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Photogrammetry.

SSGIS Team has a specialized Photogrammetry division which focuses on (UAV Data collection) and Photogrammetry Data processing.
  • Aerial Triangulation
  • Image Processing
  • Terrain Modelling
  • Orthomosaic
  • 3D Modelling
Photogrammetry involves various stages of data processing, in which Aerial Triangulation is the very first process done on the raw data. Aerial Triangulation is the process of assigning the ground control points (GCP) to the aerial photographs thereby orienting and aligning the photographs to the exact global coordinate system. Aerial Triangulation is also done to correct the exterior orientation parameters. Given the orientation parameters, GPS points and flight details, our team will prepare AT and block adjust the imagery. The process of aerial triangulation includes,
Establishing Ground Control points
Interior Orientation
Tie Points measurement and transfer
Control point establishment on photographs
Block Adjustment
Image processing is one of the pre-processing steps done for all the images captured by photogrammetry method. The raw aerial images collected from the field by drone/UAS or any other Aerial survey methods will have some noise or distortions due to environmental and other factors. The images are rectified by proper image processing techniques and software to generate the aerial imagery for optimal production. The images are then color balanced and enhanced for better visualization, analysis and geographic context. We provide the following image processing services,
Orthorectification
Mosaicing
Feature Extraction
Topographic correction
3D generation
The topography of the earth surface is quite complex. Information about the terrain is very important for all projects dealing with the Earth’s terrain. Terrain models are created for infrastructure projects as a part of feasibility study. The real world topography of the terrain can be acquired by precise surveying and data collection techniques. In photogrammetry DEM (Digital Elevation Model) is created from the aerial imagery by accurate height information and generation of break lines from the imagery. SSGIS team expertise in creating accurate break lines and generate terrain models like,
DEM (Digital elevation Model)
DTM (Digital Terrain Model)
DSM (Digital Surface Model)
Contour generation
The acquired model is further used in rectifying the imagery and preparation of ortho imagery.
Orthorectification is the process of rectifying and correcting the aerial imagery as per the real world topography or terrain model by removing the distortions caused by noise, camera positional error and terrain relief. Planimetrically correct images are generated with respect to client’s input and camera parameters. The rectification’s accuracy also depends on the density and accuracy of the Ground Control Points collected from the ground and the accuracy of the DTM (Digital Terrain Model) generated. SSGIS team is specialized in generating Orthophotos and Orthomosaic for various photogrammetric projects. The resulting orthophotos are delivered to the client in their preferred formats.
SSGIS provides 3D modeling services for clients worldwide. Buildings and other topo features will be modelled in 3-dimensional space as per the detailing required by the client. Photogrammetry technique and special software are used to model accurate 3D models from the obtained aerial imagery. The generated 3D models will have precise height or elevation information. Thus the 3D model data are widely used in many domains like,
Smart cities, for Navigation
Location based services
Disaster Mitigation and Management for Planning and decision making
Change detection studies etc.