CHS fetch function retrieves more maps than needed
When the south/west boundaries coincide with map division (i.e. integer lats and lons), the CHS api returns also the maps immediately south and west of the boundary. The fetch function should be modified to ensure that only the requested maps are returned.
For example, if bathymetry is request between latitutes 44-46 and longitudes 58-60, the fetch function should retrieve 4 maps with south-west corners: 44:58, 44:59, 45:58, 45:59. Instead the fetch function returns an additional 5 maps with south-west corners 43:58, 43:59, 43:60, 44:60, 45:60.
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