Exploring Keyhole Imagery’s Potential to detect landuse change between 1960s and 1980s

The study focuses on satellite imagery data from the USGS for a research area in China. The original vector data of the satellite imagery has been processed as follows:The imagery was categorized into three types based on resolution: meter-level, five-meter-level, and ten-meter-level, according to the classification in "Declassified Intelligence Satellite Photographs" (https://doi.org/10.3133/fs20083054).A 10 km interval grid of points was generated for the China region, and coverage information for each resolution type was collected for each grid point.The coverage frequency for each resolution type at each grid point. The coverage frequency for each resolution type at each period.Spatial distribution of imagery combination of different time periodsSpatial Distribution of repeated coverage across different periodsPython 2.7 combined with ArcGIS 10.2 was used for processing, and code was provided for each step.