Opened 12 years ago

Closed 12 years ago

Last modified 12 years ago

#380 closed defect (fixed)

change how small distJB is handled in GriddedSurfaceUtilities

Reported by: Peter Powers Owned by: Peter Powers
Priority: major Milestone: OpenSHA 1.3
Component: sha Version:
Keywords: Cc:


In the case of the Elsinore fault (and perhaps others), a >= 90 degree jog in the fault trace compounded with a steep dip results in a non-singular region being created from the gridded surface perimeter when trying to test if distJB is actually zero and the Region can not be created throwing an exception. P&K recommend porting region logic to GriddedSurfaceUtils?.

Attachments (1)

photo.JPG (19.4 KB) - added by Peter Powers 12 years ago.

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Change History (3)

comment:1 Changed 12 years ago by Peter Powers

Resolution: fixed
Status: newclosed

Added a new private method to GriddedRegionUtils? that uses java.awt.geom.Area to create a Shape from the perimeter of a GriddedSurface? in the same manner as done by a Region. No singularity checking is done and the method should always return. The method is adequite, but not perfect. See comments at GriddedSurfaceUtils?.isDjbZero() for more information.

Added in [8477]

Also privatized the Frankel version of the isDistJB_Zero method. This method could/should probably be changed to creating an area via unioning the Areas defined by the quads for each trace segment and then doing contains(). THis would elimiate the ~0.5km buffer around the surface projection of a source for which dJB=0 but shouldn't. Are Frankel surfaces even used anymore? Regardless, such an approach would be applicable to CompoundGriddedSurfaces? as well.

Changed 12 years ago by Peter Powers

Attachment: photo.JPG added

comment:2 Changed 12 years ago by Peter Powers

The attached photo illustrates the shortcoming of the modification/fix. For this geometry notice that there are some small areas for which the surface projection of the fault are being eliminated by virtue of the path that the perimeter follows.

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