菲律宾林地信息提取及变化分析

Information Extraction and Change Analysis of Forestland in the Philippines

以菲律宾为研究区域,对研究区1990年、2017年两个时期的遥感数据进行处理,利用基于阈值的植被指数法提取各种自然和人工林地信息,并对其时空变化特征进行分析。结果表明:菲律宾总林地面积呈减少趋势,其中吕宋岛群再种林年均覆盖变化百分比最大,减少2.4%,米沙鄢岛群再种林年均覆盖变化百分比最大,增加135.2%,棉兰老岛群草地年均覆盖变化百分比最大,减少2.8%。

This paper uses Philippines as the study area,processes the data of the study area in 1990and 2017,utilizes the vegetation index method based on threshold value to extract forestland information,and analyzes the forestland information and change characteristics in the Philippines.The results indicate that the total forestland area in the Philippines is on the decrease,among which the percentage of annual change in replanted forest cover is the largest in Luzon group(decreased by 2.4%),the percentage of annual change in replanted forest cover is the largest in Visayas group(increased by 135.2%),and the percentage of annual change in grassland cover is the largest in Mindanao group(decreased by 2.8%).