<div dir="ltr"><div><span id="result_box" class="" lang="en"><span class="">Hello.</span> <span class="">I have</span> <span class="">a layer of</span> <span class="">meteorological stations</span> <span class="">with</span> <span class="">temporal information</span> <span class="">in</span> <span class="">PostGIS</span><span>.</span> <span class="">Some of the</span> <span class="">stations have</span> <span class="">variables</span> <span class="">with null values</span><span>.</span> <span class="">In</span> <span class="">QGIS</span> <span class="">v2.3 (Ubuntu 13.10)</span><span>, null values</span> <span class="">are displayed</span> <span class="">correctly in</span> <span class="">the attribute table</span><span>.</span> <span class="">However,</span> <span class="">when displaying</span> <span class="">the label</span> <span class="">is treated as</span> <span class="">a value</span> <span class="">of 0</span><span class="">, similarly</span> <span class="">when I perform</span> <span class="">an operation</span> <span class="">interpolation</span> <span class="">(</span><span>IDW</span> <span class="">algorithm</span> <span class="">from the</span> <span class="">raster</span> <span class="">menu),</span> <span class="">where</span> <span class="">this result</span> <span class="">should ignore</span> <span class="">null values</span> <span class="">stations</span><span>.</span> <br>

<br><span class="">My question is</span><span>, is this</span> <span class="">a bug in</span> <span class="">QGIS</span><span>?</span><span>.</span><br><br><span class="">Attached</span> <span class="">a screenshot</span> <span class="">trying to</span> <span class="">explain the results of</span> <span class="">interpolation</span> <span class="">and labeled</span><span>,</span> <span class="">possibly wrong</span> <span class="">with</span> <span class="">null values.</span></span><br>

<br><a href="https://drive.google.com/file/d/0B9J3L0xnIeLZLWRtSkJLeXp1RzA">https://drive.google.com/file/d/0B9J3L0xnIeLZLWRtSkJLeXp1RzA</a><br><br></div>regards,<br><br>Samuel Mesa,<br clear="all"><div><div><br>-- <br>---<div>

    .~.<div>   / v \</div><div>  //    \\</div><div> /(      )\</div><div>   ^`~'^</div></div>
</div></div></div>