Forum

Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.


Messages - metaMick

Pages: [1]
1
General / Re: Anybody have any tips for DEM building?
« on: August 08, 2019, 03:05:57 PM »
To narrow things down, I would undertake 2 sets of flights on the same day and do the comparison using exactly the flight plan, same day, same GCPs and metashape settings. So the only variable is the images. I wonder what sort of discrepancies you will get and how the size of those discrepancies will compare with your week to week comparisons. I would ensure the imagery was being taken on a wind-free days.

2
General / Re: Contours not correct from aerial images
« on: July 27, 2019, 12:34:11 PM »
Quite possibly. I though the idea of giving the cameras low accuracy and the GCPs high was so that the results were biased towards the GCPs. Is this not how it works?
Cheers
Mick

3
General / Contours not correct from aerial images
« on: July 27, 2019, 07:11:37 AM »
Hi,
I have 87 vertical aerial images of a very flat field taken from a drone at an altitude of around 40m. I have 6 GCPs spread around the site surveyed by RTK GPS (+/- 10mm). The maximum elevation difference between the GCPs is about 150mm.
The photos align well and I have optimised cameras based on the GCPs. The model looks visually correct.
When I generate contours, I find that I get a 3m elevation contour difference over the site, so about 20x what I'm expecting.
Where could the issue be?
Thanks
Mick

Pages: [1]