Orthorectification & mosaicking

Orthorectification is the most accurate method for airborne and satellite data rectification. Availability of accurate digital elevation model (DEM) and ground control points (GCPs) is a key prerequisite to get satisfactory results.
Data orthorectification is one of the most required services from our clients. We have managed not a few small and large, domestic and international projects orthorectifying all type of satellite or airborne images. Our experiences in this area and use of state-of-the-art software tools guarantee the delivery of the most accurate product according to the client requirements and quality of reference data available.
Mosaicking is usually the next processing step in case many satellite or airborne images cover large area to be processed. Production of seamless and color balanced product is the frequent requirement. Again, this is a routine but also not trivial operation Gisat has applied in many projects in the past.

• Rigorous or Rational Functions (RPC) based orthorectification

  HR & VHR satellite data, wide range of sensors, ...

• Block Bundle Adjustment

  to assure good overall accuracy, different satellite sensors in single block, implemented both for rigorous and RPC approach, ...
  

• Automation and batch processing

  automatic image registration, automatic GCPs and TPs collection, visual and command line scripting environment, ...

• Manual and automatic mosaicking

  image normalization, image “hot-spot” removal, mosaicking lines delivery, ...