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

Geosystems Martin Nix Rapid GIS Spatial Data Quality Introduction GIS Data Quality Integrating Survey and GIS Software Some new trends in field systems Summary

Geosystems Martin Nix 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

Geosystems Martin Nix 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?

Geosystems Martin Nix GIS Data Quality The Cost of Quality Quality  =  A compromise must be found !

Geosystems Martin Nix 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”

Geosystems Martin Nix 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

Geosystems Martin Nix 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

Geosystems Martin Nix 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.

Geosystems Martin Nix Integrating Survey and GIS Software GIS CAD ArcSurvey Computations Real world 4,  ,  ,  ,  ,  ,  0.01 }

Geosystems Martin Nix Integrating Survey and GIS Software The Upgrade process in ArcSurvey 1. Create2. Link

Geosystems Martin Nix Integrating Survey and GIS Software The Upgrade process in ArcSurvey 1. Create2. Link

Geosystems Martin Nix Integrating Survey and GIS Software The Upgrade process in ArcSurvey 1. Create2. Link 3. Select4. Upgrade

Geosystems Martin Nix Integrating Survey and GIS Software The Upgrade process in ArcSurvey 1. Create2. Link 3. Select4. Upgrade

Geosystems Martin Nix 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.

Geosystems Martin Nix Upgrading GIS to centimeter accuracy GS50 with Phase SR520 SR530

Geosystems Martin Nix Navigating to a specific feature...

Geosystems Martin Nix Performing attribute data revision...

Geosystems Martin Nix Laser scans

Geosystems Martin Nix Rapid & Accurate & GIS applications too

Geosystems Martin Nix 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