Geo-ForPy - Fragmentation of Forest Cover in the Paraguayan Chaco - Landsat-5/7/8, 2000/2010/2020

This product is a shape file of all detected forest patches in the Paraguayan Chaco that are larger than 10 hectars fort he years 2000, 2010, and 2020. Every forest patch contains information on its perimeter, size, shape, and core area. By looking at all forest patches together, an impression can be gained of the fragmentation of the forest in the Paraguayan Chaco. Proximity is a measure of fragmentation. Areas of large and close by forest patches show high proximity values while isolated patches or patchest hat are only surrounded by small forest patches, have a small proximity. The Core area index quantifies the share of core area in the entire forest patch area. Thereby, corea area is the area of a forest patch with at least 500m distance to the edge of the forest. The Shape index is calculated from perimeter and area of a patch. The fragementation of a forest often has the effect that the ratio between area and perimeter is affected. The edge lengths become longer while the surface area becomes smaller.本产品为巴拉圭查科地区2000年、2010年及2020年三个年份中，所有面积大于10公顷的已检测森林斑块的形状文件（shape file）。每个森林斑块均附带其周长、面积、形状及核心面积相关属性信息。通过整合分析全部森林斑块数据，可清晰研判巴拉圭查科地区森林的破碎化格局。 邻近度（proximity）是衡量森林破碎化程度的指标：连片分布的大型森林斑块具有较高的邻近度数值，而孤立斑块或仅被小型森林斑块环绕的斑块，其邻近度数值则相对较低。 核心面积指数（Core area index）用于量化森林斑块的核心面积占其总面积的比例。其中，核心面积指距离森林边缘至少500米的森林区域。 形状指数（Shape index）由斑块的周长与面积计算得到。森林破碎化通常会改变斑块的面积与周长之比：斑块表面积缩减的同时，边缘长度却会相应增加。