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

Bibliographic data

Multivolume work

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:: [THP-5 IMAGE INTERPRETATION AND ANALYSIS]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: INTERPRETATION OF COLOUR-INFRARED PHOTOGRAPHS FOR THE ASSESSMENT OF FOREST DECLINE IN CENTRAL EUROPE. Claus-Peter Gross, Norbert Heidingsfeld

Document type:: Multivolume work

Structure type:: Chapter

752 INTERPRETATION OF COLOUR-INFRARED PHOTOGRAPHS FOR THE ASSESSMENT OF FOREST DECLINE IN CENTRAL EUROPE Claus-Peter Gross Norbert Heidingsfeld Universität Freiburg i. Br. Abt. Luftbildmessung und Fernerkundung Werderring 6, D--7800 Frei bürg, FRG Forstliche Versuchsanstalt Rheinland-Pfalz, Abt. Waldschutz Schloss, D-6751 Trippstadt, FRG ABSTRACT In addition to the terrestrial assessment of new types of forest decline, the visual interpreta tion of large-scale Colour Infrared Photographs is a common and powerfull inventory method to detect and study new types of forest, damage in Central Europe. The paper summarizes on investigations of an international working team of experts in photo interpretation which allows to establish standard interpretation keys. KEY WORDS: Forest Damage, Photointerpretation, Colour-Infrared Photographs, Interpretation Keys 1 TERRESTRIAL FOREST DAMAGE SURVEYS 1.1 Main Symptoms and Assessment Methods The last decade saw a new type of forest de cline in many forest regions of Central Eu rope. The damage is widespread and indepen dent of 3ite conditions or proximity to in dustrial centres. The symptoms vary but gen erally point to air pollution. Main visible symptoms of the damages are: progressive loss of needle/leaf, discoloura tion affecting parts or the whole crown and also deformation of the crowns. Decreasing virour makes the afflicted trees prone to biotic as well as climatic effects. Further more remarkable decrease of timber increment can be observed. The situation is alarming and has led for estry and research institutes to develop ob servation and monitoring methods in order to inventory the extent, distribution and in crease of the forest, decline. In the Federal Republic of Germany (FRG), for example, this need has since 1983 been met by annual ter restrial inventories. The basis of data col lection ist a representative field survey using systematically distributed sample points tied to a geographic coordinate system (generally grids of 4 x 4 km). At each point, a number of sample trees are selected (gen erally 24 trees) and their crown condition is assessed every year /16/. For every single sample tree a visual assess ment. of defoliation is made in five classes separated according to needle/leaf loss per centage as follows /2/, /18/: Class Degree of Percentage of defoliation needle/leaf loss 0 not defoliated 0 - 10 % 1 slightly defoliated > 10 - 25 % 2 moderately defoliated > 25 - 60 % 3 severely defoliated > 60 - 99 % 4 dead 100 % Discolouration of the remaining foliage can additionally be assessed as in the following 4 classes: Class Discolouration Percentage of foliage discoloured 0 None 0 - 10 % 1 Slight > 10 - 25 % 2 Moderate > 25 - 60 % 3 Severe > 60 %

Access restriction

Copyright

fullscreen: Proceedings of the Symposium on Global and Environmental Monitoring (Part 1)

Multivolume work

Volume

Chapter

Chapter

Table of contents

Cite and reuse

Volume

Chapter

Image

Image fragment

Citation links

Citation recommendation