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Messages - Paulo

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1
General / Re: Oblique Flight Tie Point Problem
« on: Today at 05:34:49 PM »
Hi mescioglu,

I think your 2nd (B NE-NW) EO angle values are wrong compared to A flight EW. As you can see in attachment, I placed 10 images. Five with A sample EO and 5 with B sample EO. Sample A are correct as seen in 90 degrees angles in projection lines from cc to principal point (black lines) while B lines are not 90...

The second image from sample b should have angles around (-45, 0,- 151) and not (-20.33209, 41.06355, -159.08256)

2
General / Re: upside down cameras using archived aerial photographs
« on: March 24, 2024, 09:42:25 PM »
Hello evangeline,

I think there is a problem with polar stereographic projection (3031). In Global mapper I placed 2 points in Polar stereo at following  geographic coordinates:
Code: [Select]
Point 0 (90.0 S, 0.0° E)
Point 1 (80.0 S, 0.0° E) 

But when I place same 2 points as markers in Metashape, I get very different projected Y value as seen for point 1 where in GM it is around 1 089 179  and in MS it is only about 30 890..

Something wrong with projection....

3
General / Re: Batch exporting all products in a chunk - Various Topics
« on: March 22, 2024, 06:09:39 PM »
Hi pereira,

if I understand you have 2 dems to export for every shape. SO if you a loop over all dems in chunk then it could export 2 dems for each shape..

named something like DEM1_shapelabel.tif and DEM2_shapelabel.tif...

look at attachment if this can be ok...

4
General / Re: Batch exporting all products in a chunk - Various Topics
« on: March 22, 2024, 03:46:26 PM »
Hello p_pereira,

for your second problem. To avoid having a gap at right and bottom, of each exported product, you must assure that the grid size (length and width) is an exact multiple of your resolution. Fo a square grid of 1km by 1km and resolution of 25 cm by 25 cm then there should be no gap  as:
Code: [Select]
1 km = 1000 m divided by 25 cm is exactly 4000but if grid is 1000.1 m by 1000.1 m then there will be a gap of 10 cm at right and bottom...

For first problem. script could be modified looping thru all dems in chunk....


5
HI maurello,

since version 2.0, tie point are represented by chunk.tie_points and not chunk.point_cloud. sO if you change this in script, it should work....

Hope this helps get you along

6
General / Re: Incorrect Show image with calibration with k4
« on: March 21, 2024, 07:00:13 PM »
Definitely strange ...

Only thing I can think of is uninstall and reinstall latest version....

7
General / Re: Point Cloud Delete Points by Confidence
« on: March 21, 2024, 06:54:54 PM »
Hello Clayton,

to avoid this iterative selection process, check that Visible Selection is unticked in the selection drop down button...

If it is ticked then selection would only select points that are visible from model point of view...

Hope this solves it

8
General / Re: Incorrect Show image with calibration with k4
« on: March 19, 2024, 02:22:26 AM »
Hey Dave,

a while back,  processed some EVO2 data you shared with and distorsion plot is OK..se attachment...

So beats me why your blots are blank...

9
General / Re: Incorrect Show image with calibration with k4
« on: March 16, 2024, 01:55:06 AM »
Definitely have a problem with your distorsion plots...

10
Hi max,

for altitude. I think the following script would do the trick for you https://github.com/agisoft-llc/metashape-scripts/blob/master/src/add_altitude_to_reference.py

11
Camera Calibration / Re: DJI M3E RTK - Camera calibration and dewarp
« on: March 15, 2024, 09:41:20 PM »
Hello jerm,

maybe have a look at https://agisoft.freshdesk.com/support/solutions/articles/31000161735-dji-with-rtk-coordinates-data-processing. Should give you a good starting point for processing DJI M3E RTK...

12
General / Re: Incorrect Show image with calibration with k4
« on: March 15, 2024, 09:10:14 PM »
That is more like it... However blank radial plot would imply that either your adjusted radial parameters are 0 or Initially fixed at 0.... Strange....Maybe you can show the correlation tab?

13
General / Re: Incorrect Show image with calibration with k4
« on: March 15, 2024, 06:48:23 AM »
Dave,

strange you should get plots available for ll options even if plot is white .... Something is wrong...

Yes I fly with dewarp off as I want MS to estimate its own calibration parameters...


14
General / Re: Incorrect Show image with calibration with k4
« on: March 14, 2024, 06:21:17 PM »
Hello Dave ,

yes the k4 less calibration is certainly adequate. But given the significant radial distorsion in this wide angle lens, I decided to compare  a 5 cm GSD calibration flight, optimizing with and without k4 checked. And I got slightly better results in terms of reprojection error (error promedio de reproyeccion) and tie points variance (Precision promedia de puntos) but a little worse in GCPs error using k4  compared to nok4... Following results with k4 first then without...

Code: [Select]
---------------------------------------------------------------------------
    Reporte Puntos de amarre - Calib_110_140_pr_Optk4_gradsel_RU_PA_RE - Calib_5cm.psx version 2.0.2.16334
 ---------------------------------------------------------------------------
 Sigma0: 0.998
 Precision de puntos de amarre (pix): 0.13
 Numero de puntos de amarre: 93610
 Numero de proyecciones: 315302
 Promedio de proyecciones (TiePts) por foto: 1480
 Numero de fotos alineadas: 213
 Numero de puntos iniciales: 456675
 Numero de proyecciones iniciales: 2210367
 Error promedio de reproyeccion (pix): 0.276
 Error maxima de reproyeccion (pix): 1.529
 Error medio cuadratico (RMS) de reproyeccion (pix): 0.330
 Precision promedia de puntos (cm):3.988 sX, 3.499 sY, 6.579 sZ, 8.452 sTotal
 Tamano promedio de punto (pix): 2.352
 Multiplicidad promedia de punto de amarre: 3.368
 Multiplicidad promedia de punto de amarre (todos): 4.840
 ---------------------------------------------------------------------------
 Script finished in 2 seconds.

Total error GCPs:
    Control points 0.015 0.019 0.019
    Check point 0.025   0.029 0.048
   
---------------------------------------------------------------------------
    Reporte Puntos de amarre - Calib_110_140_pr_Nok4_gradsel_RU_PA_RE - Calib_5cm.psx version 2.0.2.16334
 ---------------------------------------------------------------------------
 Sigma0: 1.008
 Precision de puntos de amarre (pix): 0.18
 Numero de puntos de amarre: 93610
 Numero de proyecciones: 315302
 Promedio de proyecciones (TiePts) por foto: 1480
 Numero de fotos alineadas: 213
 Numero de puntos iniciales: 456675
 Numero de proyecciones iniciales: 2210367
 Error promedio de reproyeccion (pix): 0.384
 Error maxima de reproyeccion (pix): 3.199
 Error medio cuadratico (RMS) de reproyeccion (pix): 0.465
 Precision promedia de puntos (cm): 6.094 sX, 5.460 sY, 9.940 sZ, 12.875 sTotal
 Tamano promedio de punto (pix): 2.352
 Multiplicidad promedia de punto de amarre: 3.368
 Multiplicidad promedia de punto de amarre (todos): 4.840
 ---------------------------------------------------------------------------
 Script finished in 2 seconds.

Total Error GCPs:
    Control points 0.016 0.018 0.017
    Check point 0.005 0.025 0.002

All in all there is no significant difference.... I think

Attached is camera calibration comparison (no k4 - k4). Clearly image residuals are smaller  with k4....

15
General / Re: Incorrect Show image with calibration with k4
« on: March 13, 2024, 06:05:44 PM »
Thanks Alexey,

this what i found when I tried using reverse projection and iterative approximation. At top right corner the iterative approximation does not converge rather diverges towards infinity...

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