original scan was 20,654 data points , effective
probe radius = 0.937 mm ( 0.037 " ).
Typical 0.25 mm ( 0.010" ) point to
point, 1.00 mm ( 0.039" ) line
to line interval.
original raw data had 274 to 300 data points per scan
line with the datum at center of ball.
first step is to grid the input so that all lines have
the same number of points ..... 301 per line.
next step is to calculate the local slope at each point
and find the actual contact point on
surface. This surface data set was then sparsed.....thinned
out to 19 rows of 31 points each.
file contains a few rows of data points which show some
of the key advantages of touch
digitizing . . . the raw data set is extremely accurate,
ordered and without noise.