GrADS Function: oabin

## oabin()

`oabin (gexpr, sexpr <,-flag>)`

This function bins station observations into grid cells based on their location. If more than one station is located within a grid box, the observations are averaged together to produce the analyzed value.

`gexpr` a valid grid expression
`sexpr` a valid station data expression

The optional `flag` may be one of the following:

`-f` set the value to the first observation that gets binned
`-c` output is the # of stations located within each grid cell

### Usage Notes

1. The -f flag should be used when summing is not appropriate -- e.g. surface type classification.

2. See the related function `oacres`.

### Example

    open grd_var.ctl
    open stn_var.ctl

    set gxout grfill
    d oabin(grd_var.1,stn_var.2)

    set gxout grid
    d oabin(grd_var.1,stn_var.2,-c)