(a) SPOT/TM composite image 
(b) Forest area of the old land use data 
overlaid on SPOT/TM image. 
  
(c) NVI vegetation area overlaid on 
SPOT/TM image. 
(d) Candidate area for land use change 
derived from logical operation of 
(b) and (c). 
Fig. 6 Images of the land use updating 
procedure (Forest ->Non-Vegetation) 
3.2.4 Vegetation to Vegetation Renewal 
(1)The NVI vegetation areas which items 
were vegetation in the old land use data 
are extracted. These areas will be the 
candidate for no change or land use item 
change within vegetation area. 
(2) The candidate areas are colored in 
yellow and overlaid on the SPOT/TM false 
color image. 
(3)The land use change areas are selected 
by image interpretation and are enclosed 
with mouse. 
(4)The new vegetation items are assigned 
to the enclosed areas. 
3.2.5 Non-Vegetation/Water Renewal 
Similarly, old non-vegetation item areas 
and old water item areas are updated. 
3.3 Post-processing 
The land use data updated in the interac- 
tive processing sub-system are stored in 
floppy disks. In the post-processing 
system, the floppy based small size data 
are integrated to standard 1/25,000 map 
size(1000x1000) and various statistics of 
updated land use data are calculated. 
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4. EVALUATION 
4.1 Test Site and Analyzed Data 
4.1.1 Test site 
Kanagawa Prefecture was selected as test 
site for evaluating the system, and total 
of 32 1/25,000 map area data were updated 
using the system. The test site is shown 
in Fig.7. 
4.1.2 Satellite data 
* SPOT PA data(331-279) of Nov. 11,1989 
x TM data(l07-35(2)) of Nov. 2, 1989 
Fig.8 shows the TM image and SPOT/TM 
composite image of the test site. 
4.2 Result 
In order to evaluate the updated result, 
total of 30 areas were selected for evalu- 
ation, and field survey were performed. 
The result were evaluated in three levels 
as follows. 
A:Correctly updated 
B:Changed but the updated item was wrong 
C:Unchanged area was updated