Title :
Representation of tree crown by multiple circles in aerial images
Author :
Komura, Ryotaro ; Kubo, Mamoru ; Muramoto, Ken-ichiro
Author_Institution :
Graduate Sch. of Natural Sci. & Technol., Kanazawa Univ., Japan
Abstract :
Investigates the distribution of crown size of trees using aerial images. In a previous study, a method was developed to draw a tree as a circle and estimate the crown size from the circle radius. But it was difficult to represent the complex shape of a crown by a circle. In this study the complex crown shape was reconstructed by several circles for estimating the size of the crown. First, the size of a circle was computed using the distribution of the brightness value within the circle area. Next, overlapping circles having similar brightness values were unified. As a result of this method the complex shape of a crown could be represented by several circles, and the size of the crown was analyzed accurately.
Keywords :
forestry; photogrammetry; remote sensing; aerial images; brightness distribution; circle radius; complex crown shape; crown size; environmental conditions; forests; multiple circle representations; overlapping circles; trees; Brightness; Digital cameras; Fingers; Frequency; Helicopters; Image analysis; Image color analysis; Instruments; Pixel; Spatial resolution;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 2002. IGARSS '02. 2002 IEEE International
Print_ISBN :
0-7803-7536-X
DOI :
10.1109/IGARSS.2002.1027199
