1. w w w. n e s s t a r. c o m Madiera Georeferences - extending search for data Ørnulf Risnes

2. w w w. n e s s t a r. c o m A Geo-referencing system Current problems with the DDI –Difficult to use geographic references in a consistent manner –Difficult to use geographic references for something useful

3. w w w. n e s s t a r. c o m What do we need? “We need a geographic identification of data resources” –Associate studies with geographic coordinates “A coordinate-aware interface that can support the searching process” –Search for studies using geographic coordinates

4. w w w. n e s s t a r. c o m Getting geographic coordinates into studies Potentially large amounts of coordinate data Tagging process should be mostly automatic Fortunately,the DDI 2.0 has room for our coordinates! Norway 4.789583 33.637497 57.987915 80.76416

5. w w w. n e s s t a r. c o m Geographic tagging using Nesstar Publisher Nesstar Publisher can talk to a standard openGIS map-server (WFS) Web Feature Server Publisher Nesstar Server Select coordinates from list of available maps Publish dataset with coordinates

6. w w w. n e s s t a r. c o m Geographic tagging using Nesstar Publisher Publisher-user specifies map and subregions Dataset/ DDI

7. w w w. n e s s t a r. c o m Geographic tagging using Nesstar Publisher DDI with geographic coordinates is published to a Nesstar-server … 4.789583 33.637497 57.987915 80.76416 … Nesstar Server Now, the coordinates “live” on the server and can be utilised in a search procedure

8. w w w. n e s s t a r. c o m Geographic searching in the Madiera Portal The best way to select area of interest? –Search for name of country or region? –Using a map-interface? It depends on the situation… …but today we demonstrate a map-based search interface

9. w w w. n e s s t a r. c o m Map-search requirements The user must be able to: Select map from a list of relevant maps Zoom into an area of interest Submit the coordinates of the area of interest as a parameter of a search query Allow for combination of area of interest and additional parameters (i.e. text-based search)

10. w w w. n e s s t a r. c o m Map-search-interface …can be plugged into the Portal or any Nesstar Server …talks to a standard openGIS map-server (WMS) Nesstar Server/ Madiera Portal Map interface Web Map Server

11. w w w. n e s s t a r. c o m Map-search-component …lets the user choose maps from a list of available maps …renders map image from the coordinates

12. w w w. n e s s t a r. c o m Map-search-component …supports zoom and pan Demo: http://damad.essex.ac.uk/portal/index.htmlhttp://damad.essex.ac.uk/portal/index.html