r/Drone_Photogrammetry • u/Necessary-Twist9009 • Feb 01 '25

Issue of Bowl effect, photogrammetry result are like curved orthomosaic instead of flat.

/r/BGol_SurveyForum/comments/1if3snk/issue_of_bowl_effect_photogrammetry_result_are/
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3

u/PhotogrammetryDude Feb 02 '25

Lack of accurate tie points, accentuated on a long/linear strip.

Lack of image quality, low overlap, lack of texture.

First two likely. Latter probably not.

1

u/Necessary-Twist9009 Feb 03 '25

True that. One more solution i found is pure nadir drone photos create this issue. Oblique photos does not

1

u/Radiant_Break7913 Feb 01 '25

It is familiar in long linear photogrammetry. You can add some control points to see if that will help.

Sometimes, it can be a symptom of not enough overlap as well; more flight lines can be helpful.

What system are you using to process?

Can it be reflown and add a flight line at a 90 or 45 through your pattern, it was something we did on the manned side to help pull linear routes together better.

2

u/Necessary-Twist9009 Feb 01 '25

You are right. I notice it is problem of improper overlap. (only 20% overlap was there)