How the History Aerial Photo Comparison is Put Together How the History Aerial Photo Comparison is Put Together Download imagery from USGS Earth Explorer (Free account needed to download; most interesting is to Single Aerial Photos) and USGS Historical Topographic Maps Use the QGIS Georeferencer to add control points and re-project the map. Export two matching area/scale images from QGIS showing the before and after Use the jQuery TwentyTwenty Plugin to provide the slider for your browser
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