Import ASCII Sensor

Owned by Tore Sannes (Unlicensed)
Last updated: Oct 13, 2014
2 min read

In this section:

Introduction

This command will import and replace the Sensor Data of the selected Multibeam Survey lines.

 


The Import ASCII Sensor dialog.


The content of the menu

The Input Sensor file part:

By clicking the browse button the file can be located in the file system on the computer.. The ascii format for the Sensor data files can bee seen below.


The Sensor type part:

Select which to type of sensor to import new values:

  • Navigation
  • Tide
  • Velocity
  • Heave
  • Roll
  • Pitch

The Reverse sign check box can be set to change the sign in the input file.


The Adjust for different time zone part:

Use the input field to modify the time values with the number of hours to the correct time zone.
By default the command assumes that all time values are in the local time zone.


The Survey Line part:

Select which Multibeam Survey line(s) to import data to.

 

The ASCII input formats

Navigation

The ascii navigation import will detect data from files of three different formats:

  • An Ascii file containing the three columns Date/Time, easting and northing.
  • An Ascii file containing the four columns Date/Time, easting, northing and depth.
  • An Ascii file inTerraPos format.

Example, Ascii file with Date/Time, easting and northing:

YYYYmmddhhmmss easting northing
20100802121000 100000.3 200010.4
20100802121005 100001.2 200012.4
20100802121010 100003.1 200014.3

 

Sound Velocity

The sound velocity file should have the following two columns: depth in meters, and velocity in meters pr second.

Example:

depth velocity
0     1447.3
20    1448.4
40    1448.7
60    1449.3

 

Tide, Heave, Roll, Pitch and Gyro

These sensor data should have the following two columns: Date/time and sensorvalue. Tide and heave should have a sensor value in meters. The unit of roll pitch and gyro should be decimal degrees.

The seconds (ss) can have decimals.

Example:

YYYYmmddhhmmss value
20100802121000 0.20
20100802121100 0.31
20100802121200 0.44


It is also possible to have separated columns for date and time (NHS tide format). Then the date is specified with year at the end and the tidevalues are in centimeters.

Example:

ddmmYYYY hhmmss value
02082010 121000 20
02082010 121100 31
02082010 121200 44

Any delimiter (except space) can be used between the dd, mm and YYYY fields, and the hh, mm and ss fields.


The Heave, Roll, Pitch and Gyro values will be used as in the processing, while the tidevalue will be subtracted from the depth value for each depth soundings.

The tide correction will perfomed as: Corrected depth = Depth - Tidevalue