1. L ow R ate I nformation T ransmission Product Suite Satellite Direct Readout Conference for the Americas in Miami, Florida December 9-13, 2002 1 Charles Vance charlie.vance@noaa.gov

2. L R I T  Sometimes referred to as: Digital WEFAX High Speed WEFAX Next Generation WEFAX  LRIT is more than WEFAX Satellite Direct Readout Conference for the Americas in Miami, Florida December 9-13, 2002 2

3. 01:00 17Z 72Hr MSLP/1000-500 THK 01:05 17Z 72Hr 500MB HT PA33 W502 01:10 GOES-8 2345Z NE IR 01:14 GOES-8 2345Z SE IR 01:18 GOES-8 2345Z NW IR 01:22 GOES-8 2345Z SW IR 01:26 GOES-8 2345Z 4KM US IR 01:30 GOES-8 2345Z 16KM FD IR 01:34 GOES-8 2345Z NH WV 01:38 GOES-8 2345Z NE WV 01:42 GOES-8 2345Z SE WV 01:46 GOES-8 2345Z NH WV 01:50 GOES-8 2345Z SW WV 01:54 GOES-8 0045Z NH IR 01:58 GOES-8 2345Z 16KM FD WV WEFAX (Weather Facsimile) Transmits only images using low rate facsimile, 24 hours a day on a fixed schedule of 4 and 5 minute time slots PRODUCTS GOES EASTGOES WEST 135 GOES132 GOES 59 NWS Charts 58 NWS Charts 44 NOAA Polar 2 TBUS 3 msg files 67 Meteosat 7 Meteosat 40 GMS Satellite Direct Readout Conference for the Americas in Miami, Florida December 9-13, 20023

4. L R I T (More than WEFAX)  Integrated Stream of Digital Products that can be Transmitted Asynchronously  Improved Image Resolution  Can Utilize Compression  Diverse Product Suite  Digital Text Messages! Satellite Direct Readout Conference for the Americas in Miami, Florida December 9-13, 2002 4

5. Initial LRIT Product Suite Used WEFAX as a Baseline and –Reduced latency –Increased resolution –Improved user flexibility Also added other services such as –NWS messages including EMWIN –DCS Evolving Capabilities and Products Satellite Direct Readout Conference for the Americas in Miami, Florida December 9-13, 20025

6. Geostationary Satellite Data Polar Satellite Data GOES Data Collection Service NWS Data (including) Models/Charts EMWIN L R I T Integrated Stream of Digital Products Text and Administrative Messages Satellite Direct Readout Conference for the Americas in Miami, Florida December 9-13, 20026

7. GOES Imagery Example WEFAX Limitations Resolution Limitations –Pixel Area limited by 2.4KHz modulation –Pixel Depth (brightness) roughly 6.5 bits Latency –One Daytime GOES Full Disk Ingest generating 14 WEFAX image products takes 56 minutes to transmit –Initial processing delays of 25 minutes –Scheduling – images sent one after another Satellite Direct Readout Conference for the Americas in Miami, Florida December 9-13, 2002 7

8. 14 WEFAX PRODUCTS FROM 1 DAYTIME FULL DISK 8 KM Northern Hemisphere and Quadrants 16 KM Full Disk4 KM CONUS IR WVIRVIS IR WV IR VIS Satellite Direct Readout Conference for the Americas in Miami, Florida December 9-13, 20028

9. LRIT Transmits Full Disk in near real time segments for improved reliability and less latency User can generate sectors for areas of interest Missing segment does not negate entire transmission Total Transmission time of approximately 20-25 minutes Slightly longer than normal GVAR transmission Satellite Direct Readout Conference for the Americas in Miami, Florida December 9-13, 20029

10. LRIT Viewer Screen Shot GOES-10 8 Km IR Satellite Direct Readout Conference for the Americas in Miami, Florida December 9-13, 2002 10

11. LRIT Viewer Screen Shot GOES-10 8 Km IR Missing Segment w Overlays Satellite Direct Readout Conference for the Americas in Miami, Florida December 9-13, 2002 11

12. LRIT Viewer Screen Shot GOES-10 8 Km IR Missing Segment w Zoom Satellite Direct Readout Conference for the Americas in Miami, Florida December 9-13, 2002 12

13. LRIT Viewer Screen Shot GOES-8 8 Km IR Satellite Direct Readout Conference for the Americas in Miami, Florida December 9-13, 2002 13

14. LRIT Viewer Screen Shot GOES-8 8 Km IR with Zoom and Overlay Satellite Direct Readout Conference for the Americas in Miami, Florida December 9-13, 2002 14

15. GOES Imagery Example LRIT Improvements Resolution –Pixels per line variable and ‘unlimited’ –Pixel Depth of 8 bits (generally) Latency –Initial processing delays minimized –One Daytime GOES Full Disk Ingest sent in segments taking 20 – 25 minutes to transmit –Scheduling – multiple products sent ‘simultaneously’ Satellite Direct Readout Conference for the Americas in Miami, Florida December 9-13, 2002 15

16. LRIT Viewer Screen Shot (Compressed) GMS with ZOOM (Embedded Overlays) Satellite Direct Readout Conference for the Americas in Miami, Florida December 9-13, 2002 16

17. LRIT Receiver Screen Shot Satellite Direct Readout Conference for the Americas in Miami, Florida December 9-13, 2002 17

18. Time Share of WEFAX and LRIT During Transition 05 00 30 50 15 45 40 55 10 20 25 35 Reduced Product Suite for Each Service Alternates Each Hour WEFAX GOES Images NWS Charts GMS Meteosat? LRIT GOES NWS products Models/Charts EMWIN GMS GOES DCS channel? Satellite Direct Readout Conference for the Americas in Miami, Florida December 9-13, 2002 18

19. Summery LRIT is an Integrated Stream of Diverse Digital Products that can be Transmitted Asynchronously and has Reduced Latency, Improved User Flexibility, Increased Resolution, and Increased Reliability compared to WEFAX The LRIT Product Suite is User Driven Satellite Direct Readout Conference for the Americas in Miami, Florida December 9-13, 2002 19

20. Are you ready? Email: LRIT@NOAA.GOV http://www.osdpd.noaa.gov/COB/COB.html http://noaasis.noaa.gov/WEFAX/ ( /LRIT/ ? ) http://www.nws.noaa.gov/datamgmt/doc/lrit.html Satellite Direct Readout Conference for the Americas in Miami, Florida December 9-13, 2002 20