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1

General / Planar Orthomosaic Generation - Identical view angle selection between projects?

« on: March 10, 2025, 05:52:28 PM »

Hi all,

I have searched the forum but I couldn't seem to find this exact issue. I have multiple drone-based imaging sensor types (e.g., MicaSense multispectral, thermal, optical), each of which I have processed and generated a nadir orientation orthomosaic in a unique Agisoft project.

Because these images are of the side of mountains, I would like to also export oblique planar orthomosaics from a specific orientation / perspective. While I have done this before for individual layers, I have never done this for multiple sensors (again, in unique projects) such that I could regeoreference and overlay (or combine) the different sensor layers into a single multi-band raster. I have found that this process (the regeoreferencing) is nearly impossible to do unless one gets the exact same position and angle between different projects, which is very difficult to do. Especially when one is going off of the angle of the point cloud for thermal imagery (which is just a grayscale point cloud and very hard to determine such an exact position and orientation).

I want to know if there is some way to choose a precise look angle / location to export an oblique planar orthomosaic (and DEM), such that I could repeat or reuse the exact same position and angle between different projects.

Thank you for your time. Please let me know if you need any additional information or have any questions from me.

Thank you,
Capt. Cook

2

General / How to use Quick_layout.py?

« on: August 21, 2023, 06:34:25 PM »

Hi all,

I am relatively new to Python coding, but I am attempting to use 'quick_layout.py' to align photos I have over water that will not align otherwise. As such, I  am a bit unfamiliar with how to properly use this script. When I attempt to run the script [I downloaded the proper script version which should work with my current Agisoft version 1.8], I get repeated 'failures' in the processing window but I do not get any read outs of what errors the script encountered. I am therefore uncertain of what errors it is running into, and I am unsure if I have done proper pre-processing prior to attempting to run the script. Any help on how to perform this processing would be very much appreciated.

A bit more detail about the nature of my images: I have a mapping mission of Mavic Pro images, which have associated GPS and yaw/pitch information, over a river mouth extending out into a lake. Due to the relatively featureless nature of the water (as has been discussed in several other forum posts), I cannot get alignment of photos over deeper (and darker/featureless) water. As such I would really be interested in trying out 'quick_layout.py'. If someone could please help me perform this task I would very much appreciate it. I provided a couple screen grabs as attachments - one showing the failure in the processing window, another showing the extent of unaligned images along with the image information as shown in the Reference pane.

Thank you,
Chris Cook

3

General / Creating an Accurate 3D Model that is Easy to Measure

« on: May 18, 2020, 06:10:16 PM »

Hello!

I have been working on learning to use Agisoft over the past 6 months or so and I've found that it is relatively intuitive. I have, however, run into a bit of a wall when it comes to a current project.

I have a lot of drone imagery of a standard highway bridge. The imagery is taken by the drone from above the bridge (to capture the bridge deck surface), the sides of the bridge (to capture the fascia), and beneath the bridge (to capture the substructure and the road beneath the bridge).  This is a 100 meter long (or so) bridge, and because of the number of angles the imagery is captured from this is a large file (~800 or more photos). A medium quality dense cloud comes to 73 million points, and a medium quality 3D model comes to 1.7 million faces.

My issue is that it can be frustrating to use the measurement tool on this particular 3D model. Maneuvering the view such that I can see a specific part of the substructure of the bridge can be difficult or impossible because another part of the bridge might be blocking the view from most angles. For example, if I want to measure the width of a crossbeam under the bridge, I can maneuver the view perspective such that I'm sitting on the road under the bridge and looking upwards at the underside of the bridge, but if I try to zoom out at this point then the ground underneath the bridge will obstruct the view. It can be impossible to get the feature I want to measure to fit entirely within the view window.

What I would like to be able to do is have the bridge divided into separate chunks (e.g. chunk 1= bridge deck, chunk 2= bridge deck substructure) so that I can turn a chunk "off" so that chunk 1 does not obscure my view while I measure chunk 2. I would also like to be able to view both chunks at the same time (one on top of the other). I would also like to have these same chunks combined into a single model (preferably with similar positional accuracy) that I could use for visualization or to be shared with collaborators in Agisoft Viewer. Is there any workflow that might help me do the above?

Alternatively, is there any way to click a start measurement point, move the view, and then click the ending measurement point? It seems like I am unable to move the view while in the process of measuring a feature.

Thank you so much!
-captcook42

EDIT: When I refer to "making a measurement", I'm referring to using the "Ruler" tool. Thanks!