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Resc Web>RescProjects>SHaVER>TechnologyComparison (20 Feb 2008, SimoneGiannecchini)EditAttach
Resc Web>RescProjects>SHaVER>TechnologyComparison (20 Feb 2008, SimoneGiannecchini)EditAttachSummary comparison of technology in the SHAVER project
This page summarizes the capabilities of each software system that is relevant to the SHAVER project. Note that the DEWS WCS and WMS use different approaches, largely because the DEWS WMS started out as a separate project. See GeoServerDetails for more information about the different versions of GeoServer. Please correct and add information as required.| Function | DEWS WCS | DEWS WMS | THREDDS | SeaGis- Geomatys | GeoServer - GeoSolutions |
|---|---|---|---|---|---|
| Data catalogue (i.e. the thing that a sysadmin would edit to add a new NetCDF dataset to the system) | Relational database of metadata | XML configuration file | Hierarchy of XML catalog files | PostGRID database | Hierarchy of XML catalog files (GeoServer approach) |
| How data is read from NetCDF files into memory | GADS library (wraps the Unidata Java NetCDF libraries) | Unidata Java NetCDF libraries | Unidata Java NetCDF libraries? | Java NetCDF libs, wrapped as javax.imageio.ImageReader | not tested |
| How data arrays (coverages) are projected into the requested coordinate reference system | Not done | GeoTools is used to convert the requested CRS to lat-lon pairs, then the Java NetCDF libs are used to convert lat-lon pairs to the data's coordinate system. This is done at the same time as reading the data. The key code is here. | (Does the THREDDS WCS support reprojection?) | Java Advanced Imaging libraries: images are manipulated as float/double arrays. | Java Advanced Imaging libraries. Images manipulated either in the best available data type |
| (WMS only) How are coverages rendered to images? | N/A | Custom Java code with WMS extensions, not SLD-compliant | N/A | ?? | SLD 1.0-compliant Raster Symbolizer |
Topic revision: r6 - 20 Feb 2008 - 20:33:09 - SimoneGiannecchini
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