G PHYSICS
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G01 MEASURING; TESTING
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G01C MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
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21/00 Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
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G01C21/38 Electronic maps specially adapted for navigation; Updating thereof
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G01C21/3804 Creation or updating of map data
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G01C21/3833 characterised by the source of data
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G01C21/3841 Data obtained from two or more sources, e.g. probe vehicles
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