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A complete ALOV Map application is consituted of three elements :
CLIENT
- a thin HTML client, which enables the user to perform URL requests to ALOV driven Web Map Service and obtain maps rendered in a pictorial format such as GIF or JPEG.
OR
- a client applet, which enables the user to retrieve and handle the vector and raster map using the map tools (zoom, pan, select...) and applet's components.
GIS DATA
Vector
- ESRI shapefiles can contain points, multipoints, polylines and polygons objects. The attribute data should be in dBaseIV.
- MapInfo MIF should be in pair with DBF (dBaseIV) file not with MID. MIF can contain REGION, PLINE MULTIPLE, PLINE, LINE and POINT. All objects must be of the same type.
- SQL database. Currently Interbase, MySQL, MSSQL and Hypersonic are being tested. It is supposed that any SQL server with JDBC driver can be used. There is a dedicated WWW interface to upload data from shape or MIF files to an SQL database and to register them in ALOV Clearinhouse base.
Raster
SERVER and CLEARINGHOUSE DATABASE
ALOV Map's server side is implemented using Java® servlets.
Clearinghouse database is an SQL database or an XML document includes records where the description of GIS datasets is stored.
These records include descriptive data for resource discovery allowing identification of resources relevant to a particular place, time or thematic interest. They also contain connection parameters for each dataset which allows server to connect to the data servers across the Internet (or to local files).
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