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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">Hi Aaron,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">Well, the bad news is that this is on the trickier end of the GIS spectrum.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">It depends on the exact nature of the conversion you want to perform when changing to polygon.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"><a href="http://gis.stackexchange.com/questions/23203/how-to-calculate-raster-statistics-for-polygons">http://gis.stackexchange.com/questions/23203/how-to-calculate-raster-statistics-for-polygons</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">http://www.qgistutorials.com/en/docs/sampling_raster_data.html<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">Should hopefully get you started though.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">Jonathan<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> qgis-user-bounces@lists.osgeo.org [mailto:qgis-user-bounces@lists.osgeo.org]
<b>On Behalf Of </b>Aaron Stoler<br>
<b>Sent:</b> Monday, February 23, 2015 8:42 PM<br>
<b>To:</b> qgis-user@lists.osgeo.org<br>
<b>Subject:</b> [Qgis-user] pixel counts<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi all,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I am brand new to QGIS and have pretty minimal GIS experience, so I apologize for my crude terminology. I was recently handed a large number of ARCInfo files (adf) containing information on species abundance at 30 m2 resolution. Each file
(well...group of files since they are adf files) describes the abundance of a single species. I would like to analyze single species density within a custom-defined polygon. Species abundance within a 30 m2 is defined by color intensity (black = 0 abundance,
white = max abundance).<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I have figured out how to view single adf files as raster layers in QGIS. From there, it seems like I should be able to generate a polygon and tell the program to analyze pixel count for each level of color intensity.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I haven't had much GIS training, but I would really like to conduct an experiment that needs this data. Could someone please point me in the right direction?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thank you for your time,<o:p></o:p></p>
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<p class="MsoNormal">Aaron<o:p></o:p></p>
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<p class="MsoNormal"><a href="mailto:abstoler@gmail.com">abstoler@gmail.com</a><o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
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