ge 
by 
his 
y. 
ps 
on 
to 
E d 
Oo ga 
reference map. For the generation of digital map, we used 
SOCET-SET 5.2 and HIST-DPW. The digital map scaled by 
1:5000 is generated by professional operator, who had over ten 
year experience in plotting. 
     
Figure 4. The reference digital map generated by ae 
over study area. 
    
5 
rial photo 
4. RESULT AND DISCUSSIONS 
In this study, we carried out image quality estimation by edge 
analysis method based on natural target. The result of image 
quality estimation presents that quality of QuickBird image is 
the best among other images. The difference of GSD between 
QuickBird, IKONOS and KOMPSAT-2 were not much but 
difference of other parameters such as RER, GRD, NIIRS were 
$0. QuickBird and IKONOS produced similar values of RER, 
GRD and NIIRS. On the other hands, the quality of 
KOMPSAT-2 images was lower in this experiment. Table 4 
shows the result of image quality estimation and the number of 
points used for edge analysis. 
After estimating the image quality, we generated the digital maps 
scaled by 1:5000. The result of the plotted features is presented 
in Table 5. In the table, we can identify that digital maps 
generated from QuickBird and IKONOS present 33layers of 34 
layers. The digital map, generated from KOMPSAT-2 satellite 
images, presents 11 layers of 34 layers. These results imply that 
identifiable features cannot be expected with GSD only. For all 
three image types, GSDs were in a similar range. We could also 
observe that SNR can neither explain the digital map quality. 
SNR values for all three types were similar. 
The image interpretability affected to recognize the features 
within image. The differences of RER, GRD and NIIRS were 
significant between QuickBird/ IKONOS and KOMPSAT-2 
images. 
Table 5. The result of digital map generation(I: Identified, -: 
Cannot identified) 
Quick | IKO 
Bid I nos | 72 
1-2 
Layer 
Rai 
Railway Bri - 
Bridge 
River 
Stream 
stream 
Lake/reservoir 
Concrete Bank 
Road 
City Road 
Road in site 
All 
Median Stri 
Pedestrian Overpass 
Sidewalk 
Concrete Bridge 
Ov 
Building other than 
housin 
poet | pt | pt | pt | pt À pet À pt | pt À pret | pt | opt | op | mat | mat | mat | mat | mm 
pt | pe | pt | pt | pt | pt | pt | pt | pt | pt | pe |p | pt | pt | pt | pt | pet 
— 
— 
House 
Townhouse 
t 
Concrete Wall 
Hedge 
Fence 
Branch 
Farmland 
Type Other farmland 
of Rice Padd 
ground Field 
Orchard 
Cemet 
Facili Other Concrete 
ties Structure 
Geogra Intermediate Contour 
phic Index Contour 
Total 
  
Table 4. The result of image quality estimation. 
  
  
  
  
  
  
  
  
  
  
  
  
Sensor SP RER SNR GRD NHIRS30 | nurs4o | Vert of 
(across / along) edge 
vu Left 0.793 / 0.711 0.4920 24.66 1.2705 4.33 4.02 230 
QuickBird - 
Right 0.829 / 0.708 0.4783 23.62 1.3661 4.29 3.97 233 
ONDE Left 0.900 / 0.960 0.4723 22.38 1.5667 3.98 3.69 200 
Right 0.920 / 0.900 0.4448 23.54 1.6673 3.94 3.65 202 
Y 7") » 
 KOMPSAT = Left 1.295 / 1.095 0.3315 19.75 3.3139 3.20 2.96 293 
Right 1.042 / 1.013 0.3626 18.06 2.6278 3.51 3.27 317 
  
  
  
  
  
  
123