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STUDY ON ESSENTIAL FACTORS ON GEO-DATA QUALITY

STUDY ON ESSENTIAL FACTORS ON GEO-DATA QUALITY. YANG Tieli College of geo-exporation science and technology,jinlin university,changchun,130026,P.R.C. TOPICS. What is Geo-data? How about the importance about the quality of Geo-data? Essential factors about Geo-data quality?

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STUDY ON ESSENTIAL FACTORS ON GEO-DATA QUALITY

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  1. STUDY ON ESSENTIAL FACTORS ON GEO-DATA QUALITY YANG Tieli College of geo-exporation science and technology,jinlin university,changchun,130026,P.R.C

  2. TOPICS • What is Geo-data? • How about the importance about the quality of Geo-data? • Essential factors about Geo-data quality? • Discussions and Conclusions

  3. What is Geo-data? • Geo-data is a kind of science data which associated with geographical position on the globe or others. • Synonyms: spatial data, space data • Connected science: geography, surveying and mapping,GPS,GIS,RS, geomatics,et al.

  4. Some examples • Something in a certain place • Where is/are something in? • What property/attribute are the certain things?

  5. How about the importance about the quality of Geo-data? • Geographic information plays an increasingly important role in our modern society. In many situations reliable and up-to-date spatial information is crucial, e.g. in disaster response systems. In other cases geographic information is an important input for decision-making processes of governments (urban planning, nature conservation), businesses (market exploration, location analysis) or individuals (tourist information, real estate prices). • So geo_data must present a true situation about a spatial object’s attributes. Its quality can be expressed as follows,

  6. How about the importance about the quality of Geo-data?(continued) • location data • attribute data • data management • data reproducing • uncertainties • effectiveness for real time • data output • sharing exchange • legal dispute

  7. Essential factors about Geo-data quality? 1.location data • A group of data,such as (longitude,latitude,elevation) and (x,y,z) and so on! • Relationship between/among Spatial objects,such as joint, orientation et al. • directions,such as azimuth,lower/higher

  8. 2.attribute data • Owner of a certain area or cadastral unit • Area and perimeter of a certain spatial object • Color, vegetation type

  9. 3.data management • Structure of spatial database • Data input,edit and so so • Queries according to objects/attributes

  10. 4.data reproducing • Density of population/pollutions • Add up/average of some attributes of a certain spatial object • the processing model

  11. 5.uncertainties • Fuzzy boundary • gradual changing boundary • Determinant attribute according to different criteria,such as amount,area or others • Round numbers

  12. 6.effectiveness for real time • A spatial object has spatial-temporal attribute,so the existence of a certain object must be existed in a certain place (spatial attribute) and during a period of certain time (temporal attribute)

  13. 7.data output • Figure • Table • 2D or 3D • Visualization

  14. 8.sharing exchange • Share • Exchange • Check

  15. 9.legal dispute • Loss/lack aroused by using spatial data • Legal and illegal

  16. Discussions and Conclusions • the location accuracy • the effectiveness for real time • the processing model Are taking as the primary factors for appraisal geography data reliability.

  17. many thanks!

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