Manzul Kumar Hazarika 
  
varies from 60m to 75m (3.00mm to 3.75mm), giving a maximum error of 11m. In LANDSAT TM data, width of the 
road section varies from 50m to 70m (2.50mm to 3.50mm) with a maximum error of 14m. 
ADEOS ADEOS 
Panchromatic Multispectral 
SPOT 
Panchromatic 
SPIN 2 LANDSAT TM 
  
  
  
  
  
pom 
   
  
  
  
  
  
  
  
  
  
  
  
  
  
  
Figure 4 Estimation of width of 64m wide road using images from different sensors 
Roads having a width of 35m can be measured, using data from all the five sensors. In SPIN-2 data, width varies from 
34m to 36m (4.25mm to 4.50mm) with a maximum error of 1m. ADEOS Panchromatic data and SPOT Panchromatic 
data can estimate the width of the same road section in between 30m to 40m (1.50mm to 2.00mm) with a maximum 
error of Sm. In ADEOS Multispectral data, width of the road varies from 30m to 45m (1.50mm to 2.25mm) and 
maximum error in this case is 10m. In LANDSAT TM data, the width of the road section varies from 25m to 45m 
(1.25mm to 2.25mm) with a maximum error of 10m. 
Width of a 15m wide road varies from 14m to 16m (1.75mm to 2.00mm) in SPIN-2 data, giving a maximum error of 
Im. Width of the same section of road varies from 15m to 20m (0.75mm to 1.00mm) in ADEOS Panchromatic and 
SPOT Panchromatic data with a maximum error is 5m in both the cases. Such a road (15m in width) can not be 
identified in ADEOS Multispectral or LANDSAT TM data. 
In SPIN 2 data, a 5m wide road varies from 4m to 6m giving a maximum error of 1m. 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
1 2 3 4 3 6 7 8 
Actual | Satellite sensors Range of Range of | Mean Error Range of Maximum 
width road width | estimated (5-1) error error 
in image width (4-1) 
milli meter meter meter meter meter meter 
SPIN-2 8.00-8.25 64-66 65 1 0-42 2 
ADEOS Pan 3.00-3.50 60-70 65 1 -4 - +6 6 
64m | SPOT Pan 3.00-3.50 60-70 65 1 -4 ~ +6 6 
ADEOS Mul" 3.00-3.75 60-75 67.5 3.5 4-11 11 
LANDSAT TM 2.50-3.50 50-70 60 -4 -14 ~+6 14 
SPIN-2 4.25-4.50 34-36 35 0 -1~ +1 1 
ADEOS Pan 1.50-2.00 30-40 35 0 -5~4+5 5 
35m | SPOT Pan 1.50-2.00 30-40 35 0 -5~45 5 
ADEOS Mul 1.50-2.25 30-45 37.5 2.5 -5 - +10 10 
LANDSAT TM 1.25-2.25 25-45 35 0 -10 ~ +10 10 
SPIN-2 1.75-2.00 14-16 15 0 -1~ +1 1 
ADEOS Pan 0.75-1.00 15-20 17.5 2.5 -0~ +5 S 
15m | SPOT Pan 0.75-1.00 15-20 17.5 2.5 -0~ +5 5 
ADEOS Mul - - - - - - 
LANDSAT TM - - = - = = 
SPIN-2 0.50-0.75 4-6 S 0 -1~ +1 1 
ADEOS Pan - 2 = = = - 
5m SPOT Pan - - = = - - 
ADEOS Mul = = - - = = 
LANDSAT TM = = - = ^ - 
  
Table 2 Estimation of width of road a using analog method 
  
  
4.5.2 Estimating Width of Roads Using Digital Method 
Estimated width of the same road sections (as analog method above) using digital method is summarised in Table 3. 
Estimated width of a 64m wide road (Figure 4) varies from 62m to 64m in this method, giving a maximum error of 2m. 
In ADEOS Panchromatic data width varies from 56m to 64m, giving a maximum error of 8m whereas in SPOT 
  
370 International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B3. Amsterdam 2000.