IAPRS & SIS, Vol.34, Part 7, "Resource and Environmental Monitoring", Hyderabad, India, 2002
It is observed that all the four bands show least
variation during January. Band-1, Band-2 and
Band-3 show highest variation during July
whereas the highest variation in band-4 is
observed during May 1998. Further, comparison
among the four bands in any particular period
shows that except during May 1998, Band-4
radiances show least deviation as compared to
other bands while the deviation in Band-2
radiances are maximum as compared to other
bands during most of the period. Thus, the results
suggest that the use of band radiance in different
algorithms and computations of indices are
limited in Chilka lagoon where the band radiances
show significant spatio-temporal variability.
4. CONCLUSIONS
Submerged vegetation in Chilka lagoon was
studied using IRS-1B data and synchronous field
observations. Submerged vegetation in Chilka
lagoon show distinct annual cycle with the period
of growth from winter to pre-monsoon and decay
from later part of pre-monsoon to post monsoon
season. Both the vegetation coverage and the
physicochemical parameters in Chilka show
significant seasonal and interannual variability.
Variation of vegetation coverage and physico-
chemical parameter, in time-space continuum,
lead to the apparent spatio-temporal variability of
radiance characteristics of submerged vegetation,
which was studied through BBI and YSI. Both
BBI and YSI delineate the submerged vegetation
in the lagoon very well. But it appears that the
delineation of submerged vegetation is better
through YSI than BBI.
Acknowledgements
This paper. is the result of research projects
funded by the Department of Space, Government
of India under ISRO RESPOND programme and
Department of Ocean Development, Govt. of
India.
390
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