prise en main de geonetwork: gestion et publication de métadonnées & harvesting et échange de...

Prise en main de GeoNetwork: gestion et publication de

métadonnées &

harvesting et échange de métadonnées

Andrea de Bono

Certificat Géomatique - 16.02.2012

Introduction to GeoNetwork OpenSource

1 Explore software and data using FAO GeoNetwork

Search, View, Download (data and services)

2 Create your Spatial Information Management System (SIMS)

2.1 Customize your GeoNetwork : Login, explore admin part, categories, groups, user…

2.2 populate your GeoNetwork

2.2.1) Insert existing metadata: Single file, batch import (sample files, ) Publish (roles, permissions)

2.2.3) Create your metadata: Add template, Create a template, ISO elements, fill fields, Publish

2.2.3) Add data from a remote node: Harvest data by using CSW, WMS, GeoNetwork node

2.3 Useful tips

2Certificat Géomatique - 16.02.2012

Contents

Much more than a simple metadata catalog…..



GeoNetwork opensource is a standard based and decentralized spatial information management system,

designed to enable access to geo-referenced databases and cartographic products from a variety of data providers through descriptive metadata,

enhancing the spatial information exchange and sharing between organisations and their audience, using the capacities and the power of the Internet.



Main Features

1) Instant search on local and distributed geospatial catalogues

2) Uploading and downloading of data, documents, PDF’s and any other content

3) An interactive Web map viewer that combines Web Map Services from distributed servers around the world

4) Online map layout generation and export in PDF format

5) Online editing of metadata with a powerful template system

6) Scheduled harvesting and synchronization of metadata between distributed catalogues

7) Groups and users management

8) Fine grained access control




1) Explore software and data using FAO Geonetwork

• 1) Instant search on local and distributed geospatial catalogues



• 2) Uploading and downloading of data, documents, PDF’s and any other content

Download dataExport metadata

Create documents

3) An interactive Web map viewer that combines Web Map Services from distributed servers around the world

4) Online map layout generation and export in PDF format



Main Features

5) Online editing of metadata with a powerful template system

6) Scheduled harvesting and synchronization of metadata between distributed catalogues

7) Groups and users management

8) Fine grained access control

http://127.0.0.1:8080/geonetwork/srv/en/main.home


1) Explore software and data using FAO GeoNetwork


2 Create your SIMS: - 2.1 Customize your GeoNetwork

1

2

Load a template (Administration tab)


Login (admin admin)


Create group (Administration tab)


Group name: Geom2012


Create user (Administration tab)


User name: vistor PWD: visitor


1. Administrator Profile: All

2. User Administrator Profile: All excepted system administration and configuration tasks

3. Content Reviewer Profile: Rights on reviewing metadata content within the own group and authorizing its publication

4. Editor Profile:Full rights on creating/editing/ deleting new/old data within the own group

5. Registered User Profile Right to download protected data

Check your right an log you again as admin

Change categories (Administration tab)


1) Delete existing categories

2) Add new categoriesCategories to add (from INSPIRE)

Administrative_units

Protected_sites

Elevation

Natural_risk_zones

Land_cover

Interactive_resources (used for store services)


Create alias “Localization” (Administration tab)


Eliminate “_”

NB save after each operation !!


Exercise 1): Insert existing metadata

•From … download the metadata_xls.zip and unzip on your local disk

•From the FAO GeoNetwork Download metadata for forest geospatial dataset (Global extent) and save the xml file in the metadata_xls folder

•Upload on (your) GeoNetwork: (see below)


Copy/paste your path

2 Create your SIMS: - 2.2 populate your GeoNetwork

Exercise 1): Insert existing metadata

•Move to appropriate category (one by one…)


•Publish metadata (one by one)


•Logout and explore the results



Create your metadata following the ISO 19115 standard…..



.



Note that TC211/ISO:19115:2003 is not itself a format, but a standard for defining formats and profiles.

To comply with the ISO:19115:2003 metadata standard a data format (or profile) must define a core set of metadata elements as shown below.

This list contains metadata elements answering the following questions:

1.Does a dataset on a specific topic exist

(‘what’)?,

2.For a specific place (‘where’)?,

3.For a specific date or period (‘when’)?

4.A point of contact to learn more about or

order the dataset (‘who’)?

Mandatory fields are often insufficient…..


…optional but critical fields :

Keywords Spatial Representation Type

Geographic Location Reference System Info

Temporal Extent Data Quality Info

Access and Use Constraints Point of Contact

Distribution Info: Online Resources.


Main metadata sections



Mandatory fields:


*


Filled by GeoNetwork


The ISO 19115 – Identification 1

Identification

Point of contact



Thematic

Geographic

NB ISO topic cat. NEED to change!!



Thematic

Geographic


The ISO 19115 – Reference system

NB you need a code

Filled by Geonetwork (WGS 1984)


The ISO 19115 - Lineage

Information about data processing


The ISO 19115 – Distribution Information

The address used for download the resource

The address used for information about the resource

The address used for visualize/download the resource (OGC web services)


The ISO 19115 – Spatial representation

Number of rows X

Number of Columns Y

Thematic dimension Z

RASTER Data


The ISO 19115 – Metadata

Filled by Geonetwork

Unique identifier

Mandatory

Exercise:

Create your own metadata (ISO 19115)

Data source: http://ngdc.noaa.gov/mgg/global/global.html

Dataset: ETOPO1 Ice Surface

Download link (copy from): grid-registered, georeferenced tiff

Interactive map link: http://129.194.231.202/ArcGIS/services/World/wd_etopo1/MapServer/WMSServer


On Geonetwork: New metadata (Administration tab)


http://ngdc.noaa.gov/mgg/global/global.html

http://ngdc.noaa.gov/mgg/global/global.html

Publish your data


Intro- Introduction - Blabla

How exchange metadata in a shared environment?

Distributed search and harvesting

Distributed search: perform a search over all the nodes at the same time.

Harvesting is the process of collecting remote metadata and storing them locally for a faster access.

This is a periodic process to do, for example, once a week. Harvesting is not a simple import: local and remote metadata are kept aligned.

Using some magic, one GeoNetwork node is capable of discovering metadata that have been added, removed or updated in the remote node.


2.2 populate your GeoNetwork - Add data from a remote node

•The harvesting mechanism is based on the concept of a universally unique identifier (UUID).

This is a special id because it is not only unique locally to the node that generated it but it is unique across all the world.

It is a combination of the network interface’s MAC address, the current date/time and a random number. Every time you create a new metadata in GeoNetwork, a new UUID is generated and assigned to it.

•Another important concept behind the harvesting is the last change date. Every time you change a metadata, its last change date is updated.



These two concepts allow GeoNetwork to fetch a remote metadata, check if it has been updated and remove it locally if it has been removed remotely.

Furthermore, thanks to UUIDs, a hierarchy of harvesting nodes can be built where B harvests from C and A harvests from B. Even loops can be created because harvested metadata cannot be modified

The harvesting process goes on until one of the following situations arises:- An administrator stops (deactivates) the node.- An exception arises. In this case the node is automatically stopped.

When a harvesting node is removed, all harvest metadata are removed too.

1. The harvesting engine does not store harvesting results. This implies that if the server is restarted the last results are lost.

2. Changes to the harvesting parameters (for example privileges and categories) are taken into account in the next harvesting run.



Unique UUID (only one copy will be stored!!)


Aa

Ba

Ca

Da

Nodes: A, B, C, DMetadata: a

harvesting

harvesting harvesting


http://129.194.231.202/ArcGIS/services/EnviroGrids/modis_2008/MapServer/WMSServer


2.2 populate your GeoNetwork - Add data from a remote node WMS

WMS

This is the original (not harvested) source


Reduce the number of entries

2.2 populate your GeoNetwork - Add data from a remote node - GeoNetwork

GeoNetwork node


http://lris.scinfo.org.nz/feeds/csw/?service=CSW&request=GetCapabilities&acceptVersions=2.0.2&acceptFormats=application/xml

2.2 populate your GeoNetwork - Add data from a remote node - CSW

CSW

Create your template

Child/Parent

OGC CSW (your) Server configuration


Extras- Introduction - Blabla

prise en main de geonetwork: gestion et publication de métadonnées & harvesting et échange de...

Documents

geonetwork node2

geonetwork opensource1

bonocertificat gomatique

harvest data

synchronization of metadata

descriptive metadata

existing metadata

variety of data providers