#name: SonarCoverage.py #created: May 2016 #by: [email protected] #description: This script will compute a nadir gap outline around a trackplot from the Deeptow sonar in an efficient manner

It will use an algorithm as agreed between Fugro and ATSB on the definition of the altitude/gap region

#notes: See main at end of script for example how to use this #based on XTF version 26 18/12/2008 #version 1.00

#DONE

tried to update teh readme file

added -odix to control the output folder

create a WGS84 prj file. Good for ArcMap, but not always correct if we have an east/north XTF FileExistsError

added support for xtf wildcards

added support for splitting polygons based on minimum gap width

added support for -o output file name, or default, which is the first input file to be processed. This means for processing 1 file you do not need to specify the output.

This script will compute a nadir gap outline around a trackplot from the Deeptow sonar in an efficient manner

designed to handle both geographic and grid positions seamlessly

creates a shapefile of points representing nadir sensor position

creates a coverage polygon representing the slant range setting of the sonar

creates a nadir gap polygon representing the null area under the sidescan which is poor quality data.

uses the sensor position, altitude and heading rather than computing CMG heading which is a bit wobbly when navigation data has duplicate points

initial implementation