyoutput(feature)