[mkgmap-dev] Re: ASTER elevation dataFrom Toby Speight T.M.Speight.90 at cantab.net on Wed Jul 1 00:03:26 BST 2009
0> In article <4A4A84BD.2090801 at gmx.de>, 0> Christian Gawron <URL:mailto:christian.gawron at gmx.de> ("CG") wrote: CG> I already wrote a class to read SRTM data directly with mkgmap, CG> i.e. without having to create the contours as separate (huge) files. 0> In article <af62527b0906301439t7472b68fofd2770753eeb36a5 at mail.gmail.com>, 0> Ben Konrath <URL:mailto:ben at bagu.org> ("Ben") wrote: Ben> This feature seems really cool! I'm looking forward to trying it Ben> out. Seconded - although don't overlook the benefit of saving generated contours in big files, as they are computed very rarely, but the OSM data change frequently. Christian - does your contour generation attempt any curve fitting, or does it use the linear-interpolation-along-cell-edges algorithm as in gdal_contour (which is what I currently use to generate contours from GeoTIFF files)? A final warning on the ASTER data - the web site says that the data are free for "any users (individual/organization) who conduct work or research in 9 societal benefit areas (disaster, health, energy, climate, weather, ecosystem, agriculture, and biodiversity) defined by GEOSS (Global Earth Observation System of System)". Presumably others are not so entitled; there also seems to be restrictions on distributing derived works (e.g. posting generated Garmin OSM maps with ASTER contours).  <URL: http://www.ersdac.or.jp/GDEM/E/3.html >
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