To the technique of RTK in long engineering usage of the error margin that point correct carried on the analysis and studies,and put forward to let up the error margin to solve the method.

If the linear range of detecting devices was narrow, it was necessory to make multipoint correction, namely, application of dif-ferent correcting factors for the samples to make corresponding analysis.

In this paper, a new, real-time and uniform two-point correction method for the infrared imaging system is carried ou.

Then introduces main contrast examination and principles on three GPS RTK correct means: single point correction, multi- points correction parameter correction and searches precision of three correction means by the exami.

Due to the fact that local coordinate system is usually used in practice and coordinate and elevation in WGS-84 which are directly obtained when GPS technology is used to determine position of earth’s surface point, coordinate transformation or point correct is necessary in GPS-RTK surveying.

To the brightness and color ununiformity of LED display,this paper introduced the technology of the spot-spot correction of the LED display,especially the solution based on industrial camera.