Tham khảo tài liệu 'current issues of water management part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Web-Based Decision Support Framework for Water Resources Management at River Basin Scale 49 Fig. 3. Web-GIS service for the developed platform Fig. 4. Search Tool of GeoClient - Web-GIS service application of ODeCav modelling system Map legend can be customized by the user it s possible to change the colour of the displayed themes set their classification according the values of numeric fields and show graphics bars or circles for numeric fields. For each object represented on the map there is a field associated on the database that is used for representing their labels on the main view. This feature can be assigned automatically for all entities of the map or placed entity by 50 Current Issues of Water Management entity. The user has the possibility to define graphical properties of these labels. Finally the application allows the automatic export of the map for later viewing on the Google Earth application. The export module is designed to convert the different coordinate data used by the two applications Figure 5 . Fig. 5. Export of geographical features to Google Earth compatible data format In addition it was developed an application to present detailed information about the river network. The application allows making a virtual visit to the rivers enabling to locate relevant features that are relevant for the rivers hydrodynamics eg. dams weirs controlled gates and water quality eg. waste water treatment plants industries . Navigation is driven by selection of river segments. The user selects the river to visualize from an initial map. Then the navigation tools and the interactive legend allow the user to activate deactivate the selected themes. This application allows the visualization of all the alphanumeric data associated with all the entities and to display photos if available. The information management operations are performed on the database. Operations like insert update edition addition or deleting are performed with proper tools for databases .
