2015-2021年广州市天河区局部变化提取样例数据

样例数据为广州市天河区同一局部区域的自2015年至2021年的变化检测数据，通过比对同一区域不同时点的DSM数据和DOM数据获得。tif文件和tfw文件为该区域正射影像及相应空间参数数据，dxf为检出的变化区域矢量图斑，gmp文件为工程文件，便于统一浏览数据。

The sample dataset consists of change detection data for an identical local area in Tianhe District, Guangzhou, spanning from 2015 to 2021. This dataset is derived by comparing DSM (Digital Surface Model) and DOM (Digital Orthophoto Map) data of the same area at different time points. The .tif and .tfw files store the orthophoto of this area and its corresponding spatial parameter data; the .dxf file contains vector patches of the detected change regions; and the .gmp file is a project file designed for unified data browsing.