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I am new to GIS . I hava a folder it include a .mxd file and a .gdb folder, the .gdb folder hava many .gdbtable and .gdbindexes files etc, it's a road network data of a city. Now, I want to know which road it belongs to for a given latitude and longitude, which software or sdk should I use? is there have a similar open source project?

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You can use Spatial Join (Analysis) to join the information of the nearest road to your point (lat/long).

It will create another field in your point layer that belongs to the name of the nearest road.

See ya.

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Near (Analysis) can be used to find the nearest line feature to each point feature. The tool will create a new field called 'NEAR_FID' in the point feature attribute table which holds the identifier of the nearest line. A distance field is also created if this of use to you.

This tool is available in ArcGIS for Desktop with an ADVANCED license level only.

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