By this time, he had cut down on surface variations in his paintings to avoid light reflecting on different patches of paint. (en.wikipedia.org)
This leads to a very slight cooling of the surface relative to the satellite record adjusted to surface variation levels. (climateaudit.org)
But when prospecting for new finds, they're more likely to use tools such as hyperspectral imagery, which can find electromagnetic fingerprints of objects and land features invisible to the naked eye, or light detection and ranging (LIDAR) technology, which maps subtle surface variations with extreme accuracy. (discovermagazine.com)