Digital Signal Processing Reference
In-Depth Information
4.2.1.
Surface Water Quality Geo-Database
GIS technology advances over the past several years provide effective and efficient data management
for processed hydrographical and hydrodynamic data. The geo-database model lends itself well to
database designs and applications associated with the collection, documentation, distribution, and
analysis of large amounts of vector, raster, and surface modeling data (i.e., a data warehouse). The
geo-database as a database model has two major concepts. First, a geo-database is a physical store of
geographic information inside a DBMS. Second, a geo-database has a data model that supports
transactional views of the database (versioning) and also supports real-world objects with attributes
and behaviour (intelligent features). Behaviour describes how an object can be edited and displayed.
The coming section explains in details the structure of the developed geo-database for the WQMIS
and its different components.
The water quality geo-database is developed using Arc-GIS software embedded applications (geo-
database and visual basic programming tools). The developed system is composed of three main
modules to organise and structure the data used in the WQMIS, these modules are: the catchment
component, lake component, modelling and analysis outputs.
Figure (4-2)
gives an overview of the
database in Arc-GIS environment.
Figure (4-2): Water quality geo-database in Arc-GIS environment.
Since the different modelling components requires a huge numbers of preparation input files and a
large number of output files the geo-database is designed to store and retrieve all types of data files
needed for the development and operation of water quality models. It includes, hydrographic survey
data, GIS layers of the system under investigation, spatially referenced water quality data, satellite
images and processed images, spectral water quality measurements,...etc. Outputs from different
models are stored within the developed system to be retrieved at any time for analysis or
interpretation.
The different parts of the database aims at structuring the different needed datasets for each modelling
component, therefore the catchment part includes the main GIS layers that are used in the 1D-2D
hydrodynamic model and the associated datasets needed for the model inputs. For the lake part the
datasets are divided into GIS layers, satellite images used for system delineation and for models
calibration at different stages, and the meteorological and hydrological datasets needed for the detailed
hydrodynamic model, and the water quality historical data and measured data linked to geographic
locations of monitoring stations and field work selected measuring sites. The modelling and analysis
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