The mapping process using UAV begins with a preliminary survey of the study location. The purpose of this preliminary survey is to determine the area of interest (AOI), to determine the location of taking off and landing, and the location of the Ground Control Point (GCP), to document the actual conditions of the activity location, to arrange for a flight permit, and to conduct field orientation to anticipate disturbances that may occur. may interfere with the UAV mapping process.
The next stage is making mission planning / planning the UAV flight path, using the drone deploy application. In the drone deploy application, UAV data acquisition in each location is in the same setting. As for the flight direction and flying speed of the UAV, each station will adjust the direction and speed of the wind. The higher the wind speed, the lower the UAV speed.
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After the UAV mapping survey is carried out, the next step is data processing. Photogrammetric processing of 2-D UAV image data using the Structure for Motion (SfM) algorithm will produce 3-D river topography data. The SfM algorithm can produce 3D maps by identifying the location, position and orientation of the image and then merging the dots in one image with another image that overlaps automatically. So that the resulting image is a combination of several smaller images (Snavely, 2008).
