Digital Geography

ALOS World 3D V1.1 vs. SRTM1

Some days ago a new version of the ALOS 30m DEM was released: Void pixels due to clouds and snow pixels within 60 deg. of north and south latitudes in Version 1 were complemented by existing DEMs. Out of the areas are same with Version 1 product. As we already compared ALOS with SRTM-1(I saw the ALOS DEM as “the winner”) I am now interested in how this performs in a another setting. We are changing our focus from Mongolia to Germany and check how the new ALOS DEM works compared with SRTM 1.

Maps for our robots

I have often wondered what could be the purpose of these mapping 3D models more and more accurate for major cities of the world (eg, Monaco, Geneva or Dubai). The level of detail provided by the standard City GML even imagine the level of detail taking into account the interior (Level Of Details-LOD4) architecture, street furniture, and even the vegetation with its growth and seasonal aspects . Applications in architecture and urban planning are obvious, but beyond … These models increasingly geographically and geometrically accurate (absolute GPS positioning errors of the edges and vertices of the order of 5 to 10cm…