SCHISM model output is a UGRID dataset that uses one-based indexing. The connectivity variables have the attribute start_index = 1. Attempting to open a SCHISM dataset failed with IndexErrors or similar.
These changes adapt the UGRID Mesh2DTopology helper to handle datasets with start_index = 1.
As part of this work the constraint that UGRID datasets must be opened with mask_and_scale=False was removed.
SCHISM model output is a UGRID dataset that uses one-based indexing. The connectivity variables have the attribute
start_index = 1. Attempting to open a SCHISM dataset failed with IndexErrors or similar.These changes adapt the UGRID Mesh2DTopology helper to handle datasets with
start_index = 1.As part of this work the constraint that UGRID datasets must be opened with
mask_and_scale=Falsewas removed.