Modern trends of education in photogrammetry & remote sensing

Bibliographic data

Monograph

Persistent identifier:: 856467936

Title:: Modern trends of education in photogrammetry & remote sensing

Sub title:: ISPRS Commission VI Symposium, September 13 - 16, 1990, Rhodes Island, Greece

Scope:: 1 Online-Ressource (251 Seiten)

Year of publication:: 1990

Place of publication:: Athens

Publisher of the original:: Technical Chamber of Greece

Identifier (digital):: 856467936

Illustration:: Diagramme

Language:: English

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2016

Document type:: Monograph

Collection:: Earth sciences

Chapter

Title:: History, MLD and National Reports (WG's VI/1, VI/3 and TF).

Document type:: Monograph

Structure type:: Chapter

Chapter

Title:: RADARSAT: A new source of data for resource management. E. J. LANGHAM.

Document type:: Monograph

Structure type:: Chapter

The performance of the radar The primary goal of the RADARS AT mission is to generate economic benefits from the use of the radar data. For this reason when the mission requirements for RADARSAT were being defined careful consideration was given to the selection of the radar frequency. Experimental data was gathered from a wide variety of sources, including an ongoing multi-frequency airborne SAR experimental program. It was quickly discovered that on the one hand the range of possible applications of SAR data was far wider than had previously been expected but on the other it would require a very versatile SAR to provide data suitable to meet all these needs. This requirement has led to a design for a single frequency SAR which can function in a number of different modes under the control of an on-board computer. C-band was selected as the optimum frequency because it enables the greatest number of application needs to be satisfied. Each day ground control will transmit to the satellite a schedule of the day’s activities listing times at which the SAR is to be turned on and off corresponding to the geographic locations where the data are to be acquired. Associated with each SAR turn-on is a file of radar parameters specifying the required SAR mode. The SAR antenna consists of an array of emitting elements each fed with a constant amplitude signal thus defining the shape of the radar beam. The phase of these signals is programmable, however, and this permits the width and pointing direction of the beam to be selected at will in the range direction. As the satellite moves along its track the data from which the radar image is created are collected continuously. In this way, controlling the beam width, in effect, controls the swath width of the resulting picture. Associated with these variable swath widths are corresponding variations in the size of the resolution elements on the ground. Control of the beam direction enables the incidence angle to be varied. This allows a given site on the ground to be imaged from different directions thus permitting additional information to be obtained for features in the scene which are sensitive to the incidence angle. It also allows stereo pairs of images to be collected which can be used jointly with radar shadow information for geomorphological studies or alone to produce topographic maps. Where the scene parameters of interest are not sensitive to incidence angle the variable incidence angle can be used to increase the frequency of opportunities for obtaining images of a given site.

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