1 Meteorological Satellite Data Serving capability in China Meteorological Satellite Data Serving capability in China SunAnLai NSMC/CMA Jun 1, 2005

2 Topics 1.Satellite data acquisition, processing and Serving flow in NSMC 2. Introduction of DVB-S satellite data broadcasting system 3. Introduction of satellite data serving through website 4. Future plan

3 Section One Main data acquisition, processing and serving flow in NSMC

4 Meteorological Satellite Ground Stations For Data Acquisition: There is 4 ground stations belongs to NSMC(National Satellite Meteorological Center), they located in Beijing, Guangzhou, Urumchi, Lhasa. Beijing Guangzhou StationLongitude/LatitudeSatellites Acquisition Beijing116.28°E,40.05°NFY-2C, FY-1D, NOAA16,17, EOS Terra/Aqua, GOES- 9,Meteosat-5 Guangzh ou °E,23.16°NFY-1D, NOAA16,17, EOS Terra/Aqua Urumchi87.57°E,43.86°NFY-1D, NOAA16,17, EOS Terra/Aqua Lhasa91.01°E, 29.40°NEOS Terra/Aqua

5 Ground stations for data acquisition BeiJing GuangZhou Urumchi Lhasa

6 Data coverage:

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8 Meteorological Satellite Data Archiving System in NSMC Two IBM P690 Servers SAN storage system with 64TB disk array a IBM tape library(Capacity of 1500TB) It can meet archiving demands of the NSMC ’ s meteorological satellites data in future 8 years.

9 Data Archiving policy To all current and future satellites Data store on-line for three months Data store near-line for three years Migrate out of tape library after three years Dual copies for data safety.

10 1 Serving Mode of Meteorological Satellite Data Use DVB-S system to broadcast Satellite Data. Provide network service (retrieval and download) through internet.

11 2 Meteorological Satellite Data Provided to users All Level-1B Data. Higher Level Products.

12 Section Two Introduction of DVB-S satellite data broadcasting system

13 1 What’s DVB-S? DVB-S is a digital video broadcast by communication satellite system used to distribute data. USERS DVB UPLINK NSMC Broadcast China Star-1 data

14 2 Why we use DVB-S in China? Data network in China is still in developing. The bandwidth of network is not wide enough for data distribution. Users have to install expensive receiving system to receive meteorological satellite data directly.

15 3 Current Status of DVB-S System The initial purpose of DVB-S is to provide EOS-MODIS data sharing for national users. Now it become a environmental satellite data sharing platform. Since this system get into operation in the middle of 2004, over 70 users installed DVB-S user station.

16 Steps Jun 2004: start of operations with 6Mb to distribute MODIS data through China Star- 1 satellite.China Star-1 is positioned above 87.5E. Sep 2004: added FY-1D CHRPT, NOAA HRPT data. May 2005: added FY-2C S_VISSR data

17 EIRP Coverage:It cover china and around.

18 Advantage Flexible: configurable bandwidth, multicast. Supports more 8192 users. Fast distribution capability: 6Mb bandwidth. Could be upgraded easy if necessary. Priority: Data to be uplinked could be arranged priority.

19 Advantage Large coverage: China and surrounding china, Totally more 19 Asia countries are under it ’ s footprint. Low cost: Client device is very cheap.

20 DVB-S Uplink Station

21 Parameters for Uplink  Site ： Beijing(116.91°,39.90°)  Uplink Antenna: 4.5M  Amplify ：  Carrier: Single  Band ： 6MHz  Uplink Central Frequency :14175MHZ  Rate: 5920KHz(Char Rate,4340KHz)  Code:QPSK ， 3/4FEC ， 188/204RS  Availability: ％

22 User station DVB Satellite Reception / Receiver Unit DVB Standard Hardware LNB Ku-band Satellite Dish DVB PCI Card DVB Multicast Client software PC, Hard disk, Ethernet

23 LocationEIRP(d BW) DishEb/N0(differenc e from Beijing Beijing491.8M0dB Guangzhou521.8M3dB Harbin461.8M-3dB Urumchi461.8M-3dB

24 Section Three Introduction of satellite data serving by Website

25 Open a legal account. Retrieval data by key word. Quick look compressed image Download technique documents Submit the order of interesting data Download the ordered data Now Chinese version Website has get into operation. English version is under designing and will work soon. Basic Function

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28 Data Provided In Website SatelliteData Type FY-2Full Disc Image, Segment Cloud Image, Atmospheric Motion Vectors, Precipitation Estimation, Precipitation Index, Temperature Blackbody Equivalent, Outgoing Long wave Radiation, Fog, Sea Surface Temperature, Sea Ice, Surface Solar Irradiance FY-1Level-1B Data, Sea Surface Temperature, Outgoing Long wave Radiation, Vegetation Index, Cloud Analysis, Snow Cover

29 Data Provided In Website SatelliteData Type NOAALeval-1B Data, Sea Surface Temperature, Outgoing Long wave Radiation, Vegetation Index, Cloud Analysis, Snow Cover EOS Terra/Aqua Level-1B Data GOES-9Segment Cloud Image MeteosSat-5Segment Cloud Image

30 Section Four Future plan

31 1 To improve the capability of DVB-S 1: To distribute FY2C numerical products in : To add data ordering function through Website so historic data can be broadcasted by DVB-S. BOD: Broadcast On Demand.

32 2 To provide historical satellite data service more than 20 years satellite data has been archived in NSMC SatelliteData TypeSize/FileTime Elapsed FY-1A/1BCHRPT100MB GDPT200MB FY-1C/1DCHRPT200MB99.05-now GDPT300MB99.05-now NOAA(7-17)HRPT120MB84.05-now

33 SatelliteData TypeSize/FileTime Elapsed GMS-4/5S-VISSR100MB FY-2A/BS-VISSR100MB97.09-now Meteosat-5HRI40MB99.06-now EOS Terra/AquaMODIS3GB00.12-now

34 Historical Data Reorganize 1: Rescue the archived data. 2: Reprocess such as Q.C, location and calibration 3: Make standard 1B datasets and climate datasets 4: Store data into IBM tape library 5: Provide historical data service in Website

35 The End Thank you