Is it possible to use the module particle tracking with a spherical grid?
In principle yes, that is possible. The one thing I do not know by
heart is whether the grid distances and surface areas are converted
correctly to meters and square meters instead of degrees and square
degrees. Unfortunately I have no time today to dive into that, but the
crucial point would be to see what the grid coordinates are if you
view the grid via the LGA/CCO files, as that is where Delft3D-PART
gets its geometrical information from.
You can visualise the grid in these files via QuickPlot. Check the
range, that ought to indicate whether the grid contains the
coordinates in meters or degrees.
Another thing though: the use of spherical coordinates suggests that
your model covers a substantial area. You may need to use a large
number of particles (in the order of millions) to cover that area with
If I open lga/cco files the x and y coordinates show lon/lat values.
I compiled Delft3D tag 7545 on linux with gfortran. When I launch
Deft3D-PART I get the following message:
WARNING: Your x-coordinates are in the range [-180,180] and
your y-coordinates are in the range [-90,90]. You
might have a spherical grid. This is not yet
supported by PART.
I imagine that I must convert my spherical grid in a cartesian one.
I was unaware that Delft3D-PART actually checks for that :). Yes,
like I said the problem is that it derives its geometry directly from
the LGA/CCO file and as long as that is given in meters, all should
work. Converting the model to a cartesian one will get around this.