Remote sensing

acquisition of information about an object or phenomenon without making physical contact with the object, especially the Earth

thumb|right|Orthographic views project at a right angle to the datum plane. Perspective views project from the surface onto the datum plane from a fixed location. thumb|Aerophotogrammetry, orthophoto from unmanned aerial vehicle|drone, Città Alta, [[Bergamo, Italy.]] thumb|This photo is properly projected on elevation model, yet on a single building scale, a small tilt is noticeable. This is an orthophoto, but not a true orthophoto (not all vertical features are reprojected). thumb|This photo is assembled from several overlapping photos from UAV, completely removing any residual tilt of the bu

function of four real variables that defines how light is reflected at an opaque surface

Graphical indicator of remotely sensed live green vegetation

method of imaging using a wide range of wavelengths across the electromagnetic spectrum

REDIRECT Underwater acoustics

dimensionless quantity that characterizes plant canopies

region of rapid change in reflectance of vegetation in the near infrared range of the electromagnetic spectrum

process of collecting geospatial data from a mobile vehicle

method of imaging using a limited number of wavelengths in the electromagnetic spectrum

thumb|A mower with a scythe cuts a swathe through the crop. thumb|A mechanical swather. A swathe ( British English, rhymes with "bathe"; or swath American English, rhymes with "cloth") is the strip of cut crop made by a scythe or a mowing-machine. A mower with a scythe cuts a swathe along the mowing-edge leaving the uncut grass to the right and the cut grass laid in a windrow to the left on the previously mown land. The swathe width depends on the blade length, the nature of the crop, and the mower, but for grass is usually about wide. When mowing in a team the mowers start at the edge of a me

Earth observation technology

United States law