@taylor13 

Maybe this figures shows clearer what I mean?

![coordinates_lonlat2](https://user-images.githubusercontent.com/29165465/76023046-af252880-5f28-11ea-9905-18db086b7cda.png)

lon1, lon2, ... actually mean lon_bnd1, lon_bnds2, ... .

For my example I assume that we have some grid, which is not orientated along 
the lon and lat axis. The grid is somehow curved. I tried to include an i-axis 
into the plot from above (i_{n-1}, i_{n}, i_{n+1} are the i-values):

![coordinates_lonlat3](https://user-images.githubusercontent.com/29165465/76023783-23ac9700-5f2a-11ea-8480-c0ebe266b474.png)

I could draw the i and j indices into a plot with regular i and j axes. 
However, we could not reasonably include the lon-lat-information there. It 
would look like this:

![coordinates_ij2](https://user-images.githubusercontent.com/29165465/76023395-66ba3a80-5f29-11ea-8218-e98aa501ccca.png)


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