<div dir="ltr">Please stop cross-posting the same message to all mailing lists you were able to find.<div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">ср, 21 черв. 2023 р. о 21:46 Juan Pablo Moreno Sebastian <<a href="mailto:jpablotop@hotmail.com" target="_blank">jpablotop@hotmail.com</a>> пише:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>
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<span style="font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">Good afternoon.</span><br>
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<div>I'm Juan Pablo Moreno. </div>
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<div>I have to develop a plugin for QGIS that calculates the orographic prominence of the hills and then goes on to classify the points.</div>
<div>I will now explain my idea more slowly.</div>
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<div>1º The plugin must load an MDT.</div>
<div>2º Locate hills by analysis of each cell of the MDT and those of its surroundings. I locate a cell and if the surroundings are of lower level it will be a possible hill, the holes would be the other way around.</div>
<div>3º Calculation of the orographic prominence of each hill.</div>
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<span style="font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)"><span> </span><u>Prominence:</u><br>
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<span style="font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)"> The
<b>prominence </b>of a mountain is a notion used in orography for the classification of mountains. It is defined as the minimum slope that must be descended from the top of a mountain to ascend to a higher one. The more prominent a mountain is, the more it
will stand out among those around it, regardless of its altitude.<br>
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<span style="font-size:14px;font-family:sans-serif;margin:0px;color:rgb(32,33,34);background-color:rgb(255,255,255);display:inline"><span style="margin:0px"> </span><span style="margin:0px"> <span> </span><span> <b>Prominence
= mountain altitude - altitude minimum point</b></span></span><br>
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<span style="font-size:14px;font-family:sans-serif;margin:0px;color:rgb(32,33,34);background-color:rgb(255,255,255);display:inline"><b style="background-color:rgb(255,255,255)"><br>
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<span style="font-size:14px;font-family:sans-serif;margin:0px;color:rgb(32,33,34);background-color:rgb(255,255,255);display:inline"><span style="margin:0px"> </span><img size="43302" style="margin:0px;max-width:100%;min-width:auto;min-height:auto;height:auto" src="cid:188e11a8ffecb971f161"><br>
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<span style="font-size:14px;font-family:sans-serif;margin:0px;color:rgb(32,33,34);background-color:rgb(255,255,255);display:inline">To
calculate the prominence, a program would have to be developed that did something similar to the following:
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<span style="font-size:14px;font-family:sans-serif;margin:0px;color:rgb(32,33,34);background-color:rgb(255,255,255);display:inline">An
analogy widely used to explain these relationships and, incidentally, to illustrate a possible procedure for detecting hills and hills, alludes to the myth of the universal flood. We imagine that the earth has been flooded under a thick blanket of water that
covers it completely, without leaving a single piece of land emerged. After the end of the flood, the evaporation of water causes small islands to begin to emerge. The first to appear is the summit of Everest and the following, other summits of the Himalayas.
As the sea level drops due to evaporation, the surface area occupied by each island increases and there comes a time when the level is low enough for the island to merge with another land mass through some isthmus that has been exposed.</span><span style="font-family:sans-serif;font-size:14px;color:rgb(32,33,34)"> The
exact point at which the connection of two islands occurs coincides with a col and is associated with the summit of the lower altitude island to determine its prominence. The value is obtained from the difference in height between the hill and the associated
hill, as can be seen from its definition.</span></div>
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<font face="sans-serif" style="color:rgb(32,33,34)"><span style="font-size:14px;margin:0px">We apologize for the inconvenience.
<div>If you find the subject interesting or were so kind as to guide me a little?, tell me if it sounds like something or know something similar?, give me some advice on where or how to start?, or if you have another idea on the
subject, I am very lost in python programming and everything would be very helpful, I would be very grateful.</div>
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<div>Thank you very much for everything.</div>
Best regards.</span></font></div>
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</div></blockquote></div></div></div></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature">Alexander Bruy</div>