[Met_help] (no subject)

[John Halley Gotway]

Michael,

Yes, that's basically correct.  The main difference between Point-Stat and Grid-Stat is that Point-Stat is set up to handle point observations while Grid-Stat handles gridded observations.  Beyond
that, they basically do the same thing: collect a bunch of fcst-obs matched pairs over a user-defined region and compute a variety of statistics from those sets of matched pairs.  Both Point-Stat and
Grid-Stat are designed to be run once for each forecast valid time.

I see that you're more interested in looking at performance through time at one or more individual points.  And while MET wasn't optimized to solve that problem, there are ways to compute that.  You
could run Point-Stat at each forecast valid time with the sole purpose of producing matched pairs at a set of observation locations.  And then you could use the Stat-Analysis tool to read those
matched pairs through time for each observation location and compute any number of statistics.  In order to do this, in the Point-Stat configuration file, you'd use the "mask_sid" (for station id) to
provide a list of the stations in which you're interested.  And you'd set the "output_flag" parameter to only dump out the matched pair (MPR) line type.  Then you'd run Stat-Analysis to read in those
MPR lines for each station, and recompute stats through time.

I do know of at least one other users who's doing exactly that.

Hope that helps clarify.

Thanks,
John

Shaw, Michael J CTR USAF AFWA 16 WS/WXE wrote:
> Hi John.
> 
> Just getting back to some of this...and still wondering - point_stat isn't really for a point, it's for a set of points (i.e., a single point wouldn't be able to generate any statistics...with a sample size of 1 and all), right?  So, the stat analysis part of MET is to then organize, say, rows (so a timeseries if the rows are for different times) of point_stat stats (which could only be done for a SET of points) and compute stats on those stats, right??
> 
> I.e., there's no way of doing a single station/gridpoint pair timeseries statistical analysis with MET??
> 
> Thanks,
> Mike
> 
> ______________________________________________
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> Michael Shaw, Contractor
> SAIC/NASA Support Scientist
> michael.shaw.ctr at offutt.af.mil
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