Feature Collection Resolution Filter

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Summary: This filter limits the resolutions of feature collection data that pass through it to a user-defined range of allowable resolutions.

Input:

Output: Coverage , Feature , Feature Collection

  • Description: A feature collection that will only provide values within a specified resolution range.

Attributes:

  • Minimum Relative Resolution Set the minimum resolution BELOW the input resolution to allow data to pass through the filter. Use -1 as a value to indicate the absolute resolution should be used instead.
  • Maximum Relative Resolution Set the maximum resolution ABOVE the input resolution to allow data to pass through the filter. Use -1 as a value to indicate the absolute resolution should be used instead.
  • Minimum Absolute Resolution Set the absolute minimum resolution of data that will be allowed to pass through the filter. Use -1 as a value to indicate the relative resolution should be used instead.
  • Maximum Absolute Resolution Set the absolute maximum resolution of data that will be allowed to pass through the filter. Use -1 as a value to indicate the relative resolution should be used instead.

Details

When navigating within a ViewPoint, and viewing a pipeline of feature data that includes a Feature Collection Resolution Filter process, each time you zoom to a new resolution WorldView checks to see if the new resolution is within the range specifed in the Feature Collection Resolution Filter process. If the new resolution is within the range, the data from the feature pipeline appears. If the new resolution is outside the range, the feature pipeline returns a NULL value (nothing is displayed from that pipeline) .

You can specify the range based on either absolute resolutions (using Minimum Absolute Resolution and Maximum Absolute Resolution) or relative resolutions (using Minimum Relative Resolution and Maximum Relative Resolution).

Using absolute resolutions is very simple. If you don't want the feature data to appear at resolutions higher than 20 (for example), simply type 20 for the Maximum Absolute Resolution value. Likewise, if you don't want the feature data to appear at resolutions lower than 17, type 17 for the Minimum Absolute Resolution value.

Use the relative resolution attributes to filter a feature pipeline relative to the native resolution of that pipeline. For example, if you entered a value of 2 for the Maximum Relative Resolution attribute, and the native resolution of the pipeline was 23, WorldView would only display data for the pipeline up to resolution 25 (23+2).

You don't have to specify both a Maximum and a Minimum limit, but you can if you want. Set an attribute to -1 if you don't want WorldView to use that attribute.

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