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:: [FA-1 TOPOGRAPHIC ANALYSIS]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: Combined Application of Pattern Recognition Methods in Automatic Digitization of Contour Line Maps. Jun Yang

Document type:: Multivolume work

Structure type:: Chapter

810 Thereby the structural and numerical classification methods can in a combined manner be applicated in recognition of contour lines. The. structural method controls the processing procedures and the numerical method makes the decision which line segment belongs to the class to be expected. Recognition of figures and points. The figures and points that are used to build up the height informations of the terrain have individually to be extracted and classified by numerical pattern recognition. Wortbuilding. The individually recognized figures and points can construct the numbers which represent contour values and spot heights. The numbers can be reconstrue ted by syntactical classification. During this process some errors of text recognition, e.g. confounding 6 with 9, can be corrected in hand of know ledge based context method. Automatic assigning the heights to contour lines. After the recognition of con tour lines it is evident to which class they belong, but not the exact heights. In German Basic Map Series 1:5000 only the contour lines at the 10 meters ver- tival interval (called principal contour lines) have the full value, the other lines (called between contour lines) show only the last figure of the decimal position. At first the recognized heights should be assigned to the contour lines. There after the morphology and the topography of the terrain can be constructed de pending on the neighbouring principal contour lines and their features by means of knowledge based analysis. The morphological and topographical features main ly consist of the following three different terrain models: valley, top and slope that contain all kinds of terrain forms e.g. knob, bowl, saddle etc. Every bet ween contour line has to be examined to which terrain model it is belonging and the height of it must be carried over from the principal contour lines. Recognition of special symbols. The special symbols can be recognized by the numerical pattern recognition methods. Knowledge based controll of recognition procedures. This system is developed and tested in German Basic Map Series 1: 5000 and 1:20000. The different kinds of maps have different legends. Therefore the different symbols and the vertival interval have been used. The parameters and the recognition procedures are variable on different kind of maps. It is neccesary to build up a knowledge based system to automatically control the recognition processes of different kinds of contour line maps. Dipl. — Ing. Jun Yang Scientific assistant Institut of Cartography University of Hannover Appelstrasse 9 A 3000 HANNOVER 1 Federal Republic of Germany Tel. 0511/7623465

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