ps1585

P1 = 7.2 cm     P2 = 50.0 cm

P1 is best estimate of Z measurement error, P2 is best estimate of XY measurement error
details   n = 8396

Contours on graphs enclose 99%, 95%, 90%, 75%, 50%, 25%, and 10% of data. 95 and 50 percentile contours are red.
Heavy black lines are RMS y for each value of x.

Correlation of relative Z error with local slope

Click on images for close-ups

Correlation of relative Z error with local curvature

Correlation of local slope and local curvature


Curvature values are those reported by
ArcInfo CURVATURE command. From the
ArcInfo documentation:

CURVATURE is the second derivative of the
surface (i.e., the slope of the slope), calculated as

Curvature = -2(D + E) * 100

Coefficients D and E are estimated by fitting the function
Z = Ax2y2 + Bx2y + Cxy2 + Dx2 + Ey2 + Fxy + Gx + Hy + I
to the values in a 3x3 window