nbul 2004 
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B2. Istanbul 2004 
  
If the number of data points used are fairly equal at 
each grid node, then the quality of the grid at each 
grid node can be interpreted. 
b) The standard deviation, variance, coefficient of 
variation, and median absolute deviation of the data 
at each grid node. 
These are measures of the variability in space of the 
grid, which is important information for statistical 
analysis. 
c) The distance to the nearest data point. 
For example, if the XY values of a data set are 
sampling locations, the Distance to the nearest data 
metric can be used to determine new sampling 
locations. A contour map of the distance to the 
nearest data point can quantify where higher 
sampling density may be desired. 
2.12 The Local Polynomial Method 
The Local Polynomial method assigns values to grid 
nodes by using a weighted least squares fit, with data 
within the grid node's search ellipse. 
  
Experiment the DTM collect 
  
  
  
y 
Establish the 
  
  
3. EXPERIMENT DESIGN 
The purpose of this experiment was primarily to take 
a spatial interpolation method, with the assistance of 
SURFER software, to move the spatial interpolation 
of DTM from 40 m to 5 m, and to report 
comparisons and results. The actual operation made 
use of the Chen-Yu-Lan river region the ground 5 m 
D'TM of the results, and not pass by the mathematics 
to calculate but the direct to take the 40 m DTM , 
again then this 40 meter manuscript input the 
interpolation of SURFER software put to compute 5 
m DTM , and 5 meter manuscript ratio then right 
acquire its interpolation to put the analysis of error 
margin of the calculation. The flow charts and sketch 
maps of the experimental district were designed as 
follows: 
  
interval of 5 meter 
DTM 
  
  
  
v 
  
  
Do'nt calculate through the 
meter DTM 
  
mathematics and direct to take 40 
  
  
  
v 
  
Make use of the SURFER software 
5 meter 
  
  
With the DTM of 5 meter 
DTM compares the 
interpolation put 
calculation it DTM 
margin for error analyses 
v 
  
  
  
  
  
  
interpolated the DTM from 40 meter to 
  
  
Figure 1:Flowchart of experimental design