The GLOWA Volta Geoportal an interactive geodata repository and information system
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TheGLOWA Volta Geoportal
an interactive geodata repository and information system
Dr. Serge Shumilov, Joscha LaubachDepartment of Computer Science III
Antonio Rogmann, Peter WittkötterCenter for Development Research (ZEF)
University of Bonn
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What is Geoportal?What is Geoportal?
Easy interactive remote access to the GLOWA Volta data service
Geoportal is a Web-based information system providing:
Data server
Data catalogData catalog
Web Browser
SMB
Internet
Web server
GeoportalGeoportal
Data storage
Data storage
ESRI ArcGIS Client
Intranet
HTTP
WMS Client Web Browser
HTTP
SMB / NFS
JDBC
WMS Client
Cataloguing and management of heterogeneous datasets
Services to publish, access and share data over the internet
Tools for interactive search, visualization and analysis of data
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What Services does the GeoPortal provide?What Services does the GeoPortal provide?
Based on internationally approved standards the GeoPortal provides a variety of services:
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Main Characteristics of the Geoportal ArchitectureMain Characteristics of the Geoportal Architecture
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Component-based Geoportal ArchitectureComponent-based Geoportal Architecture
Geoportal architecture consists of several components providing particular portal's functionalities.
Data server (Linux)
Web server (Windows)
Apache Web server / Tomcat
ESRI ArcGIS Engine RuntimeESRI ArcGIS Engine Runtime
JSP/JavaGeoportal
DataManagers
OrganizerOrganizer
Viewers
Data storage
ESRI DBESRI DB
ESRI DBESRI DB
ESRI DBESRI DB
…
File system
Data catalog
Geoportal DB
Downloaders
SearchSearch
MetadataManagerMetadataManager
UserManagerUserManager
ContentManagerContentManager
MapViewerMapViewer
GoogleMapViewerGoogleMapViewer
DataViewerDataViewer
DataManagerDataManager
DataDownloaderDataDownloader
MapDownloaderMapDownloader
Virtual Machine (VMware)
JDBC
SMB / NFS
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The GLOWA Volta Geoportal The GLOWA Volta Geoportal
Data search find and assess download
Interactive geodata compose, view and
analyze on map download from map
Publish and share data index and administrate assign use rights upload for distribution
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The range of operations provided by the Geoportal is determined by the assignment of the user to a functional group
The goal is to warrant a coordinated web-based access for indexing, up- and downloading of data and management of the system ...
... with focus on the protection of owner rights of the resources hosted by the Geoportal!!
User and Operations in the GeoportalUser and Operations in the Geoportal
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User and Operations in the GeoportalUser and Operations in the Geoportal
„Consumer“ – Level
Guest (registered as “all” in the user database) ► search in meta data catalog► visualize map based geodata with Map Viewer► download data in public domain► don’t need to be registered personally in the Geoportal
Member of a specified user group (e.g. an institutional group)► same operation as the “guest”-user► download of data with access rights only for his user group► needs to have an user account in the Geoportal
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User and Operations in the GeoportalUser and Operations in the Geoportal
„Contributor“ – Level
Meta Data-Uploader► enter, delete and upgrade of your own meta data sets ► determine which user groups are allowed to access their data indexed in the
catalog
„Administrator“ – Level
Meta Data-Administrator► control, edit, delete and approve of all meta data sets
Geoportal-Administrator► administrate user database and content of Geoportal
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Meta Data in the Catalogue-System Meta Data in the Catalogue-System
The GLOWA Volta Geoportal offers several ways to find data and other resources (documents, maps, applications) in the GLOWA Volta datastock by using the catalogue service ...
The data are indexed in a catalogue consisting of a range of meta data elements
This meta data elements provide detailed information, usable to assess if the resources are applicable for the own requirements of data processing and information
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Search for Data and DocumentsSearch for Data and Documents
Keyword-based search in all catalog elements. Filtering by „AND“ search relation
Search in predefined subject / topic list
Approaches to find data and documents by „search in meta data“
Selection for geodata embedded in Web Map Services only
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Search for Data and DocumentsSearch for Data and Documents
Approaches to find data and documents by „advanced search ...“
Advanced search to find data by criteria based on selected catalog elements
Combination of different criteria frequently used
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Search for Data and DocumentsSearch for Data and Documents
More approaches to find data, documents (and maps)
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Scroll through a result shortlist
Meta data sets which seem to be interesting can be reviewed in a detailed description within the data viewer
Short List
Search Results in Data Viewer Search Results in Data Viewer
Detailed Description
Basic information needed to assess the data in relation to its usability is provided in the long version of the meta data set
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Search Data by Relations in Meta Data SetSearch Data by Relations in Meta Data Set
Uniform Resource Name (identifier) acts as link to related data set
Topical relationships between resources (raw-data processed data) can be browsed through meta data sets
Meta data set can be downloaded as text file
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Data Download Data Download
By obtaining the proper access rights, data can be downloaded directly from the catalog search result
Download button
Permanent link can be copied and used e.g. in favourite lists
Delivered as compressed file (.zip)
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Protection against unallowed DownloadProtection against unallowed Download
The major part of data in the GLOWA Volta datastock is protected by owner rights
To access protected data, the user has to have an user account in the Geoportal
The data of interest needs to be assigned in the meta data set to the user-group of which the user is a member
To get a membership, the Geoportal administrator has to be contacted by the user (by email)
Administration tool to generate user accounts and ...
... for user-group management
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Visualization of Geo-Scientific Data on Interactive MapsVisualization of Geo-Scientific Data on Interactive Maps
Geo-scientific data are stored in different formats with different behavior in the Geoportal Single raster and vector files Relational geodatabases Map Projects (mainly ESRI ArcView
and ArcGIS format) Web Map Services
Web Map Service (WMS) displays spatial data in its cartographic context interactively by providing fundamental GIS functionalities as raster images separated from the (protected) original geo data using a common internet browser
WMS: specified by the Open Geospatial Consortium (OGC) supported by a broad range of GIS-clients (ArcGIS, GRASS, Open Jump, ...) interoperable with other, distributed Open GIS-services: WMS, Web Feature
Service (WFS), Web Coverage Service (WCS), ....
Meta data editor with elements to describe geo-data properties
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Volta Basin Water Allocation System (VB-WAS)
Types of Interactive MapsTypes of Interactive Maps
The Geoportal provides two kinds of interactive maps as Web Map Services
Project maps composed of several layers with
specific symbolization mainly aimed to inform about
GLOWA Volta Project research
Single WMS layers searchable in the catalog and to
be combined in one map viewer interface by the map basket
mainly used to► assess geodata in order to
download and process locally ► analyze spatial relationships for
decision supportSeveral the-matic layers in specific scientific context
Population Density 2000 in theVolta Basin
One thematic layer (popu-lation) and one basic layer (basin border)
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Access Interactive Maps with Map BasketAccess Interactive Maps with Map Basket
The Map Basket is a service to combine several WMS in one Map Viewer interface Search only WMS
Add WMS of interest to the map basket
Content of map basket
Direct download is yet possible
Selectable layers for download. If required, together with the map project file (.mxd)
Result List
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WMS link to copy for using the WMS in another WMS client like ArcGIS
Organize the Map with Map ViewerOrganize the Map with Map Viewer
The map viewer is a cartographic interface in a web-browser
Manipulation of layer visibility and display range on map
Legend corresponds with visible layers
Three WMS
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Gain Information with Map ViewerGain Information with Map Viewer
Example: NDVI is composed with climate stations (linked with rainfall time series)
Info button activation followed by mouse-click on map-object provides object related information
Compare 1. WMS: mean annual NDVI with
2. WMS: mean yearly rainfall
Additional information:Further available climate parameters collected by climate station
Additional information:link to meta data set in order to get detailed information about the station
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Download Data with Map ViewerDownload Data with Map Viewer
WMS only displays interactive images of maps. Usable data are to be downloaded – if allowed for the user
Layer of interest can be selected
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Contribution of Meta Information to the GeoportalContribution of Meta Information to the Geoportal
Data about data (meta data set = catalog entry) describes data and resources - independently of the data storage location
Web-Services (e.g. for data download) offered by other institutions can be linked within a meta data set
Lacking web-based facilities for data distribution: “contact” information leads on the way to get data
Meta data uploader gets the meta data upload tool
Offline (in the field) created catalog entries can be uploaded
Delete and edit own catalog entries
Add new catalog entry
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Edit Meta Data with Meta Data InterfaceEdit Meta Data with Meta Data Interface
Uniform Resource Name Generator (URN) gives each dataset described in the catalogue an unique identifier
Uniform Resource Name is automatically generated
URN syntax reflects properties of the described resource
Unique identifiers avoid redundancies and confusion in the datastock
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The Editor provides an easy to use interface with about 25 element fields
Fill in of all elements is not mandatory
Assignement of users or user-groups allowed to gather the dataset. Only needed if dataset is stored in the Geoportal data bases ready for download
Range of elements can be extended flexibly if needed
Quality of entries controlled by Meta Data Administrator
Edit Meta Data with Meta Data InterfaceEdit Meta Data with Meta Data Interface
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Data indexed in the Geoportal Catalog can be located outside or inside of the central database hosted by GLOWA Volta (or
another hosting institution) Advantage to store distributive data on the central data server:
use of Geoportal Services to share data via web
Integration of Data into the GeoportalIntegration of Data into the Geoportal
Integration of own datasets into the central database needs … … a registration to get the necessary meta data upload and
administration rights (contact the Geoportal administrator)
… the consideration of certain standards in regard to the preparing of data which is going to be shared
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Standards in data quality (control), naming conventions and exchange formats improve the use and processing of data
Data Management StandardsData Management Standards
Significant file naming simplifies the organization of data files (e.g. after download on the local machine)
To inform about the level of data quality just gives the data quality!
Meta data element Quality control
glowa_hyd_discharge_arli-dou-burkinafaso_1978-1987_monthly.csv
Project Scientific discipline and topic
Spatial coverage Time frame
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GLOWA Volta Data Management Workflow describes steps in data handling and transfer
Data Management StandardsData Management Standards
Step 2: identify the data by assigning
an URN and/or name
Workflow will be published as web-page close to the Geoportal!
Data management step icons are linked with
explaining documents
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Upload of data sets, documents and other resources to the central database
This was shown before
Server Area Local Area
Data upload as next step after meta data upload
Integration of Data into the GeoportalIntegration of Data into the Geoportal
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ZEF-Data-Server
Intranet
External User
Admin
SharedData
UploadedData
Local Data
Open Area
SSH
Meta DB
ZEF-Member
Central Data base
Geoportal
Secure Area Transfer Area
ZEF-Inhouse Extern
Integration Distribution
Integration of Data into the Geoportal InfrastructureIntegration of Data into the Geoportal Infrastructure
Data transfer at the Center for Development Research (ZEF)
Coordinated data integration and distribution
Administrator controlls integration
Only quality controlled data meeting the standards is transferred into the central data bases – ready for distribution
Registration and login- data transmission
Administrator restores new uploaded data