NWS and GPS/GNSS Rick Koehler, PhD NOAA – NWS – OCWWS – FDTB Boulder, CO Meeting the...
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NWS and GPS/GNSS Rick Koehler, PhD NOAA – NWS – OCWWS – FDTB Boulder, CO Meeting the geospatial data needs in hydrology and meteorology Images source: NOAA
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Transcript of NWS and GPS/GNSS Rick Koehler, PhD NOAA – NWS – OCWWS – FDTB Boulder, CO Meeting the...
NWS and GPS/GNSS
Rick Koehler, PhD
NOAA – NWS – OCWWS – FDTB
Boulder, CO
Meeting the geospatial data needs in hydrology and meteorology
Images source: NOAA
October 2007 NOAA-wide GPS workshopBoulder, CO
Outline
Geospatial data needs
Precise time transfer
Storm surveys
Radar accuracy studies
Hydraulic model input
Product reality check
Training
Page 2
October 2007 NOAA-wide GPS workshopBoulder, CO
Geospatial data needs
WSR-88D (aka NEXRAD)
Current data 1 km x 1°, 230 km range
Super-res data 0.25 km x 0.5 °, 300 km range
SensorsPrecipitation, snow pillows, temp, wind,...
SpottersOn site observers
Real time observations, verify events
Model input
Page 3
Images source: NOAA
October 2007 NOAA-wide GPS workshopBoulder, CO
Precise time transfer
The “GPS clock” is used for high-resolution date/time stamping of each radar transmit pulse. This aids in the sharing, recovering, cataloging, archiving, and analyzing time-series data.
USGS
NOAA
Symmetricom ©
Time stamped
NOAA
Page 4
October 2007 NOAA-wide GPS workshopBoulder, CO
NOAA
Storm surveys
Page 5
NOAA NOAA
NOAA
October 2007 NOAA-wide GPS workshopBoulder, CO
Radar accuracy studies
Page 6
0 20 mi
N
WX radar derived
GPS derivedSource: National Weather Digest
October 2007 NOAA-wide GPS workshopBoulder, CO
Least squares fitted line
(12.8 km)
(161 km)
12 km
(6.4 km)
Page 7
Figure 3.
Radar accuracy results
Source: National Weather Digest
October 2007 NOAA-wide GPS workshopBoulder, CO
Hydraulic model input
Page 8
USGS
© COMET
October 2007 NOAA-wide GPS workshopBoulder, CO
Product reality check
Page 9
2 miles or is it really
2 miles, ± 1.5 mile?
Does your agency issue products with geospatial information?
How well can end users position themselves?
What happens when the two meet?
- In other words, how good are your products?
October 2007 NOAA-wide GPS workshopBoulder, CO
Current product example
?
Page 10
October 2007 NOAA-wide GPS workshopBoulder, CO
Employee training critical to successful projects
Online informationNOAA LMS
COMET
Other
Training
Page 13
Space weather Ocean tides
http://www.comet.ucar.edu
http://www.meted.ucar.edu
October 2007 NOAA-wide GPS workshopBoulder, CO
Training – GPS related courses
Page 14
NOAA
No GPS related courses, classes, sessions
https://doc.learn.com
October 2007 NOAA-wide GPS workshopBoulder, CO
Summary
NWS requires accurate and precise geospatial data
GPS/GNSS provides such information
Take into account end user positioning capabilityDetermine accuracy of product
Training an important component
Page 15
Questions?
