Coordinate issue with --snapshots on ocean model grid

[Xiaoning-Wu]

When experimenting with NodeFileCompose on ocean model data, it seems that snap_lon and snap_lat are not registered correctly. This might have to do with some oddities of the ocean grid (in the x direction, longitude ranges from -200 to 160 instead of more conventional values; in the y direction, the grid is equatorially refined so is non-uniform). But the snapshots themselves and the composite look reasonable/tracked in the right position. Are there ways to register snap_lon and snap_lat from the track file instead of the data file, perhaps as one way to circumvent this issue? Thanks for any suggestions!