web map server (wms) & web feature server (wfs) overview... · web map server (wms) & web...

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Web Map Server (WMS) & Web Feature Server (WFS)

Overview

Tutorial ‘International Standards’

Vincent Dessard

Belgium

IONIC Software, Founder

[email protected]

ISO/TC 211 17th Plenary & Associated Meetings

Berlin, Germany, DIN Institute / 2003-10-31

Advisory Group on Outreach

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Plan

➢ Web Services

➢ Vision, Dreams & Challenges

➢ How does it works ? (Concepts)

➢ Standards in support of GI Web Services

➢ Applicable ISO/OGC standards

➢ WMS : Web Map Server

➢ WFS : Web Feature Server

➢ SLD, CPS, WMS as a presentation service for GML/Features, …

➢ Web Services & Spatial Data Infrastructure (SDI)

Examples

➢ More advanced vision, concept & products = Future-Proofness !

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Dream & Challenges

• GI community have to face :

– creation of the right services

– quicker response to market demand

– demonstration of differentiated services

– proposition of adhoc and personalized services

– delivery of high level Quality of Services online

This is true for publishers, producers, suppliers, vendors, all levels of authorities, ...

End-users now expect to get that !

Users

Providers

Databases, GIS,...,

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Interoperability - a Must !

• GOAL : enable e-business & Quality of Services

• SOLUTION : interoperable Web Services to

build value & bring innovative services to

user/customer/citizen

INTEROPERABILITY

Innovative Services

Satisfied User Satisfaction

Services, QoS & Time to market

A Must haveDynamic Reach

e-business

Infrastructure / GIS / data / billing

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Online Geo-services

Topo

= Map Server

Clients

BaseMap

= Map Server

Imagery

= Map

Server

Raster

= Map ServerNetwork

= Map Server

Distributed Mapping

or geo-enabled

services to present

and analyze

information from

“Geo-Servers” using

different vendors

technology and

rendering methods

RDBMS / GIS / ‘non-GIS’= Features Servers

➔ Objects ➔ GML/XML ➔ Rendering

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Baseline for GI Interop...

• Map (+ Coverage & Terrain) Services

Web Map Services (WMS, WCS, WTS)

• GI Object Services, Transactions

Web Feature Services

• Models, Encoding & Transport of GI Information

GML

• Presentation, Dynamic Legend, Symbology, …

Portrayal, Styling, …

• Registry & Discovery & Chaining of Data & Services

Catalog Services

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Standards !“Not codifying status-quo of technology anymore,

but defining requirements for new technology…” (Olaf Ostessen, Chairman of TC211)

• Metadata (ISO-ISO19115,19139 / OGC)

• WMS : Web Map Service (OGC / ISO-ISO19128)

• WFS : Web Feature Service (+ filters) (OGC / ISO…starting)

• Feature Model, incl. geometry model (ISO-ISO19109/110,19125 / OGC )

• GML & Encoding (OGC / ISO-ISO19136)

• WCS, WTS : Coverages, Terrain (OGC)

• Catalog / WRS : Catalog & Registry (OGC)

• Service metadata, model, chaining (ISO-ISO19119 / OGC-OWS)

➔ FRAMEWORK FOR INTEROPERABILITY

➔ BOOST THE VALUE CHAIN

➔ ENABLE BETTER ACCESS TO GI

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Plan

➢ Web Services









Examples


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What is a Web Map Server ?

The OpenGIS Web Map Server Specification (WMS) is a set of

interface specifications that provide uniform access by Web

Clients to maps rendered by map servers on the Internet.

Thus, WMS is a service interface specification that:

• Enables the dynamic construction of a map as a picture, as a series of

graphical elements, or as a packaged set of geographic feature data

• Answers basic queries about the content of the map

• Can inform other programs about the maps it can produce and which of

those can be queried further

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What is a Web Map Server ?

MapServer

MapServer

MapServer

MapServer

inte

rnet

http://a-map-co.com/mapserver.cgi?WMTVER=0.9&REQUEST=map&SRS=4326&

BBOX=-88.68815,30.284573,-87.48539,30.989218&

WIDTH=792&HEIGHT=464&LAYERS=STUSA%3ACubeWMT,Landsat%3AMIT-lsat&

STYLES=TRANSPARENT%2FBLACK,Default&FORMAT=PNG&BGCOLOR=0xFFFFFF&

TRANSPARENT=FALSE&EXCEPTIONS=INIMAGE&QUALITY=MEDIUM

MapServer

MapServer

MapServer

MapServer

inte

rnet

http://b-map-

co.com/servlets/mapservlet?VERSION=1.1.0&REQUEST=map&

BBOX=-88.68815,30.284573,-87.48539,30.989218&

WIDTH=792&HEIGHT=464&SRS=4326&

LAYERS=AL+Highway,AL+Highway,AL+Highway&

STYLES=casing,interior,label&FORMAT=GIF&TRANSPARENT=TRUE

MapServer

MapServer

MapServer

MapServer

inte

rnet

http://a-map-

co.com/mapserver.cgi?VERSION=1.1.0&REQUEST=GetMap&

SRS=EPSG:4326&BBOX=-88.68815,30.284573,-87.48539,30.989218&

WIDTH=792&HEIGHT=464&

LAYERS=STUSA%3ACubeWMT,Landsat%3AMIT-lsat&

STYLES=TRANSPARENT%2FBLACK,Default&FORMAT=image/png&

BGCOLOR=0xFFFFFF&TRANSPARENT=FALSE&EXCEPTIONS=application/vnd

.ogc.se_inimage&QUALITY=MEDIUM

http://b-map-co.com/servlets/mapservlet?VERSION=1.1.0&

REQUEST=GetMap&BBOX=-88.68815,30.284573,-87.48539,30.989218&

WIDTH=792&HEIGHT=464&SRS=EPSG:4326&

LAYERS=AL+Highway,AL+Highway,AL+Highway&

STYLES=casing,interior,label&FORMAT=image/gif&TRANSPARENT=TRUE

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Main WMS Interfaces

GetMap - Specifies communication protocols to merge many web

map views into one view.

GetCapabilities - Explains what a map server can do (so

integrators know what to ask for).

GetFeatureInfo - Specifies how to ask for more information

about web map features.

DescribeLayer - Describes the data underlying each layer.

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What is a Web Feature Server ?

Whereas WMS delivers a picture, WFS supports

the direct exploitation and access of feature

data and associated attributes on the Web.

• The WFS is a service interface that describes data

manipulation on geographic features. Data

Manipulation operations include the ability to

insert, delete, update, get and query features on

spatial and non-spatial constraints

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What are Features ?

• A feature is an “entity” (restaurant, tree, etc.), an observation or an “event” (accident, fire)

• A feature is one instance of a FeatureType

• A FeatureType is the Schema (structure) that you expose to the world. A FeatureType is defined by a set of attribute definition, the attribute definition have a name and a type. The attributes may be a number, string and also a geometry

• A Feature Collection is a structured collection of features. It is a Feature that groups other Features

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What is Geographic Markup

Language (GML) ?

• The Geography Markup Language (GML) is an XML encoding for the

transport and storage of geographic information, including both the

spatial and non-spatial properties of geographic features

• GML is a XML extension to define geospatial Features

• GML defines content : There is no mix between content and

presentation • <wfs:SANTACLAUS fid="SANTACLAUS.01">

<wfs:NAME>SantaClaus</wfs:NAME>

<wfs:DESC>This feature represents Santa Claus</wfs:DESC>

<wfs:STATUS>Moving</wfs:STATUS >

<wfs:PLACE>Sydney</wfs:PLACE>

<wfs:GEOM>

<gml:Point srsName="EPSG:4326">

<gml:coordinates>77.612779, -63.09055</gml:coordinates>

</gml:Point>

</wfs:GEOM>

<wfs:SPEED>231309.64</wfs:SPEED>

<wfs:GIFTS>292308</wfs:GIFTS>

• </wfs:SANTACLAUS>

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Main WFS Interfaces• GetCapabilities - Indicates which feature types it can service and what operations

are supported on each.

• DescribeFeatureType - Describes the structure of any feature type upon request.

• GetFeature - Services requests to retrieve feature instances from a datastore.

Feature properties to fetch may be specified. The query may be constrained spatially

and non-spatially.

• LockFeature - Processes a lock request on one or more instances of a feature type

for the duration of a transaction. This ensures that serializable transactions are

supported.

• Transaction - Services transaction requests. A transaction request is composed of

operations that modify features in the datastore; insert, update and

delete features.

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Interoperable Data Models

Design

Portray/Render as map(OGC/ISO WMS/PS)

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Map the WFS/GML feature types

onto the data source (Databases, SDE, …)

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Featuresdo not mix with representation

• Feature definition are made in XMLSchema, based on GML Schemas.

• GML = XML based encoding standard for geographic information developed by

the OpenGIS Consortium.

• GML is intended to model the structure and relationships for real world

geography, not a graphical representation of that geography

• Graphical representation is to be expressed in SVG, VRML, or equivalent.

Features

Theme=“road”

Applying a Style and PortrayStyle of “road”

for Wilkes-Barre Blvd

R

U

L

E

S

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Examples

Credit : IONIC Software (results of Portrayal Engine)

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Style Layer Description

Raster Image / Map

Map Dressing

Portrayed Features

The StyleEditor

Portrayal

Styles

WFS

WMS

Rules

Data

StylesEditor

Styles

Rules

Production Server Administrator Remote Data Administrator

publish

Sync

SLD passed as parameter

of a WMS request to trigger the Style

of the « on-the-fly » presentation

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Plan

➢ Web Services









Examples


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SDI : Architecture

Application

Registry services

CatalogFind Service

Other SDI,

Map Servers, Feature

Servers, Coverage

Servers, Census info,

Weather, etc.

publis

h

bin

d

Data

Map Server

MD

Data

Feature Server

MD

Data

Map Server

Feature Server

Portrayal

MD

Data

Services

(existing)

geo

databases

Other Services

Gazetteer

Annotation (xima)

Geo Coding

...

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EC / INSPIRE

Architectural Vision

• The architecture envisioned by INSPIRE deploys interoperable services that will help to produce and publish, find and access, and eventually, use and understand geographic information over the Internet across European Union and Association Countries at local, national, and European levels

2002 ARCHITECTURE AND STANDARDS WORKING GROUP - INSPIRE Architecture and Standards Position Paper, JRC-Institute for Environment and Sustainability, Ispra (64p)

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Plan

➢ Web Services









Examples


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NMA - Norvegian Mapping Agency

e-gov – National SDI

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Interoperable

Spatial Data

Infrastructure &

Application for

General Secretariat /

Cartography Dept

at UN HQ

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EO – Earth Observation / CEOS (including GML Data exchange)

Web Mapping

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WFS/GML for e-business

(a PathFinder Project)

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Web Application Design

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Using online Catalog

Portal of

OGC Web

Services

by

BRGM (French

Geological

Survey)

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A WFS/GML LBS project !

UMTS 3G

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3G Mobile LBS

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Disaster Response Interop Geo-Services (OWS1.2 2002)

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Layer

Management

Gazetteer

Service

Navigation

functionality

Servers

e-Gov Application

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Plan

➢ Web Services









Examples


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Data Clearinghouse

Publish

MetadataFind

Data

Browse Result

ClearingHouse Network

Load

Data : Publish-Find-Load

NO BIND

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The Service vision

“ Publish-Find-Bind”on the web

• Promoting interoperability by minimizing

the requirements for shared understanding

• Enabling just-in-time integration

• Enabling interoperability of legacy

applications

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Services RegistryRegister both

data and services metadata

Registry interface

Registry

Service

metadata

Data

metadata

Service interface

Request Response

Data

Service

metadata

Data

metadata

1 2 3Data

Services

Metadata Registry

« Catalogs »

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Data Services CatalogMetadata

The Big Picture

GI access

Web ServicesService

Capabilities

Metadata

service

Data

Catalog DB

(Services

registry)

Catalog Services

(data)

metadata

1 2 3Data Services Metadata Registry

clientsclientsclients

catalog

client tools

metadata

client tools

service

client tools

WMS/WFS/WCS/WTS WRS

AP

I (A

pli

cati

on

s)

Cli

ents

En

gin

es +

Serv

ices

«Profiles»

WebServices

CatalogsServices

(www.askthespider.com)

Application Dev Toolkits

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18, Rue de Wallonie

4460 Grâce-Hollogne (Liège)

BELGIUM

Tél : +32/4/364.0.364

Fax : +32/4/253.47.37

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