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« Last post by Helimax on October 30, 2025, 02:20:52 PM »
Hello,
It would be really great to be able to apply a cropping ratio to orthophotos.
For correlation, the overlaps must be significant, but for mosaicking this presents disadvantages
Indeed, when using a smart stitching algorithm like the "refine seamlines" function, the lines are sometimes very winding, and the software may search for areas at the edges of images.
In the attached example, you can see that image AK31 is chosen for the area directly above image AK30. For standard orthophoto (not true ortho) this increases the tilt on the buildings. But this is an important factor for our customers.
The ability to crop orthophotos solves these problems in addition to reducing file sizes.
For example, we often use overlap ratios of 70/55% during shooting, but for mosaicking, we prefer ratios of 38/34%. Therefore, we need to crop the images by 52% longitudinally and 32% laterally.
Or else :
High : 26%
Down : 26%
Left : 16%
Right : 16%
(In some cases the cropping High/Down or Left/Right may be different.)
This function could be used either during the orthomosaic build workflow or when exporting orthophotos for mosaicking with third-party software.
Best regards
Maxime