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STUDY ON ESSENTIAL FACTORS ON GEO-DATA QUALITY

Explore the significance of geo-data quality in modern society and the essential factors affecting it. Topics include what geo-data is, its importance, and factors influencing its quality, with relevant examples and discussions. Discover the key aspects of location data, attribute data, data management, uncertainties, and more. Learn about data handling, sharing, and legal aspects in geospatial information. Discussion on location accuracy, real-time effectiveness, and processing models adds depth to the study.

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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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