providing data cubes with thematic maps laurent pierre & sabine goutier

Providing Data Cubes Providing Data Cubes with Thematic Mapswith Thematic Maps

Laurent Pierre & Sabine Goutier

Open Source Geospatial ’05 Conference 2

PlanPlan• Presentation• Context • Technical Solutions• Application Tour• Deployment• Generalization• Conclusion


• Presentation• Context • Technical Solutions• Application Tour• Deployment• Generalization• Conclusion


PresentationPresentation• Electricité De France ( EDF) is the

historical french electricity company.• 150.000 employees (production,

transport, distribution)• EDF R&D (2000 emp) is a mutualized

entity for all the EDF Group


ContextContext• OLAPs (OnLine Analytical Processing)

for decision tools and activity reports.• From multi-dimensional data they

provide in tables and charts. • ORACLE Express and internet browser

• Howto (simply) get maps from OLAP results ?


ContextContext• An OLAP is composed of axes, levels

and positions, and hierarchies of them.

• Values are associated to crossover of positions and are aggregated according to hierarchies.


ContextContext•Geography

•Time

•Beaune, Burgondy•2004, Oct 04

•Cities, Regions•Years, Months


ContextContext

Regions

Cities

Burgondy

Beaune Volnay

v1=100000 v2=50000

v=v1+v2+ …

wine production at position year=2004 fixed


ContextContext

Represented value

Page positions


ContextContext

géographical axis !géographical axis !


ContextContext• Oracle Express doesn’t provide this

functionality and we can’t access directly its model and data.

• How to associate an OLAP extraction to thematic maps (in case of a ‘level to map’ fit) ?

• We need an intranet solution via a standard navigator


Technical SolutionsTechnical Solutions

• Description of the OLAP model and the data exposed in the table through an XML representation.

• Inspired by xmla from Microsoft & Hyperion


Technical SolutionTechnical Solution

Position id in Map

Level

Axis (geographic)

map


Technical SolutionsTechnical SolutionsOracle

Express

Oracle Express

‘shapefiles’PostgreSQL

ModuleCGI Python

1

ModuleCGI Python

1

Mapserver+

CartoWeb

Mapserver+

CartoWeb

XXX.xml

metaMapBase.xml

metaMapServ.xml

YYY.map

….

CGI Python2

CGI Python2 YYY.map

….

YYY.map

….

YYY.map

….

YYY.map

….Description of geographicalressources

Database for maps and temporay storage

Description of genericcartographic site

Description of businessdata


Technical SolutionsTechnical Solutions• Mapserver • postgreSQL/postGIS• Cartoweb2 (CamptoCamp)

– webGIS on Mapserver– Works with configuration files added to a

mapfile


DeploymentDeployment• Prototype environment :

– Linux– PostgreSQL/ PostGIS

• Industrial environment:– Solaris– Oracle 10


GeneralizationGeneralization• In the wake of Géolap’s development, a

bunch of new cartographic applications has been developed using CartoWeb + Mapserver.

• In order to simplify the development of such application, we decided to use XSLT transformations between XML specialized representations


GeneralizationGeneralization

olapML

Application Level

XSLT

Company Level

Interface Level

EDF rep

CartoWeb

XSLT

xyzML

XSLT

Vendor xyz

XSLT


ConclusionConclusion• This first application with

cartoWeb+Mapserver led to many developments for different domains :– Geomarketing– Industrial ecology– Human ressouces– WMS :

•Raster service•Landsat 7Used for maps and texturing for 3D

applications


ConclusionConclusion• Industrialization of Géolap is bringing a

geomatic ‘culture’ to our IT departement and will ease future deployement of new application over our company.


WMS : usageWMS : usage

providing data cubes with thematic maps laurent pierre & sabine goutier

Documents

technical solutionpositionid

technical solutionsdescription

olap model

contextan olap

olap results

olap extraction

data cubes

multidimensional data