Image Map Calibration
Answered
The user manual states that four calibration points are required to align the image map. Question:
Does the number of calibration points affect the accuracy of image map alignment?
If so, what is the optimal number of calibration points?
And another question:
Why aren't the calibration points themselves located at the specified locations on the calibrated image map? Somewhere close, but not exactly where indicated.
The same question
Hi,
4 points are the minimum; the more points, the better the result.
"Why aren't the calibration points themselves located at the specified locations on the calibrated image map? Somewhere close, but not exactly where indicated."
- do you have a screenshot?
Hi,
4 points are the minimum; the more points, the better the result.
"Why aren't the calibration points themselves located at the specified locations on the calibrated image map? Somewhere close, but not exactly where indicated."
- do you have a screenshot?
1. Three control points are sufficient for georeferencing an image. When using only three control points, all three points are located exactly where they were set. However, map areas located far from the control points have significant errors.
2. Adding a fourth point increases the average georeferencing accuracy, but all control points are no longer located where they were set.
3. Adding more than four control points doesn't improve alignment accuracy. I've added up to 12 points. There's no significant difference between four and 12 points.
Here is an example of a map and binding configuration:
https://drive.google.com/file/d/1pn9zS5RmychADyrAW0N93GvBLoqEz8uh/view?usp=drivesdk
1. Three control points are sufficient for georeferencing an image. When using only three control points, all three points are located exactly where they were set. However, map areas located far from the control points have significant errors.
2. Adding a fourth point increases the average georeferencing accuracy, but all control points are no longer located where they were set.
3. Adding more than four control points doesn't improve alignment accuracy. I've added up to 12 points. There's no significant difference between four and 12 points.
Here is an example of a map and binding configuration:
https://drive.google.com/file/d/1pn9zS5RmychADyrAW0N93GvBLoqEz8uh/view?usp=drivesdk
Hi,
thanks for all the photos but unfortunately, we are unable to reproduce any significant problem with the calibration. Actually, Locus Map is not a professional tool, if that is the matter, there always will be some slight deviations.
Hi,
thanks for all the photos but unfortunately, we are unable to reproduce any significant problem with the calibration. Actually, Locus Map is not a professional tool, if that is the matter, there always will be some slight deviations.
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