Geografic-Information-System/lib/sites

Radim Blazek blazek at itc.it
Tue, 23 Sep 2003 12:11:27 +0200
[updated MN Oct 25 2003]

I have modified G_site* functions to use vectors. It is temporary solution
how to update s.* modules to 5.1/7 v.* without a lot of work. Attributes are
supported by G_site_get() but G_site_put() writes CELL category only
(attributes may be added later if needed). Old G_site* functions used by
v.in.sites are renamed to G_oldsites*. There are only 2 s.* modules in 5.1/7
(s.in.ascii,s.out.ascii; to be removed later) for tests of new SITESLIB. I
updated 2 other modules, v.random and v.surf.idw. It is not my intention to
update all other s.* modules as mostly I don't know too much about them and
don't need them.

To updated s.* to v.*, it is typically necessary:
1) ->key = "sites" => "input" / "output" / "vector"
2) ->description="... sites ..." => "... vector points ..."
3) ->gisprompt="old,site_lists,sites" => "old,vector,vector"
->gisprompt="any,site_lists,sites" => "any,vector,vector"
->gisprompt="new,site_lists,sites" => "new,vector,vector"
4) new function name and less parameters:
G_find_file ("site_lists",,) => G_find_sites (,)
5) fclose() => G_sites_close()
(Hint: to find close(), search for related G_fopen_sites_old())
6) add
#include
7) The Makefile needs a reference to $(SITESLIB).

New version is slower (dbf driver, 10000 points):
time(200x200cells) time(667x667cells)
s.surf.idw 0.43 10.71
v.surf.idw 1.76 11.35

Radim

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G_site_put() currently only writes 2D sites files.

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This modified sites lib reads *vector* maps. Any old sites files
have to be imported with v.in.sites first.