Abstract

As stipulatedby the 83/2000/QĐ-TTg Decision, map coordinates must be stored and displayed following the national coordinate system VN-2000. However, in practice, specialy in Global Positioning System field, coordinates are first recorded in WGS84 system and therefore later on have to be converted to VN-2000. The conversion of coordinates back and forth can be performed by a number of specialized commercial softwares. However, instead of using specialized commercial softwares, this paper develops an online coordinate transformation system based on client/server model. The newly developed converter enables user with web browser, like firefox, to perform coordinate transfromation between the two coordinate systems without using specialized commercial softwares. To validate the capability of the proposed converter, an experiment is carried out in which coordinates of 100 random data points within Viet Nam boundary are transformed back and forth between the two coordinate systems. The results received from the proposed online coordinate converter are closed to the results received using open source javascript library Proj4js.