oceanbrowser viewing service, overview and upgrades alexander barth (1), charles troupin (2), aida...
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OceanBrowser viewing service, overview and upgrades
Alexander Barth(1), Charles Troupin(2), Aida Alvera Azcárate(1),
Jean-Marie Beckers(1)
(1) University of Liège (Belgium), (2) IMEDEA (Spain)
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OceanBrowser Web-based view of data products http://gher-diva.phys.ulg.ac.be/emodnet/
Overlay of different data products
Web-based viewer Web-based viewer of climatologies (in NetCDF)
Based on OGS standards (Open Geospatial Consortium): WMS, WFS
Server:
Implemented in Python and running on Apache using mod_wsgi
NetCDF files organized in folders → file structure mapped in a hierarchy of Layers
Adding a new climatology requires just to copy a file in the data folder of the WMS Server
Client:
Based on OpenLayers javascript library
Support for animations in web-browser
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Vertical sections
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User interface improvements
Output formats
Available output formats for exporting graphics:
PNG (ubiquitous web browser support)
Scalable Vector Graphics (SVG). W3C standard since 1999. Supported by all major browsers except Internet Explorer.
Keyhole Markup Language (KML). Google Earth and NASA World Wind
Encapsulated PostScript (EPS). Preferred format for numerous scientific journals
Animations (mp4 and webm)
Available styles
Styles Interpolated Filled contours Simple contours
Colorbar options Colormap Range
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New features
Search for layers User feedback Export animation
as mp4 or webm
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OceanBrowser 3D Experimental
3D version (based on WebGL)
User library EarthGL tinyurl.com/EarthGL
No browser plug-in required
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Client side rendering
http://gher-diva.phys.ulg.ac.be/OceanBrowser-opendap/ (experimental)
Data access through OPeNDAP (binary)
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1d and 2d plots
Axes can be longitude, latitude, depth or time Possibly to interact directly with the data Rendering data in the web browser is possible but can be challenge of large data set
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Upgrades for EMODNET Chemistry
Which observations (CDI) were used in a data product?
Data extraction along the coast line with a list of predetermined sections
Labels indicating geographical features (e.g. towns, borders, river outlets)
User Feedback Integration with other portals for the physical
environment (EMODNET physics or GMES) Measurement density
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Work flow forSubmitting gridded
products Info at http://tinyurl.com/OceanBrowser (link to
http://modb.oce.ulg.ac.be/mediawiki/index.php/OceanBrowser) Have a look at the DIVA output before sending them (look for
artefacts, impact of outliers, …) Verify that the netCDF attributes (in particular long_name,
unit, title, institution) are accurate. Upload the file to our server New products are not automatically visible Send me an email ([email protected]), I will update the server This call: emphasis on validation!
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Time series products
Procedure: Create an index file (see http://tinyurl.com/OceanBrowser for format) It is suggested to use ODV for manual generation of plots (other tools might be
used for batch mode). The minimum number of points per plot should be 4 or 5. Data centers will generate plots in EPS format and then convert them in SVG
format Only the SVG files need to be submitted Scatter points plots should be used without lines to connect plotted measures.
Submitting: Check all plots and the index file using the validator at http://gher-
diva.phys.ulg.ac.be/emodnet-chemistry/html/validator.html. Send the new products to [email protected] for a
general revision about guidelines points
Issues Problems in converting EPS to SVG. No interaction with the time series