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Martin Nix and Dr Craig D. Hill Leica Geosystems AG Heerbrugg Switzerland

Rapid Accurate GIS updates with improved links to survey systems. Martin Nix and Dr Craig D. Hill Leica Geosystems AG Heerbrugg Switzerland. Rapid GIS Spatial Data Quality. Introduction GIS Data Quality Integrating Survey and GIS Software Some new trends in field systems Summary.

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Martin Nix and Dr Craig D. Hill Leica Geosystems AG Heerbrugg Switzerland

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  1. Rapid Accurate GIS updates with improved links to survey systems Martin Nix and Dr Craig D. Hill Leica Geosystems AG Heerbrugg Switzerland

  2. Rapid GIS Spatial Data Quality Introduction GIS Data Quality Integrating Survey and GIS Software Some new trends in field systems Summary

  3. GIS Data Quality Spatial Data: location of features • Quality: difference between the true location and data set location of the feature • Sources: Digitising, scanning, photogrammetry, RS, GPS, terrestrial surveying, etc. with differing quality

  4. GIS Data Quality Non-spatial Data: description of features • Quality: how well attributes describe the features being represented • Consistency and Integrity: Are naming conventions consistent? Do features of the same type have the same descriptive data and level of detail?

  5. GIS Data Quality The Cost of Quality Quality  =  A compromise must be found !

  6. Maintaining GIS Spatial Data The Update process • Ensure that all geospatial objects that appear, or disappear, in the real world are amended in the GIS data set in a timely manner “data analysis is only as good as the underlying data”

  7. Maintaining GIS Spatial Data The Upgrade process • Improve the accuracy of the existing geospatial objects • Surveyors?: Having a comprehensive understanding in measurement technologies and methods, an in-depth knowledge of data analysis, co-ordinate systems and the presentation of spatial data, surveyors are ideally suited to play a pivotal role in the maintenance of accurate GIS spatial data

  8. Integrating Survey and GIS Software • Traditionally separate software packages were used to process and manage survey data and conduct GIS analysis • Combined development effort by Leica Geosystems and ESRI to create an extension to ArcInfo: ArcSurvey

  9. Integrating Survey and GIS Software ArcSurvey functionality: • An interface between survey data formats and the GIS database; • Data storage models and processing methods for survey measurements; • Survey measurement visualisation; • Advanced survey measurement editing and management; • Storage of survey computations within the database; and • The ability to associate the original data (e.g. survey measurements) with features in the GIS.

  10. 4,145.98  0.02 1,350.12  0.01 4,145.34  0.01 1,340.65  0.01 4,123.87  0.02 1,654.34  0.01 Integrating Survey and GIS Software GIS CAD ArcSurvey Computations Real world }

  11. Integrating Survey and GIS Software • The Upgrade process in ArcSurvey 1. Create 2. Link

  12. Integrating Survey and GIS Software • The Upgrade process in ArcSurvey 1. Create 2. Link

  13. Integrating Survey and GIS Software • The Upgrade process in ArcSurvey 1. Create 2. Link 3. Select 4. Upgrade

  14. Integrating Survey and GIS Software • The Upgrade process in ArcSurvey 1. Create 2. Link 3. Select 4. Upgrade

  15. Integrating Survey and GIS Software • At any time new survey measurements can be added and features can be upgraded • Quality reports can be created that include: • Source and quality of all measurements associated with features; • The computations performed on the measurements to create the survey point; and • Full statistical information describing the quality and hence the quality of the feature vertex associated through the link.

  16. Upgrading GIS to centimeter accuracy SR530 SR520 GS50 with Phase GS50

  17. Navigating to a specific feature...

  18. Performing attribute data revision...

  19. Laser scans

  20. Rapid & Accurate & GIS applications too

  21. Summary • A GIS database of sufficient quality and of adequate currency is crucial to ensure that analysis and subsequent decision making is appropriate • ArcSurvey presents a new technology to integrate surveying and GIS • ArcSurvey allows measurements and computations to be stored in the GIS database, hence, improving traceability and maintainance. • New innovations in field systems improve spatial accuracy and lower acquisition costs

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