RST lib quad_divide_data calls exit with 0

[marisn]

RST lib in quad_divide_data() calls exit with argument 0.

First - how a failure can be 0 (success)?

Second - #1598 This looks like one of those places, where G_fatal_error() is more appropriate.

Third - this exit() prevents interpolation when data points are arranged in a stripe (filling a hole between two map sheets). Is it really necessary to EXIT here instead of just printing a warning?

​http://trac.osgeo.org/grass/browser/grass/trunk/lib/rst/data/dataquad.c#L214

[marisn]

Data to display interpolation failure

[marisn]

Attached file contains a 3D shapefile with data stripe and hole in the middle. The goal is to interpolate data from surrounding points to fill the hole.

Unzip file, create a new location based on provided file. Remove imported vector file and import it again this time with -z option (see bug #1822).

Set region and run interpolation:

g.region -a res=20
v.surf.rst -z input=interpolate_this layer=1 elev=filled_hole

[martinl]

unable to reproduce