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The authors propose a tool and library for collecting spatial data based on Google Maps API. The tool is implemented using AJAX and XML technology. Based on Google Earth, the user can define the interested regions by using their drawing tool. After subregions are defined, the information about the regions can be put. These information can put in the local database. Then the user can view the data by regions or types on their map. They provide library supports for drawing, overlays, graph presentation and comparison. The tool supports the KML and NMA files where the user specification can be export and the offline data in such a form can be imported to the system as well.
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