We map the 1,238 base station coordinates given in the D4D file ANT_POS.TSV on a standard latitude-longitude projection (left map in Figure 1).
To map the minefields, Mr. Willoughby said, the Halo Trust teams conducted topographical surveys using equipment that measured standard latitude and longitude measurements.
The Greenwich (or prime) meridian (0°) mark, which since 1884 has been almost universally recognized as the world standard for reckoning longitude, is still on display, as is a collection of early astronomical instruments.
Latitude and longitude standard error estimates were computed before the data month of October 2002 and full error ellipses after.
2) Telling Accurate Time -- The Chronometer -- One major invention of the 18th century was the marine chronometer - a clock that was accurate enough to use as a portable time standard "to determine longitude by means of celestial navigation".
When time step limitation plays no significant role, the standard (reduced) latitude-longitude grid is advocated provided that the grid is kept sufficiently fine in the polar region to resolve flow over the poles.
Marine chronometers are clocks used at sea as time standards, to determine longitude by celestial navigation.
Experimental results are presented demonstrating the method in fusing standard GPS latitude and longitude information with information from a velocity sensor.
The earthquakes shown are those with precise hypocenters, for which the standard errors of latitude, longitude, and focal depth are less than 0.1°, 0.1°, and 20 km, respectively.
Figure 2(b) shows the 31 relocated hypocenters of the mainshock and aftershocks for which the standard errors of latitude, longitude, and focal depth are <0.03°, <0.03°, and <5 km, respectively.
