Photogrammetry

WET has immensely qualified, well trained group to provide the full range of digital photogrammetry services and solutions –  one of our prime focus areas in geographical services. We also have a group of highly qualified, well trained and skilled specialists who use the latest equipment and software available to provide the entire range of services in digital photogrammetry. These include:

Aero-triangulation

Aerial triangulation techniques are used to combine the short-term accuracy of the IMU with the high global accuracy of GPS. In combination with a minimum number of ground control points, aerial triangulation delivers best fitting results on the ground. The extra information added to the system by automatic tie point measurement (APM) leads to very reliable orientation results where photogrammetric measurements serve to control IMU/GPS measurements and vice versa.

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Orthophoto Generation

WET specialises in high-resolution orthophoto imagery production. An orthophoto is an aerial photograph that has been geometrically corrected or ‘ortho-rectified’ such that the scale of the photograph is uniform and utilised in the same manner as a map. An ortho-photograph can be used to measure true distances of features within the photograph. An orthophoto is an accurate representation of the Earth’ s surface. Orthophotos have the benefits of high detail, timely coverage combined with the benefits of a map including uniform scale and true geometry.

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DTM /DEM/Digital Surface Model

Data acquisition for developing of the Digital Terrain Model (DTM) is made by 3D photogrammetric data acquisition from aerial images (stereopairs). It is a collection of discrete elevation points at regularly spaced intervals. The model reflects abrupt changes in relief such as incised streams, ridge lines, and slope breaks. Digital elevation models are used as the basis for the elevation representation by contuor lines and height spots on topographic maps, as one of the input items for making a digital orthophoto and as the final product under the specifications

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3D Vector Mapping/ Planimetric mapping

3D Planimetric/Topographic mapping mainly represents the earth surface features in 3D manner using Line, Point/Symbol and Polygon/region data. With this 3D Vector data user can make different analysis and decisions based on their specific need and applications

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