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3.5.7 Data Source Properties
To set the defaults for a data source bring up the Properties dialog by right clicking (or double clicking) on the data source name in the data sources panel of the Field Selector window and select Properties:
images/DataSourceMenu.gif
The Properties Dialog is different for different types of data sources. Here is the dialog window for a gridded data source:
images/DataSourceProperties.gif
Any displays that are showing data from a data source can be automatically updated by selecting the Reload Displays button. When this is selected all data will be reloaded and the displays will be updated when the user presses Apply or OK.
3.5.7.0 Basic Properties
You can change the displayed name with the Name field.

Some data sources can automatically update themselves by selecting the Active button. For example, if you had a set of most recent satellite images you can turn on Polling and have the data update to the latest images every N minutes.

For point data you can define Time Binning settings (not shown) by selecting a Bin Size (e.g., 5 minutes, 1 hour) and a Round To value (e.g., On the hour, 15 minutes after the hour). This will map all the observation times into the nearest bin. The smallest time is rounded with the Round To value (e.g., if Round To was "10 after" and the smallest time was 10:23 then this time would be rounded to 10:20). This is the base time. Each actual observation time is mapped into a set of bins of Bin Size starting at the base time.

3.5.7.1 Times
The Times tab allows you to select the times to use. The drop down menu has two menu items: Use Default and Use Selected. Click the drop down menu, choose the Use Selected menu item and select individual times. You can also right mouse click in the list to show a popup menu that allows you to select different strides (e.g., every 3rd time).
images/DataSourceTimes.gif
A version of this time subsetting window is used in the Field Selector. Here, you have additional menu items: Match Time Driver and Set As TIme Driver to allow you to use the time driver times or to set the selected times as the time driver times.
images/DataSourceTimeSubset.gif
3.5.7.2 Spatial Subsetting
For grids and other data source types the data can be subset and decimated with the Spatial Subset tab. The X Stride, Y Stride and Z Stride menus allow you to decimate a grid, selecting every Nth point. The Bounding Box allows you to define a spatial area to load. The default spatial domain of the data is shown by the blue outline box. To select an area just drag on the map. Once a subset is selected it can be resized (grab on the little black selection points) moved (grab somewhere near the box) and delete (press the Delete key). Specific lat/lon values can be entered in the fields on the left. The Match Display Area checkbox allows you to define a spatial subset option. By checking this option, the map area will be disabled and this will be the default option for all the variables of this dataset.
images/DataSourceSpatialSubset.gif
A version of this spatial subsetting window is used in the Field Selector. Here, you have drop down menu of items: Use Default Region, Select A Region and Match Display Region. These options allow you to use the default region, or to select a region, or to match the region of the active view window's display area. The decimation and spatial subset are shown in different tabs:
images/DataSourceSpatialSubsetField.gif
The spatial subsetting window for the Satellite imagery also provides the preview of the dataset:
images/DataSourceSateSpatialSubsetField.gif

The advanced tab for the the satellite imagery allows you to override the default properties the IDV uses to specify other aspects of the image data. The default values in the Advanced tab reflect what is showing in the Region tab. By default, all the text fields in this tab are disabled. To enable these text fields, you can select Select A Region in the Region tab, all the text fields except the Magnification will be editable. The information in the Region tab will be passed to the Advanced tab. Any changes in the Advanced tab will also be passed back to the Region tab.

There are two different approaches to enable the Magnification widget. First, you can un-check the Enable Adaptive Resolution checkbox in the user preferences to enable the Magnification text field. Second, you can un-check the Enable Adaptive Resolution checkbox in the view window Projections drop down menu. In both cases, you need to reload the data to get the widget enable or disable if the data already loaded.

images/DataSourceSateAdvanced.gif

You can specify the placement point of the image (e.g., Center, Upper Left) and its location. Location can either be specified as an Line/Element Area coordinate or as Latitude/Longitude. Use the cycle buttons to select the type of location to use.

The map button, will list the various center and corner locations of the different available map views. This allows you to choose a lat/lon position.

Image size and magnification can also be set. Click on the slider icon to change the values.

The linked button (), when selected, will automatically change the image size as the magnification is changed.

The Full Resolution button allows you to set the magnifcation, image size and position to be the full image resolution.

3.5.7.3 Details
The Details tab shows further information about the data source, e.g.: any documentation associated with the data, what files or urls are used, etc.
3.5.7.4 Metadata
For grid data sources the Metadata tab shows the NetCDF metadata.

 


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