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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">To my mind the outputs of Union should be the largest extent area and Intersect is the smallest extent area. However any explanation
in words alone will always have some ambiguity. It can’t be avoided.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Union and Intersect via Wiki.GIS.com (I do find the intersect diagram less clear in this example than the next one):<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><img width="300" height="107" style="width:3.125in;height:1.1166in" id="Picture_x0020_1" src="cid:image001.jpg@01D8E2CB.3FB14410" alt="http://wiki.gis.com/wiki/images/thumb/2/28/Union.jpg/300px-Union.jpg"></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><img width="300" height="104" style="width:3.125in;height:1.0833in" id="Picture_x0020_3" src="cid:image002.jpg@01D8E2CC.3BE26C50" alt="http://wiki.gis.com/wiki/images/thumb/4/4e/Demo_one.JPG/300px-Demo_one.JPG"></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Union and Intersect in Wikipedia polygon theory:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><img width="480" height="374" style="width:5.0in;height:3.9in" id="Picture_x0020_4" src="cid:image005.gif@01D8E2CC.BDA0FE00"></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><a href="http://wiki.gis.com/wiki/index.php/Union">http://wiki.gis.com/wiki/index.php/Union</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><a href="https://en.wikipedia.org/wiki/Boolean_operations_on_polygons">https://en.wikipedia.org/wiki/Boolean_operations_on_polygons</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1F497D">-Matt</span><i><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></i></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> gdal-dev <gdal-dev-bounces@lists.osgeo.org>
<b>On Behalf Of </b>Idan Miara<br>
<b>Sent:</b> October 17, 2022 1:55 AM<br>
<b>To:</b> Nicolas Godet <nicolas.godet@outlook.fr><br>
<b>Cc:</b> Andrew C Aitchison <andrew@aitchison.me.uk>; gdal-dev@lists.osgeo.org<br>
<b>Subject:</b> [EXT] Re: [gdal-dev] [Doc] gdal_calc.py extent option<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi! <o:p></o:p></p>
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<p class="MsoNormal">I needed the docs are correct but as this is the second time it confuses people maybe the wording should be revised?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><a href="https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FOSGeo%2Fgdal%2Fpull%2F5969&data=05%7C01%7CMatt.Wilkie%40yukon.ca%7C8ec9f2c95b7c485d163508dab01d7941%7C98f515313973490abb70195aa264a2bc%7C0%7C0%7C638015937908111424%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000%7C%7C%7C&sdata=qgiJYx5KjebSDNQrw4QJHhY%2FrntE1Pyxfn32x31xlus%3D&reserved=0">https://github.com/OSGeo/gdal/pull/5969</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Any ideas? <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Mon, 17 Oct 2022, 11:49 Nicolas Godet, <<a href="mailto:nicolas.godet@outlook.fr">nicolas.godet@outlook.fr</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black">Indeed, this is right.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black">My bad..<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">De :</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> Andrew C Aitchison <<a href="mailto:andrew@aitchison.me.uk" target="_blank">andrew@aitchison.me.uk</a>><br>
<b>Envoyé :</b> lundi 17 octobre 2022 10:25<br>
<b>À :</b> Nicolas Godet <<a href="mailto:nicolas.godet@outlook.fr" target="_blank">nicolas.godet@outlook.fr</a>><br>
<b>Cc :</b> <a href="mailto:gdal-dev@lists.osgeo.org" target="_blank">gdal-dev@lists.osgeo.org</a> <<a href="mailto:gdal-dev@lists.osgeo.org" target="_blank">gdal-dev@lists.osgeo.org</a>><br>
<b>Objet :</b> Re: [gdal-dev] [Doc] gdal_calc.py extent option</span> <o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">On Mon, 17 Oct 2022, Nicolas Godet wrote:<br>
<br>
> Dear Devs,<br>
><br>
> In documentation<<a href="https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgdal.org%2Fprograms%2Fgdal_calc.html%23cmdoption-extent&data=05%7C01%7CMatt.Wilkie%40yukon.ca%7C8ec9f2c95b7c485d163508dab01d7941%7C98f515313973490abb70195aa264a2bc%7C0%7C0%7C638015937908111424%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000%7C%7C%7C&sdata=ZQebVL1FblaUBIaZBYBsXHNJ0JfFm4nO8RzK2Gp4TZE%3D&reserved=0" target="_blank">https://gdal.org/programs/gdal_calc.html#cmdoption-extent</a>>,
extent param description seems a bit odd to me.<br>
><br>
><br>
> union - the extent (bounds) of the output will be the minimal<br>
> rectangle that contains all the input extents.<br>
><br>
> intersect - the extent (bounds) of the output will be the maximal<br>
> rectangle that is contained in all the input extents.<br>
><br>
> Shouldn't it be the other way around?<br>
<br>
I think this *is* the right way round;<br>
"all" can be misunderstood but I can not think of a clearer phrasing,<br>
although "every one of" might help.<br>
<br>
> As I intend to add this option to QGIS gdal_calc window (very useful<br>
> option), I must be sure.<br>
<br>
-- <br>
Andrew C. Aitchison Kendal, UK<br>
<a href="mailto:andrew@aitchison.me.uk" target="_blank">andrew@aitchison.me.uk</a><o:p></o:p></span></p>
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