Proceedings of the Symposium on Global and Environmental Monitoring: Proceedings of the Symposium on Global and Environmental Monitoring

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Persistent identifier:: 856665355

Title:: Proceedings of the Symposium on Global and Environmental Monitoring

Sub title:: techniques and impacts ; September 17 - 21, 1990, Victoria Conference Centre, Victoria, British Columbia, Canada

Year of publication:: 1990

Place of publication:: Victoria, BC

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 856665355

Language:: English

Document type:: Multivolume work

Volume

Persistent identifier:: 856669164

Title:: Proceedings of the Symposium on Global and Environmental Monitoring

Sub title:: techniques and impacts; September 17 - 21, 1990, Victoria Conference Centre, Victoria, British Columbia, Canada

Scope:: XIV, 912 Seiten

Year of publication:: 1990

Place of publication:: Victoria, BC

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 856669164

Illustration:: Illustrationen, Diagramme, Karten

Signature of the source:: ZS 312(28,7,1)

Language:: English

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

Editor:: International Society for Photogrammetry and Remote Sensing, Commission of Photographic and Remote Sensing Data

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:: Volume

Collection:: Earth sciences

Chapter

Title:: [WA-3 DEMOGRAPHIC AND URBAN APPLICATIONS]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: AN ANALYSIS OF SETTL EMENT DEI EOT ABILI! Y IN CENTRAL EUROPE USING SIR-B RADAR IMAGERY. Dr. Floyd M. Henderson

Document type:: Multivolume work

Structure type:: Chapter

206 seen in Figure 1, each of the data takes overlapped in one limited area, but each also recorded relatively extensive areas of terrain (i.e.. Data Take 97.4--8484 sq. km.; Data Take 93.2--4148 sq. km.; and Data Take 45.2--7600 sq. km.). A changing and varied mixture of forest and field landscape patterns, topography, and numerous settlements in a northern boreal forest environment comprised the study area for this investigation. METHODOLOGY The 1:500,000 master positive transparencies (first generation) of the imagery were optically enlarged (2X to 8X) and all sites thought to be settlements were recorded on transparent overlays. The overlays were then registered to maps at a scale of 1:200,000. For purposes of this study, "settlements" were defined as all clusters of 4 or more structures and dwellings indicated by individual structure symbols and/or designated by placename on the 1:200,000 topographic maps. Errors of omission and commission were tabulated and their locations noted on the maps. In some instances topographic maps at scales of 1:100,000 and 1:50,000 were also consulted for error source identification. The spatial patterns of errors and correct identifications were examined by referring to and comparing the radar imagery, overlays and maps. Field work was also conducted be traversing approximately 75 per cent of the entire study area and noting site and causes of errors. After preliminary analysis of all three data sets (but prior to error analysis) a second interpretation was completed using only Data Takes 45.2 and 97.4. As these two sets slightly overlapped and ran almost perpendicular to each other (see Figure 1) the purpose was to compare the effect of incidence angle and look direction over similar terrain and topographic conditions. In this instance, only those areas comprised of forested hills and mountains with intervening meadow areas were included. That is, this simple landscape pattern reduced the environmental variables in the data set. The simplified environment allowed a comparison of the effect of look direction with regard to terrain slopes and an examination of detectability under conditions where the high specular return of settlement structures in open areas and clearings would provide high contrast to the uniform medium-to-dark gray surrounding forest cover and fields. ANALYSIS AND RESULTS The results of the interpretation of the three SIR-B data takes are found in Table II. It is apparent that Pass 2 (Take 93.2) with the smallest angle of incidence (15.7 degrees) was the poorest image in terms of percent detection (44.9 %) and in absolute accuracy--27.7% (i.e., the greatest number of commission errors). The steep incidence angle of this pass produced a great many specular returns from non-settlement targets including road intersections, some hill slopes, quarries, and open water/wetland areas. These results were the exact opposite of that reported by Sieber and Hartl (1986). However, the present study incorporated a much larger sample size and study area and concentrated only on settlement detection.

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