March 16, 2005 SDI Concepcion Technology for Spatial Data Infrastructures Werner Kuhn Slides by Michael Gould

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March 16, 2005 SDI Concepcion

Technology forSpatial Data Infrastructures

Werner Kuhn

Slides by Michael Gould

Werner Kuhn SDI Technology 2

The 3 functions of GIS

Spatial dataInput/editing

Query + Analysis

Presentation End user

productivity


Novel paradigm: web mapping

Spatial dataCreation

Query +analysis

Presentation

Light client (browser)

User

Central server

DB

- new economic model: centralization AND decentralization


www.mapa.es




Status quo

Many web map servers (WMS) available to public

Creation of islands of information access Each map server in a separate browser

window...often impossible to combine layers


Data Data Data

ServerServer Server

Web Client

standards, Interfaces

WebMapping Testbed (WMT)

Proof-of-concept project, October 1999, connecting heterogeneous servers and clients (multi-vendor)A test of collaboration among various companies and agenciesRetrieve data in data servers in various nations, from various clients


OGC Web Mapping Testbed (WMT)

Census DataVendor C

Weather DataVendor A

EvacuationData

Vendor D

FoundationData

Vendor B

Flood ZonesData

Vendor E

ImageryData

Vendor F

WMT will distributeWMT will distributedata sets acrossdata sets across

multiple map serversmultiple map serversusing differentusing different

vendor solutionsvendor solutions

Scenario: Catastrophic weather eventScenario: Catastrophic weather event


TerraServer - http://terraserver.microsoft.com

before WMT

MapQuest - http://www.mapquest.comEPA - http://www.epa.gov/enviro/enviromapper.html


Server 1

Server 2

Server 3

Interoperable Web Mapping

Data HoldingsCoverage areasMap ProjectionFormatsCost/Policies



CatalogService

Source: Digital Earth, NASA


Viewer Client: Combined Map

Topography?Water?

Boundaries?

CatalogService

Interoperable Web Mapping

Server 1

Server 2

Server 3

Server 1: Topography

Server 2: Water

Server 3: Boundaries

Source: Digital Earth, NASA


Metadata

Internal descriptive information that makes the geodata useful

Convergence on ISO model Proposal of Consejo Geográfico Nacional

• National profile (IDE-E) of ISO19115 + elements from wider model (Dublin Core)

Software to create/edit metadata is already available, free software




WMS

Coverage serverWCS

Feature serverWFS

Terrainserver


Metadata describing servicesMetadata for an online service, and a URLMetadata for an online service, and a URLMetadata for an online service, and a URLMetadata for an online service, and a URLMetadata for an online service, and a URLMetadata for an online service, and a URLMetadata for an online service, and a URLMetadata for an online service, and a URLMetadata for an online service, and a URLMetadata for an online service, and a URLMetadata for an online service, and a URLMetadata for an online service, and a URL …..

Find me a processing function(buffer for my highway)

URL

Catalog services Application servers with Metadata and OpenGIS interfaces


SDI technology: complicated


SDI technology: simplified

Source: NASA, 2001


Novelty of WMT

Define interfaces: standard-based software “plugs”• To connect to servers: WMS, WFS, WCS....• From diverse client software

Server continues to be optimized for “its users”, but ALSO may cooperate as a node in a heterogeneous network of servers

GIS for me GIS for me, AND also partially accessible to others, if they are interested


Conclusions

The technology for sharing geoinformation exists, and has been demonstrated• Based on international standards• Available to the public• Independent of commercial brand names

Now, we need to apply the technology...

Documents

March 16, 2005 SDI Concepcion Technology for Spatial Data Infrastructures Werner Kuhn Slides by Michael Gould