<div dir="ltr"><div class="gmail_default" style="font-size:small">One thing that can help determine if you have the parallels correct is by drawing the lat/lon grid of your data. If the lines are straight then this is a good sign that the map is projected properly. You can use gsn_coordinates to draw the lat/lon grid.</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">See example datagrid_8.ncl at:</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default"><a href="http://www.ncl.ucar.edu/Applications/datagrid.shtml#ex8">http://www.ncl.ucar.edu/Applications/datagrid.shtml#ex8</a><br></div><div class="gmail_default"><br></div><div class="gmail_default"><br></div><div class="gmail_default" style="font-size:small">--Mary</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Aug 21, 2017 at 2:26 PM, Rick Brownrigg <span dir="ltr"><<a href="mailto:brownrig@ucar.edu" target="_blank">brownrig@ucar.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div>Hi,<br><br></div>Its going to be difficult without knowing these values exactly. A reasonable guess on the central meridian might be the center of the area of interest, but again its just a guess. The parallels -- who knows? However, if you just pick values or let defaults apply, the worst that should happen is a distorted map. You might play around with values until things look aesthetic.<br><br></div><div>Rick<br></div></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div class="h5">On Mon, Aug 21, 2017 at 6:09 AM, 李雯雯 <span dir="ltr"><<a href="mailto:jodie_megan@icloud.com" target="_blank">jodie_megan@icloud.com</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5"><div><div><div>Hello !</div><div> I have a matrix which represents a certain quantity ,each point in the matrix has the corresponding latitude and longitude.The longitude of each column in the matrix is not necessarily equal,the latitude of each line is also not necessarily equal.The distance between any grid is 2 kilometers.I know the map projection is LambertConformal,but I do not know the <a href="mailto:res@mpLambertParallel2F" target="_blank">res@mpLambertParallel1F, res@mpLambertParallel2F</a>, <a href="mailto:res@mpLambertMeridianF" target="_blank">res@mpLambertMeridianF</a> .Is there any way to calculate the there values?</div><div>I appreciate your help.</div><div><br></div><div><div><div style="color:#000000;font-family:SFNSText,'Helvetica Neue',Helvetica,sans-serif;font-size:15px;font-style:normal;font-variant:normal;font-weight:300;letter-spacing:normal;line-height:21px;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:#ffffff">Cheers</div><div style="color:#000000;font-family:SFNSText,'Helvetica Neue',Helvetica,sans-serif;font-size:15px;font-style:normal;font-variant:normal;font-weight:300;letter-spacing:normal;line-height:21px;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:#ffffff">Sharon</div></div></div></div></div><br></div></div>______________________________<wbr>_________________<br>
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