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<p class="MsoNormal" style="margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span>Can anyone help with the syntax to calculate HAG (height above ground) relative
to an interpolated surface (following James McClain’s contribution, <a href="https://github.com/PDAL/PDAL/pull/2520" style="color:rgb(5,99,193);text-decoration:underline">#2520</a>)?<span></span></span></p>

<p class="MsoNormal" style="margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span><span><br></span></span></p>

<p class="MsoNormal" style="margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span>I’ve tried:<span></span></span></p>

<p class="MsoNormal" style="margin:0cm 0cm 8pt 80px;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span>{<span></span></span></p><div style="margin-left:80px">

</div><p class="MsoNormal" style="margin:0cm 0cm 8pt 80px;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span><span>    </span>"type":
"filters.hag",<span></span></span></p><div style="margin-left:80px">

</div><p class="MsoNormal" style="margin:0cm 0cm 8pt 80px;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span><span>    </span>"delaunay": True<span></span></span></p><div style="margin-left:80px">

</div><p class="MsoNormal" style="margin:0cm 0cm 8pt 80px;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span>},<span></span></span></p>

<p class="MsoNormal" style="margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span><span> </span></span></p>

<p class="MsoNormal" style="margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span>But the output HAG is clearly still being computed
relative to the nearest neighbour, rather than an interpolated surface as desired.  I’ve tried <b>"delaunay_fan": True</b>, and also including <b>“count”:
4</b> arguments, and have been looking through GitHub (which led me to “delauney”
rather "delaunay_fan") but still haven’t succeeded. <br></span></p><p class="MsoNormal" style="margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span><br></span></p><p class="MsoNormal" style="margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span>What am I missing?</span></p><p class="MsoNormal" style="margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><br></p><p class="MsoNormal" style="margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif">Thanks,</p><p class="MsoNormal" style="margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"> Andy<br></p><p class="MsoNormal" style="margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:"Calibri",sans-serif"><span><span></span></span></p>





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