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Setting a Catalog's LiDAR Properties

The LiDAR properties of a catalog are:

Setting Gradient

The gradient is a false color map that can be applied to images to emphasize details. The pop-up menu shows samples of each gradient; choose None to remove any previously-applied gradient.

You can change this setting globally on the Settings page, or you can set a gradient for a particular catalog. Any per-catalog setting overrides the default global setting for that catalog.

To change the gradient for a catalog:

  1. Open the Express Server Manager (see Accessing the Express Server Manager).
  2. Click Catalogs on the top navigation bar, then select a catalog in the list.
  3. Select LiDAR on the left-hand navigation, then click Edit.
  4. Select a new gradient from the drop-down list and click Save.
  5. If you have no further settings to edit, click Publish.

Remember that clicking Save in the workspace only temporarily saves your changes until you click Publish or Discard. Clicking Publish sends all edits on all the configuration pages to the live Express Server. Clicking Discard overwrites all pages of the workspace with the current live configuration.

Setting Void Fill Window

If a pixel in an image has no data, the void fill window defines an area surrounding the "void" pixel whose values are averaged and applied to the undefined pixel. Enter 0 to leave the void pixels undefined. Larger values define larger search areas, which is useful for filling large void areas.

You can change this setting globally on the Settings page, or you can set a void fill window for a particular catalog. Any per-catalog setting overrides the default global setting for that catalog.

To set the void fill window for a catalog:

  1. Open the Express Server Manager (see Accessing the Express Server Manager).
  2. Click Catalogs on the top navigation bar, then select a catalog in the list.
  3. Select LiDAR on the left-hand navigation, then click Edit.
  4. Enter a value for Void Fill Window and click Save.
  5. If you have no further settings to edit, click Publish.

Setting Average Points per Pixel

The average points per pixel describes, on average, how many LiDAR points are represented by each image pixel in a rasterized rendering of the image. Larger values result in more detail but longer decoding times.

You can change this setting globally on the Settings page, or you can set the average points per pixel for a particular catalog. Any per-catalog setting overrides the default global setting for that catalog.

To set the average points per pixel for a catalog:

  1. Open the Express Server Manager (see Accessing the Express Server Manager).
  2. Click Catalogs on the top navigation bar, then select a catalog in the list.
  3. Select LiDAR on the left-hand navigation, then click Edit.
  4. Enter a value for Average Points per Pixel and click Save.
  5. If you have no further settings to edit, click Publish.

Setting Elevation Range

The elevation range determines the lowest and highest part of the LiDAR point cloud that will be used in a rasterized rendering of the image. Any points below the minimum or above the maximum are ignored.

To set the elevation range for a catalog:

  1. Open the Express Server Manager (see Accessing the Express Server Manager).
  2. Click Catalogs on the top navigation bar, then select a catalog in the list.
  3. Select LiDAR on the left-hand navigation, then click Edit.
  4. Under Elevation Range enter a value for minimum and maximum and then click Save.
    If you omit either value, the minimum or maximum elevation for the catalog will be used.
  5. If you have no further settings to edit, click Publish.