Difference between revisions of "29.05.2012 WP9 Geoprocessing"

Revision as of 16:42, 29 May 2012

WP9 Skype 29 may 2012

Participants: G. Coro, F. Brito, F. Barchetta

Topics

• Update on Thredds activities;
• Summary of the work about WPS.

On Update on Thredds activities

GC illustrates the procedure implemented so far about the invocation of Thredds by a Java library (Environment Explorer Library or EnvEx)

GC demonstrates how the layers contained in the NetCDF files, lying on Thredds, are indexed by another automatic procedure on the GeoNetwork

A discussion on netCDF CF files follows:

FBrito says that the files the community is interested in, belong to the NetCDF-CF category

GC says that formally there can be files with a NetCDF CF structure which are not associated to layers but that can be, for example, images or points-trajectories. The file we may be interested into are the NetCDF CF ones with a GRID structure

FBarchetta says that the NetCDF CF files from MyOcean are generally of GRID type

FBrito proposes to GC to test the system with some files from MyOcean which Terradue will provide

FBrito says that Terradue is interested in WCSWeb Coverage Service access to the files, because this would allow parallelization on the WPS-Hadoop framework

FBrito advices the usage of WPS-Hadoop for all the geo spatial processing

GC will introduce a method, in EnvEx , for retrieving the WCSWeb Coverage Service address for a certain netCDF layer

GC explains the details of the designed architecture for future usage by the D4ScienceAn e-Infrastructure operated by the D4Science.org initiative. services. More information can be found here

FBrito says that it is important that even the suggestions by IRD for the evaluation of geospatial processing have to be taken into account by WPS

Summary of the work about WPS

The discussion moves on WPS: FBrito explains that the activity about the Intersection process between two WFSWeb Feature Service layers was asked by FAO and indicated as an activity in WP3. GC says that geospatial activity on WPS should be part of WP9 or at least mentioned in WP9 FBrito explains that indication came from FAO and some WP3 meeting report this GC says he missed such information as he is not fully involved in WP3 GC reports that the activity on WPS at CNR is currently investigating more on WPS and Hadoop before going to understand the details of the framework by Terradue FBrito says that all the activity on WPS should rely on the Terradue framework GC agrees but explains that the early tests with the package distributed by Terradue gave some errors and it was our opinion to be more expert about the arguments before asking to Terradue for help FBrito advices that the right way should be to make their package work on CNR machines and then investigate about the details. He offers their support for rapidly solve the possible issues GC agrees but highlights that CNR team only started his work on the very last emails exchanged between Terradue and FAO FBrito highlights that Terradue has no fault in this lack of information, as the activity they were following in those mails was declared as part of WP3 Both the parts agree on going forward in the installation and usage of the WPS-Hadoop framework.

Short terms plan:

• Test of the Thredds Library on NetCDF files from MyOcean
• WPS-Hadoop installation troubleshooting at CNR
• Add of a method for retrieving the WCSWeb Coverage Service address from a layer on the Geo Network