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Strange coordinates of mass points of the parent grid

PostPosted: Wed Nov 22, 2017 5:47 am
by dvwrf

I am running ARW with a coarse grid and 1 nested grid. The grid ratio is 5. I extracted the coordinates of the mass points from the output files (variables XLONG and XLAT). The following image shows the position of the mass points of the 2 grids : In blue the points of the parent grid, in red the points of the child grid. I notice a strange offset of most points of the parent grid which are contained in the child grid.
Does anyone have an explanation for this observation?

Thank you very much.