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21
General / Re: workflow for urban areas
« Last post by Alvaro L on May 17, 2019, 10:05:20 PM »
Urban areas are the most difficult case for a photogrammetry work. Usually a combination of oblique, zenital and detail pics should work but a good mission planning workflow is very important so you can optimise flights, pics and processing for a good result. I can't go into details but in short your usual planning software and clueless rectangular grid patterns won't work. Your flight pattern and camera angles should adap to urban grid, street width and building heights. I am also against doing it in a on single field data, you need to iterate in your planning approach, model photographing and software reconstruction loop. You need command of several software packages to do it right.

https://sketchfab.com/3d-models/montblanc-4998e976b9894acdaa93ade53075664f

Some universities have published papers about city sampling and reconstruction works, but they use some serious overload of tools and resources we don't have, like combination of laser scanning on car with airplane based areal photogrammetry with rigs that get to shoot several cameras at once plus GCP with total stations, university support and staffing, etc. Even so, I think it can be done exclusively on photogrammetry work if you get to understand what it is going on, for instance how to get pics from ground level and from drone level correctly aligned.
22
Feature Requests / Apply finished iterations if refinement cancelled halfway
« Last post by Alvaro L on May 17, 2019, 09:56:54 PM »
Title says it all, apply finished iterations if a mesh refinement is cancelled halfway, at least as an option, if that is ever possible for the algorithm. Thanks !
23
Python Scripting / Re: Can not export depth maps
« Last post by Alexey Pasumansky on May 17, 2019, 09:21:13 PM »
Hello Tinco,

I can send you pre-release of the version 1.5.3, when it would be stable enough, where the issue is fixed.
24
Python Scripting / Re: Can not export depth maps
« Last post by tinco on May 17, 2019, 07:59:30 PM »
Ah thanks Alexey, that explains a lot. So at the moment we're calculating the depth maps twice, and it's not even using the high quality depth maps for constructing the final model.

Is there a way we can get a tiled model based on high quality depth maps? It is important for our use case that they be as accurate as possible. Would it be better for example to make the dense point cloud based on the depth maps and then make the tiled model based on that?
25
Python Scripting / Re: Can not export depth maps
« Last post by Alexey Pasumansky on May 17, 2019, 07:17:22 PM »
Hello Tinco,

Looks like in 1.5.2 (7838) the buildTiledModel task is not actually re-using the available depth and is rebuilding the depth maps set with the default quality.

But if you are running the tiled model reconstruction via Tasks class, the depth is kept:
Code: [Select]
task = Metashape.Tasks.BuildTiledModel()
task.source=  Metashape.DataSource.DepthMapsData
tasks.store_depth = True
tasks.apply(chunk)
While running via "chunk.buildTiledModel()" would discard the depth maps after reconstruction.
26
Python Scripting / Re: Can not export depth maps
« Last post by tinco on May 17, 2019, 06:41:11 PM »
Does it throw away the depth maps after buildTiledModel?
28
Python Scripting / Arcpy inside Photoscan?
« Last post by GFEP on May 17, 2019, 05:49:05 PM »
Is ther a way to call the arcpy library inside Photoscan?
29
Hello Alexey,

thanks for answering that fast!

I'm surprised that you remember our discussion under all those others and answering those lot of questions (I have seen you have written over 10.000 answers now, wow congrats!

I will definitely have a look in the Multicamera System, we have the Pro version at our office now. So when I'm back at our office next week, I'll give it a try. The overlap between both fisheyes is very small, only 20 degrees of a sphere (both fisheyes have 190 degrees).

Thank you for the offer to send you an image set, I think I will need it.

Best regards

Kiesel
30
Python Scripting / Re: Can not export depth maps
« Last post by Alexey Pasumansky on May 17, 2019, 03:55:29 PM »
Hello Tinco,

Maybe I was wrong and those changes have been implemented to API already after 1.5.2 release.
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