Dia 1

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A framework for automated application-driven
generalization of base maps Eddie
Poppe November 1, 2006
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Content

• Recapitulation
• A methodological framework
• Stage 1 of the framework
• Stage 2 of the framework
• Involvement of consortium partners

done
next
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Topographic maps and base maps

• topographic map a graphic representation
  delineating natural and man-made features of an
  area or region in a way that shows their relative
  positions and elevations.
• base map a map layer below a thematic map
  providing a topographic frame of reference
  (framework information).

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Topographic maps and base maps

• Topographic maps are general reference maps
• Thematic maps are used for specific applications.
• Topographic maps can be used as base maps

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Problem

• but topographic maps are principally not
  designed to be used as base maps for specific
  applications!

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Solution generalization

• generalization the process of reducing
  complexity in a data set or map at reduced scale
  by extracting or emphasizing the essential and
  meaningful information, and simultaneously
  removing or suppressing the inessential and
  meaningless information.
• (objective-oriented definition based on Weibel
  Dutton, 2005)
• in order to enhance the usability of the data
  set or map for a specific application!

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• How to design the application-driven
  generalization process to acquire essential and
  meaningful generalization results?
• application a specific use to which information
  is put by a specific user.

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Research question and objective

• Research question In which way can users
  (topographic) information needs drive the
  automated generalization of topographic
  information in order to acquire base maps?
• Research objective to develop a methodology for
  automated generalization in order to acquire base
  maps for specific applications from one single
  detailed topographic data set.

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Requirements for the methodology

• A specification of the users (topographic)
  information needs (related to content and
  representation).
• Detailed topographic data set (Basisregistratie
  Topografie).
• ? Single storage, multiple use.
• Application-driven generalization technology.
• ? Flexible!

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• How to combine these requirements?
• A methodological framework based on user-centred
  design!
• see handout user centred design process for
  automated application-driven generalization of
  topographic information (provisional version!)

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1. Plan the user-centred generalization process

• Preparatory stage.
• Considerations
• How should the user be involved?
• How should the user and the use be represented?
• Which research techniques should be applied?

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2. Specify the context of use

• This stage consists of three substages
• Specify the application domain. What is the
  application domain and what are its
  characteristics?
• Specify the user. Who are the users and what are
  their characteristics?
• Specify the use. Which topographic information do
  the users need and how should this information be
  represented on the base map?

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3. Formalize the users requirements

• Formalize generalization rules and constraints.
• Link with Theodors
• part of the project!

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4. Produce generalization solutions

• Processing stage.
• Link with Theodors part of the project!
• The rules and constraints will drive the
  generalization process.
• The result will be a base map that should satisfy
  the users (topographic) information needs.

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5. Evaluate generalization solutions

• User tests should prove whether or not
• The resulting base map satisfies the users
  (topographic) information needs.
• The users are able to achieve their goals.
• The resulting base map provides significantly
  better results in satisfying the users
  requirements than the base maps that are
  currently used.

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6. Final solution or re-specify

• If the results are negative
• ? re-specify the context of use (2 iterations)
• If the results are positive
• the base map satisfies specified requirements.
• The requirements should be well-defined!

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Done and to do next
website http//kartoweb.itc.nl/durpondergronden
(in preparation)
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Done stage 1

• Plan the user-centred generalization process
• Groups of users in a real context of use
• based on user roles (shared goals, tasks and
  information needs)
• see handout goals and information needs of
  various user groups of physical plans
• Research techniques
• Questionnaires and interviews

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To do next stage 2!

• Specification of the context of use by performing
  the questionnaires and the interviews
• see handout questionnaire and interview schema

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Question

• Do you have any comments on the proposed
  methodological framework?

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Requests (1)

• To share knowledge about your colleagues1 or
  customers2 (topographic) information needs at
  multiple scale levels.
• 1 request for VROM, Overijssel and Zuid-Holland
• 2 request for the LSV GBKN, Kadaster, TD
  Kadaster
• and for ESRI, NedGraphics and Bentley

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Requests (2)

• To share the contacts you have with your
  colleagues1 or customers2 .
• 1 request for VROM, Overijssel and Zuid-Holland
• 2 request for the LSV GBKN, Kadaster, TD
  Kadaster
• and for ESRI, NedGraphics and Bentley

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Requests (3)

• To use the expertise you have in formulating and
  performing questionnaires and interviews.
• (request for all consortium partners)

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Requests (4)

• Do you have any comments on the questionnaire and
  the interview?
• (request for all consortium partners)

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Requests (5)

• Provision of maps for the interviews.
• (request for the LSV GBKN, Kadaster and TD
  Kadaster)

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• Thanks for your attention!
• Are there any questions?
• Eddie Poppe
• telephone [phone]
• mail poppe_at_itc.nl

on a productive cooperation!