We are converting a geometry table to another one and we would like to convert every invalid geometry to a single one easily identifiable by users in WKB or WKT form and not breaking the processing or display.
What could it be?
We do not want to use 'POLYGON EMPTY' because it could be something that exists in the original table. It could also be the result of some geoprocessing done on the converted table and then these ones would not be distinguiable from the original invalid ones...
Any better idea?