chapter  22
Remote Sensing and Urban Analysis
ByHans-Peter Bähr
Pages 10

Remote sensing is defined as a "technology for acquiring information from distant objects without getting in direct contact, taking the electromagnetic spectrum as the transport medium". We shall in the following restrict this very broad and generally accepted definition to imaging techniques. Remote sensing includes techniques for imaging both from satellites and airborne platforms. Therefore photogrammetry, which as long as 80 years ago had already developed mapping techniques for urban areas using aerial photography (see Schneider, 1974), is a well-established subset of remote sensing and not a separate field of activity (see Bahr and Vogtle, 1998).