Description
The AddComputedBand process adds a band to an existing coverage by applying an expression to the existing data.
Update
A raster surface, point cloud, or variable resolution surface in CSAR format.
Outputs
An updated coverage in CSAR format.
Command Line Syntax
carisbatch --run AddComputedBand --compute-band <value> --z-axis-convention <value> --computed-band-type <value> [options] <update>
User Interface Command
Add Computed Band
Options
The following table describes the parameters available for this process.
Parameter |
| |||
|---|---|---|---|---|
Long | Short | Description | Can Repeat | Notes
|
--compute-band | a | A string specifying the name of the output band to be computed from the input points. | FALSE | This must be specified explicitly. |
--expression | e | A string specifying a numeric expression. The following operations are supported: IF, THEN, ELSE, AND, OR, NOT, IN, +, -, *, /, ^ (exponent), <, >, =, and != (not equal). For example, "Depth + 1" or "If (Depth = NO_DATA) Then NO_DATA Else If (Depth < 40) Then 0 Else If (Depth < 20) Then 1 Else If (Depth < 0) Then 2 Else 3. | FALSE | |
--expression-file | A file containing the expression. If an expression is also specified, an expression file is ignored. | FALSE | ||
--z-axis-convention | z | A string specifying the Z-axis convention of the expression. UP: Any elevation band values in the expression are treated as heights. DOWN: Any elevation band values in the expression are treated as depths. | FALSE | This must be specified explicitly. |
--computed-band-type | A string specifying the type of data in the output band. • Elevation: The output band contains elevation values. • Numeric: The output band contains numeric values. | FALSE | This must be specified explicitly. | |
Example
To use this command, refer to the following example.
Example | ||
|---|---|---|
Objective | You want to add a band to your point cloud that displays only data that has been classified as Low Point (noise). Also, all data on this band is to have its elevation values shifted by -10m. | |
Description | Command Line Syntax | |
The new band will be called LowPoints. | --compute-band LowPoints | |
The following expression will be used to populate the new band: IF (Classification = 'Low Point (noise)') THEN Depth-10 | --expression IF (Classification = 'Low Point (noise)') THEN Depth-10 | |
The new band will use the Z-axis convention of up is positive. | --z-axis-convention UP | |
The new band will contain elevation values. | --computed-band-type Elevation | |
The band will be added to PointCloud.csar located in the D:\SampleData directory. | D:\SampleData\PointCloud.csar | |
Command Line |
| |
Outcome | A new band is added to the point cloud and displayed in the Layers window with the assigned name. This band will display only points that have been assigned the classification Low Point (noise) and the values of the points will be 10m less than the points in the original source data. | |
Extra Notes | N/A | |