4 - Central Institute of Brackishwater Aquaculture
4 - Central Institute of Brackishwater Aquaculture
4 - Central Institute of Brackishwater Aquaculture
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1. Spatial data (IatitudePongitude for Geo-referenclng, the features on a<br />
map, e.g. water body spread area, administrative districts, road), and<br />
2. AttrSbutQ data (descriptive data about features, e.g. productivity <strong>of</strong> pond,<br />
population <strong>of</strong> districts, length <strong>of</strong> road etc.)<br />
13. Data Storage and Retrieval<br />
A GIs does not store maps. It stores data organized into database. The location<br />
data <strong>of</strong> different features (coordinates, topology) are generated during the<br />
digitization process. The attribute data <strong>of</strong> location are created separately. The<br />
GIs must provide the link between the location and attribute data. The relational<br />
database model is most suitable to ensure such linkage between the location and<br />
attribute data. The relational database model is most suitable to ensure such<br />
linkage and the database query language can be used to retrieve the data.<br />
Relational database concepts are therefore central to organizing and managing<br />
database in GIs. The specific format <strong>of</strong> data storage varies with the GIs<br />
s<strong>of</strong>tware.<br />
Advantages with GIS<br />
Consistency<br />
Accessibility<br />
Precision<br />
Accuracy<br />
Completeness<br />
Flexibility<br />
Refinability<br />
14. Application <strong>of</strong> remote sensing and GIS in inland fisheries<br />
14.1 Mapping <strong>of</strong> wetlands/Water body<br />
Precise inland water resource information is vital for estimation <strong>of</strong> fish yields and<br />
production. Due to global change ad anthropogenic pressure either these<br />
resource shrinking or changing their shapes. Regular estimation <strong>of</strong> water area is<br />
very much essential to estimates the yield and production <strong>of</strong> the water<br />
resources. There are various steps involved in mapping <strong>of</strong> wetlands starting from<br />
geo referencing, base map development, image processing to tabulation.<br />
Following are the basic steps Involved in water body mapping.<br />
Acquisition <strong>of</strong> remote sensing Image<br />
Geo referencing <strong>of</strong> Remote sensing Image<br />
Geo referencing is the process which creates and store control information<br />
Interpretation<br />
Remote senslng applications are limited to measuring those substances or<br />
conditions with influence and change optlcal and / or thermal characteristics <strong>of</strong><br />
surface water properties/ water quality. Suspended sediments, chlorophylls,<br />
dissolved organic matter and temperature are water quality indicator that can
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