When working with vector data within MicroStation and LIDAR data within TerraScan there are times when the user may wish to have the vector data appear on top of the LIDAR data. There are multiple options within MicroStation and/or TerraScan to accomplish this.
There is a point display option within TerraScan that allows the user to specify whether they wish to view the data as points or as a raster. Viewing the LIDAR data as a raster causes the vector data to appear underneath the LIDAR data, while viewing the LIDAR data as points will allow the vector data to appear on top of the LIDAR data. A keyboard shortcut can be created to toggle between the two different display methods.
Many times a user may want to keep the points displayed as a raster as opposed to as points but still want to be able to keep the vectors above the data. This leads into Option 2. A user can specify the active z of the view display so that all the vectors are offset from the LIDAR data. The first step in user this tool is to determine the elevation data of the LIDAR data in question, this step ensures that the vectors can be placed above the maximum elevation value. Once the elevation value has been determined the following MicroStation key-in command can be used to set the active display depth (z):
Click enter and then click on the view to specify that active display depth.
In the example below it was determined by reviewing the LIDAR data statistics that the elevation value required in order to have the vector data above all the LIDAR is 1450 meters (the maximum elevation value for all LIDAR data within the project).
If a user is looking to have the vector data appear on top of the LIDAR data will digitizing the TerraScan Mouse Point Adjustment tool can be used to specify an elevation offset to the vector during the process. This dZ offset is a constant offset that is applied to the elevation values of the element vertices.
Often times a user may want raster data to be displayed in addition to the LIDAR data. Sometimes users may want the points to be If using MicroStation’s Raster Reference as opposed to TerraPhoto’s Raster Reference, it is important to verify how that raster is being loaded into the program. There are three different Display Plane Options under Display Print within MicroStation: Background, Design or Foreground.
Specifying Background will place the image behind any vector or LIDAR data
Specifying Design will place the image in front of any LIDAR data but behind any vector data
Specifying Foreground will place the image in front of all LIDAR and vector data