Enterra Web GIS Embedded Flash System. Application Features 1. Dynamic data loading and caching Minimum data transfer on startup Additional data transfer.

Enterra

Web GIS Embedded

Flash System

Application Features 1. Dynamic data loading and caching

• Minimum data transfer on startup• Additional data transfer on user request • Data caching

Application Features 2. Versatility

• Any data in fixed format can be used.• Program logic is independent from data set• Java GIS Server has flexible configurations for data representation

Main System Parts •Client side (Flash, Action Script 2.0 )•Server side (Java servlet)•Web-site (PHP)•Data files (shp format) or a database

System Flow

Web-site

Serverside

(Java)Client side(Flash)

Data(shp-files

or database)result processing

script(PHP)

http-request

data

lo

adin

g

List

of o

bjec

ts s

elec

ted

( ht

tp-з

апро

с )

XML document

Data Structure• Information Objects

– define a region (state, county, town);

– hierarchical structure

– number of different layers

Data Structure• Layers

– Layers contain partial information about specific objects;

– Each layer may have a legend.

Data Structure• Layer Elements

– contain spatial data (border coordinates, town locations etc.)

Features• Data loading from

the server;

• Data visualization;

• Navigation through system objects;

Features• Statistics

Representation:

- Demography- Density of Population - Custom Information

• Layered Legend Representation;

• Layer Visibility Control:User can set each layer visible or invisible

Features• Single object

selection;

• Multiple object selection;

• Transfer information about selected objects to the web-site

Features• Scale and Scroll:

The user can scale an area and scroll it by the mouse dragging with “Shift” key;

Features• Data sorting:

- by town names

- by zip codes

Features• Synchronization with the web site page through JavaScriptSynchronization with the web site page through JavaScript