LIDAR

https://www.ars.usda.gov/is/pr/2010/100609.htm

LIDAR or Light Detection And Ranging, is a remote sensing tool that uses light and lasers to map different geographical areas. Measuring the distance from the laser with light helps them detect the different variables they are trying to find. LIDAR is used all throughout science, in geology, forestry, remote sensing and geomatics. The above LIDAR map is of the agricultural yeild possibilities of a piece of land.