classical definition of orthophoto is the conversion of a central projection
(the photo) to an orthognal or parallel projection (the plane). Orthophoto
images are derived from conventional vertical aerial photography by rectifying
the distortion caused by ground relief and camera tilt.
uses the most recent method of orthophotos production comes from scanned
images which are rectified via the photogrammetri softcopy workstation,
where a scaled Digital Terrain Model (DTM) is created to establish precise
positioning of individual pixels. The final rectification is completed
by draping the entire scanned image over the DTM.
resulting orthophoto is delivered in hardcopy or electronic formats, the
resolution is determined by pixel size, a smaller the pixel will generate
a larger file:
Size in MB
can provide orthophoto data at additional cost for any part or all of
your project area. Due to the vast volumes of data required for orthophotos,
care must be taken to prepare storage to accomodate it.