The use of control points to transform aerotriangulated photograph blocks has been extensively used in photogrammetry. However, it is sometimes difficult or simply impossible to take measurements to obtain coordinates on photo-identifiable objects. The direct referencing process allows, at least, to reduce the number of control points and, in some cases, to completely do without them.

Learn how to perform photogrammetric processes based on the direct referencing technique using UASMaster and TBC.

Tools reviewed

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00:21 | Importing GNSS aircraft data (forcing kinematic) 00:39 | Importing ephemeris from the internet (only when exclusively importing observation GNSS data)

01:04 | Defining GNSS processing style

01:13 | Processing GNSS baselines

01:32 | Exporting trajectory

02:02 | Changing time format

02:38 | Interpolation of positions

03:42 | Defining a project for UASMaster

03:53 | Defining coordinate system

04:05 | Sending project to UASMaster

04:40 | Importing photographs

05:26 | Reviewing the type of photographic sensor

05:41 | Importing precise photograph positions (incomplete pose)

06:49 | Defining the precision for photograph positions

07:18 | Entering flight altitude

07:28 | Defining flight lines

08:08 | Extracting tie points

08:31 | Calculating external orientation

08:47 | Creating processing report

09:14 | Radiometric optimization

11:20 | Obtaining point cloud

12:18 | Generating orthophoto

13:25 | Sending final products to TBC