On Wed, Apr 20, 2011 at 5:02 PM, Huddleston, John <span dir="ltr"><<a href="mailto:Huddleston@cira.colostate.edu">Huddleston@cira.colostate.edu</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal">Hi</p><p class="MsoNormal"> </p><p class="MsoNormal">Attached are two images of the same data, one is a close up view and one is a view from space.</p>
<p class="MsoNormal"> </p><p class="MsoNormal">The grid was made by taking the Lambert Conformal Conic grid in meters and projecting it to Mercator for display in Google earth.</p><p class="MsoNormal"> </p><p class="MsoNormal">
The sample data set was plotted with GrADS using PDEF to transform it again for display in Google earth.</p><p class="MsoNormal"> </p><p class="MsoNormal">The view from space looks correct.</p><p class="MsoNormal"> </p><p class="MsoNormal">
The close up view shows the GrADS grid cells vertically up and down and they do not match the LCC grid.</p><p class="MsoNormal"> </p><p class="MsoNormal">Is this the correct behavior for the plot?</p><p class="MsoNormal">
</p></div></div></blockquote><div><br></div><div>I know that real cartographers uses an oblate model of the earth surface (with 2 radius) to improve accuracy at regional scales, while grads uses a spherical model with a single radius. Could you be reaching this limit where the oblateness effects are important?</div>
<div><br></div><div> Arlindo</div><div> </div><div><br></div><div><br></div><div><br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div lang="EN-US" link="blue" vlink="purple">
<div><font color="#888888"><p class="MsoNormal">John Huddleston </p></font></div></div><br>_______________________________________________<br>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Arlindo da Silva<br><a href="mailto:dasilva@alum.mit.edu">dasilva@alum.mit.edu</a><br>