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Titolo:
A COORDINATE-FREE AREA VARIANCE ESTIMATOR FOR FOREST STANDS WITH A FUZZY OUTLINE
Autore:
MAGNUSSEN S;
Indirizzi:
PACIFIC FORESTRY LAB,506 W BURNSIDE RD VICTORIA BC B82 1M5 CANADA PETAWAWA NATL FORESTRY INST CHALK RIVER ON K0J 1J0 CANADA
Titolo Testata:
Forest science
fascicolo: 1, volume: 42, anno: 1996,
pagine: 76 - 85
SICI:
0015-749X(1996)42:1<76:ACAVEF>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Keywords:
FOREST STANDS; AREA; POLYGONS; ERROR; MAPPING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
24
Recensione:
Indirizzi per estratti:
Citazione:
S. Magnussen, "A COORDINATE-FREE AREA VARIANCE ESTIMATOR FOR FOREST STANDS WITH A FUZZY OUTLINE", Forest science, 42(1), 1996, pp. 76-85

Abstract

Digitized forest maps offer the added convenience of automated area calculation of forest stand polygons. However, the ''actual'' stand areas in a forest management operation may deviate from the map value dueto the mapping process and the delineation procedures used to identify stand boundaries for management. operations. Three sources of area variances of mapped forest stand polygons are considered: the first dueto the uncertainty inherent in coordinates, a second due to the linear interpolation between points, and a third due to the basic fuzzinessof the boundary. A simple coordinate-free variance estimator is introduced, and predictions made from it are compared to a standard method requiring input of all polygon coordinates. When the coordinate-free variance estimator was applied to a set of simple polygons and a set of120 natural forest stand polygons, a generally good agreement was found between the results from the two types of estimators. The coordinate-free method is suited for planning purposes when the error components arising from the uncertainties of forest stand areas ave needed.

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Documento generato il 26/11/20 alle ore 11:32:00