WikiPrint - from Polar Technologies

What is ESGF Tools UI?

A tool that is integrated in ?ToolsUI NetCDF Java for including a desktop client for ?ESGF services, with features like search of data along multiple nodes, download manager and metadata aggregation for allowing a full exploration through dataset services.

The added functionality in ToolsUI NetCDF is in ESGF tab. This tab contains 4 sub-tabs, each one with an specific functionality.

No image "tabs.png" attached to ESGFToolsUI

Getting started

Pre-requisites

JDK from Sun / Oracle (1.5 - newer) or OpenJDK 6

OpenJDK 7 is not supported

Installation

  1. Download the zip in ESGFToolsUI-0.4.1.zip
  2. Unzip it
  3. Go to unzipped directory

Search of ESGF Climate Data

A search in ESGF returns the records that matching the search constraints after querying to an index node. The ESGF search service is always served by a index node and this node is able to do local and distributed searches. In this tool, the distributed capabilities of the ESGF are used so any selected index node will be used to query all nodes in the ESGF system.

The search panel of ESGF climate data is in the "Search" sub-tab. The search constraints are defined by parameter configuration in the panel or by introduction of a free-text search query. The result are the number of records finding in the federation that satisfy the constraints of search (in panel in bottom right area). Record is the physical replica of a climate dataset that are stored on a data node.

Selecting a index node

The searches are executed in a index node of the federation. Each node have different processing times for the response. For this reason, the user is allowed to select the index node where prefers send the search petition.
The index node may be configured in the top left drop-down list. After selected a new index node the search panel is updated.

A global search in ESGF must be the same result in all ESGF index nodes (according to ESGF wiki). However, for reasons external to this application and that are related with bugs in ESGF search service, sometimes may give different results







Selecting search parameters

The search parameters can be configured on the panel in two ways:

The tree of parameters shows the parameters with bounded values which are defined by the federation. In the first level is the name of the parameter and the number of its bounded values. In the second level are the parameter values, each one with the count of records that satisfy the previous configured constraints (restrictions that are listed in the "configured parameters" section) + the new constraint (parameter-value).

For each parameter can be selected more than one value. Finally, for adding the selected values on the tree in the search constraints you must click on "Add parameters" button.

All values selected in a parameter are linked by logic OR and the selected parameters are linked by logic AND. For example, if are selected:

Then the result will be the number of records that belong to BNU-ESM model and made by BNU or CCMA institutes. In this case, only will be returned the number of records that belong to BNU-ESM model made in BNU institute because don't exists any record of BNU-ESM model that has been made by CCMA institute.

Generally, the parameter configuration is as follows, where "P" is a parameter and "V" a value.

After adding new parameters the search panel is updated (?Add parameters? button). Now in the tree, all parameters that already have values configured only shows this values. This happens because the allowed values ??for a parameter are always those that do not result in an empty set if they are selected. To configure a parameter previously configurated you can uncheck the previously configured values and then click on "Add parameters" or you can remove them in "Configured parameters" section.

The parameter selection in drop-down list (top right) allows values configuration of some parameters. In this list are contained the parameters without bounded values and that for this reason can't be configured in the tree of parameters. Also contains the parameters with bounded values. After selecting a list parameter, below of the list will be displayed a specific configuration panel for the selected parameter.

In the figure below you can see the panel that is displayed when ?temporal range of data coverage? is selected. Finally, to be added this configuration click in the bottom button "Add parameter" ("Add temporal range parameter" in this case).