Once the survey area has been determined, the photo flight is prepared using a flight planning software that automatically generates the flight lines according to the required resolution and overlap. If available, the digital terrain model of the area is also inserted in order to maintain the resolution and avoid gaps in the overlap.

 

The flight planning is important for selecting the appropriate location of ground control points and their quantity depending on the methodology and the accuracy required by the project.

 

Quantity of photographs, digital storage space and time to complete the project is computed.

 

The photo flight parameters are carefully verified before handing the data to the flight crew. These parameters can be sent electronically via internet.

 

The number of GPS base stations are estimated depending on the methodology and the required accuracy of the project: we can use classic or more advanced techniques such as Precise Point Positioning or Omnistar real-time GPS differential corrections.

 

 These latest techniques allow the use of near zero ground control points in areas where access is impossible.