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Topics - FrostBite

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1
General / Issues Classifying Ground Points
« on: December 16, 2024, 08:03:43 AM »
I'm trying to classify ground points to make a high quality DTM. For some reason the 'Classify Ground Points' function doesn't get all points on the ground. Some rocks and logs that have a steep angle don't register as ground. The next thing I would do is select all the unclassified points and call them high vegetation (since this is a forested area), but this would mean that some of the ground would be also called high vegetation.

I've tried a few different iterations but I still haven't achieved a good result.

What do you all do in this situation? Does it really matter that much? I am not sure what the best course of action is!

I attached a screenshot of part of the ground.

2
General / Issue Converting Coordinates
« on: December 15, 2024, 09:59:05 AM »
I have flown an area and collected about 1400 images.
When I upload to Metashape and try to convert the coordinate system from WGS to UTMs, the whole dataset shifts about 20° to the East.
Does anyone know the solution for this?

I'm using a Mavic 3 Enterprise for mapping.

Thanks in advance!

3
General / M30T & M3E Questions
« on: October 31, 2023, 07:51:19 AM »
 I'm interested in purchasing the DJI M30T or DJI M3E for mapping with RGB and Thermal.

I'm curious to know everyone's input! I've been using an older drone, and am looking to upgrade.

1) Does the DJI Pilot 2 app allow for mapping large areas with large variations in terrain? I ask only because the Drone Deploy app only allows the use of terrain awareness with areas under 200 acres.
2) How much actual flight time do you get, on average, with one battery, with either drone?
3) Is the M30T a good drone for creating orthomosaics and 3D models of large areas?? I've been reading that it isn't suited for those kind of missions
4) I'm reliant on using terrain awareness for mapping areas with large variances in terrain (mountainous). How hard is it to import the DSM from 3rd party websites into the DJI PIlot 2 app?
5) Does the speed of the mapping mission get reduced or increased based on shutter speed/low light?
6) Would the RTK system on the DJI M3E work when I'm outside of cell service? Do I need a base station for it? Or does it give better location information on its own?

Thanks for any and all input!

4
General / Drone for Mapping?
« on: March 27, 2022, 09:18:31 PM »
 I am looking at upgrading my drone for mapping, but I'm not sure what I should be looking at.

Does the Mavic 3 Pro do well with mapping? I was interested in the portability of the drone.
Is the Phantom 4 Pro still good for mapping missions?

I was looking at the P4Pro RTK system. But I think that's out of my price range...

Thanks!


5
General / Drone + GPS unit? (GCPs)
« on: March 27, 2022, 09:16:16 PM »
 I wanted to get some kind of GPS unit for getting better data through Ground Control Points.

I was wondering what you all would recommend for a cost - effective setup.

Is there some kind of antennae I can sync to my phone with an app? Like SW Maps?
Or would I have to buy a whole antennae + GPS unit setup?

What do you all recommend?

Thanks!

6
General / UAV - How can I show slope
« on: October 07, 2018, 03:39:36 AM »
I flew a fairly steep area that will eventually be logged by a local mill. I created a good orthomosaic and DEM from the photos. The photos penetrated the canopy enough to extrapolate the ground information for DEM.

So now the client now wants slope % information so they can prescribe specific machinery to log in this area.

I have Global Mapper, and have come up with a really basic photo to show the slope. I just don't think it's enough data to present to the client.

Could anyone please give me some advice on how I can best do this? It could be a gamechanger for me to do this properly.

Thanks!

7
General / UAV Data - Bounding Box/Orientation Issues
« on: September 29, 2018, 08:14:20 AM »
  For some reason, after I align the images, orientation of my model is incorrect. It's as if the X and the Z axis switched over.

Since I'm using geotagged images, shouldn't it automatically have the correct orientation?

I did change some settings when I tried out a new workflow that could have possibly changed PhotoScan to do this. I've been slowly trying to fix it but I was wondering if anyone had any ideas to speed up the process?

Thanks ahead of time!

8
General / Fly-through feature
« on: December 22, 2017, 09:59:00 AM »
 Hello all, was just wondering if anyone has learned how to properly use the flythrough feature?

Is there a tutorial anywhere??

9
General / New Video Card = Photoscan Crashing?
« on: May 12, 2017, 02:43:45 AM »
 I recently bought a GIGABYTE AORUS GeForce GTX 1080 Ti Xtreme Edtion 11GB Video Card - 1721/1607 MHz.
Before I had a Geforce 570, so I was hoping it would help with larger amounts of pictures in Photoscan.

The problem is that Photoscan will unexpectedly crash in the middle of different processes. I started a new project and it crashed while generating the dense cloud. And then I opened an existing project that already had the dense cloud created, but Photoscan crashed when I was classifying the ground points.

In other software, such as Adobe Premiere, it seems to be working fine. So far I'm having too much trouble for the money I put into this video card.

Does anyone have any suggestions?? I did check in 'Preferences' and my video card is selected there.

10
General / Merging Chunks
« on: April 30, 2017, 03:49:26 AM »
 I am having problems with merging chunks.

I have a total of approx. 2000 photos. I broke them down into 4 chunks (so 500 photos each). Everything worked properly, the only problem is that when I tried merging two of the chunks together, one was higher (elevation-wise) than the other.

How do I remedy this? Should I simply merge all chunks together at once? Or one at a time?

11
General / Problems with Merging Chunks
« on: October 31, 2016, 10:59:23 AM »
 I have four chunks that I've been trying to properly align and merge together. Each chunk is basically a square that consists of approximately 700 images. The first three chunks of images were done about 2 months ahead of time in comparison to the 4th chunk. When I look at the point cloud of all the chunks together I noticed the 4th chunk (the one taken 2 months later) is 'lower' in elevation in comparison to the other three. The result is the orthophoto turning out bad. Some of the areas have doubles (houses, buildings).

Does anyone have an idea of how to merge the point clouds so the elevation is the same?? Is there something wrong with the meta data from the images??

Any help would be appreciated!

12
General / Ortho Cropping and Post Agisoft?
« on: May 25, 2016, 06:45:34 AM »
 Quick questions...

I was trying to find a way to crop the orthomosaic in Photoscan. I trimmed the sparse and dense cloud but I still get the excess part of the ortho I wanted to clean up. Or do I use different software for that part?

Also, to showcase dense point clouds to be viewed by clients, what software/website is best? Some LAS files I have are about 10GB.

Thanks!

13
General / Spherical pano WorkFlow problems!
« on: April 03, 2016, 11:16:36 PM »
 I made a half sphere panorama with my UAV. I am trying to stitch the photos together as instructed in the tutorial:

http://www.agisoft.com/pdf/PS_1.1_Tutorial%20%28IL%29%20-%20Spherical%20panoramas%20generation.pdf

I think the problem is when I try and put them into a group and afterwards try to align them. After the process they don't show up at all. The cameras OR the sparse cloud. If I do not group the photos and just run a regular alignment then it works (I see the cameras and the sphere they produced) but I can't 'Export Panorama'.

Does anyone know what I'm doing wrong?? The instructions are really simple and I followed them repeatedly.

Thanks ahead of time!

14
General / Building Orthomosaic for Forestry
« on: March 29, 2016, 06:50:59 AM »
  I've been working on a few sets of images I've collected at different overlaps and altitudes. I have that part mostly figured out, but when it comes to post processing I wasn't too sure how important building the dense cloud is. Does anyone have some advice on the workflow?? I have imagery from 70% overlap up to 90%. I think 70% is just fine though. I've been building the dense cloud with the highest settings but I'm not sure if it's necessary. I've been told that building texture isn't recommended either and it seems to work without.

Does anyone have some tips?

15
General / Post Processing Software?
« on: March 24, 2016, 09:57:30 AM »
 If I do an orthomap or create a 3D terrain model what software is good to use to make a video flythrough and volume measurements etc.?

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