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<p class="MsoNormal">Hi karsten – thanks again for all these tips, the graphical modeler tutorial was an excellent “discovery”!!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:8.0pt;font-family:"Arial",sans-serif">Mike Seskin</span></b><span style="font-size:8.0pt;font-family:"Arial",sans-serif"> <b><span style="color:#FFC000">|</span></b>
EQL <br>
Office: (858) 694-1851 <b><span style="color:#FFC000">|</span></b> Cell: (442) 245-1779<br>
Email: seskin_michael_x@solarturbines.com<br>
Solar Turbines Incorporated</span><span style="font-size:8.0pt"> <o:p></o:p></span></p>
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<p class="msipfooter80f9317" style="margin:0in"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#737373">Caterpillar: Confidential Green</span><o:p></o:p></p>
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<p class="MsoNormal"><b>From:</b> karsten <karsten@terragis.net> <br>
<b>Sent:</b> Monday, March 14, 2022 10:43 PM<br>
<b>To:</b> 'karsten' <karsten@terragis.net>; Mike Seskin <Seskin_Michael_X@solarturbines.com>; qgis-us-user@lists.osgeo.org<br>
<b>Subject:</b> RE: [Qgis-us-user] New to QGIS and Spatial analysis<o:p></o:p></p>
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<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-size:13.5pt;font-family:"Arial Bold";color:black">CAUTION: EXTERNAL EMAIL</span></b><span style="font-size:13.5pt;font-family:"Arial Bold";color:black">
<br>
This is a message from <a href="mailto:karsten@terragis.net">karsten@terragis.net</a>.
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Use caution when opening unexpected emails and do not click on links or attachments from unknown senders.
<br>
For more resources, visit security.cat.com/phishing.</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:black">
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy">actually when I think about it - it seems that you really can just use the Model designer
<br>
and use the 3 step in there I initially mentioned - that should work because using the
</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy">"Rectangles, ovals, diamonds" tool you indeed can already create the 1mi² buffer ...</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy">Karsten</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif"> Qgis-us-user [<a href="mailto:qgis-us-user-bounces@lists.osgeo.org">mailto:qgis-us-user-bounces@lists.osgeo.org</a>]
<b>On Behalf Of </b>karsten<br>
<b>Sent:</b> Monday, March 14, 2022 22:38<br>
<b>To:</b> 'Mike Seskin'; <a href="mailto:qgis-us-user@lists.osgeo.org">qgis-us-user@lists.osgeo.org</a><br>
<b>Subject:</b> Re: [Qgis-us-user] New to QGIS and Spatial analysis</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy">Hi Michael,</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy"> >>> </span><span style="font-size:12.0pt;font-family:"Times New Roman",serif">Yes, a couple of follow-up questions if you don’t mind…is there a way to automatically
define a 1 square mile extent around each point in my shape file? </span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy"> </span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy">You could do that in multiple ways.
<br>
Possibly the easiest would be if you just used a circular buffer around each point and then calculated back from the circle area you would want the buffer to contain using the a mathematical circle area calc. Such as 1km² = ð * r² -> resolve by r. You could
also use miles . However keep in mind that this exact area will depend on the map projection and associated map units used. So if your map projection units are in meters you will need to use those for the the conversion-
</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy">However with naturally more difficult to use units (such as feet and miles) a conversion is necessary anyways :)</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy"><br>
So overall using the circular buffer radius would give you potential cut shape. Now the problem is that raster (not really) can be cut by circular shapes (well it works kind of visually at least), but a raster is rectangular feature, however can contain NULL
values for values outside a cut line.</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy">Another way would be to calculate the edge points of a 1mi² square that you then create around the point as a center - it could e.g. involve a python script that
you can use with the python console in QGIS ...</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy">e.g.
<a href="https://urldefense.com/v3/__https:/www.qgistutorials.com/en/docs/processing_python_scripts.html__;!!M7dyoZOwuwF45AU!jTzfzhkUd3m7Qhmk3Tmz2G6s14fiNWqQ8rJXUz1gbZM_QuYBxR7N-7NshB92_SHk63GvCLg2Ars$">
https://www.qgistutorials.com/en/docs/processing_python_scripts.html</a></span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy">Maybe there is a ready made tool out there where someone has done something similar that can be reused, but so far I am not ware of one ...</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy">Now there is also an option to sue a buffer with miter join style to create a rectangular buffer . Here I am not sure what the buffer distance exactly would be maybe
try it out to get to 1mi² but you can do trial runs to get near that desired area size
<br>
<a href="https://urldefense.com/v3/__https:/gis.stackexchange.com/questions/277306/creating-square-buffer-in-qgis__;!!M7dyoZOwuwF45AU!jTzfzhkUd3m7Qhmk3Tmz2G6s14fiNWqQ8rJXUz1gbZM_QuYBxR7N-7NshB92_SHk63Gvq2kYYIA$">https://gis.stackexchange.com/questions/277306/creating-square-buffer-in-qgis</a> </span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif">>>> And then can I run the “convert map to raster” tool automatically on each area. So for instance if I have a shape file with 10 points layered on Google satellite, can
I use the “convert map to raster” to automatically create 10 satellite image files?</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy"> <br>
You can do that and it would involve</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"> </span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy">the Model designer in QGIS. You can create a model for reuse and add
that to the processing tools ..<br>
e.g. see <a href="https://urldefense.com/v3/__https:/docs.qgis.org/3.22/en/docs/user_manual/processing/modeler.html?highlight=model*20designer__;JQ!!M7dyoZOwuwF45AU!jTzfzhkUd3m7Qhmk3Tmz2G6s14fiNWqQ8rJXUz1gbZM_QuYBxR7N-7NshB92_SHk63GvG5NAYok$">
https://docs.qgis.org/3.22/en/docs/user_manual/processing/modeler.html?highlight=model%20designer<span style="color:navy"><br>
</span></a>and here <a href="https://urldefense.com/v3/__https:/www.youtube.com/watch?v=eZb5VLTc9-o__;!!M7dyoZOwuwF45AU!jTzfzhkUd3m7Qhmk3Tmz2G6s14fiNWqQ8rJXUz1gbZM_QuYBxR7N-7NshB92_SHk63GvC8EywMg$">
https://www.youtube.com/watch?v=eZb5VLTc9-o</a>.</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><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"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy">Cheers</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:navy">Karsten
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<p class="MsoNormal"> <o:p></o:p></p>
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