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Figure 1-20.A GOES 8 EC1 infrared sector taken at 2145 UTC, June 21,1995.
DIRECT-READOUT  SERVICE

Aerographers Mate, Module 03-Environmental Satellites and Weather Radar
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the sector was generated, such as "D" for Washington, D.C, or "S" for San Francisco. The next letter indicates the sector resolution in kilometers, that is A= 1 km, B = 2 km, C = 4 km, and D = 8 km (IR only). The last digit indicates the identification number of the specific sector. GOES TEMPERATURE SCALE The temperature scale appears only on IR and WV imagery,  and  it  appears  below  the  legend.  The temperature scale is divided into 10°C increments with a range from +50°C to -100°C. It has 15 temperature blocks separated by white or black vertical lines. The temperature scale is very useful in cloud and non-cloud identification. Q25. Q26. Q27. Q28. Q29. REVIEW  QUESTIONS What  is  the  purpose  of  enhancing  satellite imagery? What is a major disadvantage of providing too much definition to user-defined enhancement curves? Which type of user-defined enhancement curve applies two complete gray-shade and count value  scales  for  two  separate  temperature ranges? What is indicated in column 6 of the GOES legend? The  GOES  temperature  scale  is  normally divided into segments of how many degrees? METHODS  OF  ACQUIRING  IMAGERY LEARNING OBJECTIVE: Identify the various methods   used   to   acquire   environmental satellite imagery. There   are   several   ways   to   receive   satellite imagery:  weather  facsimile  broadcast;  Navy  Ocean- ographic Data Distribution System (NODDS); GOES Telecommunications Access Program (GOES-TAP); satellite  direct-readout  service;  weather  facsimile  ser- vice (WEFAX); the Internet; and AUTODIN message. WEATHER  FACSIMILE  BROADCAST Some ships may receive a low quality satellite image  as  part  of  the  U.S.  Coast  Guard  facsimile broadcast. Transmitted via high-frequency (HF) radio, this broadcast transmits National Weather Service charts  and  satellite  imagery  on  a  fixed  schedule. Schedules  and  frequencies  for  facsimile  broadcasts originating from CONUS stations (San Francisco, New Orleans, Boston, and Kodiak) are available over the Internet. Several other countries, such as Japan and India,  also  transmit  weather  charts  and  satellite imagery via HF.   A listing of all maritime weather broadcast frequencies is available in the latest edition of  Worldwide  Marine  Radiofacsimile  Broadcast Schedules  published by NOAA. NAVY OCEANOGRAPHIC DATA DISTRIBUTION  SYSTEM The  Navy  Oceanographic  Data  Distribution System (NODDS) is a dial-up data service available from  FNMOC.  Although  originally  designed  to transmit  graphical  data  fields  for  portable  computer systems,  selected  satellite  imagery  is  now  available within a few hours of sensing. Authorized users may access the system from anywhere in the world via computer  modem  through  the  U.S.  Govemment- owned  Internet  routing  networks  or  via  direct  long- distance  telephone  connection  on  commercial  or Defense  Switched  Network  (DSN)  lines.  Information on NODDS satellite imagery is available in the Navy Oceanographic  Data  Distribution  System  Products Manual. All of the satellite data available on NODDS is from  DMSP  satellites.  The  pictures  that  actually appear on your computer monitor may not be quite as clear as imagery from other sources. The imagery is considered near real-time in that it is available to the user usually within a few hours of sensing.  The  DMSP satellites collect imagery, store the information as digital data aboard the satellite, and then dump the imagery data on command as it comes within range of a receiver  site  capable  of  copying  high-resolution imagery.    DMSP  imagery  for  specific,  high-interest areas  around  the  world  may  be  requested  from FNMOC  after  some  coordination. GOES  TELECOMMUNICATIONS  ACCESS PROGRAM  (GOES-TAP) Ashore, Navy and Marine Corps weather stations receive  satellite  imagery  primarily  from  the  GOES- TAP service. The GOES-TAP service is operated by NESDIS,  and  satellite  images  are  provided  via dedicated  telephone  circuits.  The  circuits  are  leased from  commercial  telephone  companies  and  are maintained by the telephone companies that own them. Routine satellite images are transmitted at 15-minute intervals. The imagery is normally displayed on a 1-21







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