This paper discusses several problems in non-contacted three-dimensional scanning measurement data processing,such as noise points deleting,distortion point searching,data simplification and smooth processing,point cloud data registration and integration.

Fractal research on reflection coefficient series was done on the basis of fractaltheory- The research leads to the conclusion =the power spectrum of reflection coeffi-cient series is not white noise land it is directly proportional to the power of frequen-cy in most cases,that is to say,the reflection coefficient series has fractal property.

The white noise interference in GIS PD is analyzed.

As we assumed the power spectrum of the reflection coefficient is white noise in traditional method to calculation autocorrelation wavelet, so there is some limitation in practice.

This paper discusses in detail how to obtain the inverse wavelet by using least squares, why the effect of conventional inverse filtering is not so positive, and also analyses the inverse filtering effect after noise whitening from error energy, frequency characteristics, the information difference between whitened and nonwhitened noises, and other aspects.