dji Mavic 3M - Page 84

DJI Mavic 3M User Manual
84
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g. Flying over surfaces that strongly reflect or absorb infrared waves (e.g., mirrors).
h. Flying over surfaces without clear patterns or textures.
i. Flying over surfaces with repeating identical patterns or textures (e.g., tiles with the
same design).
j. Flying over obstacles with small surface areas (e.g., tree branches).
• Keep the sensors clean at all times. DO NOT tamper with the sensors. DO NOT use the
aircraft in dusty or humid environments.
DSM Follow
By importing the DSM file, the app will generate a flight with altitude changes. The DSM files
of the mapping area can be obtained using the following two methods:
1. Import Local File
a. Collect the 2D data of the mapping area and perform a 2D reconstruction using DJI
Terra by selecting Fruit Tree mode. A .tif file will be generated and can be imported
to the microSD card of the remote controller.
b. Download the terrain mapping data from a geobrowser.
2. Download from Internet
DSM files can be directly obtained by downloading the open source data of the ASTER
GDEM V3 geoid database.
• Make sure the DSM file is a geographic coordinate system file, not a projected coordinate
system file. Otherwise, the imported file may not be recognized. It is recommended
that the resolution of the imported file should be no more than 10 meters.
• Make sure that the mapping area is within the range of the DSM file.
The open-source geoid database may have errors. DJI is not responsible for the accuracy,
authenticity, or validity of the data. Pay attention to the flight environment and fly with
caution.
Linear Route
Linear Route is used to collect orthophoto for strip-shaped areas such as rivers, pipelines,
and roads. The mapping area can be generated by selecting the center line of the strip and
extending outward along this line.
First, set Flight Band by selecting points on the map to generate the band-shaped mapping
area, and confirm the center line and the scope of the mapping area. Switch to Flight
Route to generate the corresponding s-shaped route, and adjust the route parameters to
complete the setting.
Center line can be generated by tapping on the map or importing a linear KML file. Note:
after the band-shaped area is generated, check along the path to see if there is a large
deviation from the original mapping area. If there is a deviation, increase some points to
cover the area completely or increase the length of the left and right extensions to cover the
mapping area completely.