Landsat imagery already allows to map some natural features or arterial roads. Resolution is bad but accuracy seems good. Frédéric 2009/1/5 Mikel Maron <mikel_maron at yahoo.com>: > Anyone interested to help map Gaza, please read this, reply, get in touch > > http://brainoff.com/weblog/2009/01/05/1385 > > -Mikel