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The figure below displays the main functional areas in the Catalogue workspace.

From the Catalogue workspace, you can ( Figure 6.1, “Overview of the Catalogue workspace” ):

  1. select one or several collections from the Collection Tree panel (for more information about collection definition, please see )

  2. set a date/time interval of your interest in the Date panel;

  3. set an area of your interest in the Map or in the Area panel;

  4. submit a query via the Search Catalogue button;

  5. view the result items of your query as metadata in the Table of Results, as images in the Thumbnail list, and as Footprints on the Map;

  6. select one or several items in the Table of Results.

This section describes how to filter a set of collections, showing/using only the meaningful ones.

In the collection tree , there is a possibility to see all keywords grouped by category which are related to a specific or a set of collections. The aim of these keywords is to show only collections that match a set of keywords selected by the user. To open the Collection Filter window, click on that is located in the tree toolbar. A window will be displayed showing all available collection keywords grouped by category.

  • It is possible to select several keywords options.

  • When the "All collections" option is checked, this has the effect to uncheck all keyword options.

  • When a keyword option is checked, this has the effect to uncheck the "All collections" option.

  • When all keyword options are "unchecked" (i.e. when unchecking the only "checked" keyword), this has the effect to check the "All collections" option.

  • Whenever the list of checked options changes, the collection tree is updated.

  • As an implicit effect, every collection not visible in the tree (i.e. filtered out) is not visible in the advanced criteria panel and ignored in the search request.

  • Loading a search criteria unfilter all collections if one of the target collection of the saved search is filtered out.

  • The tip text for the “On-line Collections” and “Local Collections” tree branches is a text composed with the list of selected keywords ("All collections" or "Collections matching keywords: <list of selected keywords>").

In the Collection Tree, you can select several collections of interest by checking the boxes on the left of the collection names. Expand or collapse the whole Collection Tree using the button; deselect all collections using the button ( Figure 6.3, “The Collection Tree” ).

When selected, Collections which are the leaves of the tree, have a red tick in the check box. A branch of the tree will have a red tick if all collections within this branch are selected, and a white tick if only some of the collections are selected.

Note that the more collections you select, the slower the performance of your query will be.

You can resize the collection panel by moving (click and drag) the separator bar between the collection and Area/Date panels.

EOLI-SA offers several ways to define a search area:

You should further refine your search by defining a specific time interval for the acquisition of data.

This is done within the Date panel ( Figure 6.11, “The Date panel” ) in several different ways:

You can access the Advanced criteria by selecting Advanced from the Query Mode drop-down menu ( Figure 6.16, “The Advanced Query Mode” ).

The Advanced criteria are shown below the Date and Area panels. Use the criteria panel vertical scroll bar to view them (if necessary).

By default, there is one advanced criteria panel for each selected collection.

Using the Group Criteria check box, you may re-group the advanced criteria that are common to all selected collections. Common advanced criteria are shown below the Date/Area panel, in a panel named "Grouped criteria"

Advanced criteria allow you specifying collection-specific parameters.

The most common criteria are (depending on the selected collections):

  1. No Frame/Show Frame options. If No Frame is selected, results of your search will appear as striplines (i.e. segment of acquisitions of various lengths). If Show Frame is selected, the results are cut into standard frames. In addition, you can also use a frame range criteria.

  2. Orbit range. You can enter a range of orbits. If you search for one specific orbit only, you can leave the "to:" field empty.

  3. Frame range. This criterion is visible only if you have selected the Show Frame option. If you search for one specific frame only, you can leave the "to:" field empty

  4. Track.

  5. Pass Type (Ascending or Descending).

  6. Swath (where applicable).

  7. Status. This is supported in local collections only. You can select one of several statuses. When none are selected, the status criteria are not used.

For a description of some parameters above, see Glossary .

After having selected the query criteria, the Catalogue functional area will look like in Figure 6.18, “The Catalogue workspace set for query” .

To submit the query, click the Search Catalogue button on the Toolbar at the bottom of the screen.

EOLI-SA performs the query and returns all data products which satisfy the query parameters you set. Results are listed in the Search Results window (See Figure 3.4, “How to select a group of results” )

Check one or several boxes corresponding to the wanted group results and press the Append button to retrieve the results and append them to the previous results already loaded in the Table of Results.

You can select or unselect all the Result Groups clicking on the select/unselected all groups to be retrieved / buttons.

Press the Replace button (active only if results have already been loaded) to retrieve the results and replace the ones already loaded.

At any time, as long as your session does not time out, you can click the Results button in the Tool bar to access the Search Result window and select other group(s) for retrieval.

Using the next/previous group results button arrows , you may retrieve the previous and the following group of results. This will replace the current results shown in the Table of Results. The next/previous group buttons are inactive if there is no next or previous group of results to be retrieved.

The Local Collections (or CD Collections) is a branch of the Collection Tree where you can manage your local collections ( Figure 6.20, “The Collections Tree” ). New local collections can be added from the server (or from a CD-ROM).

With Local Collections, you can:

  1. work in off-line mode ( Section 5.1, “On-line and off-line mode” );

  2. query the catalogue for interferometric searches ( Section 6.7, “Interferometric searches” ).

You can now create your own collections from a remote or a local repository. This option is only available when configured on Eoli Server by the operation team.

If the configuration templates are available, the content of this section will be valid. Otherwise the menu item options will not be present.

Note that to index a collection on your file system, you must be sure that the file names are in accordance with the normalized file name format of the reference collection.

  1. To create a indexed collection on your Local Collection tree, right-click on a branch or the root of the Local Collections branch where you want the collection to be. A menu appears; select the "Create a local collection that indexes a product repository..." item.

  2. You can then select a pre-configured product to index. When selected, you are able to change the parameters for the indexer. Change the collection name and the other parameters.

    • The "Location of product repository" should be under the format protocol://hostname[:port]/path. The port can be ommitted. The protocol can be ftp, http or https.

      For a local collection (on your system), write the full file path in the field or click the button "Select folder", like /home/path/to/local/repository or C:\path\to\local\repository

    • The "Name of collection" is the name that will appear in your local collection tree.

    • The "Credentials" "Username" and "Password" are needed to connect to FTP servers, and sometimes to HTTP or HTTPS servers.

  3. By clicking on "Advanced configuration" you can have access to other usefull options and see the non-changeable parameters for the product.

  4. When you are finished, click on "Save and Index". The reference collection will first be added to your local collection tree, then the indexer will index the configured repository. Note that the progress bar can go backwards if the indexing is recursive and more folders are found.

  5. If no error dialog appears, you can then search this collection like any other collection. If you cannot find any item, then maybe the configuration is wrong (wrong swath additional attribute...) or the files on the repository don't match the product filter nor the parsing pattern. Look in the eolisa.log file for more details and re-configure and re-index the collection.

The interferometric search is used to easily find pairs of products which can be used to derive interferograms.

The interferometric search is based on a special Query Mode (Interferometry) where the resulting products are matched and presented into pairs, according to predefined rules and user specified criteria.

Pairs are composed of a reference (or master) acquisition (the first item of a pair), and a matching (or slave) acquisition (the second item of a pair).

For each resulting pairs, the baseline distance between the 2 acquisitions is computed (baseline of the matching acquisition with reference to the reference acquisition).

In the current version of EOLI-SA, the Interferometry Query Mode is supported by the local collections only. Consequently, you first need to add and update the local collections that support the interferometric search (see Section 6.6, “Adding a Local Collection” to add/update a local collection). Secondly, you need to download or update the interferometry data (baselines ) right-clicking the local collection and selecting the Update Interferometry menu ( Figure 6.28, “How to update Interferometry” ).

You can update automatically your configuration files for the local collections and interferometry search at each connection, setting the Update Local Collection preferences to Auto (see Section 13.2, “The User preferences” ). However, don’t forget to update your Interferometry data files before doing interferometric searches.

You can search for pairs that contain products of any of the following collections (either both from the same collection or any other combination)

To submit the query, click on the Search Catalogue button.

Results are grouped into pairs. In the Table of Results ( Figure 6.33, “Interferometric search results” ), each pair is represented by 3 lines. The lines are grouped together via the group column:

  1. the first line characterizes the interferometric product: It gives indication on the pair itself. The group identifier for this line is referenced as N-1 (N being the reference number of the pair);

  2. the second line characterizes the reference (Master) acquisition. The group identifier is referenced as N-2;

  3. the third line characterizes the matching (slave) acquisition. The group identifier is referenced as N-3.

Interferometric search result items can be browsed and selected as described in Section 4.3, “Browsing, selecting and exporting items” , with the following additional possibilities:

  1. you can select all items composing a pair by clicking on the corresponding first line (this selects the 3 lines).

  2. One selected, you can add the whole pair to your User Set workspace, preserving the first line and the information it contains.

Detailed information related to the Master/Slaving acquisitions or to the interferometric product can be displayed as described in Section 4.3.2, “Item detailed information” .

The Interferometric Product Details window contains :

  1. general information on the current interferometric product;

  2. two radio buttons

  3. three options to modify the colour table for the visualization of the quick look image (see Section 4.3.2, “Item detailed information” );

  4. the quick look image in ILU (by default) or IBP mode;

In addition to the interferometric search described above, there is another way to perform interferometric searches on local collections called DESCW interferometric search. This type of search enables to quickly find acquisitions matching a given catalogue, shopCart or UserSet item.

Right-click on an item in the catalogue, shopcart, or userSet table:

  • A pop-up menu gives options to choose from for each supported interferometric combinations (giving the full name of the collection, for example, "find matching ERS SAR acquisitions for interferometry" , Find matching ASAR image Mode acquisitions , ).

  • options are visible only if the interferometric search combinations are available.

  • Whereas, if the local collection needed to support the search is not present, the options are greyed out.

The inventory search uses the same acquisition matching criteria used for a standard interferometric search (i.e. same track, different orbit, overlapping), but ignoring the date criteria (i.e. the all mission is “scanned”), baseline, Doppler and burst synch criteria.

the selected reference acquisition and its matching acquisitions (i.e. the result of the quick interferometric search) are displayed in a pop-up result table window with the usual table toolbar buttons. Each item in this table indicates its Baseline, Doppler, Burst synch (when applicable) and coverage percentage with respect to the reference acquisition.

The reference acquisition is highlighted in blue. It is possible to change it by clicking on an other item of the table. The Set As Reference button becomes then enabled in order to validate the new reference choice as shown in Figure 6.38, “DESCW Interferometric Pairs Dialog Reference Change ” .

In that case the baseline , Doppler and coverage percentage of all items are re-calculated against the newly selected reference.

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry