Estimation of Centre and Intensity of Tropical Cyclones over the North Indian Ocean Using Microwave Imageries - Monitoring and Prediction of Tropical Cyclones in the Indian Ocean and Climate Change - page 194

Fig.2: Average differences of intensity ( T number) estimated by Satellite Division
(IMD) and Navy NRL.
Fig. 3: Difference in intensity ( T microwave - T Dvorak ) based on microwave estimates of
Navy, NRL and Dvorak estimates of IMD.
3.2 Comparison of Location of Centre of CDs
Differences in the location of centre of CD are determined intensity-wise
( T number-wise) based on estimates of Satellite Meteorology Division of IMD
and Navy NRL and the results are shown in Fig. 4. The average difference in
location is about 82 km. It is observed that difference is higher (more than 100
kms) when intensity is T1.0 or T1.5. It may be due to the fact that when the
system is weak, centre determination by using visible or infrared imagery alone
is difficult. As the intensity increases difference becomes less. It may be noted
that with the increase of intensity number of observations becomes less. Hence
the relatively higher difference in location of the centre in case of T5.5 and
T6.0 may not be representative to draw any general inference. Considering the
cases such as T 2.5; 3 < T 4.5; T 5 assigned by satellite division of IMD,