P2-1-3 
able to carry out successively geometric correction on field with 
Affine transformation using TIN-model, it is able to heighten 
positional precision. 
3.2 Successively Geometric Correction on Field 
We compared corrected image with DM data to verify positional 
difference of geometric correction using Affine transformation 
and using TIN-model. 
To exclude influence by observation error of GPS, we used DM 
data as coordinates of control points 
Figure 5((a),(b)) shows first step geometrically corrected image 
(Using six control six points). 
Figure 5(a) First Step Geometrically Corrected Image 
(Affine Transformation) 
Figure 5(b) First Step Geometrically Corrected Image 
(Affine Transformation Using TIN-Model) 
Figure 6((a),(b)) shows second step geometrically corrected 
image (Using nine control nine points). 
Figure 6(a) Second Step Geometrically Corrected Image 
(Affine Transformation) 
Figure 6(b) Second Step Geometrically Corrected Image 
(Affine Transformation Using TIN-Model)