Understanding aerial mapping with the
swinglet CAM
Activate the 3D mission planning feature by selecting the ‘Use elevation data to
set absolute waypoint altitudes’ parameter in the ‘Mission Planning’ tab. Elevation
data is used to adjust every mission waypoint altitude as follows:
1. The flight planner uses elevation data to find the maximal terrain elevation
under the current waypoint, the previous waypoint and the flight line that
connects the two.
2. This maximum value is increased by the target altitude value, and the result
is set as the altitude of the current waypoint.
The altitude of every waypoint can always be manually adjusted in the Mission
Waypoints tab. By default, the ‘Change altitude’ parameter for the first mission
waypoint is set to ‘Keep highest’. For all other mission waypoints the ‘Change al-
titude’ parameter is set to ‘Before transit’ so that the drone climbs or descends to
the altitude of the next waypoint (and thus the next flight line) before transiting
and taking pictures.
It is important to understand that even if each flight line can have a different al-
titude, the altitude is constant along a given flight line. If the terrain altitude is
uneven along a flight line, the resulting imagery will have varying ground resolu-
tion and overlap. When the mission planner computes the altitudes of flight lines
it tries to ensure that the required amount of overlap is achieved, possibly lead-
ing to a lower ground resolution in some areas. During flight planning the range
of ground resolution computed by the mission planner is displayed. For optimal
results, it is best to set the orientation of the flight lines as parallel as possible to
the terrain’s contour lines.
One way to increase the resolution and accuracy of the elevation data is to fly a
first mission at high altitude and then create a dataset using
Postflight Terra LT
.
You can then automatically import the data into
eMotion
by selecting ‘Send DSM
to eMotion’ from the ‘Process’ menu within
Postflight Terra LT
. The dataset can
then be enabled using the
menu in the Toolbar.
eMotion
will use this custom
dataset (wherever it is available) to set waypoint altitudes instead of its default
Improved SRTM elevation data.
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Summary of Contents for swinglet
Page 1: ...Extended User Manual swinglet CAM Revision 12 September 2014 Copyright 2010 2014 senseFly Ltd...
Page 13: ...6 5 Charging the remote control 112...
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Page 49: ...Part II Advanced functionalities...
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Page 115: ...Part III Maintenance Repair and Troubleshooting...
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Page 149: ...Part IV Speci cations...
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