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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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) ...
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Converting an ASCII File to raster image using QGIS

Following a previous issue discussed --> Cross section profile distance not providing accurate distances? It was highlighted that 1. My CRS layer projections were different to one another. this was ...
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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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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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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 ...
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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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139 views

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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74 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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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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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 ...