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You just need to use the lterp() function to regrid one of those variables to the other’s grid. For example,
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<div>ga-> display w105-lterp(k1,w105)</div>
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<div>—Jennfier</div>
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<div>On Apr 18, 2017, at 3:12 AM, ugo okoro <<a href="mailto:uknac23@yahoo.com">uknac23@yahoo.com</a>> wrote:</div>
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<div id="yui_3_16_0_ym19_1_1492408494242_79865"><span id="yui_3_16_0_ym19_1_1492408494242_79866">Dear All,</span></div>
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<div id="yui_3_16_0_ym19_1_1492408494242_79869"><span id="yui_3_16_0_ym19_1_1492408494242_79870">A better description of my problem is,</span></div>
<div dir="ltr" id="yui_3_16_0_ym19_1_1492408494242_79871"><span id="yui_3_16_0_ym19_1_1492408494242_79872">I want to the difference between a model ppt output and observation data with different resolutions. The model has data over the both land and ocean whereas
the observation has land only. But I only need the difference over land. I have regridded the model output
<b id="yui_3_16_0_ym19_1_1492408494242_79975">successfully</b> but find it very difficult to get the difference between the two as this is my error message:</span></div>
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<div dir="ltr" id="yui_3_16_0_ym19_1_1492408494242_79875">Error in gagchk: axis sizes are not the same</div>
<div dir="ltr" id="yui_3_16_0_ym19_1_1492408494242_79876">Operation error: Incompatable grids</div>
<div dir="ltr" id="yui_3_16_0_ym19_1_1492408494242_79877"> Error ocurred at column 8</div>
<div dir="ltr" id="yui_3_16_0_ym19_1_1492408494242_79878">DISPLAY error: Invalid expression</div>
<div dir="ltr" id="yui_3_16_0_ym19_1_1492408494242_79879"></div>
<div dir="ltr" id="yui_3_16_0_ym19_1_1492408494242_79880"> Expression = w105-k1</div>
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<div dir="ltr" id="yui_3_16_0_ym19_1_1492408494242_79883">Thanks.</div>
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<div dir="ltr" id="yui_3_16_0_ym19_1_1492408494242_79888"><font size="2" id="yui_3_16_0_ym19_1_1492408494242_79889">Ugo Okoro</font></div>
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<div style="font-size: 12px; orphans: 2; widows: 2;">Jennifer Miletta Adams<br>
Center for Ocean-Land-Atmosphere Studies (COLA)<br>
George Mason University<br>
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