Martin Nix and Dr Craig D. Hill

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

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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?

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GIS Data Quality

• The Cost of Quality
• Quality ? ?
• A compromise must be found !

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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

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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

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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

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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.

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Integrating Survey and GIS Software

• GIS
• CAD ArcSurvey
• Computations
• Real world

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Integrating Survey and GIS Software

• The Upgrade process in ArcSurvey
• 1. Create 2. Link

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Integrating Survey and GIS Software

• The Upgrade process in ArcSurvey
• 1. Create 2. Link

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Integrating Survey and GIS Software

• The Upgrade process in ArcSurvey
• 1. Create 2. Link
• 3. Select 4. Upgrade

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Integrating Survey and GIS Software

• The Upgrade process in ArcSurvey
• 1. Create 2. Link
• 3. Select 4. Upgrade

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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.

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Upgrading GIS to centimeter accuracy
SR530
SR520
GS50 with Phase
GS50
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Navigating to a specific feature...
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Performing attribute data revision...
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Laser scans
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Rapid Accurate GIS applications too
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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