Metadata in EuroGEOSS project(WP5 Experience from Slovenia)

Barbara Medved-Cviklbarbara.medved-cvikl@bf.uni-lj

University of LjubljanaBiotechnical faculty

AgendaMetadata – what is it?About the role of metadata in process of interoperabilityINSPIRE & MetadataOur contribution to EuroGEOSSMetadata toolsSoftware used for WMSExperience from EuroGEOSS projectsExample and problems facing in Slovenia and DMCSEE region

Objective: Represent an EuroGEOSSissues from partner site

WP5WP5--DroughtDroughtDROUGHT SEQUENCE

Meteorological Hydrological

Environmental

Ecosystems Agriculture Habitation

Socio-economic drought

Why metadata are needed?

Without metadata you have to chek all data files for Southeastrn Europe

Data file for SE Europe

Data file for SE Europe

Data file for SE Europe

Data file for SE Europe Data file for SE

Europe

Data file for SE Europe

I want to select areas in SE Europe

where drought is occuring

Very time consuming!

With metadata we can easily browse summary of all data With metadata we can easily browse summary of all data filesfiles Data files for SE Europe

Data files for SE Europe

Data files for SE Europe

Data files for SE Europe

Metadata(summary of

data with standard language)

Data files for SE Europe

Data files for SE Europe

With metadata we can easily browse the summary of all data With metadata we can easily browse the summary of all data filesfiles

Data files for SE Europe

Data files for SE Europe

Data files for SE Europe

Data files for SE Europe

Data files for SE Europe

Data files for SE Europe

MetadataMetadata

Catalog PortalCatalog Portal

Create data and service

Document with Metadata

Publish services

Discover, Evaulate

Transfer

Use

Arhive

1. CreateContent

2. Document3. Catalog4. Publish5. Locate6. Evaluate7. Explore8. Employ9. Arhive

Metadata issues in SloveniaMetadata issues in Slovenia Problems:◦ focus on data◦ focus on services (http://rkg.gov.si/GERK/)◦ “not important”/ too much trouble◦ many informations are colleted on level of ownership

(drought damage data)

• meteorological data and metadata are avaliable on web• (http://gis.arso.gov.si/mpportal/)

Basis to build metadata for Slovenia

InInfrastructure for frastructure for SpSpatial atial IInfonforrmation in themation in theEEuropean Communityuropean Community

INSPIRE directive

EuroGEOSS requirements

Software for producing metadataSoftware for producing metadata

There is a variety of free, commercial and on-line software tools available to support metadata development.

•CatMDEDit /TeIDE consortium (http://catmdedit.sourceforge.net/)•ArcCatalog /ESRI (http://www.esri.com/news/arcuser/0701/metadata.html)•ISO Metadata Editor/INTA (http://www.crepad.rcanaria.es/metadata/en/index_en.htm)

•Inspire metadata editor (http://www.inspire-geoportal.eu/InspireEditor/)

Benefits Weaknesses

CatMDEdit •it includes all the sections of interest for metadata•It is opensource software•accordance with other software

•medium difficulty degree in use•possible unaccordance with other aplication available on Web

Inspire Metadata Editor •easy to use•compilance with INSPIRE directive•it forms metadata on level of data sets, data series and services•created xml files can be integrated in CaMDEdit and other metadata software

•low number of groups for metadata•there are none specialsections for data distribution of the data and of the services•aplication is available on INSPIRE Geoportal

Advantges of CatMDEdit

it is possible to import and export XML files of dieffrent standards (ISO19115, Dublin Core)

“metadata generation tool” ”metadata edtion tool” “metadata validation tool” “metadata management tool”

Edition of KeywordEdition of Keyword

Slovenian contribution to EurogeossSlovenian contribution to Eurogeoss

Slovenia contibuted to cataloge 58 drought related data and 1 metadata on services (DMCSEE WMS Services)

Some problems where identified regarding this activity: Standard to be used: even by using ISO 19115, the

selection of a profile, such as ISO 19115 Core, or the selection of other standard (such as INSPIRE metadata, altought implemented as ISO 19115) is not an easy task

Language to be used: the choice between original language (that for instance, INSPIRE Metadata Implementing Rules [INSPIRE 2009] indicates is the defult if the data set is in theorginal language) or English (that, in the context of the European project, will increse the ease of access and discovery of described resource)

Description of data in tabular format, and included within reports with a bigger scope.

Dealing with property rights: for instance, in the case of delaing with data intended for public service but not publicly avaliable.

Dealing with irregular temporal coverage. Drought data are sometimes only collected when drought is recognized as a national problem.

Source: http://www.arso.gov.si/cd/klima1/Zaslon/PDF%20Zaslon/42-Sedma%20susa%20v%20zadnjih%2041%20letih.pdf

Fundamental problems with metadataFundamental problems with metadata

Tied do datasets Hard-coded (xml files are hard readble for humans) Static sanpshot (problems with up-dating) No way to retrieve supplementary material Process of subtraction Implicit links Metadata quality is mostly limited on syntax. Metadata are created by experts for experts. As with any user group, there are varying levels of expertise

and understanding of the subject.

Weeknesse of Inspire directive Definition of metadata in the INSPIRE

directive is rather thin. (…) metadata means information describing spatial data sets and spatial services and making it possible to discover, inventary and use-

them, (…) Metadata shall include information on

the following: (…) conditions applaying to access to, and use of spatial data sets and services and where applicable, coresponding fee

(…) limitations on public access an the reasons for such limitations, in accordance with Article 13

End-UsersLicense Agreement

Inspire strctures data on the top level with rough catagory similar to the Dewey Decimal Classification.

The Annexes of the EU-Directive define what type of datasets need to be described and the ISO 19139 Standard defines how to describe them.

Problem: Inspire directive is setting the minimum set for descreibnig spatial data. The experience showed that this minimu set is not enough for drought data.

With use of INSPIRE directive is provided a good technical quality of metadata but the semantic and value quality is lower.

What is web mapping?What is web mapping?• Delivery of location based information via the internet

• But it’s more than just a map!• Fundamental to the development of the “Geoweb”

• Characteristics• Leverages Web 2.0 concepts / philosophy – location can

be considered as a key element for making the internet closer to the real world.

• Strong visualisation of information• Large amounts of information stored/delivered• Potentially rich with functionality• Interactive• Distributed & dynamic• Bandwidth intensive

• Examples:• Commercial – Google maps/Earth,• Government – MKGP GERK, Atlas okolja, EDO (European

drought observatory)

Presentation

Database

Web map server

Services

Data store

Browser

Typical web mapping architecture

Files

Web map server

Internet

Typical web mapping technology

Software for WMSSoftware for WMS

• WMS (Web Map Service) is o protocol for requesting rendered map tiles from GIS server

• Allows access to the atribute information via XML• REST-ful protocol- necessary within the URL• configuration of the Web Map

GIS data Mapserver

MapCache

Server Client

Map

http://server.org/wms?request= getmap

location=bbox=

format=png

A map

User

Choosen Server Mapserver is a robust software (lounched in the mid-1990s,

currently version 5.6.0)

Mapserver is a lightweight

Runs in either Apache httpd or IIS (Internet Information Server/Services)

MapServer supports many file formats

Easy to install

More difficult to configurate

• Provide a central repository of drought relavantmetadata that can be accessed by everyone over the Internet.

• A place for data producers to publish their data and data consumers to find the data.

• Using CatMDEdit and INSPIRE metadata editor, publishers can publish XML files to multiple metadata servers.

• New services

• Interoperability

Benefits from EuroGEOSS project

Instead of conclusion