Geographic images - Topics

Is it legal to publish satellite imagery of a sensitive military site? How can the shadow in an aerial photograph reveal the height of a building? How do you read a false-colour satellite image and know what the red patches mean? Before and after imagery of a dam failure: what should you actually look for? Why is Google Earth imagery of some cities years newer than imagery of others? How do you date a satellite image when the web page gives no capture date? Which national aerial imagery portals are worth using for free high-resolution photos? How do you georeference a scanned aerial photograph from the 1950s? How do you spot a newly built structure in two images taken at different times? Passive vs active remote sensing: what is the practical difference? What is the practical difference between a satellite image and an aerial photograph? Landsat or Sentinel for a thirty-year land cover study: which archive fits better? Can illegal logging really be caught from satellite pictures alone? What do the individual bands of a Sentinel-2 image actually measure? NDVI explained: why does the vegetation index mislead during a drought? What are the limits of catching small-scale illegal mining by satellite? How does hyperspectral imaging identify minerals from orbit? How is land surface temperature retrieved from thermal infrared bands? What can radar see through cloud that an optical sensor cannot? Why does spatial resolution matter more than spectral resolution for mapping cities?