Linear mapping using Terrain Awareness suggestions

Hi guys, I am new to this app that I have just purchased, so far I think it is the best app out there, so thank you to the developers with all your hard work.

I have a job coming up where I have to map out a couple of roads from 3km to 17km. The project main objective is to obtain accurate elevation data.

I will be using GCP in my project, however I am not sure if it is better to fly with, or without terrain awareness for the best results. At the moment we are not sure what the change of elevation of the site is and we will only know once we get on site.

Any suugestions is greatly appreciated.

Regards, Ruan

Ruan Benson 08:06 Ngày 01 tháng 12 năm 2017

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You will not be able to get super accurate terrain data for a long thin linear mission with most softwares (including Maps Made Easy).

It is not uncommon for elevations to change slowly over long distances like that and it can really add up. If you fly at 60m above takeoff and fly 5km away there is little chance the elevation will be the same height and the aircraft will be further from or closer to the ground. This will affect the consistency of the overlap you get and likely cause issues. Using Terrain Awareness would address this issue.

Zane 23:38 Ngày 01 tháng 12 năm 2017

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So, are you saying that you CAN get correct elevation data over long distances if you use Terrain Aware? I am having this same problem on the last two surveys that I made. I want to know if I go back and reshoot them with Terrain Aware, will they be accurate? There is a large expense and time commitment to get back there and reshoot them, so I want to make sure it will be worth the effort.

Kevin Foley 17:01 Ngày 15 tháng 05 năm 2018 0 bình chọn

It helps. Consistent overlap is key and Terrain Awareness fixes the wild swings in overlap as the terrain changes. There will always be sources of error and they will get worse over large distances. Think of it as X inches of error for every hundred yards. It adds up over time.

Using lots of overlap and keeping it consistent is the best thing you can do.

Our new manual rereferencing workflow is currently only offering a linear offset but we hope to correct for spherical distortion in the near future.

Zane 21:41 Ngày 15 tháng 05 năm 2018 0 bình chọn

So, if I were to go back and shoot it with Terrain aware.. are you saying if I broke it up into a bunch of pieces over the 2 mile total shoot, it would be much better? Should I do ground control points? They want to measure the current elevations and compare those same places quarterly over time. This is near a sinkhole site, so it would be critical that I always got the same elevations every time iif it does not move.

Kevin Foley 22:37 Ngày 15 tháng 05 năm 2018 0 bình chọn