netcdf library version 3.6.1 of Feb 3 2008 23:15:25 $
HFRNet_1.0.0b2
HFRNet_1.1.01
CF-1.1
Near-Real Time Surface Ocean Velocity
Scripps Institution of Oceanography
Surface Ocean HF-Radar
12-Mar-2008 22:26:19: NetCDF file created
Terrill, E. et al., 2006. Data Management and Real-time
Distribution in the HF-Radar National Network. Proceedings
of the MTS/IEEE Oceans 2006 Conference, Boston MA,
September 2006.
Mark Otero
motero@mpl.ucsd.edu
http://cordc.ucsd.edu/projects/mapping/
Surface ocean velocities estimated from HF-Radar are
representitive of the upper 0.3 - 2.5 meters of the
ocean. The main objective of near-real time
processing is to produce the best product from
available data at the time of processing. Radial
velocity measurements are obtained from individual
radar sites through the HF-Radar Network and
processed to create near-real time velocities
(RTVs)
21.7359600
46.4944191
-97.8838501
-57.2312088
6km
equidistant cylindrical
Unites States, East and Gulf Coast
time
-97.8839 21.736
-57.2312 46.4944
2008-03-27T16:00:00.000Z
urn:ogc:def:crs:EPSG::4326
time
seconds since 1970-01-01
gregorian
latitude
degrees_north
longitude
degrees_east
surface_eastward_sea_water_velocity
m s-1
-32768
0.00999999978
DOPx
surface_northward_sea_water_velocity
m s-1
-32768
0.00999999978
DOPy
longitudinal dilution of precision
The longitudinal dilution of precision (DOPx) represents the
contribution of the radars' configuration geometry to
uncertainty in the eastward velocity estimate (u). DOPx is a
direct multiplier of the standard error in obtaining the
standard deviation for the eastward velocity estimate from the
least squares best fit. DOPx and DOPy are commonly used to
obtain the geometric dilution of precision
(GDOP = sqrt(DOPx^2 + DOPy^2)), a useful metric for filtering
errant velocities due to poor geometry.
-32768
0.00999999978
latitudinal dilution of precision
The latitudinal dilution of precision (DOPy) represents the
contribution of the radars' configuration geometry to
uncertainty in the northward velocity estimate (v). DOPy is a
direct multiplier of the standard error in obtaining the
standard deviation for the northward velocity estimate from the
least squares best fit. DOPx and DOPy are commonly used to
obtain the geometric dilution of precision
(GDOP = sqrt(DOPx^2 + DOPy^2)), a useful metric for filtering
errant velocities due to poor geometry.
-32768
0.00999999978
Contributing radar site latitudes
latitude
degrees_north
Contributing radar site longitudes
longitude
degrees_east
Contributing radar site code
25
Contributing radar site network affiliation code
25
RTV processing parameters
01) Maximum GDOP threshold
02) Maximum speed threshold (cm s-1)
03) Minimum number of sites required
04) Minimum number of radials required
05) Maximum angular gap to interpolate radial
data over (degrees, 0 = no interpolation)
06) Maximum gap in range to interpolate radial
data over (range-resolution, 0 = no interpolation)
07) Spatial search radius for radial solutions (km)