[Gmsh] meshing around existing nodes on Earth's surface

[David Bernstein]

Hi Hetenyi, If I understand you correctly I believe it is possible to do this in Gmsh.  You can embed fixed points in surfaces easily.  Forcing a surface to be part of a sphere is more involved but if the surface has three or four boundary lines it might be easy to used RuledSurface.

Regards,
Dave


On Apr 1, 2015, at 6:55 AM, Hetényi György <gyorgy.hetenyi at sed.ethz.ch<mailto:gyorgy.hetenyi at sed.ethz.ch>> wrote:

Good afternoon,

I am new to GMSH and I have only spent about 10 minutes looking at the website and the manual, so please excuse me if my question is too naive.

I would be interested to know whether and how GMSH could be used for the following problem:
-there is a region defined on the surface of the Earth (given as a series of latitude-longitude pairs),
-the goal is to make a roughly equally spaced mesh on this spherical region (characterized with one parameter, average distance between nodes),
-there are already fixed nodes (initial mesh?) within this region that the final mesh should contain exactly (the edge of the surface does not have constrained points).

Any kind of help to start with the above problem would be appreciated.

With best regards,

György Hetényi

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Swiss Seismological Service
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Dr György Hetényi
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