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Messages - JMR

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31
General / Re: image stabilisation - yes or no
« on: June 11, 2021, 03:15:46 AM »
I'm open to learn, but to my understanding, IS means lots of changing conditions in calibration parameters between shots. This is mainly in terms of principal point, but also, with modern 5 axis IBIS, I guess also more parameters are involved. Do you, Wojtek, mean this is nothing one should be worried about at all
Or... is there something to be added to your "why not IS?" like "however, you would need to un-group cameras in calibration". Thanks

32
General / Re: Should I build dence point cloud at all now?
« on: June 05, 2021, 02:19:38 AM »
For me the main reason to use dense cloud rather than depth maps is the ability to apply classification and also because it is easier to remove unwanted parts from a dense cloud than editing a mesh. Better mesh editing tools and improved selection tools would be greatly welcome.

Geobit

33
Bug Reports / cylindrical dem
« on: May 25, 2021, 04:01:53 AM »
Hello Alexey: Have your fixed known issues with cylindrical dem>ortho?

Best regards,
José

34
General / Re: Measure 3D height from 2D image
« on: May 10, 2021, 12:55:52 AM »
Hello, Paul.
Drawing a point on one single photo (2D) is a risky idea. If one wants to use monoscopic approach it is necessary to use markers attached to the shape (point in your case). By means of this special type of markers, the user can pin the same vertex on different images and it leads to a perfectly well determined elevation.
Using stereo input is very well suited for the task but honestly I would not recommend anyone to use anaglyph method for longer than 5 mins. If one wants to use stereo, having a professional stereo display like Pluraview is a must.
I would suggest to the OP to draw a few points on one photo where he/she sees the tip of the trees, then select all points and attach markers by context menu (this can also be automated in tools/markers/attach markers). Then jump to next image and move markers to same corresponding points on trees, a third photo will give chance for check or further refinement.
This type of markers cannot be hidden or removed in 1.7.2 but will be removable in next version coming soon.
By using foint shapes for the measurement one gains interesting advantages over using regular markers:
  • Shapes can hold attriutes (like tree species, log diameter, etc)
  • Shapes can be organised in layers
  • Shapes can be exported as text or CAD files
  • Points with markers attached wont play any role on alignment and wont be in conflict with actual markers used for reference


Regards
José Martínez
Geobit & Accupixel
Metashape training

35
Feature Requests / quantities to attributes
« on: May 04, 2021, 08:15:17 PM »
It would be a good idea an option to write the result of volume measurements to the attributes of the shapes used for their estimation.
Along with quantities the list of attributes should include method and parameters used for fill/cut calculation and perhaps timestamp so quantities can be linked to a given DEM status or creation date?

Best regards.

GEOBIT

36
General / Re: Difference between Add Marker and New Marker
« on: April 30, 2021, 02:25:06 PM »
add marker tries to find something intersecting the projection ray that passes through the pixel and something else (mesh, dem, dense cloud) if that occurs, the marker will be created on the 3D space with source coordinates filled taken from the aforementioned source item.
place marker new, just creates one marker projection in the current photo (2D) source coordinates remain empty. The marker will become apparent in the 3D space once that you (or the program on its own means) place another projection of same marker on a different photo. but still the marker remains with empty source coordinates.
to align unreferenced chunk to a referenced one by markers shared between the two, you don't need source coordinates, so you can use whatever type of marker. what you should not allow it it to have "source" marker coordinates on the non-referenced chunk while having the marker checked in ref pane list (otherwise they would be in conflict with destination coordinates)

Regards,
Geobit
Accupixel
Agisoft endorsed training

37
General / Re: Use of markers and marker corrections
« on: April 11, 2021, 10:00:31 PM »
Manual target placement accuracy depends on human factors and also on image quality, while automatic (computer) placements is supposed to be very reliable and less prone to bias.
If you find blue auto-markers misplaced in some photos there must exist a reason and they need to be corrected.
You have two options: to remove projection or to move manually to a better location. If your preferred option is to move, I also recommend you to remove first and place later. This way you'll see the expected location of a marker (gray flame) and perhaps it gives you some keys to understand the bias.
Removal or movement of a few marker projections to different image coordinates makes little difference in the alignment if you only update transform. Affected cameras wont vary their relative orientation but only global scale and rotation may change very slightly so the answer is you must OPTIMIZE to make your corrections meaningful.
Check individual pixel error per marker projection by using marker info tool, and check which projections are worse placed.

Regards
Geobit & Accupixel
Agisoft endorsed training.

38
General / Re: Profiles
« on: April 08, 2021, 01:11:26 PM »
by sectioning model I guess you mean the mesh, dont you? I normally use Polyworks but cloud compare can work for that as well.
https://www.cloudcompare.org/doc/wiki/index.php?title=Cross_Section

Regards
Geobit and Accupixel
Metashape training.

39
General / Re: reset selected cameras removes tie points
« on: April 08, 2021, 01:06:16 PM »
Tie points are matched feature points. If you reset some cameras alignment, the tie points will be removed form the 3D scene as the cameras are no longer located in the 3D scene. However key points are still on your photos so you can use align selected cameras to bring them back to the 3D scene hopefully in a better location. It should take but just seconds to re-align cameras that where reset.

Geobit and Accupixel, Metashape training

40
Hi, you need to learn how to use "region". Try to reset region found under Model/transform region or in the region button dropdown.
Kind regards.

If you need some training, I suggest you to take our Agisoft endorsed course. https://accupixel.co.uk/metashape-training-courses/

Geobit & Accupixel

41
Feature Requests / Re: Shapes on pictures
« on: March 05, 2021, 04:16:36 PM »
This (drawing on photos) is something that can be done since long time ago. I don't understand what you mean. Can you clarify your question.

Regards
Geobit & Accupixel

42
General / Re: To Create and to export a Section from Ortho
« on: March 04, 2021, 11:36:54 PM »
Exporting profile as 3d dxf is supposed to produce exactly what you got. a 3d polyline. If you want rather to export the profile plot with axis, labels, etc. I'm affraid you need to export the profile as an image and paste it wherever you need it in your drawing, but it will not be a vector graphic.
Regards.
Geobit & Accupixel



43
General / Re: How does Assign Images works ?
« on: February 23, 2021, 09:53:02 PM »
Quote
but the best fit image will be assigned automatically
There is something that should be clarified. This automation takes for reference the location of first vertex you enter when you draw the patch.
I think developers should rather offer a few best choices according to:
1. Camera closer to the centre of mass of the patch (no to the first vertex), and closest to the principal point of suitable cameras.
2. Best orientation. best fit plane on patch vertices could be used to sort photos according to angle with respect to the patch.
3. Content awareness. In a more advanced approach, the software should be able to skip photos with pixels that are inconsistent between overlapping photos. That would help to remove moving vehicles, for example. Actually I wonder IF Such smart filter could not be used during orthomosaic creation as well to automatically remove people, cars, birds, branches, etc.

Regards
José Martínez
GEOBIT / ACCUPIXEL

44
General / Re: New 1.7 Cylindrical DEM/Ortho Issues
« on: January 18, 2021, 04:17:25 PM »
Hello JRMertes,

For cylindrical orthomosaic generation you should also select the mesh source, as it currently doesn't work for DEM source option in this mode.


Hello, Alexey
I have reported this option not working more than a year ago. You also answered "currently..." and that made me think it was a temporary issue... I have seen quite a number of updates and fixes since, but this inability remains unsolved. Why? I remember it worked well once, so I wonder what it takes so long this fix to come. IN the meantime the option should be disabled to warn user to not waste time.
Best regards.

45
General / Re: Agisoft Metashape 1.7.0 pre-release
« on: January 01, 2021, 09:25:56 PM »
Happy new Metashape version!
Exclude stationary points... sounds like a great help for rotary table scans, doesn't it?

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