[Met_help] adding a new data source

[John Halley Gotway]

Joe,

In METv2.0, Point-Stat is not set up to perform verification at 20, 40, and 60 m AGL.  Instead it performs verification either at the surface (i.e. 2-m temp, 10-m winds) or at pressure levels.  The
matching in the vertical is rather simplistic...
- Any observations with a message type of ADPSFC or SFCSHP are considered to be at the surface.
- When verifying upper air forecasts, we interpolate the forecast values above and below the observation to the observation pressure level, doing so linear in the log of pressure.

We've made some minor changes in the logic to the development version of MET to enable him to verify forecasts of soil temperature below ground.  And those changes might do the trick for you as well.
 But I'm guessing it'd need some tweaking.

I'd need to get more detail from you about what sort of logic you'd need.  Here are some questions off the top of my head:
- When verifying winds at say 20 m AGL, do you want to match to observations that are exactly 20 m AGL, or do you need to match to a range... like 18 to 22?
- The contents of the point observation information is described here: http://www.dtcenter.org/met/users/support/online_tutorial/METv2.0/ascii2nc/index.php
  We store the "Elevation" of the observing location in terms of MSL, and we store the "Height" of the observation in terms of MSL.  Does it make sense to compute the AGL for the observation as
"Height" minus "Elevation"?
- Do you want be able to do any sort of vertical interpolation down to the observation level?  For example, if you have an observation at 30 m AGL, would you like to interpolate the forecasts at 20
and 40 to the observation location?  That'd be more work.

Could you send me a sample forecast file containing forecasts at 20, 40, and 60 m AGL?  And could you send me some sample observation wind tower data?  I'm curious to see the format of it.

Thanks,
John


Joe Olson wrote:
> Hi,
> 
> I'd like to verify WRF simulations with some wind tower data I have  
> collected. Is there any documentation I missed that may help? As a  
> start, I would like to use pointstat to verify the winds &  
> temperatures @ 20, 40, and 60 m AGL. I can transform the wind tower  
> data to netcdf (after I learn the exact format) myself. But what I  
> could really use help on is which files I should focus on modifying in  
> order to ingest this data.  Any pointers would be greatly appreciated.
> 
> Thanks,
> Joe Olson
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