Frequently Asked Questions

LITPACK

Please do not hesitate to e-mail us if you have questions and/or answers yourself: mike@dhigroup.com.


 

    Entered: 2012-11-1
  • Question:

    General: How do I convert a ’classic’ LITLINE setup to work with Littoral Processes FM?


    Answer:

    Where the ‘classic’ LITLINE model setup was relating the position of structures, wave climates and profiles to a grid position on the baseline, grid point ‘i’, the new Littoral Processes FM module relates positions to an actual  coordinate (x,y) in a given projected coordinate system. This model will then internally associate a given location with the correct grid point on the baseline. (The derived grid point number will be written to the log-file).

    There is no automatic conversion of an existing ‘classic’ LITLINE setup to a setup in Littoral Processes FM, - you have to specify the input manually. If you have an existing LITLINE setup you can use the given grid coordinates to calculate the corresponding map coordinates by the description in the following.

    The coastline is described by the baseline defined by origin (x0,y0), the coastline orientation α0 and the grid spacing ΔX.

    The position of (x,y) in the ‘classic LITLINE’ is described by the grid position ‘i’ and the distance of the point to the baseline, L.

      

    350.png

    The coordinate (x,y) is thus found by the following equation

     350_2.png

    Please note that for Coastline Evolution, the cross-sections will be associated with the nearest grid point on the baseline. I.e. if the location is projected outside the extension of the baseline the cross-section will be associated with the first or last grid point.