Geodata acquisition

11085076_814934278588021_1669929165_nGeodata acquisition is a favourite practical course.

The first task was collecting a data of infrastructure within the area of interest 500*500 m using a Real-Time GNSS device. Then collected data were processed in Pathfinder Office.

Photogrammetry:

The main objective was to generate Digital Surface Model, mosaicked orthophoto and law density point cloud, using 11 areal imagery of Salzburg city. Firstly we measured ground control points (GCPs) with GNSS using RTK. After measurements these GCPs were transformed into local (austrian) coordinate system as MGI BMN 31 (Bundesmeldenetz).

DSM extraction was processed within ERDAS IMAGINE commercial software, where main steps are:

  • creating photogrammetry model
  • defining camera parameters: exterior and interior orientation
  • measurement of Ground control points, Tie point generation
  • aerial triangulation

Result of DSM generation:

dsm2m_peri

DSM needed for generation of mosaiced orthophoto:

3d_overview

 

 

 

 

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

w

Connecting to %s