Menu | Tools > Coverages > Modify > Extract > • By Digitizing • By Feature Layer • By Geometry |
Pop-up | Extract |
Extract a portion of a raster surface or point cloud to create a new coverage with the selected attributes.
Extracting can be done by
• digitizing a line around an area to extract the data within, or outside, the digitized line, or
• extracting by applying a feature layer containing coverage features for the desired area(s), or
• selecting geometry to define the portion of the coverage to be extracted.
When extracting from a point cloud or variable resolution coverage, points with a status value of Rejected are not extracted. |
Interface:
To extract by digitizing or by feature layer, the following dialog box is used.
See also Extract Coverage by Digitizing, Extract Coverage Using a Feature Layer, Extract by Geometry
Settings will define the specific data that will be extracted from the selected area. Only the nodes within the selected area that meet the conditions will be extracted.
For example, with the depth units set to Metres, if you only want nodes with a Depth value of less than 8 metres, you would:
• Double-click Depth in the Available Attributes list to add it to the filter.
• Use the keyboard and/or filter buttons to add “< 8" after the attribute (including the spaces).
The resulting filter displayed in the field will be “Depth < 8".
Option | Description |
|---|---|
Attributes | Attributes associated with the selected surface are displayed. The values of attributes selected here will be present in the extracted surface. 1. Select the attributes to include in the extracted surface. The primary Z layer (Depth, Height, etc.) is mandatory and cannot be turned off. Also, any Designated points within the extents of the feature layer will automatically be included in the extraction. |
Enable filter | Enable filters to extract only specific data from the selected area. Only the nodes within the selected area that meet the conditions will be extracted. 1. Select select the Enable Filter option and enter the filter conditions. |
Feature layer > Name | The names of the open feature layers. Select the layer to use to define the extract area. |
Output surface | The location and file name for the Output Surface. |
Extract data | Include or exclude the surface data within the digitized area. If you select Outside the boundary, only data outside the digitized line would be extracted, resulting in a surface with a hole in it. |