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Structured grid processing

Par ECOLA Dernière modification 16/11/2013 18:49
This page is dedicated to a collection of linux programs developped to achieve fast, high quality, and semi-automatized structured grid generation and pre-processing

Structured land/sea mask flag : automatic construction from shorelines database

Bathymetry terrain model are often inappropriate to generate proper land/sea mask flag setting. The most secured way to perform this operation consists in creating a prior (closed) polygons set from which inside/outside detecting algorithm  can built the land/sea flag. However this can be  a tedious effort, especially in highly complex coastal areas. The grid generation and pre-processing software has been upgraded to automatically extract shorelines in the structured grid frame, filter details to a level consistent with the local grid resolution, eliminate unnecessary limits (inland lakes, etc...), and produce the consequent land/sea flag on grid (stored in a CF compliant netcdf file). The limits set (built as closed polygons) is also stored in a ASCII file, and can be easily edited to correct mis-formed limits.


Structured grid landmask generation example

Bay of Biscay polar grid example (courtesy of N. Ayoub, LEGOS)

Ocean mask in blue, continental mask in brown.

GSHHS original shorelines (gray lines), land/sea limits (blue lines).


For interactive graphical editing and plotting, see Genesis/xscan page.

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