Input mark format tiepoints file created by program TRACKER. Contains 4 word groups leftline,leftsample,rightline,rightsample. real format 512 byte records. Bad points are zeroed out.
Identical to INP except deleted tiepoints are zeroed out.
Number of tiepoints in the near vicinity of each tiepoint to use in a least squares fit to predict that tiepoint from it's neighbors. Must be between 4 and 20.
Weighting distance used in weighting points according to their distance. Weight=DISTANCE/(d+1) where d is the distance to each tiepoint in pixels.
The maximum vector length permitted. Any vector longer than this is rejected.
Maximum permitted angle deviation between the tiepoint vector and
the vector predicted from the neighboring tiepoint vectors.
In degrees.
If Ar is the vector angle and Ap is the predicted
angle then the tiepoint is deleted if:
abs(Ar-Ap)*Lr/(Lr+BIAS) > ANGLE
See the BIAS keyword.
Maximum permitted length deviation between the tiepoint vector and
the vector predicted from the neighboring tiepoint vectors.
This is a ratio between 0 and 1.
If Lr is the vector length and Lp is the predicted
length then the tiepoint is deleted if:
abs(Lr-Lp)/(Lr+Lp+BIAS) > RANGE
See the BIAS keyword.
BIAS protects short vectors from being deleted. It should be set to about the length of the shortest vectors which one considers to begin to be immune from testing. For purposes of geoms or morphing a vector of nearly zero length does no harm. Such a short vector really points nowhere and it's angle is meaningless. You generally want to keep it.
Both range and angle checks must be violated for a point to be deleted. The default is to delete the tiepoint if either check fails.