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1
General / DTM X DSM - orthomosaic precision
« on: June 16, 2020, 07:03:06 PM »
In order to measure buildings, do DTM and DSM have different accuracy? or just the view that sometimes DSM appears on a wall

2
General / diference in measurement on DTM and DSM.
« on: August 29, 2019, 04:28:14 PM »

Is there a difference in measurement (precision) when DTM is mosaic instead of DSM in an urban environment?

3
General / Re: What is the best way to align photos with GCP?
« on: May 27, 2019, 11:42:26 PM »
tks dor reply!

if my GPS has 0.2 m accuracy (example), I need to insert this into the "marker accuuracy"? what is marker accuracy (pix) and tie point accuracy (pix)? (I could not find it in the manual)

4
General / What is the best way to align photos with GCP?
« on: May 27, 2019, 02:12:47 PM »
What is the best way to align photos with GCP?

1 - Align in the low, insert the GCP, deselect the photos and select only the GCP and align again in the high.

2 - Align in high, insert the GCP, unselect the photos and optimize.

3 - Align at high, insert GCP and optimize alignment with selected cameras and GCP.

Ps: Drone without RTK, and GCP with RTK

5
General / Re: workflow for urban areas
« on: May 19, 2019, 03:24:38 AM »
Great answer, I'll look at it deeper. And for my case I only need  a orthosmosaic, do you have any tips or standard workflow for this?

6
General / workflow for urban areas
« on: May 17, 2019, 12:24:28 AM »
Does anyone have an workflow without distortion using DEM or DTM?

- Over / sidelap capture (in the log do I use height relative to the ground or change the height of the pixhawk?)
- Accuracy for alignment, densecloud
- optimization and cleaning

I'm exaltively testing but I never get to a perfect project or close to it.

I'm using a Samsung nx mini to capture the images

7
General / Re: Classification of ground points problem
« on: May 14, 2019, 05:21:29 PM »

I got a much better result now, I used:

Max angle: 10
Max distance: 2
Cell size: 50 m

Is there any formula or tips for using this tool for urban use?

8
General / Classification of ground points problem
« on: May 14, 2019, 04:40:22 PM »

I'm trying to generate a DTM to create an orthomotic, but some ground points in the dense cloud are not being sorted at all. By the way I realize they are a bit shifted down.

I'm using a new camera on a fixed wing, can it be something related to that? Does anyone have any suggestions for workflow or something I can try?


I used:

over/sidelap? 80 / 70
Picture Quality: 1.8>
Alignment: Medium (40,000 / 10,000)
Dense Cloud: Medium (agressive)

I was cleaned the sparse cloud with error on reprojection and accuracy


I already did another project and I never had this problem. Tks

9
General / Asign image and accuracy !
« on: March 12, 2019, 09:30:04 PM »

When I use the "assign image" tool to correct faults in the orthomosaic, do I compromise the accuracy of distances?
because some photos seem to diminish or increase the buildings

thaks :D

10
General / Orthophoto problem
« on: April 17, 2018, 06:34:21 PM »
Good afternoon, the orthophoto generated has some cuts, in the case below comes to cut a house.

I'm generating orthophoto from Dem (generated by the grounds points of the dense cloud).

PS: I'm not using control points, but I optimized the camera after it has aligned.

overlap 80% / 50%

Something I'm doing wrong? follows the settings used in the image.

11
General / Two questions - Number of Markers and Alignment
« on: December 17, 2017, 09:38:52 PM »
I have two questions regarding a large project.

I will make about 11 pieces of 600 32-megapixel photos.

1- By manual, I must have 10 accurate markers. Do I need 10 in the whole project or 10 per chunk?

2 - What is the best way to generate the final orthophoto (I am going to do from the DEM), what kind of alignment (for chunks) should I use or how should I do it? (is there any tutorial with this?)

Sorry my english :D

12
General / Re: Problem with builds in orthophoto
« on: December 07, 2017, 07:25:59 PM »
Thanks R2DS but i use 80% - 70% and got that result,
but Alexey Pasumansky's hint worked, I updated the photoscan and now in specific places (few) I can do manual handling: D

TKS ALL !!! :D

R2DS if i fly with 600m 80 /70 is better then fly 200m 80 /70 ?  tks again :D

13
General / Re: Problem with builds in orthophoto
« on: December 07, 2017, 03:38:52 PM »
1.3.2 build 4164 (64 bits)

its a bug on my photoscan?

14
General / Re: Problem with builds in orthophoto
« on: December 07, 2017, 03:11:58 PM »
Hello, thanks for reply, it happens that when I use Assign Image it is correct, when I click on "update orthomosaic" it comes back as it was before, is there any trick I'm not doing?

15
General / Problem with builds in orthophoto
« on: December 07, 2017, 05:31:17 AM »
I am generating the orthophoto from the DEM, but in higher buildings I have this problem, I have tried in several ways, but I could not find a solution.

Is there any tool that allows me to manually correct or some trick that does not work?

sorry my english :(

Tks

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