3. ANALYZED DATA 
Both optical sensor data and passive microwave sensor data 
acquired from satellites were analyzed in this study. As for the 
optical sensor, data from both RSI onboard FOROMSAT-2 
satellite and MODIS onboard Aqua satellite were used. As for 
the passive microwave sensor, data from AMSR-E onboard 
Aqua satellite were used. Table 1 and 2 show the specifications 
of the three sensors. 
Table 1. Specifications of optical sensors 
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B8, 2012 
XXII ISPRS Congress, 25 August — 01 September 2012, Melbourne, Australia 
  
   
  
     
    
   
   
   
  
  
  
  
  
  
   
  
Sensor | Band Wavelength IFOV Swath 
PAN 0.45-0.90um 2m 
1 0.45-0.52um 
RSI 2 0.52-0.60um 24km 
8m 
3 0.63-0.69um 
4 0.76-0.90um 
1 0.620-0.670um 
MODIS 250m | 2330km 
2 0.841-0.876um 
  
  
  
  
  
  
  
   
  
  
Table2. Specifications of AMSR-E 
  
   
    
Frequency IFOV Swath Incident 
(polarization) angle 
  
   
   
   
   
   
   
6.925GHz (V,H) 43X75km 
  
10.65GHz(V,H) 9X51km 
  
18.7GHz (V,H) 16X27k m 
  
23.8GHz (V,H) 18X32k m 1445km 55deg 
  
36.5GHz (V,H) 8.2X 14.4 km 
  
89.0GHz (a) 3.7X6.5k m 
  
89.0GHz (b) 3.5X59km 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
   
     
4. DIRECT MEASUREMENT OF THIN ICE 
THICKNESS 
In order to evaluate the possibility of estimating thin ice 
thickness with optical sensors on board satellites, direct 
measurements of ice thickness were performed in Saroma Lake 
and Monbetsu Bay. Since the thin ices are very fragile, it is 
dangerous to stand on the ice. The authors approached to the 
thin ice on a small boat. The procedure of the ice thickness 
measurement is shown on Figure 2. The operator makes a small 
hole in the ice by using a drill (Figure 2(a)). Once the hole is 
open, the operator inserts a tape measure into the hole (see 
Figure 2(b)). A bar connected to the forefront of the tape 
measure act as a prop, and the operator can easily measure the 
ice thickness with the tape measure (See figure 2(c)). Figure 3 
show the Snapshots of the ice thickness measurement in the 
Saroma Lake. 
  
ice Pg ice 
     
(a)Open a hole in the ice with a drill. we p 
   
(b) Insert a tape measure (c) Measure ice thickness 
into the hole. with the tape measure. 
Figure 2. Procedure of direct measurement of 
ice thickness. 
   
    
(b) Measuring the ice thickness with a ape measure 
Figure 3. Direct measurement of ice thickness from a boat.