Filter by Intensity

Use Filter by intensity to filter scan points based on intensity values. Intensity is a measure of the laser reflected back to the scanner. Typical intensity range using a Maptek Gen3 mkI and a Gen3 mk II scanner vary between 350-1400.

This filter is useful for filtering dust clouds (typically low intensity) or to filter high intensity points for locating survey reflectors.

1. On the Position and Filter ribbon tab navigate to the Filter group. From the Filters drop-down list select Intensity.

   

2. Specify a From and To range for intensity values or select an area to populate intensity values.

   

3. The Populate from point selection tool can be used to minimise the number of steps needed to achieve the same result by selecting an area which represents intensities to be filtered by and press "Populate from point selection" button (bellow middle image) click away in a blank area to de select the scan points.

4. Select whether to keep values inside or outside this range. In the example above, points from 591 to 1118 intensity values will be kept, and anything else filtered out.

5. Select the required Filter combination. 

6. Click OK or Apply.

The example below shows a low intensity dust cloud (blue coloured particles) still unfiltered.

The example below shows the low intensity dust cloud (blue coloured particles) has been filtered out.

Note: The points can be recovered using the Show All option.