Comparing Dual-Doppler Radar Analysis to WRF Output

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twhittock3
Posts: 1
Joined: Wed Jun 24, 2020 1:31 pm

Comparing Dual-Doppler Radar Analysis to WRF Output

Post by twhittock3 » Wed Jun 24, 2020 2:19 pm

Hello WRF community,

I have a dual-doppler radar analysis of the landfall of Hurricane Florence. It contains a grid of 200x175 points, and the X and Y coordinates are distances in meters from one of the two radar towers. The grid has a resolution of 1km, i.e. there is a radar observation recorded every 1000m. The radar analysis files are in netCDF format, and they do not contain latitude and longitude, so I am unsure how to plot it on a map with coastlines and state borders. The (X,Y) point (0,0) is the only known latitude and longitude (the same as one of the radar stations: 33.9892, -78.4291). I would like to use this radar analysis to help evaluate/validate 10m wind speeds that I get from a WRF run.

Here is my question/problem: Is there a way that I could convert a 200x175 grid of distances (dx,dy) reported from one reference latitude and longitude, into a grid of latitude and longitude points that I can then compare with my WRF output? Alternatively, is there a relatively easy way to convert WRF output into a grid of distances, in meters, from one reference latitude and longitude, that I can then use to compare with my radar analysis?

Thank you,
Ted

kwerner
Posts: 1635
Joined: Wed Feb 14, 2018 9:21 pm

Re: Comparing Dual-Doppler Radar Analysis to WRF Output

Post by kwerner » Fri Jun 26, 2020 7:40 pm

Hi Ted,
Unfortunately I'm not aware of any methods for doing this, but hopefully someone from the community will have some ideas.
NCAR/MMM

mgduda
Posts: 319
Joined: Mon Feb 26, 2018 7:35 pm

Re: Comparing Dual-Doppler Radar Analysis to WRF Output

Post by mgduda » Tue Jun 30, 2020 7:34 pm

I think knowing only the latitude and longitude of the (0,0) point, along with the fact that all points are spaced 1 km apart (along two orthogonal axes?) may not be enough information to determine the latitude and longitude of every point. For example, in the figures below, the points are at 1 km spacing and both grids have a corner point located at (0,0).
grid1.png
grid2.png
Do you know the orientation of the axes of the grid, or something else that would allow for an unambiguous description of the grid?
NCAR/MMM

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