<div dir="ltr">Dear ncl-talk,<div><br></div><div>I have a question about calculating a metric. I am trying to calculate the S1 skill score (<a href="http://www.cawcr.gov.au/projects/verification/">http://www.cawcr.gov.au/projects/verification/</a>), which uses differences between forecast and observed adjacent points. I will be using centered finite differences for this and came across the example 6 here (<a href="https://www.ncl.ucar.edu/Document/Functions/Built-in/center_finite_diff_n.shtml">https://www.ncl.ucar.edu/Document/Functions/Built-in/center_finite_diff_n.shtml</a>) which calculates dx at each latitude. My question would be, would I also loop over longitude to get dy or would this be included in the calculation already? I would calculate the S1 skill score over a global grid of 181x360 grid points in lat/lon.</div><div><br></div><div>Thanks,<br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div>Andrew Kren, PhD<br>
Research Scientist I, Global Observing Systems Analysis (GOSA) Group<br>
NOAA ESRL Global Systems Division (Rm 3C515)<br>
325 Broadway, Boulder, CO 80305<br>
<a href="tel:%28303%29%20497-5418" value="+13034975847" target="_blank">(303) 497-5418</a><span><font color="#888888"><br>
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