Knowledge Resource Center for Ecological Environment in Arid Area
| 报告编号 | DE2001781476 |
| Evaluation of New High-Resolution Image Collection and Processing Techniques for Estimating Shrub Cover and Detecting Landscape Changes. | |
| Hansen, D. J; Ostler, W. K. | |
| 英文摘要 | Research funded by the U.S. Department of Defense (DoD), U.S. Department of Energy (DOE), and the U.S. Environmental Protection Agency as part of the Strategic Environmental Research and Development Program (SERDP) evaluated novel techniques for collecting and processing high-resolution images in the Mojave Desert. Several camera types, lens, films, and digital processing techniques were evaluated on the basis of their ability to correctly estimate canopy cover of shrubs. A high degree of accuracy was obtained with photo scales of 1:1000 to 1:4000 and flatbed scanning rates from films or prints of 300 lines per inch or larger. Smaller scale images were of value in detecting retrospective changes in cover of large shrubs, but failed to detect smaller shrubs. New image-processing software, typically used in light microscopy, forensics, and industrial engineering, make it possible to accurately measure areas for total cover of up to four dominant shrub species in minutes compared to hours or days of field work. Canopy cover and individual shrub parameters such as width, length, circumference, and shape factors can be readily measured yielding size distribution histograms and other statistical data on plant community structure. These novel techniques are being evaluated in a four-year study of military training impacts at Fort Irwin, California. |
| 英文关键词 | Aerial surveying Image sensing Shrubs Deserts Land use Plants California Remote sensing Vegetation Military training Photography Environmental impacts Mojave Desert(California) |
| 出版年 | 2001 |
| 语种 | 英语 |
| 国家 | United States |
| 来源学科分类 | 48C - Natural Resource Surveys ; 57C - Botany ; 74 - Military Sciences |
| URL | http://r.cnki.net/KCMS/detail/detail.aspx?DbCode=KJBG&dbname=KJBGW&filename=59fb112331c97d1d549e8d69 |
| 来源机构 | Technical Information Center Oak Ridge Tennessee |
| 资源类型 | 科技报告 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/272952 |
| 推荐引用方式 GB/T 7714 | Hansen, D. J,Ostler, W. K.. Evaluation of New High-Resolution Image Collection and Processing Techniques for Estimating Shrub Cover and Detecting Landscape Changes.,2001. |
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