<div dir="ltr">Use the function <b>getind_latlon2d</b> to get the (i,j) grid point indices for the point data coordinates. Then do a single loop over the point data to accumulate sums and counts on the output grid.<div><br><div dir="ltr"><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Oct 18, 2020 at 9:09 AM Paimazumder, Debasish via ncl-talk <<a href="mailto:ncl-talk@mailman.ucar.edu">ncl-talk@mailman.ucar.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex">
<div dir="auto">
Hi Barry,
<div>Thanks for your response. Actually I don’t have time dimension. I have location level data (at high resolution).</div>
<div>For example, x(m) with lat(m) and lon (m) where m = 300k location </div>
<div><br>
</div>
<div>My output grid is 32x32 km and I would like to do following </div>
<div>1. Estimate the number of locations are in each 32x32 km grid</div>
<div>2. Accumulate (sum) the x at each output grid.</div>
<div>For example- if I have 100 locations at one of the 32x32km grid, I will sum all x from 100 locations and assign the sum to the output grid.<br>
<br>
<div dir="ltr">Best regards,
<div>Dave</div>
</div>
<div dir="ltr"><br>
<blockquote type="cite">On Oct 18, 2020, at 3:50 AM, Barry Lynn <<a href="mailto:barry.h.lynn@gmail.com" target="_blank">barry.h.lynn@gmail.com</a>> wrote:<br></blockquote></div><blockquote type="cite"><div dir="ltr">
<div dir="ltr">Hi:
<div><br>
</div>
<div>If you have two grids of the same dimensions, but different times, you can simply add them together.</div>
<div><br>
</div>
<div>If you have grids of a different size, you can interpolate the data to this grid, one grid at a time.</div>
<div><br>
</div>
<div>See for example:</div>
<div><br>
</div>
<div><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__www.ncl.ucar.edu_Applications_regrid.shtml&d=DwMFaQ&c=kn4_INW_mBCDHV_xJEVJkg&r=fpudUXThXLQwAKQPDCnmVaSzm2dwE9OxcWi7MuJ0jbo&m=IaFm8AuXStzIPZXMbIRmp6fjt5zy74eAUUQzoQb5pBc&s=tUIMDu-yehcnE2-mHTaX2NhZiAg5eBHJsqf3e1Bmbl8&e=" target="_blank">https://www.ncl.ucar.edu/Applications/regrid.shtml</a><br>
</div>
<div><br>
</div>
<div>This may also help.</div>
<div><br>
</div>
<div><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__www.ncl.ucar.edu_Document_Functions_Built-2Din_dim-5Fsum-5Fn.shtml&d=DwMFaQ&c=kn4_INW_mBCDHV_xJEVJkg&r=fpudUXThXLQwAKQPDCnmVaSzm2dwE9OxcWi7MuJ0jbo&m=IaFm8AuXStzIPZXMbIRmp6fjt5zy74eAUUQzoQb5pBc&s=4tdKFBxFBOUpMYFj95WyO8MUdUcYRniTWsJIvCCbhAE&e=" target="_blank">https://www.ncl.ucar.edu/Document/Functions/Built-in/dim_sum_n.shtml</a><br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, Oct 18, 2020 at 7:59 AM Paimazumder, Debasish via ncl-talk <<a href="mailto:ncl-talk@mailman.ucar.edu" target="_blank">ncl-talk@mailman.ucar.edu</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex">
<div lang="EN-US">
<div>
<p class="MsoNormal">Hi NCL users<u></u><u></u></p>
<p class="MsoNormal">I have location level data and 2d lat, lon grid and I’m trying to accumulate the data on 2d lat, lon grid.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">For example <u></u><u></u></p>
<p class="MsoNormal">Input - x (n) with lat(n), lon(n)<u></u><u></u></p>
<p class="MsoNormal">Output grid - lat(i)xlon(j)<u></u><u></u></p>
<p class="MsoNormal">I’m trying to estimate number of location within each grid and accumulate x at each grid.
<u></u><u></u></p>
<p class="MsoNormal">Is there any function in NCL that will solve this problem?<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">With regards<u></u><u></u></p>
<p class="MsoNormal">-Debasish <u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><b><span style="font-size:12pt;color:rgb(0,176,240)">Debasish PaiMazumder, PhD |</span></b><span style="font-size:12pt;color:rgb(102,102,102)">Tel
<a href="tel:%2B1%20215%20255%206371" target="_blank"><span style="color:blue">+1 215 255 6052</span></a> | Cell
<a href="tel:%2B1%20718%20913%206946" target="_blank"><span style="color:blue">+1 267 449 5226</span></a> |</span><u><span style="font-size:12pt;color:blue"><a href="mailto:Debasish.Paimazumder@aig.com" target="_blank">Debasish.Paimazumder@aig.com</a></span></u></p></div></div></blockquote></div></div></blockquote></div></div></blockquote></div></div></div></div>