期刊
INTERNATIONAL JOURNAL OF REMOTE SENSING
卷 27, 期 9-10, 页码 2049-2054出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/01431160500444764
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Wavelet analysis represents a powerful set of image processing techniques that have considerable potential to quantify ecologically relevant patterns at multiple scales. This paper provides a preliminary assessment of whether two-dimensional wavelets convolved with 1 m panchromatic aerial photography can be used to detect automatically the location and crown diameters of western juniper (Juniperus occidentalis) plants as they encroach upon a sagebrush (Artemisia spp.) steppe landscape. The juniper crown diameters derived from wavelet analysis produced a strong correlation with crown diameters measured via comparable hand-digitizing in a geographic information system (r=0.96, n=69) with a 5% commission and an 8% omission error. Through comparison with historical photography, we found that juniper plant cover increased 2.7 fold (from 2.7% to 7.3% total cover) during the period from 1939 to 1998 within the 15 ha study area. This approach has considerable potential for the long-term monitoring of vegetation change via aerial photograph and other remotely sensed imagery.
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