LevelOne GEP-5070, Руководство пользователя

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C
HAPTER
4
| Configuring the Switch
Link Layer Discovery Protocol
– 163 –
Coordinates Location
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Latitude – Normalized to within 0-90 degrees with a maximum of 4
digits. It is possible to specify the direction to either North of the
equator or South of the equator.
◆
Longitude – Normalized to within 0-180 degrees with a maximum of 4
digits. It is possible to specify the direction to either East of the prime
meridian or West of the prime meridian.
◆
Altitude – Normalized to within -32767 to 32767 with a maximum of 4
digits. It is possible to select between two altitude types (floors or
meters).
■
Meters : Representing meters of Altitude defined by the vertical
datum specified.
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Floors : Representing altitude in a form more relevant in buildings
which have different floor-to-floor dimensions. An altitude = 0.0 is
meaningful even outside a building, and represents ground level at
the given latitude and longitude. Inside a building, 0.0 represents
the floor level associated with ground level at the main entrance.
◆
Map Datum – The Map Datum used for the coordinates given in this
Option.
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WGS84 : (Geographical 3D) - World Geodesic System 1984, CRS
Code 4327, Prime Meridian Name: Greenwich.
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NAD83/NAVD88 : North American Datum 1983, CRS Code 4269,
Prime Meridian Name: Greenwich; The associated vertical datum is
the North American Vertical Datum of 1988 (NAVD88). This datum
pair is to be used when referencing locations on land, not near tidal
water (which would use Datum = NAD83/MLLW).
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NAD83/MLLW : North American Datum 1983, CRS Code 4269,
Prime Meridian Name: Greenwich; The associated vertical datum is
Mean Lower Low Water (MLLW). This datum pair is to be used when
referencing locations on water/sea/ocean.
◆
Civic Address Location – IETF Geopriv Civic Address based Location
Configuration Information (Civic Address LCI).
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Country code - The two-letter ISO 3166 country code in capital
ASCII letters. (Example: DK, DE or US)
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State - National subdivisions (state, canton, region, province,
prefecture).
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County - County, parish, gun (Japan), district.
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City - City, township, shi (Japan). (Example: Copenhagen)
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City District - City division, borough, city district, ward, chou
(Japan).
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Block (Neighborhood) - Neighborhood, block.
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Street - Street. (Example: Poppelvej)
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Leading street direction - Leading street direction. (Example: N)