<div dir="ltr"><div></div><div><a href="http://www.ncl.ucar.edu/Document/Functions/Built-in/rcm2points.shtml" target="_blank"><b>rcm2points</b></a><b>          NOTE: this may be slow</b><br></div><div><br></div><div>I believe HGT [HGT_M] is *model* orography. Not 'real world' orography.</div><div><br></div><div>Unless the real world terrain is smoothly varying, Interpolating to "actual station height ", regardless of method [nearest neighbor, bilinear], will have issues.<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Dec 10, 2020 at 7:22 AM ali mughal 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:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr"><div style="margin:0px;padding:0px;border:0px none;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;font-size:12pt;line-height:inherit;font-family:Calibri,Arial,Helvetica,sans-serif;vertical-align:baseline;color:rgb(0,0,0)">Dear NCL users </div><div style="margin:0px;padding:0px;border:0px none;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;font-size:12pt;line-height:inherit;font-family:Calibri,Arial,Helvetica,sans-serif;vertical-align:baseline;color:rgb(0,0,0)"><br></div><div style="margin:0px;padding:0px;border:0px none;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;font-size:12pt;line-height:inherit;font-family:Calibri,Arial,Helvetica,sans-serif;vertical-align:baseline;color:rgb(0,0,0)">The attached script provides the HGT above the ground for some stations. Though the script works fine and the required output is obtained. However, due to the nearest grid approach some heights are wrongly represented when comparing with the actual station height data.  Is there a bilinear interpolation function available in NCL that can interpolate the height using the 4 neighbours. </div><div style="margin:0px;padding:0px;border:0px none;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;font-size:12pt;line-height:inherit;font-family:Calibri,Arial,Helvetica,sans-serif;vertical-align:baseline;color:rgb(0,0,0)"><br></div><div style="margin:0px;padding:0px;border:0px none;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;font-size:12pt;line-height:inherit;font-family:Calibri,Arial,Helvetica,sans-serif;vertical-align:baseline;color:rgb(0,0,0)">I will be grateful for help</div><div style="margin:0px;padding:0px;border:0px none;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;font-size:12pt;line-height:inherit;font-family:Calibri,Arial,Helvetica,sans-serif;vertical-align:baseline;color:rgb(0,0,0)"><br></div><div style="margin:0px;padding:0px;border:0px none;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;font-size:12pt;line-height:inherit;font-family:Calibri,Arial,Helvetica,sans-serif;vertical-align:baseline;color:rgb(0,0,0)"><br></div><div style="margin:0px;padding:0px;border:0px none;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;font-size:14px;line-height:inherit;vertical-align:baseline;color:rgb(0,0,0)"><div id="gmail-m_-5956009106975753980gmail-m_-3591218785565595227gmail-m_2822876177741096015gmail-Signature" style="margin:0px;padding:0px;border:0px none;font:inherit;vertical-align:baseline;color:inherit"><div style="margin:0px;padding:0px;border:0px none;font:inherit;vertical-align:baseline;color:inherit"><div id="gmail-m_-5956009106975753980gmail-m_-3591218785565595227gmail-m_2822876177741096015gmail-divtagdefaultwrapper" style="margin:0px;padding:0px;border:0px none;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;font-size:12pt;line-height:inherit;font-family:Calibri,Arial,Helvetica,sans-serif;vertical-align:baseline"><div style="margin:0px;padding:0px;border:0px none;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;font-size:13px;line-height:inherit;font-family:Tahoma;vertical-align:baseline;color:inherit"><div style="margin:0px;padding:0px;border:0px none;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;line-height:inherit;vertical-align:baseline;color:inherit"><br></div><div style="margin:0px;padding:0px;border:0px none;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;font-size:15.4545px;line-height:inherit;font-family:wf_segoe-ui_normal,"Segoe UI","Segoe WP",Tahoma,Arial,sans-serif;vertical-align:baseline;color:rgb(33,33,33)"><font size="3" face="Times New Roman,serif"><span style="margin:0px;padding:0px;border:0px none;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;font-size:12pt;line-height:inherit;font-family:inherit;vertical-align:basel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