Questions tagged [triangulation]
triangulation is the process of determining the location of a point by forming triangles to it from known points.
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Delaunay triangulation returning empty geometry in PyQGIS
I would like to compute the Delaunay Triangulation for polylines. But sometimes it works and sometimes it does not, I tried with hand drawn lines.
lines=QgsProject.instance().mapLayersByName("...
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54 views
Time-Based Multilateration
I'm not entirely certain, but I think this forum is most appropriate for this question.
I know the location of three observers. A nearby source, who's location is unknown emits a beam of radiation at ...
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How can have access to the inner features (neighbors, edges) of a triagulation remove points from the mesh under PostsGIS
I've a calculated a triangulation of a point set grouped in certain distance (buffer). For areal classification purposes, I need to calculate:
(a) the points in the unified buffer, which is easy
(b) ...
2
votes
1answer
195 views
Creating a 3D TIN or similar 3D Delaunay triangulation in R
Background: I have topographical datasets with height information as a starting point. The endgame is to create a dataset of triangulations which I can use to import into Parasolid to be used further ...
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1answer
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Getting the coordinates for tripoints where three counties intersect
I'm trying to make a simplified triangulation of a US state (say Ohio) based on the counties. The way I accomplish this is to treat all boundaries, no matter how crooked, as straight lines whose ...
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1answer
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Adding non GPS information to project?
I am a volunteer groundsman at a small golf club. I had our reticulation GPS located.
I have added the GPS locations to a georeferenced image, all good.
What I want to do now is add new sprinklers to ...
2
votes
0answers
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Incomplete Delaunay triangulation unsing pyqgis3
I'm writing a small Qgis3 python plugin to convert polygon shapefiles to input files for a scientific model.
I therefore need to split up the polygon geometries to more simple geometries with up to 4 ...
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0answers
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How to find coordinates of a triangle with azimuth?
I am just starting out in GIS and it's been a long time since I took math in university. I am teaching myself through a textbook but there are a few questions I am stumped on.
Essentially I have a ...
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1answer
100 views
JTS ConformingDelaunayTriangulationBuilder, what is the right way to set tolerance?
I have one 3D polygon and one 2D polygon. I know that 2D polygon is inside 3D polygon (when projected on the plane) and I want to find Z-coordinate for 2D polygon points. The idea is to apply ...
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1answer
129 views
Aerial Triangulation by using GPS height
Is it possible to use GPS geographic coordinates & ellipsoidal height not orthometric heights in Aerial Triangulation?
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1answer
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Sound localisation using TDoAs?
So my situation:
I've got an array of 4 microphones, 3 in a plane and one above out of plane. These microphones are connected to a micro controller which accurately time-stamps a sound when it ...
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3answers
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Differences between triangulation and trilateration
Looking around I noticed that many people interchange the terms (triangulation and trilateration) for the same sense.
What is the correct sense of Triangulation and what are the differences from ...
