I'd like to point out that I'm now having what I think should be
topologically clean CLC2000v15 and VMap0 edition 5.0 datasets. I'll
load these into the Landcover-DB as replacements for the current VMap0
and CLC layers.
Thanks to the great folks at GRASS GIS, most notably Markus M., the
procedure of cleaning large vector datasets like CORINE is now a matter
of just a few days and runs on a machine with far less than 32 GByte of
main menory !! One year ago, cleaning CORINE took about one and a half
months to complete just one single ! of multiple iterations and you
never knew if somebody would reboot the server while the job was still
running .... (which actually happened several times).
Having topologically clean datasets is a very important step for at
least two reasons:
1.) I expect TerraGear's overall stability to increase with
topologically clean vector data.
2.) Merging custom land cover data (like John Holden's great work) into
the "Custom Scenery" layer (at MapServer) had been failing in some
cases due to topological inconsistencies. I expect these failures
to disappear with topologically clean vector data.
I'll be providing a clean CLC2006 as well, but because that one's still
incomplete (and work in progress, actually) I think CLC2000 is more
important.
Cheers,
Martin.
--
Unix _IS_ user friendly - it's just selective about who its friends are !
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