hi everyone, i need to understand how can i create a precision path for the following project.

usually we flying creating project inside dji app, with fingerdraw line and set area to survey with lidar.
now i'm facing projetc that need high accuracy.
we need to fly over the border of a big lake. we need only the border. but beside lake start mountain rise, and we need to fly in a stripe that will be 30 mt X 5 km.
obviosily that we break up fly in 2 time.
what is better workflow, path setup, not by finger on dji pilot app.
and also, better question, DSM files on AGL mode is so good on dji pilot APP ?

thanks
bruno

1/ Draw KML on your favorite GIS according to the lake border.
2/ Create corridor mission -> import the KML
3/ adapt setting to get the desired parametric.

A DSM is not required since the lake is supposed to be flat.

Which payload will you work with ?

LV_Forestry Posted at 9-24 10:45
1/ Draw KML on your favorite GIS according to the lake border.
2/ Create corridor mission -> import the KML
3/ adapt setting to get the desired parametric.

We're  using L2.
Could be Dsm required because border lake is beside climbing hill ?
So L2 requires two way , forward and reverse for having more dense cloud density.
We are scared  about possibilities for drone to strike mountain.

bruno.campi Posted at 9-24 13:20
We're  using L2.
Could be Dsm required because border lake is beside climbing hill ?
So L2 requires two way , forward and reverse for having more dense cloud density.

If the trajectory is well established, the RTH cases well anticipated, there is no reason for the drone to hit the mountain.

Maybe you can tell us which lake it is, it would be easier to appreciate the level of complexity of the task by seeing its geography.

in my case complexity is establish the trajectory
you can follow the lake in google maps.
lago di Corlo is its name

https://www.google.it/maps/@45.9633291,11.7720412,5010m/data=!3m1!1e3?entry=ttu&g_ep=EgoyMDI0MDkyMi4wIKXMDSoASAFQAw%3D%3D

i need to follow only the border, with a survey strip of 30mt.
planning is to fly about 180 mt, and in theory no need more preoccupation, but i'm not true because in some path you cannot see drone flying, mountain is nearest to the borders.   
yesterday evening planning corridor with UGCS, in fact i'm trying to establish corridor because first time that use UGCS.
its not hard but need some attention.

whats your idea ?

bruno.campi Posted at 9-24 22:48
in my case complexity is establish the trajectory
you can follow the lake in google maps.
lago di Corlo is its name

Ok I see.

If you need 30 m, I would put the Lidar at least 50 m above ground, especially not 180m, and I would follow the shore, in a single pass non repetitive scan pattern. 3 returns.

And given the distance I would think about moving by boat to respect the VLOS.

Forgot about UGCS, the task is too easy to bother with that.

50 m above ground is too low. hill is too nearest as you can see on right side of the lake
boat is not allowed in this lake, we need to stay on left road side, opposite to hill.
we need to diviode survey in 4 parts, two rigth side and two left side.
difficult is draw border line on hillside, so we need to fly height to reduce flytime and hill risk.

bruno.campi Posted at 9-25 00:01
50 m above ground is too low. hill is too nearest as you can see on right side of the lake
boat is not allowed in this lake, we need to stay on left road side, opposite to hill.
we need to diviode survey in 4 parts, two rigth side and two left side.

Well I would do it like this. You are not obligated to. From my point of view 180m will dilute point cloud density and could alter precision. Also 180m AGL is above A3 restrictions.

50 m is a minimum, I doubt that the flight planner allows below 70m for a linear mission. Do you have the DSM or DTM? I can make you a flight plan if you are interested.

This is interesting. Following!

Might be an obvious answer, but why can't you just crop the output to the desired area in post-processing? Set the mission with a small margin, it doesn't really matter if you collect data outside of the lake edge, as you can sort that afterwards. Maybe I'm missing something though!

we have planned all fligh situation. 9 flights in total, and previous with a flight level above 150 meters. drone anticipate, as said Forestry. we dont know how rtk anticipate trajectory, but at speed about 3/5 m/s we can control all telemetry and fly is safe.

Under which operational authorisation are you flying? Also flying above 120m 'll add noise/imprecision to your Lidar capture ( especially with the L2 ).