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NGU has been acquiring airborne data in the Oslofjord area from early eighties until 2011. Some of the airborne surveys were performed by NGU itself and some of them were contracted to surveying companies e.g. Fugro, SGU. These airborne data were presented in various reports and stored as separate grids and databases for individual surveys. Later, it seemed necessary to compile this data together and present them as a single grid data.