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calculation maximum polygon section in the date direction

  • Thread starter Thread starter brighela
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brighela

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Good morning to all,
are taken with the calculation of the maximum extension, or the maximum section, in a given direction, of an irregular polygon. in other words, defined an area by an irregular polygon I have to calculate its length in the direction of the layer and its width in the orthogonal direction to the direction of the ground; I know of course.
is there a function to this applicable in autocad?
Thank you.
Brighela
 
It's probably because I'm not in business... but I didn't understand a thing...
 
We're in two.
@BrighelaPlease reset everything and rewrite the question as if I had to explain the concept to my illiterate grandmother, thank you.

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I believe that brighela intends to know the sides (measured on the plane of the slope) of the rectangle containing its irregular polygon, given the direction of the slope.

We wait for lumi.
 
I try to talk to the illiterate grandmother, and from illiterate, at least of autocad, should not be difficult. First we are on two x and y dimensions, the z is equal for all points both the plan and the straight. imagine you have a north/east -south/west direction and an irregular polygon (especially a thiessen polygon). My task is to determine the maximum extension of the polygon in the direction of the layer. If, for example, the polygon was a rectangle with the base on the x axis, the maximum extension in the direction of the layer would not correspond either to the length of the y side or that of the diagonal, but to the length of the straight segment that from the x1y1 summit crosses the rectangle in direction 45°. Unfortunately I don't know how to insert an image to explain myself better.
Thank you.
Brighela
 
brighela said:
I try to talk to the illiterate grandmother, and from illiterate, at least of autocad, should not be difficult. First we are on two x and y dimensions, the z is equal for all points both the plan and the straight. imagine you have a north/east -south/west direction and an irregular polygon (especially a thiessen polygon). My task is to determine the maximum extension of the polygon in the direction of the layer. If, for example, the polygon was a rectangle with the base on the x axis, the maximum extension in the direction of the layer would not correspond either to the length of the y side or that of the diagonal, but to the length of the straight segment that from the x1y1 summit crosses the rectangle in direction 45°. Unfortunately I don't know how to insert an image to explain myself better.
Thank you.
Brighela
Click to expand...
forget it with autocad... try with mathcad or mathematica or matlab or similar. . .
 
I'm sorry for the hard-and-clean caddists, but I would have devised the following solution. very much Empirical.

1] I create a retino "user defined" with inclination parallel to the layer and pitch very thick (i.e., so much less the step, the greater the final precision)

2] I apply this sample to irregular polygon

3] Exploding sampling

4] the longest of these lines exploded will be the maximum secretion (and not "section", dear brighela).

By the way, the effect is This is.

as to the way to "find" that longest line, I pass the word to the Lispist masters. . .

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as it cited "the thiessen polygon", looking on google it turns out that the problem is not related to a roof layer, but it concerns the interpolation of data on a thematic and statistical cartography (e.g. to identify the zone of influence of a city for the time of reaching, taking into account different factors (paesage, orography, hydrography, etc). There are other programs that solve this problem of purely mathematical and probable nature, so not only geometric.
because it asks even if there is a specific function of autocad, I think it already knows these programs in gis, type arcgis, but does not possess the license.
 
RIMMING said:
How did you do that animation? ! ?
Click to expand...
...with This is old but always arzillo freeware of uncle bill.
@ josephthe word "falda" but does not belong to the world gis...

I think rather that the 'falda' is that aquifer, and that therefore the good brighela is doing a hydrogeological study.

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CADlandiano said:
...with This is old but always arzillo freeware of uncle bill.
@ josephthe word "falda" but does not belong to the world gis...
Click to expand...
On the contrary. the term falda can also be understood as a elementary part of a more complex structure for the representation of a digital surface (tin). any gis software that uses three-dimensional information manages the networks of triangles (or falde) :wink:
 
Tin as a whole of falde is an expression I didn't know: I learn more things in 1 day of cad3d, than in 1 month elsewhere.. .

:wink:
 
to all,
First of all, I refer to the management of the phthalate within a risk analysis study relating to a contaminated site. we are therefore talking about environmental engineering. the hydrogeological study has already been conducted, from here the fact that I know the direction of the hectic ground. the problem arises from having to dimensional the secondary source of contamination, or in first approximation the rectangle that represents it starting from the polygon of influence obtained with the technique of thiessen polygons. the rectangle representing the secondary source to the sides the maximum length of the polygon in the direction of the layer and the width in the orthogonal direction, all on a plane at altitude 0.
the solution proposed to use the retini seems interesting, I will try. I really wanted to find out if there was already an internal "program" with autocad or a gis software that performed this function.
Thank you.
Brighela
 
brighela said:
I am referring to the direction of the friatic layer
Click to expand...
I told you, Tristan? (and I am due...) :wink:
@BrighelaUnfortunately, no one is offering to make you a whistle that determines the longest line of the exploded retino, but I have an idea: what version of autocad you have?

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brighela said:
autocad version 2008
Click to expand...
as not mentioned, with your "normal" autocad you can not export in shape then "holy".

I'm sorry, I just hope that some of the lisp gurus come forward to determine the longest line in a selection (i.e., I think of my famine. . . )

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