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Unable to load DSM onto Ground Station
552 12 9-18 15:23
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K1_Survey
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Flight distance : 2933 ft

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Hi,

I have set up a SD card dith DJI/DSM with a tiff and tfw file in it. The Tiff is in Geographic coordinates (WGS84/EPSG 4326) heights are also ellipsoidal. The file will not show up under "DSM file".  I have tired with SRTM 1' data, previous survey re-sampled to 1m,5m, and 10m and with ASTER DEM v2 and all will not show up. Has anyone had this problem? SRTM file attched for if anyone can figure out if I am doing something wrong. If anyone could upload a file that has worked for them I could test if it is my file creation process or a problem with the ground station that would be awsome.


SRTM_WGS84.zip

94.1 KB, Down times: 3

SRTM_DSM

9-18 15:23
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DJI4Survey
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Hey mate,

Are you putting the .TIF and the .TFW in a sub-folder under DSM?

Should be DJI/DSM/New Folder/.TIF and .TFW.

Let me know
9-18 17:04
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K1_Survey
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DJI4Survey Posted at 9-18 17:04
Hey mate,

Are you putting the .TIF and the .TFW in a sub-folder under DSM?

Hey mate cheers for the reply

Just gave that a shot and unfortunately they still don't show up.



9-18 17:28
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DJI4Survey
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Hmmm. What software are you using to export your .TIF?
9-18 19:56
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K1_Survey
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Flight distance : 2933 ft

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DJI4Survey Posted at 9-18 19:56
Hmmm. What software are you using to export your .TIF?

The SRTM data was extracted from ELVIS (Geoscience Australia) then I produced the tfw in QGIS (GDAL). I tried Global Mapper as well.
9-18 20:42
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jivago
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Flight distance : 23671 ft
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DJI4Survey Posted at 9-18 19:56
Hmmm. What software are you using to export your .TIF?
check out Global Mapper software.

that's good enough for downloading SRTM data based on arbitrary area.
9-19 01:22
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thunr
lvl.3

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Have you tried using a smaller DSM? I remember reading either here or on Aerotas that the RTK doesn't play nice with large DSMs. The biggest one I've used is ~800 meters square and your's is almost 5000 meters square. I don't know what the cutoff would be but it's one of the things I've been curious about.
9-21 08:44
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patiam
First Officer
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what thunr said. not just total area but resolution. try dumbing it down and/or reducing area and see if that works.
9-21 19:50
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DJI4Survey
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I loaded a fairly large site and had not issues.  700ha.

When using global mapper to export, make sure you are using the 32 bit Float point samples.

9-22 16:10
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djiuser_h88e04BRiYsL
lvl.1

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The version of this firmware is V 02.02.0014. It raised an error when I try to import two files to the DSM folder. This DEM is upgraded from previous version. What I am thinking is that the new version doesn’t allow DSM import using the old way.
9-24 06:22
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djiuser_h88e04BRiYsL
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9-24 06:43
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BlakeTHaAussie
lvl.1

Australia
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Is your folder the same name as your DEM file?
10-18 20:37
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Luchin
lvl.1

Peru
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Amiguitos buenas tardes... recien adquirí un P4 RTK... a ver si me ayudan a volar en modo terrain por favor,  yo hago los siguientes Pasos:
Primero: creo un kmz en google earth
Secundo: abro el Global Maper configuro a UTM y zona WGS 84 18S
Tercero: abro el kmz
Cuarto: genero curvas de nivel
Quinto: exporto a geotiff marcando al check de tfw
Sexto: traslados los los archivos el tiff y el tfw a una micro para luego llevarlo al dron en la siguiente L:\DJI\DSM\Test 1
Septimo: ya en el control del dron selecciono modo terrain y todo y al momento de crear el polígono de vuelo me sale el error “FAILED TO OBTAIN ALTITUDE DATA. ADJUST WAYPOINT”
10-21 15:29
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