Data processing error: geometric rectification, data conversion.
Errors in rectification and GPS coordinates cause observations of ground attributes to be associated with spectral values of incorrect pixels which, in turn, introduces classification errors into the resulting maps.
Error of the rectification varied between 9 m and 29 m, but the positional error of the sample points is larger because of limited means to determine accurate geographic coordinates in the 1970s.
Another error that required rectification was the opposite orientation of the CEN6/ ARSH4 cassette in pRS313 and pRS413 compared to all other pRS CEN plasmids.
For the error of ortho-rectification algorithm, currently, the main models used for ortho-rectification involve affine transformation-based strict geometric models, collinear equation model, rational function model and polynomial model.
This led to the generation of error in ortho-rectification due to change of landform.
The DEM's low accuracy unavoidably adds to the error in ortho-rectification.
Likewise, according to the geometric principle of ortho-rectification, and calculated at an image shooting angle of 17.7º and the maximum vertical accuracy of 20 m, it can be deduced that the maximum ortho-rectification error is up to 6.38 m.
For example, in the operation of ortho-rectification, the error from high-resolution image not in step with DEM in time and the error from error of DEM may counteract with each other. .
I especially remember the 1986 congress that led to the "rectification of errors and negative tendencies," putting an end to the free farmers' markets and leaving on our tables a monotonous menu of rice with canned meat from the USSR.
