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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Hi all.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">We’re working with a number of projects, which statically open a fixed number of layers. All layers are fetched using WFS / WFS-T.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Each layer has an extensive rule based styling, and an extensive field/attribute dialog setup. This is saved in the project file.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Our plugin changes the data provider filter for many layers, when the user works with the data. These filters are also saved in the project, of course.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Our problem is, that if the user accidently chooses a work area (= new data provider filter), which contain no data in any layer, those layers lose all styling
 etc. And it’s apparently impossible to recover these styles etc. by changing the filter back.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">So basically the user’s project is unrecoverably trashed at this point in time.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">A - Is this a correct description of how QGIS handles “no-data” layers ?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">B - Are there any standard ways to handle this in QGIS (using metadata or otherwise) in an automated fashion (i.e. not manually) ?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">C - If the answers to A and B are yes and no resp., are there any plans to remedy this serious problem ?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black;mso-fareast-language:DA">Med venlig hilsen</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:DA"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:11.9pt"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black;mso-fareast-language:DA">Lars I. Nielsen, LIFA A/S</span><span style="font-size:12.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DA"><br>
</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DA">GIS-konsulent, FME Certified Professional</span><span style="font-size:12.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DA"><br>
<br>
</span><span style="font-size:12.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DA"><img width="284" height="82" id="_x0000_i1026" src="cid:image001.gif@01D50591.E4716090" alt="Beskrivelse: C:\Users\lin\AppData\Roaming\Microsoft\signatures\284x82-Images-Get-L749-l3.gif"></span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:DA"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:red;mso-fareast-language:DA">T</span></b><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:DA"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DA">6313 6800</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:DA"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:red;mso-fareast-language:DA">@</span></b><span style="font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DA"> </span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:DA"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DA">lin@lifa.dk</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:DA"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:red;mso-fareast-language:DA">D</span></b><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:DA"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DA">6313 6849</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:DA"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:red;mso-fareast-language:DA">W</span></b><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:DA"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DA"><a href="http://www.lifa.dk"><span style="color:blue">www.lifa.dk</span></a> </span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:DA"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:red;mso-fareast-language:DA">M</span></b><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:DA"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DA">2492 4866</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:DA"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:red;mso-fareast-language:DA">CVR</span></b><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:DA"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DA">20937289</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:DA"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:DA"><br>
</span><b><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:red;mso-fareast-language:DA">Vi tilbyder interne og eksterne kurser. Du kan finde mere information i vores
</span></b><b><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black;mso-fareast-language:DA"><a href="https://www.lifa.dk/kursuskalender" target="_new" title="LIFA kurser"><span style="color:blue">kursuskalender</span></a></span></b><span style="font-size:12.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DA"><br>
<br>
</span><a href="https://www.linkedin.com/company/lifa-a-s/"><span style="font-size:12.0pt;font-family:"Arial","sans-serif";color:blue;mso-fareast-language:DA;text-decoration:none"><img border="0" width="21" height="21" id="_x0000_i1025" src="cid:image002.png@01D50591.E4716090" alt="Beskrivelse: C:\Users\lin\AppData\Roaming\Microsoft\signatures\21x21-Images-Get-L749-l8.png"></span></a><span style="font-size:12.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DA"><br>
</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DA">Følg os på LinkedIn og læs de seneste nyheder fra LIFA A/S</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:DA"><br>
<br>
</span><o:p></o:p></p>
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