Skip to content

How to Flip Transects

Available Scripts:

1.transects_swap_points.py

  • A script that reads a config_gdf.geojson and swaps the origin & end point for each transect.
  • The new transects (default name : reversed_transects.geojson ) are saved to the scripts directory

2.shorten_transects.py

  • A script that reads a geojson file containing transects and can shorten or length each transect depending on the parameters used
  • The new transects (default name : shortened_transects.geojson ) are saved to the scripts directory

Prerequisites for running the script

1. Open Anaconda Prompt

  • Navigate to the Start menu or application directory and open the Anaconda Prompt.

2. Navigate to the Scripts Directory

  • Replace path_to_your_directory with the location where the coastseg directory is located on your machine.
1
2
cd path_to_your_directory\coastseg
cd scripts

Run the Script transects_swap_points.py

  • This will swap each transect's origin and end point
1
python script_name.py [options]

1. Example: Use config_gdf.geojson To run the script named transects_swap_points.py, you can execute:

1
python transects_swap_points.py -i 'C:\path_to_directory\CoastSeg\sessions\ID_rmh16_datetime08-22-23__12_49_23\config_gdf.geojson'

2. Example: Use transects.geojson

1
python transects_swap_points.py -i 'C:\path_to_directory\CoastSeg\transects.geojson'

Run the Script shorten_transects.py

Example 1: Shorten the transects by 500m

  • -s shorten the length of the transect by 500 meters by moving the origin seaward
1
python shorten_transects.py  -i "C:\development\doodleverse\coastseg\CoastSeg\reversed_transects.geojson" -s 500

Example 2: Shorten the transects by 500m from the origin and lengthen by 100m from the seaward point

  • -s shorten the length of the transect by 500 meters by moving the origin towards the end point

  • -l lengthen the length of the transect by 100 meters by moving the end point more seaward

1
python shorten_transects.py -i "C:\development\doodleverse\coastseg\CoastSeg\reversed_transects.geojson" -s  500 -l 100

Example 3: Shorten the transects by 500m from the origin and lengthen by 100m from the seaward point and save to shortened_transects2.geojson

  • -s shorten the length of the transect by 500 meters by moving the origin towards the end point

  • -l lengthen the length of the transect by 100 meters by moving the end point more seaward

  • -o save the new transects to file "shortened_transects2.geojson"

1
python shorten_transects.py -i "C:\development\doodleverse\coastseg\CoastSeg\reversed_transects.geojson" -s  500 -l 100 -o "shortened_transects2.geojson"

Getting Help

For most scripts, you can get a description of the available options and how to use them by using the -h or --help flag:

1
python script_name.py -h

Or:

1
python script_name.py --help

You can also open the script in any text editor or IDE like Notepad++, VSCode, or similar to view the documentation.