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Overseas Project

  The Application of MapMatrix in Project Zihuatanejo

 

Project Overview:

Zihuatanejo is a port city in the southwest of Mexico, adjacent to the Pacific Ocean, is the hilly landform.

SCT Company in Mexico used 3DAS1 true color three linear array camera to get images in Zihuatanejo surveying area. There are three adjacent flight lines, the ground resolution is 0.2m. 

Project Basic Requirements:

Using few GCPs to eliminate GPS/IMU inherent error and drift error to generate one-level images in this area, and inspect the mapping accuracy of other GCPs, then generate DEM and DOM in the whole surveying area.

Technical Features:

3DAS1 is three linear array camera, in order to generate stereo model for stereo mapping, aerial triangulation for linear array images is necessary, take use of three-perspective tie points and few control points to eliminate GPS/IMU error. Besides, zero-level images exist nonlinear deformation, zero-level images cannot be used in matching and stereo mapping, so the function to generate one-level images must be provided. There are some hilly areas with large elevation difference, the approximate epipolar lines can't fit the projection error in directiony, so matching method needs to be adjusted accordingly.

MapMatrix new digital photogrammetric platform provides 3DAS1 data aerial triangulation module, one-level images generation module and matching module. After aerial triangulation, the error of checking points in the whole surveying area is less than one pixel, meeting the accuracy requirement and get the high evaluation of users.

 

 

 

  Hydropower Station S&M Project in Pakistan

As the largest photogrammetry and remote sensing software supplier in China, Visiontek actively respond to national strategy "The Belt and Road", taking part in basic S&M projects in countries along the route.

In year 2015, Visiontek took part in the hydropower station S&M project in Pakistan, needs to do 1:10000 topographic mapping for the area surrounding hydropower station and the region along rivers. Visiontek took use of the lastest satellite images to collect total factors in MapMatrix digital photogrammetric platform, and the finished 1:10000 DLG production, providing effecitve basic S&M information for the project.

Visiontek has advanced photogrammetric remote sensing software and owns a rich experienced data processing team, providing timely S&M information for "The Belt and Road", and could provide high accuracy and high efficiency photogrammetric RS service.