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ile using 
tion data 
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B4, 2012 
XXII ISPRS Congress, 25 August — 01 September 2012, Melbourne, Australia 
Table 2. Correlation between watershed code numbers 
their area and stream orders.? 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
Stre 
Stre am 
am Or 
Watershed Or der 
No Grade from der No. | App. Area | Watershe 
Region to micro | No. in insq.km. | d Code 
watershed in Hills 
Plai and 
ns upla 
nds 
1 Region 4 
2 | Basin 8 11 500000 4C 
and above 
3 Catchment 7 10 500000 to 4C2 
100000 
4 Sub Catchment 6 9 100000 to 4C2C 
5000 
5 Watershed 5 8 5000 to 4C2C4 
1000 
6 Sub Watershed 4 7 1000 to 4C2C4 b 
500 
7 Mini Watershed 3 6 500 to 4C2C4 
200 bl 
8 | Micro 2 5 200 to 4C2C4 
watershed gr 1 100 bla 
9 | Micro 1 4 100 to 50 4C2C4 
watershed gr 2 blal 
10 | Micro 3 50 to 10 4C2C4 
watershed gr 3 blalc 
11 | Micro 2 10 to 5 4C2C4 
watershed gr 4 blal cl 
12 | Micro 1 5tol 4C2C4 
watershed gr 5 blal cla 
  
  
  
  
  
  
Table 3. The code no of five watersheds in study area !!. 
  
  
SI Watershed Area Rev No ‚Village and Reserve Forest 
N Code No sq km 
0. 
|  4C2C4 8.58 117.Tiruppair, Nayappakkam R.F., 
b2ala 125. Poondi, 
Pullarampakkan Extn.R.F., 
2  4C2C4 12.33 114. Sengampalayam, Allikuli R.F., 
b2alb 118. Ramanjeri 
3. 4C2C4 6.26 116. Thombur, Allikuli R.F. 
b2alc 115. Greenwaynatham, 
aca 8:10 118. Ramanjeri & Poondi Reservoir 
3 a Ca 10.70 85. Kanchipadi, 118. Ramanjeri 
Totalareasq 45.96 
km 
  
4.DELINEATION OF MICRO WATER SHEDS USING 
1:50000 MAP/SATELLITE DATA. 
The map of Poondi Ramancheri mini watershed 
in Thiruvallur district (Fig 2 )and the Map of five micro 
watersheds of this Poondi Ramancheri watersheds ( Fig.3) are 
used to study the need of high resolution data to create GIS 
data base of micro watersheds. 
4.1.High Resolution satellite data for morph metric 
analysis 
The Indian Remote sensing satellite Cartosat 1, with 
2.8 m resolution stereo, PAN data dated 27" March 2007 
127 
  
merged with Liss 4, 5.8 m, Resolution multi spectral data 
dated 11 Jan 2005 is given in Fig 5 which is used to delineate 
field boundaries, drainage channels and streams. The Geo 
Eye image of Feb 2011 (Fig 4)from Google Earth web site is 
used to up date maps from Cartosat 1 2007 data. Arc GIS 10 
and Leica Photogrammetry Suite were used for analysis in 
this study. 
FORE ARRAN RE BE sie 
wm a si 
  
  
  
  
  
  
  
  
OV Oe 
Le 
Figure.4 High resolution data of area selected for analysis 2 
5.ANALYSIS 
Parts of micro watersheds 4C2C4b2ala and 4C2C4 
b2alb in 4C2C4 Poondi Reservoir Ramancheri watershed, 
are studied — for using? Cartosat 1 and recent Google 
Earth image of 2011 to explain the research methodology. 
Delineation of water sheds in this fluvial basin is difficult by 
manual survey as the man made irrigation channels, natural 
drainage channels have to be clearly identified. The fig