Marine Corps Base Camp Lejeune Greenness Loss from 1984 to 2005

Critical military training and testing on lands along the nation’s coastal and estuarine shorelines are increasingly placed at risk because of development pressures in surrounding areas, impairments due to other anthropogenic disturbances, and increasing requirements for compliance with environmental regulations. The U.S. Department of Defense (DoD) intends to enhance and sustain its training and testing assets and to optimize its stewardship of natural resources through the development and application of an ecosystem-based management approach on DoD installations. To accomplish this goal, particularly for installations in estuarine/coastal environments, the Strategic Environmental Research and Development Program (SERDP) launched the Defense Coastal/Estuarine Research Program (DCERP) as a minimum 10-year effort at Marine Corps Base Camp Lejeune (MCBCL) in North Carolina. The results of the first six years of the program (DCERP1) are presented here. The overarching objectives of DCERP are to: (1) understand the effects of military training activities, infrastructure development, and other coastal military installations; (2) develop models, tools, and indicators to evaluate ecosystem health; and (3) recommend adaptive management strategies to sustain ecosystem natural resources within the context of an active military installation. This data package measures Loss of Green Vegetation between 1984 and 2005 from Landsat TM5 images. Results are based on the difference in the Tassle Cap greenness band recorded in 1984 and the greenness recorded in 2005. This Intensity of green loss was then developed into a five category green loss classification using the mean and standard deviation of the green loss difference data set, standardized to the 1984-2007 time period: 0. No green loss, green gain, or background 1. No significant change; values > 0 to =< 0.0035 (mean - SD) 2. Light green loss, reduced forest, impacted veg, etc; values > 0.0035 to =< 0.04556 (mean) 3. Moderate green loss; values > 0.04556 to =< 0.0876 (mean + SD) 4. Heavy green loss; values > 0.0876 to max. Classes 2, 3, and 4 are retained as significant green loss locations. Polygon patches are labeled with the intensity value in the attribute 'GRIDCODE'. Greenness loss in this area is a good indicator of human impact and development.

美国沿海与河口沿岸地带的关键军事训练与测试活动正日益面临风险，其诱因包括周边区域的开发压力、其他人为扰动引发的生态损伤，以及愈发严苛的环保合规要求。
美国国防部（U.S. Department of Defense, DoD）旨在通过在国防部设施中开发并应用基于生态系统的管理方法，强化并维持其训练与测试资产，并优化自然资源管理工作。为达成这一目标，尤其是针对河口/沿海环境中的设施，战略环境研究与发展计划（Strategic Environmental Research and Development Program, SERDP）启动了国防沿海/河口研究计划（Defense Coastal/Estuarine Research Program, DCERP），该计划在北卡罗来纳州的海军陆战队基地勒琼营（Marine Corps Base Camp Lejeune, MCBCL）开展，为期至少10年。本文呈现了该项目前六年（即DCERP1）的研究成果。
DCERP的总体目标如下：(1) 明晰军事训练活动、基础设施建设及其他沿海军事设施的生态影响；(2) 开发用于评估生态系统健康状况的模型、工具与指标；(3) 提出适应性管理策略，以在现役军事设施的场景下维持生态系统自然资源。
本数据包基于陆地卫星TM5（Landsat TM5）影像，测算1984年至2005年间的绿色植被损失量。测算结果以1984年与2005年记录的穗帽（Tassle Cap）绿度波段差值为依据。随后，以1984-2007年时间段的绿色植被损失差值数据集的均值与标准差为基准，将绿色损失强度划分为5个等级：
0. 无绿色植被损失、存在绿色增益或属于背景区域
1. 无显著变化；取值范围为>0至≤0.0035（均值-标准差）
2. 轻度绿色损失，表现为森林退化、植被受影响等；取值范围为>0.0035至≤0.04556（均值）
3. 中度绿色损失；取值范围为>0.04556至≤0.0876（均值+标准差）
4. 重度绿色损失；取值范围为>0.0876至最大值
其中等级2、3、4被归类为存在显著绿色植被损失的区域。多边形斑块通过属性字段`GRIDCODE`标注其强度等级。该区域的绿色植被损失可有效反映人为影响与开发活动情况。