From concept to implementation: web-based cartographic visualisation with CartoService Rita Engemaier, Hartmut Asche - University of Potsdam

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CartoService Web services for quality map generation

Internet


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Summary

1. Motivation
2. Concept: Service-oriented mapping on the web
3. Architecture: Component-based SOA
4. Modelling process: Tasks and workflow
5. Standard application: Map configurator scenario
6. Conclusion


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1 Motivation Ineffective, ubiquitious mapping-1
 Geospatial component in about 95% of digital data (HAMILTON
2010), traditionally visualised in map form
 Semantic and economic importance of geographical data com-
ponents emphasized by Spatial Turn paradigm (>1980s)
 Techniques and media for production of map graphics readily
available to everyone due to ubiquitious access to digital infor-
mation and ICT (>1980s)
 Ongoing explosion of naive, ineffective map products lacking
professional cartographic modelling quality (>1990s)
 Web-based map production system CartoService promotes
generation of quality maps by facilitating automated geovisua-
lisation of geospatial data in cartographic modelling quality


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1 Motivation Ineffective, ubiquitious mapping-2

b a

Cartographic visualisation quality: Population density map
(a) National Atlas USA (2000), (b) National Atlas Germany (1999)

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2 Concept Service-oriented mapping-1
 State-of-the-art software architecture and web technology
utilised to generate quality maps
 Domain-specific cartographic customisation of the standard
visualisation pipeline: classical map design process mapped
onto ICT rule base
 Classical map design and production tasks, i.e. data acquisition,
data processing, object-sign-reference, generalisation, map
composition, map production, map distribution, incorporated in
a set of service components
 CartoService combines sequence of process steps in rule-based
workflow to create meaningful quality maps from web-based
input data and visualisation requirements


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2 Concept Service-oriented mapping-2
Application
GUI

Data CartoService Map

Map
Purpose
Audience Filtering Mapping Rendering

Output

Map design process

Services
Data Projection Harmonisation Generalisation Classification Symbolisation

CartoService: Map modelling pipeline


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3 Architecture Component-based SOA-1
 Implementation of CartoService concept based on service-
oriented architecture (SOA) and object-oriented programming
 CartoService organised as component service composed itself of
separate services, i.e. self-contained information units,
methods and processes, loosely coupled in process chain
 External and internal services managed in repository; request-
driven integration of services allows for extension of process
flow as well as skipping of single process steps
 Three-tier architecture: data layer (including data integration
components), processing layer (including components of non-
graphic, graphic data processing), application layer (user inter-
action, monitoring)


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3 Architecture Component-based SOA-2

Application
Application
Layer

Carto Processing
Data Symboli
Servic analysis -sation
e Layer

DB Data Layer

CartoService architecture: Components and layers


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4 Modelling process Tasks and workflow-1
 CartoService modelling services (layers and components) assig-
ned following tasks in map modelling and visualisation process
 Data integration
Request submission via communication interface > integration
of input data by data connectors and adapters: input dataset
 Data processing (> filtering)
Data assessment, filtering including harmonisation (if required):
filtered, harmonised non-graphic map dataset (primary model)
 Data presentation (> mapping)
Data transformation into presentation graphic by symbolisation
(object-sign-reference): graphically attributed vector represen-
tation of map objects, typical of GIS maps


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 Map creation (> rendering)
Transformation of presentation graphic into quality map model
> cartographic generalisation > map layout > map composition:
effective, fully generalised, symbolised, media-specific map
product (secondary model)
 Combination and interaction of map modelling services arran-
ged in automated processing sequence: component activated
only when preceeding component successfully completed
 Workflow presented considered standard use case (reference
model) of map visualisation and production with CartoService
integrating (guided) user interaction and control


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a b d

Generali- Graphic
Data integration Data processing Symbolisation Map design Map Layout
sation transformation

DB

c
Filtering Mapping Rendering

CartoService process flow: (a) raw data, (b) filtered data, (c) map presen–
tation, (d) quality map model


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5 Standard application Map configurator scenario-1
 Use and interaction potential of CartoService exemplified by
map configurator scenario considered a standard CartoService
application:
 (1) Different geospatial datasets available > geometric, topolo-
gical, semantic data assessment > preselection of appropriate
cartographic visualisation > graphical preview
 (2) Specification of visualisation goals, modification of native
modelling settings (e.g. data selection, level of generalisation)
> access to service features via use-case customised GUI
 (3) Access of external features via GUI > implementation by
AJAX techniques > transparent expansion, reshaping of native
operations


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 (4) GUI settings modifications of visualisation parameters
instantly affect graphic structure of map face
 CartoService not fully implemented yet, thus scenario-based
quality map models generated by manual integration of rele-
vant external services: MapShaper (HARROWER & BLOCH, 2006)
for generalisation operations, ColorBrewer (HARROWER & BRE-
WER, 2003) for definition of colour scales


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Mapping Rendering

CartoService GUI (screenshot): Map modelling and control options


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6 Conclusion Effective quality mapping on the web
Application Interaction

Data CartoService Management Map

Rendering
Symbolisation
Generalisation

Harmonisation CartoService
Data Filter map quality
assessment

OWS: GML FE WPS SE|SLD WMS

CartoService cartographic visualisation quality – compared against OWL-
based map generation


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6 Conclusion Effective quality mapping on the web
 CartoService demonstrates that relevant theoretical/methodi-
cal expertise required for professional map modelling can be
operationalised and made available through web-based services
 CartoService combines server-based functionality and client-
sided interactivity to provide the user with with a web service
facilitating cartographic visualisation in an effective, rule-based
and transparent way
 CartoService-produced quality maps support and promote
effective visual communication, exploration and analysis of
geo-spatial data
 CartoService can thus be seen as an important contribution to
professional map visualisation of quality maps on the internet


From concept to implementation: web-based cartographic visualisation with CartoService Rita Engemaier, Hartmut Asche - University of Potsdam

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From concept to implementation: web-based cartographic visualisation with CartoService Rita Engemaier, Hartmut Asche - University of Potsdam

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