YANG Zhongdong

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National MODIS Data Sharing Platform and its
Application
YANG Zhongdong zhdyang_at_nsmc.cma.gov.cn ZHAO
Licheng National Satellite Meteorological Center
(NSMC) China Meteorological Administration
(CMA) Beijing 100081, P. R. China
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Outline
1. Why do we need the DVB-S 2. Data reception and
collecting 3. Data Broadcast and uplink
station 4. DVB-S user station 5. MODIS Data
Application 6. Summary
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1. Why do we need the DVB-S ?
Whats DVB-S? DVB-S is a Digital Video Broadcast
by Satellite system used to distribute satellite
data
Broadcast China Star-1
1B Data and Products
NSMC
USERS
DVB UPLINK
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System Architecture

Data Reception
User Station
Data Broadcast
Data Archiving
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History plan

• Its initially purpose is to provide EOS-MODIS
  data sharing for national users. Now it become a
  environmental satellite data sharing platform.
• May 2004 start of the trial through China
  Star-1 communication satellite with 2Mb.China
  Star-1 is positioned above 87.5E.
• June 2004 start of operations with 6Mb to
  distribute MODIS data.
• Sep 2004 added NOAA HRPT, FY-1D CHRPT data.
• 2005 distributed image data and numerical
  products?

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EOS-MODIS system installed in Chinese Mainland
after 2000
??
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Operational EOS-MODIS Ground Stations
Operational EOS-MODIS Ground Stations and
developing Ground Stations
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Number of system increased annually and installed
site
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• Why so many MODIS system in China?
• MODIS data is very useful for user.
• Data network in China is still in development.
  The bandwidth of network is not wide enough for
  data transfer.
• Users have to install EOS-MODIS system to receive
  data from EOS/AM and PM directly.
• Problems for MODIS user who setup directly
  reception system?
• It cost too much for users to setup MODIS system
• It cost too much for system maintains and data
  arching
• It need specialist to operate and maintains system

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Why does the DVB come out? In order to provide
satellite data to users, NSMC try to seek many
ways. Under support of China MOST (Ministry Of
Science and Technology) NSMC setup a data sharing
platform. This platform consists of Digital Video
Broadcast and Web server. Since this system get
into operation in the middle of 2004, over 70
users installed DVB-S user station and more than
200 users opened a network account from NSMC for
satellite data downloading.
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2. Data reception system and data collecting
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Ground station for data acquisition
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• Geographic locations
• 6 ground stations. Four of them belongs to
  NSMC(National Satellite Meteorological Center),
  they located in Beijing, Guangzhou, Urumuqi,
  Lasha the rest two belongs to NSOC, they
  located in Bejing and Sanya.
• Satellites 5 satellites including
  FY-1D,NOAA-16/17,Terra/Aqua

Beijing
Guangzhou
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Data coverage
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Data Availability Two stations in Beijing
backup each other, Guangzhou and Sanya backup
each other.

• ??

• ??

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• National MODIS Data Center
• We build up a data center in Beijing. It
  located in NSMCs building. The main function of
  data center are follows
• Data collecting
• Data Processing
• Data distribution
• Data archiving
• The MODIS data center consists of three IBM
  UNIX servers and a SAN storage system, a IBM tape
  library. The capacity of SAN is 3TB. It can store
  MODIS data online for one month. The data are
  migrate to tape library after month.

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Data flow Data are relayed to NSMC in real time
or slightly delay
Lasha
Wrumuqi (NSOC)
Beijing (NSMC)
Guangzhou (NSMC)
Sanya (NSOC)
NSOC
Data Collecting
Overlay delete preprocess
Beijing (NSOC)
Catalogue and Archiving
Download
Broadcast
Media Deliver
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System Architecture

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Data collecting and Broadcast band width
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Data communication bandwidth upgrade

• Sanya gt NSOCVSAT gt SDH,8Mb. Jun.2005
• Wrumuqi gt NSMCATM, 4Mb gt 10Mb Mar. 2004
• Guangzhou gt NSMCATM,4Mb gt 10Mb Mar.2004

• NSOC gt NSMCSet up LAN?100Mb (Sep. 2004)
• Lasha gt NSMCSet up SDH WAN?4Mb (AUG 2004)

• File Transfer programming for PDS file transfer
• Overlay data delete

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Data transfer time
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3.DVB-S system architecture and uplink station
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DVB-S Uplink Station
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Chinastar-1 Ku band parameters
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Parameters for Uplink

• SiteBeijing(116.91,39.90)
• Uplink Antenna 4.5M
• Amplify16W_at_Max
• Carrier Single
• Band6MHz
• Uplink Central Frequency 14175MHZ
• Rate 5920KHz(Char Rate ,4340KHz)
• CodeQPSK,3/4FEC,188/204RS
• Availability 99.97

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EIRP Coverage
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Data Broadcast Directory
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Operating log file
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DVB Satellite Reception / Receiver Unit
4.DVB-S user station
DVB Standard Hardware
LNB Ku-band Satellite Dish
DVB PCI Card
DVB Multicast Client software
PC, Hard disk, Ethernet
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5. MODIS Data Application

• MODIS L1 Data
• MODIS Cloud Mask
• MODIS temperature profile
• MODIS moisture profile
• MODIS NDVI
• MODIS Image Product

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Cloud Mask
RGB Image
Land
Cloud
Possible Land
Possible Cloud
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Chinese Mainland Terra-MODIS NDVI First 10 days
of Sep. 2005
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Chinese Mainland Aqua-MODIS NDVI First 10 days of
Sep. 2005
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Vegetation monitor application
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Flood monitor Application
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TERRA/MODIS moisture profile
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TERRA/MODIS temperature profile
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Tibet mosaic image map from MODIS data
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Tibet 3D Perspective image from MODIS
data ---From south to north
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Tibet 3D Perspective image from MODIS
data ---From west to east
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6. Summary

• Multi-data distribution currently broadcast
  MODIS, HRPT and CHRPT. More High level data will
  be broadcast in 2005.
• Flexibleconfigurable bandwidth, multicast.
  Supports more 8192 users.
• Fast distribution capability 6Mb bandwidth.
• Priority Data to be uplinked could be arrange
  priority.
• Large coverage China and surrounding china,
  Totally more 19 Asia countries are under its
  footprint.
• Low cost Client device is very cheap.

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Thanks !
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