Introduction KDM Institute of Petroleum Exploration, Dehradun of ONGC Ltd. has established a comprehensive database of location, geological features and other relevant vintage data of the whole of North Eastern and some other parts of India based on field data supplemented by remote sensing satellite data1. To obtain the geographical coordinates i.e., latitude and longitude of the data points, the grid coordinates need to be given a reverse transformation in that projection system. This knowledge of the structure of the .DGN files will be of immense use to all concerned. A set of elements that logically forms a single entity. Complex elements are stored in the design file as a header followed by the component elements.
All elements begin with the standard element header and display header.
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