In the close range photogrammetry

the quality of the generated digital surface model is controlled by some course parameters . This paper discuss these parameters from technique method

band choice and fusion

image correlation parameter

analysis their influence to the quality of output DEM

and present the experienced way of the choice of these parameters. Using two different technique: Block or Stereo

the number of correlation points is near

but the quality of the result is different

the result of Stereo is better. There are many bands can be used

but only one is needed in the image correlation. To the different color band

Red and Green seem to have good result

the Red band is better. The fusion band

such as intensity band or the first principle band

can increase the correlation points. At the image correlation course

the correlation template size is sensible to In some range

increasing the template size can increase the number of correlation point. The larger template range

the larger number of correlation points. But at the same time

the error area appears seriously. To resolve this problem

using rejection factor

maximum parallax and skip factor can get a better result image.