On 12/14/06, Alexandre Leroux <[EMAIL PROTECTED]> wrote:
With all the high resolution imagery out there (GE, VE, Y!, etc.), we're wondering if there would be a way to access high resolution datasets for our own in-house virtual globe.
Theres no such thing as a free high-res global imagery dataset (yet!) For the US, the National Agriculture Imagery Program (NAIP) distributes high-res color aerial photos for most of the country. There are also the b&w DOQs, also freely available. Other countries might have similar programs but many will not be free. For the globe, the best I know of is Landsat imagery (30 meter resolution) ... you could cache their WMS server (which is down at the moment), download the raw data ( http://stp.jpl.nasa.gov/WMS_GM.html .. also down ) or get a pre-rendered global mosaic.. the best I can think of is the WorldLandsat742 (http://geotorrent.org/details.php?id=43) IMO, Landsat looks WAY better than high-res imagery at most zoom scales (aside from zooming to street level) .. just take a zoomed-out look at Google Earth and notice that the high-res patches are virtually incomprehensible until you zoom way in. Basically, If you want the real high-res, 1 meter, color .. you've got to fork it over to a satellite imagery provider. -- Matthew T. Perry GIS Analyst / Software Engineer National Center for Ecological Analysis and Synthesis (NCEAS) work: [EMAIL PROTECTED] web: http://www.perrygeo.net _______________________________________________ Geowanking mailing list [email protected] http://lists.burri.to/mailman/listinfo/geowanking
