Depth range files are text files that set a range of depths for tiling and contouring data. These files are automatically generated during the contouring process.
The convention for setting depth values is similar to that of other CARIS files:
• Drying heights above the datum are represented as negative values (negative up).
• Depths below the datum are represented with positive values (positive down).
Below is an example of a range depth file. In this example the negative values (-30 to -5) are above the datum, and the positive values (5 to 50) are below the datum.
-50 |
-30 |
-20 |
-10 |
-5 |
0 |
5 |
10 |
15 |
20 |
30 |
50 |
Z-axis convention
Some processes that use depth range files in HIPS do not follow the convention that depths are displayed in positive values (positive down).
These include:
• Variable Resolution: the depth range file in HIPS and SIPS, CARIS Batch and Process Designer for the Variable Resolution process expects positive up (depths presented at negative values)
• Contouring: uses a positive up depth range file, but when it loads the file into the dialog box it will display it according to the z-axis convention (positive down). the process does not currently take a file THE PROCESS IN BATCH>?? , only a list of values, and in Process Designer you can set the z-axis convention.
shift elevation pos up
import points
So after all that is said. The Variable Resolution information, when referencing Depth Range file should mention positive up. The Contouring in the application wizard should mention positive down.
When the Z values in a vertical reference system represent depths, the Z axis direction is “positive-down”. (This is consistent with the HIPS and SIPS depth convention.)" (in Vertical reference system content)
LAS or LAZ files can contain either elevation or hydrographic data. Conversion step 6 for LAS data offers the option to invert the “Z values” from positive to negative, and vice versa, so that the Z‑axis is changed to match the HIPS positive down depth convention. By default this option is turned off. (LAS Options in Conversion Wizard)