Latitudes and longitudes
- Latitudes are parallel to the Equator and range from -90 degrees (South Pole) to+90 degrees (North Pole).
- The northern hemisphere has positive latitudes.
- The southern hemisphere has negative latitudes.
- Longitudes are perpendicular to the Equator are range from -180 degrees (International Date Line)
to +179.99999... degrees (just west of the International Date Line).
- Under this convention -- the western hemisphere has negative longitudes and the eastern hemisphere
has positive longitudes.
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UTMs
- UTM x/y coordinates are a rectangular coordinate system with units in meters from the equator
(the "y" value) and meters from a central meridian (the "x" value).
- The central meridian defines a 6 degree wide zone.
- The zone must beknown for uniqueness.
- Zone 1 starts at the International Date Line, has a central meridian 3 degrees counterclockwise
around the earth from there (-177d), and continues another 3degrees.
- Zone 2 has a central meridian of -171d (-177 - 6), and so on around the globe.
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Derivative information
- Course, speed, distance, and Eotvos are derived from pairs of positions and their associated times.
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Navigation information occurs in the
InfoBank
as:
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scattered
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< Activity-ID >.0# or
<Activity-ID>.6# files containing time sequential information.
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analog
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physical records, usually electrostatic or photostatic rolls
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metadata
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information about navigation analog paper rolls, inventory of gear, deployment of gear, operation of gear,
magnetic tapes and floppies, paper printer listings, and platform movements.
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- InfoBank navigation data file names:
- InfoBank navigation metadata file names:
- A "time"
key is associated with each record for correlation with other scattered information datasets.
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"We will be known by the tracks we leave behind." -- Dakota proverb
