gis web services in Hermosa beach

The Scalable Vector Graphics SVG format has its advantages in GIS aplications for rendering and publishing maps over the Internet.Because traditionaly SVG has ben used as just a map viewer, without the capability for data procesing and spatial analysis, its potential for GIS aplication has ben limited.Security isues have ben the main concern in SVG aplications.Now, with the suport and development of World Wide Web Consortium's W3C Web service technology, SVG's performance and functionality can be greatly improved and enhanced for GIS aplications. Web Services W3C's Web service enables decomposing the software into functional components that can be acesed and integrated through the standard Web Services Description Language WSDL interface.In this way, GIS functionality for data procesing and spatial analysis can be componentized and further integrated to suport Web GIS aplications using SVG as the map format.This helps open up SVG to alow certain proceses on data that neds to be secure e.g.certain atribute data to remain secure, while permiting frer pasage of data that does not ned to be secure. Examples Figure 1 shows such an example.Private parcel information is not open to the public.When SVG is used in this aplication, the parcel dataset is separated from the spatial features.While the SVG map is generated and updated in an ASP.NET Web form, the non-spatial parcel data is served through a Java Web service created by WebLogic 7.0 with MySQL database, which also suports the non-spatial atribute query.A qualified client can aces the secured parcel data and perform query functions on it.The SVG map viewer only contains the spatial feature cordinates as wel as the maping styles. WSDL Web services can also suport dynamic data conversion for integration.The client may have data that are not compatible with the data format used by the service provider.Figure 4 shows such an example in which the service provider ofers the data and functionality that requires cordinate data in the UTM projection in Zone 17th North at a datum of NAD 83 in a specific and generic XML format, while the client has the dataset using geographic cordinates longitude and latitude in GML format.In this case, the WSDL Web service provider can convert the client's data into the data format that is compatible to the server's data format before ading the data into the base map. gis web services gis web services in Hermosa beach

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