<div dir="ltr"><div>Hi,<br><br></div>I think the problem I have is that my Greenland bed elevation data doesn&#39;t have any lat lon information just like the data set you suggest ( <a href="http://land5.input.nc" target="_blank">land5.input.nc</a> ).<br><br><br>-----<br>    float lat(time, y1, x1) ;<br>        lat:grid_mapping = &quot;mapping&quot; ;<br>        lat:long_name = &quot;Latitude&quot; ;<br>        lat:standard_name = &quot;latitude&quot; ;<br>        lat:units = &quot;degreeN&quot; ;<br>    float lon(time, y1, x1) ;<br>        lon:grid_mapping = &quot;mapping&quot; ;<br>        lon:long_name = &quot;Longitude&quot; ;<br>        lon:standard_name = &quot;longitude&quot; ;<br>        lon:units = &quot;degreeE&quot; ;<br>-----<br><div><br></div><div>And my data set only has &quot;projection_x_coordinate(x)&quot; and &quot;projection_y_coordinate(y)&quot; information<br>----<br>    float projection_x_coordinate(x) ;<br>        projection_x_coordinate:units = &quot;kilometres&quot; ;<br>        projection_x_coordinate:standard_name = &quot;projection_x_coordinate&quot; ;<br>        projection_x_coordinate:long_name = &quot;x coordinate of projection&quot; ;<br>    float projection_y_coordinate(y) ;<br>        projection_y_coordinate:units = &quot;kilometres&quot; ;<br>        projection_y_coordinate:standard_name = &quot;projection_y_coordinate&quot; ;<br>        projection_y_coordinate:long_name = &quot;y coordinate of projection&quot; ;<br>    float BedrockElevation(y, x) ;<br>        BedrockElevation:units = &quot;metres&quot; ;<br>        BedrockElevation:grid_mapping = &quot;Polar-Stereographic&quot; ;<br>        BedrockElevation:coordinates = &quot;projection_x_coordinate projection_y_coordinate&quot; ;<br>        BedrockElevation:missing_value = &quot; -9999.&quot; ;<br>        BedrockElevation:standard_name = &quot;BedrockElevation&quot; ;<br>        BedrockElevation:long_name = &quot;Bedrock elevation with respect to the EIGEN-GL04C geoid for Greenland. Please discuss correct acknowledgement and referencing with J. Bamber before publishing any results using these data.&quot; ;<br>----<br><br><div><div class="gmail_extra">So my question is that is there anyway I can obtain real lat/lon information from &quot;projection_x_coordinate(x)&quot; and &quot;projection_y_coordinate(y)&quot; with NCL in order to regird that into T31 grid?<br><br></div><div class="gmail_extra">Thank you<br></div><div class="gmail_extra"><br><br><br><div class="gmail_quote">2015-04-06 19:22 GMT-04:00 Dennis Shea <span dir="ltr">&lt;<a href="mailto:shea@ucar.edu" target="_blank">shea@ucar.edu</a>&gt;</span>:<br><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><div><div><div><div>Not sure if the following are related to: <br>      &quot;... Greenland bed elevation data set ...&quot;<br></div><div><br>See: <a href="http://www.ncl.ucar.edu/Applications/ESMF.shtml" target="_blank">http://www.ncl.ucar.edu/Applications/ESMF.shtml</a><br></div><div>        Example 33<br><br></div>See: <a href="http://www.ncl.ucar.edu/Applications/ice.shtml" target="_blank">http://www.ncl.ucar.edu/Applications/ice.shtml</a><br></div>        gland section<br><br></div>The <a href="http://land5.input.nc" target="_blank">land5.input.nc</a> file is at<br><br></div><a href="http://www.cgd.ucar.edu/~shea/gland5.input.nc" target="_blank">www.cgd.ucar.edu/~shea/gland5.input.nc</a><br><br></div>HTH<br></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div class="h5">On Mon, Apr 6, 2015 at 3:11 PM, Tsai Judy <span dir="ltr">&lt;<a href="mailto:judytsaibuy@gmail.com" target="_blank">judytsaibuy@gmail.com</a>&gt;</span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div class="h5"><div dir="ltr"><div><div>Hi,<br><br></div>I have a Greenland bed elevation data set 
(.nc file) with polar stereographic grid and I want to re-grid that into
 CCSM T31 grid in order to calculate the difference between them. 
However, my Greenland bed elevation data set doesn&#39;t have the associated
 longitude and latitude information (i.e lon2d and lat2d) within the nc 
file. It just has &quot; projection_x_coordinate (x)&quot; and &quot; 
projection_y_coordinate (y).&quot; Can anyone suggest that is there any way 
(or function) available in NCL that I can use to deal with this issue? <br><br></div>Thanks</div>
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