Very High Resolution (<2.5 m) Very Low Temporal Coverage (>annual)
An orthophoto is an aerial photograph geometrically corrected (“orthorectified”) to ensure the scale is uniform: the photo has the same lack of distortion as a map. Unlike an uncorrected aerial photograph, an orthophotograph can be used to measure true distances, because it is an accurate representation of the Earth’s surface, having been adjusted for topographic relief, lens distortion, and camera tilt. The image has been corrected to ensure that horizontal scale is constant
These data sets have a spatial resolution of 2.5m or closer and are primarily operated by Jurisdictions and/or commercial enterprises.
There are an increasing number of these sensors available for both satellite and airborne platforms and an ever-expanding range of applications that use them.