Technologies and Standards on Spatial Data Sharing in China

1
Technologies and Standards on Spatial Data
Sharing in China

•   Jianya Gong
• Wuhan University, CHINA

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Contents

• 1. Introduction in Geo-Information Communities
  in China
• 2. The Researches for Geo-spatial Data Sharing
  Technologies and Standards
• 3. Implementation and Test of Geographic
  Information Sharing Standards
• 4. Conclusions

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1. Introduction of Geo-Information Communities
in China
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Status of Geospatial Information Technology in
China

• Chinese government encourages development on
  Geospatial Information Technology
• The technologies of Geospatial Information in
  China have developed quickly in recent years,
  especially on
• Remote Sensors
• Satellite Navigation System
• Digital Photogrammetry and Remote Sensing Image
  Processing System
• GIS Software System
• Remote Sensing and GIS Application

5
Photogrammetry, Remote Sensing and GIS System in
China

• Digital Photogrammetry System
• Remote Sensing Processing System
• GIS Software System

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Two commercial digital photogrammetry systems

• VirtuoZo
• is developed by Wuhan University and Super
  Company
• Jx-4
• is developed by Chinese Academy in Surveying
  and Mapping, and Beijing Siwei Company

They occupy 80-90 markets in China
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Four remote sensing processing systems

• GeoImager
• is developed by Wuhan University and Wuda
  Geo Company
• RSImages
• is developed by Chinese Academy in Surveying
  and Mapping,
• Taitan Image System
• is developed by Beijing Taitan Company
• RS System
• is developed by Institute of Remote Sensing
  Application of Chinese Academy

They occupy 20-30 markets in China
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Three commercial GIS software systems in China

• GeoStar
• is developed by Wuhan University and Wuda Geo
  Company
• MapGIS
• is developed by Chinese Geology University and
  Zhongdi Company
• SuperMap
• is developed by Institute in Resource and
  Geography of Chinese
• Academy and SuperMap Company

They occupy about 50 markets in China
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• 2. Research on Geo-spatial Data Sharing
  Technologies and Standards

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Research Funding

• From National High Technology Program (863
  program) a specific research field Earth
  Observation and Navigation. The technologies and
  standards on spatial data sharing have been as a
  key project
• From State Bureau of Surveying and Mapping
• From other agencies Local government,
  Geo-related companies

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Research Projects and Plans

• 863 key project Standards of Geo-Spatial Data
  Sharing and Technologies of Geo-Information Web
  Service (2002-2005).
• Ongoing national standards GML, WFS, WMS, Data
  Transfer Standard, Spatial Scheme, GI
  Registration, Catalogue service, etc.
• 863 key project Technologies of GRID-GIS
  (2007-2010). The interoperability technologies
  standards will be one of the important contents.
• More standards will be upcoming in the near
  future.

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Three levels of spatial data sharing standards
in China
Geospatial Data Interoperability Standards
Geospatial Data Distribution Standards
Basic Standards
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Level 1 Basic Standards

• Metadata Standard adoption of ISO 19115 and
  released in last few years
• Geospatial Feature Classification proposed by
  Chinas institutes, released in 1992 and updated
  in 2005
• Geospatial Data Transfer Standard proposed by
  Wuhan University, released in 1999 and updated in
  2006
• Geospatial Data Model adoption of ISO 19107 and
  to be released in 2008
• Geospatial Visualization and Symbolization
  Standard proposed by Wuhan University and to be
  released in 2008
• Geography Markup Language (GML) adoption of ISO
  19136 and to be released in 2008

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Geo-spatial Data Transfer Standard

• Contents
• (1) Basic information of data set
• (2) Definition of feature types
• (3)Data structure of attribute data
• (4) Geometric data
• (5)Annotation data
• (6)Topology data
• (7)Attribute data
• (8)Visualization data

• adopting geo-spatial data model
• using both BNF and XML encoding

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Geospatial Data Model
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HeadBeginltCRgt DataMark CNSDTF-VCTltCRgt Version
ltGB/T17798-2007gtltCRgt CoordinateSystemType
CDPltCRgt Dim lt23gtltCRgt XAxisDirection
ltENWSgtltCRgt YAxisDirection
ltNESWgtltCRgt XYUnit MDlt????gtltCRgt ZUnit
Mlt????gtltCRgt Spheroid lt????gtltCRgt PrimeMeridia
n lt????gtltCRgt Projection lt????gtltCRgt Parameter
s lt????gtltCRgt VerticalDatum lt????gtltCRgt Tempor
alReferenceSystem lt?????gtltCRgt ExtentMinlt??gtltCR
gt ExtentMaxlt??gtltCRgt MapScale
lt??gtltCRgt Offset lt??gtltCRgt Date
lt??gtltCRgt Separator lt??gtltCRgt HeadEndltCRgt
Basic information of data set (using BNF)
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??????????? lt??????gt FeatureCodeBeginltCRgt lt??
????gt,lt??????gt,lt????gt,lt????gt,lt???gtltCRgt FeatureC
odeEndltCRgt lt??????gt lt???gt lt???gt???????(,)? lt??
??gt Point Line Polygon Solid
Collection Annotation lt????gt
lt???gt ??????????? lt???gt lt???gt lt???gt???????(,)?
Definition of feature types (using BNF)
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lt?xml version"1.0" encoding"UTF-8"?gt ltschema
targetNamespace"http//www.csdf.org/Schema"
xmlnscsdf"http//www.csdf.org/Schema"
xmlns "http//www.w3.org/2001/XMLSchema"
elementFormDefault"qualified" attributeFormDefaul
t"unqualified"gt ltcomplexType name"datasetType"gt
ltannotationgt ltdocumentationgt????????????????
???lt/documentationgt lt/annotationgt ltchoicegt
ltelement ref"csdfvectorData"/gt ltelement
ref"csdfimageData"/gt ltelement
ref"csdfgridData"/gt lt/choicegt lt/complexTypegt
ltelement name"dataset" type"csdfdatasetType"gt
ltannotationgt ltdocumentationgt?????????????????
?lt/documentationgt lt/annotationgt lt/elementgt ltco
mplexType name"vectorDataType"gt ltannotationgt
ltdocumentationgt??????lt/documentationgt lt/annotat
iongt ltsequencegt ltelement ref"csdfvectorMeta
Data"/gt ltelement ref"csdffeatureCodes"/gt lt
element ref"csdftableStructures"/gt ltelement
ref"csdfpointFeatures" minOccurs"0"/gt lteleme
nt ref"csdfcurveFeatures" minOccurs"0"/gt ltel
ement ref"csdfpolygonFeatures"
minOccurs"0"/gt ltelement ref"csdfsolidFeature
s" minOccurs"0"/gt ltelement ref"csdfmultiGeom
etryFeatures" minOccurs"0"/gt ltelement
ref"csdfannotationFeatures" minOccurs"0"/gt lt
element ref"csdftopoNodes" minOccurs"0"/gt lte
lement ref"csdftopoEdges" minOccurs"0"/gt ltel
ement ref"csdfattributeTables"
minOccurs"0"/gt ltelement ref"csdfvarchars"
minOccurs"0"/gt ltelement ref"csdfstyles"
minOccurs"0"/gt lt/sequencegt lt/complexTypegt ltel
ement name"vectorData" type"csdfvectorDataType"
gt ltannotationgt ltdocumentationgt????lt/documenta
tiongt lt/annotationgt lt/elementgt ltcomplexType
name"vectorMetaDataType"gt ltannotationgt ltdocu
mentationgt?????????lt/documentationgt lt/annotation
gt ltsequencegt ltelement name"version"
type"string" fixed"GB/T17798-2007"gt
Basic information for data set (using XML)
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ltsimpleType name"geometryTypeType"gt ltannotation
gt ltdocumentationgt????lt/documentationgt lt/annot
ationgt ltrestriction base"string"gt ltenumerati
on value"Point"/gt ltenumeration
value"Line"/gt ltenumeration value"Polygon"/gt
ltenumeration value"Annotation"/gt ltenumeratio
n value"Solid"/gt lt/restrictiongt lt/simpleTypegt
ltcomplexType name"featureCodeType"gt ltannotatio
ngt ltdocumentationgt????????lt/documentationgt lt/
annotationgt ltsequencegt ltelement name"code"
type"string"gt ltannotationgt ltdocumentatio
ngt??????lt/documentationgt lt/annotationgt lt/el
ementgt ltelement name"name" type"string"gt
ltannotationgt ltdocumentationgt??????lt/documenta
tiongt lt/annotationgt lt/elementgt ltelement
name"geometryType" type"csdfgeometryTypeType"gt
ltannotationgt ltdocumentationgt????lt/documen
tationgt lt/annotationgt lt/elementgt
Definition of feature types (using XML)
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Level 2Geospatial Data Distribution Standards

• Specification of geospatial dataset registration
• Specification of geospatial data catalogue
• Guide of geospatial data distribution

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Specification of geospatial dataset registration

• was proposed by National Information Center
  with reference to ISO 19135 Procedures for
  registration of geographic information items and
  W3C UDDI/WSDL, and will be released in 2008.

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Example Registration service system for
geo-spatial dataset
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Specification of geospatial data catalogue

• With reference to OGC catalogue service
  specification, and to be released in 2008.

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Example Catalogue Service for Geospatial Data
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Results of the catalogue service example
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Guide of Geospatial Data Distribution

• was proposed by Chinese Geomatric Center, and
  applied in geospatial data distribution.

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Example Distribution service system for
geospatial data
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Level 3 Geospatial Data Interoperability
Standards

• Simple Feature Implementation Specification
• for OLE/COM
• for JAVA
• Web Map Service (WMS), Web Feature Service (WFS),
  Web Coverage Service (WCS)
• adoption of the corresponding ISO or OGC
  standards and to be released in 2008

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Simple Feature Implementation Specification for
OLE/COM

• Simple feature implementation specification for
  OLE/COM from OGC, has been implemented and tested
  by Chinese GIS software.

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(No Transcript)
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Objects
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Common Methods

• IGeometry
• IGeometryget_Dimension
• IGeometryget_SpatialReference
• IGeometryput_SpatialReference
  
• IGeometryIsEmpty
  
• IGeometrySetEmpty
  
• IGeometryIsSimple
  
• IGeometryget_Envelope
  
• IGeometryClone
  
  
• IGeometryProject

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Common Methods

• interface IGeometry IUnknown
• interface IPoint IGeometry
• interface ILineString IGeometry
• interface IPolygon IGeometry
• interface IGeoAnnotation IGeometry
• interface IGeometryCollection IGeometry
• interface IMultiPoint IGeometryCollection
• interface IMultiLineString IGeometryCollection
• interface IMultiPolygon IGeometryCollection

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Example of geographical information sharing
between different data sources (Implemented in
Geostar)
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Simple Feature Implementation Specification for
JAVA

• Simple feature implementation specification for
  JAVA has been proposed with referencing to Simple
  feature implementation specification for CORBAR,
  has been implemented and tested.

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3. Implementation and Test of Geographic
Information Sharing Standards
Several GIS software systems in China have
implemented the standards on geospatial data
sharing, such as CNSDTF, simple feature
implementation specification for COM, for JAVA,
and WMS, WFS, WCS and so on.
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Test of Web Map Service
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Test of Web Coverage Service
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Test of Web Feature Service
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Geo-spatial data integration by multiple GISs
based on geo-spatial information web service
specifications
GeoStar
SuperMap
MapGIS
Spatial Data Integration
ArcIMS
MapInfo
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Example spatial data integration by multiple web
service specifications
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Data Integration from Multi Systems and Based on
Multi Specifications
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Conclusions

• China has been doing research, implementation
  and testing on geo-spatial data sharing standards
• Metadata standard, geospatial feature
  classification and geospatial data transfer
  standard have been released and applied in China.
• Geospatial registration service, catalogue
  service, GML, WMS, WFS, WCS will be released in
  the near future.
• The research and application of geo-spatial data
  sharing standards in China are still in the
  primary stage, and we hope to have more
  cooperation with the colleagues in the world.

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• Thank You!