NWS and GPS/GNSS Rick Koehler, PhD NOAA – NWS – OCWWS – FDTB Boulder, CO Meeting the geospatial data needs in hydrology and meteorology Images source:

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Presentation transcript:

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 workshop Boulder, 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 workshop Boulder, CO Geospatial data needs WSR-88D (aka NEXRAD) Current data1 km x 1°, 230 km range Super-res data0.25 km x 0.5 °, 300 km range Sensors Precipitation, snow pillows, temp, wind,... Spotters On site observers Real time observations, verify events Model input Page 3 Images source: NOAA

October 2007 NOAA-wide GPS workshop Boulder, 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 workshop Boulder, CO NOAA Storm surveys Page 5 NOAA

October 2007 NOAA-wide GPS workshop Boulder, CO Radar accuracy studies Page mi N WX radar derived GPS derived Source: National Weather Digest

October 2007 NOAA-wide GPS workshop Boulder, 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 workshop Boulder, CO Hydraulic model input Page 8 USGS © COMET

October 2007 NOAA-wide GPS workshop Boulder, 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 workshop Boulder, CO Current product example ? Page 10

October 2007 NOAA-wide GPS workshop Boulder, CO Employee training critical to successful projects Online information NOAA LMS COMET Other Training Page 13 Space weather Ocean tides

October 2007 NOAA-wide GPS workshop Boulder, CO Training – GPS related courses Page 14 NOAA No GPS related courses, classes, sessions

October 2007 NOAA-wide GPS workshop Boulder, CO Summary NWS requires accurate and precise geospatial data GPS/GNSS provides such information Take into account end user positioning capability Determine accuracy of product Training an important component Page 15 Questions?