USGS MIPS Xtfin Documentation

USGS MIPS Xtfin Documentation

This program converts an eXtended Triton Format (XTF) file into USGS MIPS image and navigation files. XTF files are usually created by the Triton Isis collection system. The program can read the following data types from an XTF file:

Unsigned 8-bit
Signed 16-bit

Files

This program requires as input one XTF file. The output image file contains the sonar ping data and the output navigation file contains the associated navigation information which includes date, time, latitude, longitude, slant range and fish attitude.

The following labels are created for the output file:

Image
Sonar
Navigation

Channel options

LCHAN and RCHAN

The left channel (lchan) and right channel (rchan) parameters are used to identify which channel from the XTF file is placed on the left side of the image and which is placed on the right side of the image. The range of valid channels depends on the number of channels recorded in the XTF file.

LCHAN defaults to channel number 2 and RCHAN defaults to channel number 1. The default values cause the image to be flipped from left to right, so when the sonar strip is viewed using VISTA the port channel appears on the right side of the image and the starboard appears on the left. This flipped image is necessary for MIPS sonar programs which deal with geometry corrections such as SLR2GR and SNRGEOM.

First PARAMS prompt command line example:

PARAMS> LCHAN=4,RCHAN=3

Ping rate options

RATE1, RATE2, RATE3...

XTF files may contain pings which are collected at different pulse rates. The MIPS sonar processing programs do not allow more than one pulse rate per file. Therefore, the XTFIN program allows the user to specify which pulse rate the MIPS file will contain. All pings in the XTF file which do not match the chosen pulse rate will not be transferred to the MIPS image or navigation files. Information about the first 25 different pulse rates in an XTF file will be displayed on the second params prompt. These will be parameters RATE1 through RATE25. The description of each RATE parameter will contain the pulse rate and the number of times that rate appeared in the XTF file.

Second PARAMS prompt command line example:

PARAMS> RATE2