Acuvec offers a full line of Photogrammetric Data
Processing services with fast turn-around, competitive pricing and outstanding customer
Following Photogrammetry and Data Processing Services are provided
- GPS Control Survey
- Aerial Triangulation & Adjustment
- Stereo Compilation
- DEM and DTM Generation
- Orthophoto Generation
Aerial Photography Ground
Ground control surveys are carried out by our Land Surveyors using Trimble dual frequency GPS
Ground control survey is performed to meet the client's specifications and required
accuracies. We also use of our relationships across the globe to have GPS Control done by the local GPS
mapping companies to client specifications.
Aerial Triangulation &
Aerial Triangulation (AT) is an essential part of any successful photogrammetry project.
Acuvec offers complete softcopy aerial triangulation services, providing highly accurate control for the map
production. Digital images are uploaded into softcopy workstations. The airborne GPS coordinates and the
ground survey control points are used to control the triangulation solution.
Acuvec utilizes Inpho's MATCH AT Software and
Leica Photogrammetry Suite to perform aerial triangulation computations and analysis. The selection of AT software
is dependent upon the size of the project and client requests.
Accuracy of the AT will be verified by the inclusion of checkpoints with the values withheld
in the adjustment and later verified in the final results. The following documents would be required for
executing the Aerial Triangulation process
- Line map of the project area showing flight lines.
- Project boundaries.
- Control point locations and identification numbers.
- Description of Ground Control Points with coordinates.
- Estimates of horizontal and vertical accuracy of Ground Control Points.
- Camera calibration report.
- Technical specifications.
The final Aerial Triangulation results are used for achieving the orientation of stereo image
pairs. This enables us to perform further processing for the vector feature extraction by utilizing softcopy
Acuvec provides accurate digital vector
extraction in industry standard formats by employing project specific procedures which deliver exceptional products
at cost-effective prices and quick turnaround time.
The Digital Terrain Model (DTM) plays an important part in the production of geo-referenced
orthophotographs. Acuvec conforms to the proper usage of hard and soft breaklines in
all its DTM editing assignments. This produces a very good terrain representation resulting in superior
A sufficient amount of height information is gathered from the photogrammetric restitution of
spot heights and breaklines in aerial photos (vector data) or from laser scanner mapping to acurately
generate the Digital Terrain Model (DTM).
Using the photogrammetric software a dense point cloud of heights is generated in multi images
through automated elevation collection (correlation). The results are verified manually by using powerful
editing tools. Elevation points on man-made structures or vegetation can be eliminated and gaps filled. As a
final step the DTM is generated.
An orthophotograph is a an aerial colour photograph geometrically and geographically corrected
to be superimposed on a plan. The production of orthophotographs consists of correcting the distortions of
the exposures caused by ground surface relief. This is possible because of the parameters generated by aerial
triangulation, the DTM. and the ground control points. These rectified images preserve all the detail of the
aerial photo and form the basis for a complete Geographical Information System (GIS).
Acuvec uses PCI's OrthoEngine, Orthovista and
SOCET SET for orthorectification of both scanned film and digital aerial photographs to produce map-quality ortho