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Orthophoto Production |
Digital orthophotos are proving suitable for a variety of mapping,
GIS and environmental monitoring tasks. Increased demand is sparked
by the availability of hardware and software suitable for use in a
desktop mapping environment. The transition to softcopy
photogrammetry has resulted in photogrammetric operations becoming an
integral part of geographic information system (GIS) database
construction tasks. In particular, digital orthophotos are now
recognized as valuable "base map" coverages that can be used to
identify ground control, update existing coverages for land use/cover
and transportation routes and assess changes in the landscape caused
by construction or environmental phenomena. |
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Orthophoto Production Methodology |
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Orthophoto production concerns the process of transforming the
central projection of the terrain as recorded in aerial photos in to
a digital geo-referenced image (orthophoto) with the same geometric
attributes as a map. This transformation from a central projection in
to an orthogonal projection requires a Digital Terrain Model(DTM)
with sufficient density and accuracy. |
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Our Expertise in Orthophotos |
Stesalit maintains a dedicated team conversant with global projects
and practices in Orthophoto production and orthorectification.
Each project follows the critical pathway of |
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Delivery |
Orthophotos are usually delivered as individual orthophoto map-sheets
with the georeferencing information in either the image file header
or in a sister text file.
Depending on size of the total project area and the specified
orthophoto ground resolution, sophisticated compression formats such
as ECW and MrSID often make it possible to deliver large project
areas in one single image file.
The delivery to clients is usually made on DVD/CD or external hard
drives from our Global Delivery Center at India. |
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