Present state of remote sensing applications to land classification and land evaluation. future prospects

Theodore Astaras

Abstrakt


Remote sensing is the science of deriving information about an object without actually coming into contact with it. The electromagnetic energy released by a target (object) provides a signal which is detected and measured by remote sensing systems such as optical sensors (film and CCD cameras, scanners) and radar sensors (imagers). In this paper, the solar, near and far infrared and microwave spectrum were considered, because these spectrum regions are recorded by the above sensors and used for geological, geomorphological, and land classification studies. The purposes of this paper are the following: First, to describe the Earth Resources Satellites such as LANDSAT, SPOT, ERS, IRS, JERS, RADARSAT and RESURS series, which are in orbit around the Earth, carry remote sensors (mainly image sensors/electrooptical sensors), observe, measure and monitor the whole environment of the Earth (lithosphere, cryosphere, hydrosphere and biosphere). Second, to describe briefly the up-to-day remote sensing technology, applied for land classification and evaluation (land-resources) studies. Third, to describe the Earth-resources satellites, going to be operated in the first decade of 2000, which show better spatial, spectral and radiometric resolution than the up-to-day ones.

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