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 < jpablo...@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. > _______________________________________________ > Qgis-community-team mailing list for organizing community resources such > as documentation, translation etc.. > qgis-community-t...@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/qgis-community-team > -- Alexander Bruy
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