NVI I 
{2 
| Computation of NVI 
mage 
     
     
Topographical Map 
A 
[XD x 44 
PETITS 
Satellite Image 
"A. 
   
  
  
  
“em 
Water Area 
  
1 1 
"Land Area" in 
Old Land Use Data 
  
  
   
  
  
  
  
Candidate for 
Land Use Changed 
Area 
Enclose of 
Land Use Changed 
Area with Mouse 
( NVI:Normarized Vegetation Index) 
Water/Land Discrimination 
Non- 
N 
in 
  
! 
l 
I 
| 
t 
"Vegetation 
Y 
Land Area 
  
i 
Vegetation Area 
Vegetation/Non- Vegetation 
Discrimination 
| 
Vegetation Area 
  
1 1 
"Non-Vegetation Area" 
in Old Land Use Data 
i 
Area" 
01d Land Use Data 
  
Extraction of 
Land Use Changed Area 
EB» 
i 
Update of Land Use Data 
Fig.5 Concept of the land use data 
updating procedure 
3.2.2 Vegetation to Non-Vegetation Renewal 
(1)The NVI non-vegetation areas which 
items were vegetation in the old land use 
data are extracted. These areas will be 
the candidate for land use change. 
Fig6.(b) to (d) shows a example of this 
procedure. 
(2)The candidate areas are colored in 
yellow and overlaid on the SPOT/TM false 
color image. 
(3)The land use changed areas are selected 
by image interpretation and are enclosed 
with mouse. 
(4)The new non-vegetation items are as- 
signed to the enclosed areas. 
125 
3.2.3 Vegetation to Water Renewal 
(1)The NVI water areas which items were 
vegetation in the old land use data are 
extracted. These areas will be the candi- 
date for land use change. 
(2)The candidate areas are colored in 
yellow and overlaid on the SPOT/TM false 
color image. 
(3)The land use changed areas are selected 
by image interpretation and are enclosed 
with mouse. 
(4)The new water items are assigned to the 
enclosed areas.