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I want to recreate this resource that helps locating your site when you set up a project, but for the Los Angeles area. Martyn Horne created this for UK users and it's great, because you can zoom out at any time get the full context and verify your setup. It's a map of the UK and a series of grids starting with the main grid that everybody tends to use (EPSG: 27700 - OSGB 1936 / British National Grid, units metre). The U.S. seems to be more complicated. First question. which Coordinate Reference System should I choose for Los Angeles, for instance, and which units? Second question, what distances are the grid lines as I work myself down to smaller grids? In the UK it's 100 km between each gridline for the national grid, 10 km between lines for the south-east England tile, then for local area 1 km gridlines, then 10 m for the local survey.
