Image analysis compared with other methods for measuring ground cover

被引:71
作者
Booth, DT
Cox, SE
Fifield, C
Phillips, M
Williamson, N
机构
[1] USDA ARS, High Plains Grasslands Res Stn, Cheyenne, WY 82009 USA
[2] USDI, Bur Land Management, Casper, WY USA
[3] USDI, Natl Pk Serv, Estes Pk, CO USA
关键词
bare ground; digital image; green vegetation cover; line intercept; pace transect; point frame; VegMeasure; remote sensing;
D O I
10.1080/15324980590916486
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Ground cover is a key indicator of rangeland health but conventional methods for measuring ground cover are labor intensive. Analysis of digital images has the potential to reduce ground-cover-measurement labor requirements. We compared cover measurements by image analyses of digital images (sensor resolution =0.97 mm/ pixel ground sample distance) with measurements derived from a laser point frame, and from two transect methods. We found there was low agreement in plot-to-plot comparisons but results were usually not different when averaged over a large number of plots or transects. We conclude that image analysis of large numbers of samples (images) produce mean values not different from conventional field methods, and, that image analysis is a superior choice for detecting relative change, since it facilitates greater data collection, reduces human bias by limiting human judgments, and provides a permanent record in images that can be retained for future scrutiny.
引用
收藏
页码:91 / 100
页数:10
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