Hi!
I have a road network in a shapefile (polygons). When I read the shapefile, all the roundabouts become multipolygons. I assume this is because of a error with island detection. When I read the same shapefile using Civil3d (Autodesk) the roundabouts are perfect single polygons.
I already tried it with a sdf and a gml, but the problems persist.
Can someone please tell me what I am doing wrong.. This is a problem I have faced a lot of times, any help would be much appreciated!
Best answer by david_r
Did you try setting "Drop holes" to YES in the DonutBuilder?
Donuts are well supported in the FME shape libraries, so maybe also consider that there may be an error in the input files: https://docs.safe.com/fme/html/FME_Desktop_Documentation/FME_ReadersWriters/shapefile/Geometry-Support-shapefile.htm
You could perhaps try reading the shape files with e.g. QGIS to see if there's a difference in the interpretation of the geometries.
Also make sure to try with the most recent version of FME, if that's not already the case.
Have you tried using the DonutBuilder?
Thanks for the quick reply. I did, but it gives me more objects. I am actually looking for a way to 'read' the objects correctly.
Did you try setting "Drop holes" to YES in the DonutBuilder?
Donuts are well supported in the FME shape libraries, so maybe also consider that there may be an error in the input files: https://docs.safe.com/fme/html/FME_Desktop_Documentation/FME_ReadersWriters/shapefile/Geometry-Support-shapefile.htm
You could perhaps try reading the shape files with e.g. QGIS to see if there's a difference in the interpretation of the geometries.
Also make sure to try with the most recent version of FME, if that's not already the case.
+1Have you tried using the DonutBuilder?
What does FME Data Inspector/viewer say the geometry is? (If you click on a donut/hole geometry) - is it fme_donut or fme_aggregate? The SHP reader doesn't support aggregates - according to the reader doc - so might help explain it?
What does FME Data Inspector/viewer say the geometry is? (If you click on a donut/hole geometry) - is it fme_donut or fme_aggregate? The SHP reader doesn't support aggregates - according to the reader doc - so might help explain it?
Shape does support homogeneous aggregates, as long as you stick to point, line or polygon.
Did you try setting "Drop holes" to YES in the DonutBuilder?
Donuts are well supported in the FME shape libraries, so maybe also consider that there may be an error in the input files: https://docs.safe.com/fme/html/FME_Desktop_Documentation/FME_ReadersWriters/shapefile/Geometry-Support-shapefile.htm
You could perhaps try reading the shape files with e.g. QGIS to see if there's a difference in the interpretation of the geometries.
Also make sure to try with the most recent version of FME, if that's not already the case.
I have succesfully 'transformed' the data in to the desired result using the donutbuilder and filtering on yes or no wheter a object is a hole or not. Unfortunately this means I need to transform the data, hopefully this does not alter the data in a way that is not easily detected. For now the data looks good.
