On Wed, Jul 22, 2009 at 4:00 PM, Alice Kaerast<kaer...@qvox.org> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA256 > > On Wed, 22 Jul 2009 15:48:17 +0100 > Andy Allan <gravityst...@gmail.com> wrote: > > >> >> So we have (at least) three orthogonal properties >> a) Are there trees, swamp, mud or rocks on the ground (land cover) >> b) Is the area used for forestry, recreation or military training >> (land use) c) Is the area administered or designated or named as a >> "National Forest" "State Park" "National Park" "World Heritage Site" >> or some other such designation (administrative) >> > > There is also another property which hasn't been considered - type of > trees. Evergreen vs. Deciduous might be nice to know. Ordnance survey > maps differentiate between coniferous and non-coniferous and has > symbols for coppice and orchard.
Ah, that's just sub-typing of category A though - you can't have deciduous rocks or coniferous mud, so "type of trees" is a subcategory of "land cover is trees" rather than an independent (i.e. orthogonal) property. Doesn't mean that it's not important though! Cheers, Andy _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
