Remote sensing and geographical information systems

Spatial information derived from remotely sensed imagery is often further analyzed within a geographical information system (GIS). A GIS can be defined as a computer-based system that allows input, management, retrieval, analysis, manipulation and presentation of geo-information [400]. Imaging remote sensing provides spatial data on electromagnetic radiation emitted or reflected by the Earth surface. Through analysis, including image processing and information extraction, these data may be converted into information relevant to a GIS. There are at least three reasons why GIS and remote sensing can benefit from their mutual integration: 1.