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

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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:: [FA-3 FOREST DAMAGE]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: DIGITAL SITE CLASSIFICATION. Peter Holmgren, M. Sc forestry

Document type:: Multivolume work

Structure type:: Chapter

DIGITAL SITE CLASSIFICATION presented at ISPRS Commission VII, September 17-21, 1990 in Victoria, B.C. Canada. Peter Holmgren, M.Sc forestry Faculty of Forestry, Remote Sensing Laboratory Swedish University of Agricultural Sciences S-901 83 UMEA, SWEDEN phone: int+46 90 166554 fax: 165925 ABSTRACT Forest site variables were determined digitally by analysing a Digital Elevation Model, a soil map and a cadastral map, using definitions in the existing Swedish Site Classification System. The variables were estimated for each pixel (10x10m) in a 5x5 km square of land located in northern Sweden. A site index image was then produced for the test area. The estimates of sub-surface waterflow and ground moisture were evaluated against a field reference of 1000 circular plots. In no case could the computer estimates be labelled invalid. Instead it was discovered that a large number of the field reference plots were doubtfully classified due to subjective aspects in the existing classification system. It appears that site variables can be estimated digitally with good reliability. Subjective measurements in the field can give unreliable input to the otherwise objective and unbiased Site Classification System. INTRODUCTION Site classification, an overview of the Swedish system Site classification is a major component in forest management. All planning, operational as well as long-term strategic, has to consider the site quality as one of the most important factors in determining the proper action and timing of actions within a forest estate. The single most critical decision, when attempting economically efficient forestry, is at what age a stand should be clearcut. For Swedish conditions, the optimal cutting age can range between 65 and 150 years due to variations in site quality, including climate. The site does not only influence decisions made on economic and biological facts; also the silvicultural law of Sweden has several of its paragraphs based on the site conditions. As an example, for each site quality class a minimum cutting age is required by the law. It is thus evident that a rather sophisticated and objective Site Classification System (SCS) is required for Swedish forestry. Such a system has been developed and established over the last 15 years (HAGGLUND & LUNDMARK 1977,1982; HAGGLUND 1979). Today it is used by all interested parties, from law authorities to farmers. The base unit in the system is the Site Index, SI, which is defined as the height of a dominant tree at a reference age, normally 100 years, in a well managed stand of a certain species. Thus the SI T28 means that a Scots pine (T) stand grows to a height of 28 meters in 100 years; G32 that a Norway spruce (G) stand grows to 32 meters in 100 years. The SI can be converted to volume growth (m^/ha*year'^). 870

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