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:: [THA-1 SECOND PLENARY SESSION]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: DETECTION AND REGISTRATION BY SPACE PHOTOGRAPHS OF CHANGES IN THE FOREST FUND AREAS CAUSED BY SEVERE FIRES AND CLEAR CUTTINGS. R. I. Elman, M. D. Breido

Document type:: Multivolume work

Structure type:: Chapter

0.6 - 0.7 micrometers fire centers are revealed by the presence of smoke trains, and on photographs in the band of 0.8 - 1.0 micrometers fragments containing the plots gone by forest fires (burns) are extracted. On space photographs and scanner images of high resolution in the band of 0.6 - 0.7 micrometers fragments with the supposed clear cuts, and in the band of 0.8 - 0.9 micrometers - fragments with comparatively small plots of the burnt forest are singled out. To connect the recorded survey fragments to the topographic basis the control points located in the neighbourhood are chosen on photographs. Further processing of the obtained remote sensing data is done with digital methods by the image processing system. After entering of the fragments into the system and connecting them by control points to the topographic base they are subjected to two-stage interpretation, ending in the extraction of changes contours. On the first interpretation stage the survey fragment of the space photograph is analysed by way of using its combination of cartographic and forest mensuration data. The analysis is done in the dialogue regime with visualization of graphical information on the monitor screen. The aim of this stage is to improve the reliability of revealing the photo plots reflecting the changes in the forest fund areas as a result of forest fires and clear cuts. On the second stage the revealed plots on the photograph are accurately connected to the cartographic topo- base and viewed at high magnification (with the magnifying glass) to get the information about the location and size of plots, gone by fires, and cuts with the accuracy high enough for practical work. The division of the process of interpreting space photographs into two different stages (viewing and detailed interpretation) makes it possible to considerably shorten time spent on the processing and to consider in detail only the currently changed forest plots. The newly shown burns and cuts are determined by way of comparing the contours of burnt plots and cuts of the past assessment periods stored in the cartographic base, and contours of these areas extracted by the space photograph. On the final processing stage the editing and indexing of contours of plots with changes extracted by the photograph, their rectification into the topo-base projection, building-in into the contour network, calculation of areas and input of changes into forest mensuration description of the considered region are done. The knowledge of the stored in the forest mensuration base characteristics of the burnt plots and cuts referring to the period that took place before these events allows to determine the volume of the burnt and cut timber and to reveal main violations of the forest use order established for the given region. In experimental testing of the method with the materials of space photographs of the East Siberia forests the 10% accuracy of determining cutting areas with the probability level of 0.85 - 0.9 was achieved. The assessment was done by comparing the results of the detailed interpretation of space photographs with the data about the same cuts obtained by aerial photographs at scale 1:25000. Experience in revealing plots gone by fires has shown that even such a distinct interpretation feature as the availability of the smoke train not always allows to detect the burnt area especially if the image of the terrain is quite "motley", and the plots have not too large a size. It was possible to record burnt areas of more than 200 ha reliably enough. It was difficult to determine areas of plots gone by fires in marshlands of the West Siberia. The developed system is used in the complex of technical means Pericolor-Nova-Photomation, exchanging information through inner communication channels.

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