<div dir="ltr"><div class="gmail_default" style="font-size:small;display:inline">Hi </div>Yi Lu,<br><br>We have a examples page on subsetting data based on lat/lon. See:<br><br><a href="http://www.ncl.ucar.edu/Applications/latlon_subset.shtml">http://www.ncl.ucar.edu/Applications/latlon_subset.shtml</a><br><br>I believe TRMM data is represented by two-dimensional lat/lon arrays, is that correct? If so, then the "latlon_subset_2.ncl" example is the one you want to look at. The function it uses is getind_latlon2d:<br><br><a href="http://www.ncl.ucar.edu/Document/Functions/Contributed/getind_latlon2d.shtml">http://www.ncl.ucar.edu/Document/Functions/Contributed/getind_latlon2d.shtml</a><br><br>--Mary<div class="gmail_default"><br></div><div class="gmail_default"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Mar 14, 2017 at 8:26 AM, 易路 <span dir="ltr"><<a href="mailto:dg1225033@smail.nju.edu.cn" target="_blank">dg1225033@smail.nju.edu.cn</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>Hi, all</div><div> I planned to extract some grid values of TRMM according to a series of specified point locations (defined by their latitudes and longitudes), but I don't know which function I could use, are there any functions in NCL like wrf_user_ll_to_ij() and wrf_user_ij_to_ll() to obtain the grid numbers of TRMM according to the latitude and longitude information?</div><div> Thanks very much for your attentions and precious time!</div><div> </div><div>Best wishes!</div><div> </div><div>Yi Lu</div><div><u></u><div style="color:rgb(144,144,144);font-family:Arial Narrow;font-size:12px"><br><br><br><br></div><div style="color:rgb(0,0,0);font-family:Verdana;font-size:14px"><div style="overflow:hidden"><table class="m_-4797716102570359145preview_table"><tbody><tr><td valign="middle"><img id="m_-4797716102570359145preview_qrcode" src="https://exmail.qq.com/cgi-bin/setting_qrcode_card?action=qrcode_card&alias=dg1225033@smail.nju.edu.cn&key=33b1e5708e6a55b5"></td><td valign="middle" style="color:rgb(160,160,160);font-size:12px"><h4 class="m_-4797716102570359145name" style="margin:0px;color:rgb(0,0,0);line-height:28px;font-size:14px;font-weight:bold">易路</h4><p class="m_-4797716102570359145department" style="margin:0px">南大邮件系统/学生/博士生/12级博士生</p><p class="m_-4797716102570359145addr" style="margin:0px;color:rgb(160,160,160);line-height:22px">南京市汉口路22号 </p></td></tr></tbody></table></div></div><u></u></div><div> </div><div><u></u><u></u></div><br>______________________________<wbr>_________________<br>
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