[Qgis-user] [Qgis-community-team] consultation

[Alexander Bruy]

Please stop cross-posting the same message to all mailing lists you were
able to find.

ср, 21 черв. 2023 р. о 21:46 Juan Pablo Moreno Sebastian <
jpablotop at hotmail.com> пише:

> Good afternoon.
>
> I'm Juan Pablo Moreno.
>
> I have to develop a plugin for QGIS that calculates the orographic
> prominence of the hills and then goes on to classify the points.
> I will now explain my idea more slowly.
>
> 1º The plugin must load an MDT.
> 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.
> 3º Calculation of the orographic prominence of each hill.
> *Prominence:*
> The *prominence *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.
> *Prominence = mountain altitude - altitude minimum point*
>
>
>
> To calculate the prominence, a program would have to be developed that did
> something similar to the following:
>
> 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.  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.
>
> We apologize for the inconvenience.
> 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.
>
> Thank you very much for everything.
> Best regards.
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>


-- 
Alexander Bruy
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