Adding a Water Profile
If the pressure data is used for the depth sensor, the choice of the Water parameter between Standard ocean, Average density and Density profile determines how the depth is computed:
| > | Standard ocean: Depth is computed as detailed in "UNESCO Technical Papers in Marine Science n°44, Algorithms for computation of fundamental properties in seawater" with parameters of a standard ocean (temperature 0°C, and salinity 35 PSS - 78). Gravity is computed function of latitude as detailed in "UNESCO Technical Papers in Marine Science n°44, Algorithms for computation of fundamental properties in seawater". |
| > | Average density: Depth is computed from the provided average density (999.972 kg/m3 if not provided) via the following formula: |
| > | Density profile: Depth is computed as detailed in the UNESCO technical paper but the density is integrated all along the water column using one or several density profile(s). |
The calculations are performed using pressure relative to the surface, that means the atmospheric pressure has been compensated. For more information, see Managing the Processing Parameters.
| 1. | Select the Processing parameters > Add water profile menu. A browser window opens. |
| 2. | Select a water profile file. Files with a .db extension are automatically added, .csv, .txt, .log need a conversion before loading. |
A profile is added in the Processing panel, under the Water item.
Step 2 can be reiterated to add several profiles. The profiles appear in a list.
| 3. | Select the Profile selection between Location and Time. |
| > | Location: the nearest water profile in distance is used |
| > | Time: the last water profil in time is used unless the Interpolation profiles is activated. |
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Atmospheric pressure is removed from the measured pressure whatever the selected type of water (1013.25 hPa if not provided). If the pressure sensor provides data under MiniSVP protocol to the INS, then we suppose that the atmospheric pressure has already been removed so the field Atmospheric Pressure must be set to 0.0. |
Importing Water Profiles from Different Formats
Water profiles stored in column-based text files can be imported after a conversion.
| 1. | Select the Processing parameters > Add water profile menu and select a column-based text file containing a water profile. |
| 2. | Click OK in the warning window to open the conversion tool. |
| 3. | If you have an associated water profile definition (.wdb), set the Path of this file. |
| 4. | Without a profile definition file, expand Definition and select Definition file wizard... |
The wizard opens, the file contents are displayed on the right helping the configuration.
| 5. | Setup the following parameters: |
| > | Lines to skip before actual data ("-" signs appear on the file display on the right) |
| > | Column separator and its Value, several separators are possible |
| > | Column number |
| > | Unitparameters (Multiplier, Divisor and Offset) in order to apply a conversion when the unit in the text file is not the unit expected in DELPH INS. Select the unit of your file in the list or manually define the affine transformation: |
| 6. | Save this file, close the wizard, select the Path in the import tool and start the conversion. |