Delineating Digital Land / Water Interface Using Satellite Imagery – A Case...

Delineating Digital Land / Water Interface Using Satellite Imagery – A Case Study of Karwar Harbour

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Rajesh Kumar
Rajesh Kumar
Principal Civil Hydrographic Officer,
[email protected]

G. S. Vatsa
Assistant Chief Civil Hydrographic officer,
[email protected]

National Hydrographic Officer
107-A, Rajpur Road,
Dehradun, India

Abstract
Maritime Defense is one of the foremost tasks of Navy of any Nation since they are major users of nautical chart product. The updating of nautical charts is the responsibility of a Hydrographic Office, which it does by collecting all the information on any modifications. Existing maps of coastal areas of the Indian National Hydrographic Office although have been made digital but they still requires regular updation in terms of coastal changes so as to provide mariners an updated digital charts i.e. Electronic Navigational Charts (ENCs) and hence in this context there is an urgent need to produce Navigational Chart of Coastal Areas which were published by using Hydrographic surveys. The Navigational Charts with a recent digital vector shoreline delineated from satellite imageries of coastal area does not exist. Therefore the need is to produce accurate and current spatial coastline information to study the coastal dynamics of the complex Coastal Zone environment in the region is evident. Automated measurement of shoreline features and attributes, depiction and analysis of spatial characteristics, proximity analysis, and other spatial functions require the use of a digital vector land/water interface in a GIS system. The objective of this paper is to produce an accurate digital representation of the Karwar coastal land/water interface for use in GIS systems. These systems will, in turn, be employed to assist in recourse planning and development activities for Projects

This paper evaluates techniques for change detection and delineation of the coastline from 23.5-meter resolution IRS 1C/1D LISS satellite imagery. IRS Infra red Band was the most reliable methodology, and a digital raster land/water interface map and vectorized shoreline was generated for the entire coastline of Karwar using this method. Developing the digital shoreline boundary requires use of image processing techniques applied to satellite imagery. The experimental techniques, test results, evaluation, final methodology, and applications are explained and described in this paper