299 fix 04 velocity basics #319
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Introduced in pygplates 1.0.0rc1. Calculates point velocities from a snapshot of resolved topologies.
But former is in cms/yr unlike the latter (kms/myr) in order to retain backward compatibility.
Uses PlateReconstruction.get_point_velocities() instead of ptt.velocity_tools.
- Velocity scatter plot now looks better (see #299). - Also plot mid-ocean ridges and transforms.
Reverse reconstruct initial points when initial time is non-zero regardless of whether plate IDs were supplied by user or not. This should fix #136. Also: - Added anchor plate ID to Points class (cannot be changed). - Added static polygons snapshot and general reconstruct snapshot methods to PlateReconstruction. - Reconstruction in PlateReconstruction now supports a non-zero 'from_time' which is now assumed to be a feature containing non-present-day geometry (which is first reverse reconstructed). - Separated class attributes from __init__ parameters in PlateReconstruction and Points classes.
- Test creation of Points object with non-zero time and anchor plates. - Test Points.reconstruct and Points.reconstruct_to_birth_age using actual reconstructed data.
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Using new
pygplates.TopologicalSnapshot.get_point_velocities()function (introduced in pyGPlates1.0.0rc1) to calculate velocities at point locations. This uses resolved topologies at the specified reconstruction time.The previous approach was to partition points (to assign plate IDs) using
pygplates.PlatePartitioner. But there are various issues with that approach, such as using static polygons to assign plate IDs which can be problematic at non-present day times because the static polygons do not have global coverage (like topological plates do).closes #299