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Questions tagged [geodesic-sphere]

44 questions
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4 answers

Math for a geodesic sphere

I'm trying to create a very specific geodesic tessellation, but I can't find anything online about it. It is normal to subdivide the triangles of an icosahedron into triangle patches and project them onto the sphere. However, I noticed an animated…
Marcelo Cantos
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Check if point is inside a circle

I have a point expressed in lat/long Position louvreMuseum = new Position( 48.861622, 2.337474 ); and I have a radius value expressed in meters. I need to check if another point, also expressed in lat/long, is inside the circle. If I were on a flat…
Lorenzo
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Algorithm for a geodesic sphere

I have to make a sphere out of smaller uniformely distributed balls. I think the optimal way is to build a triangle-based geodesic sphere and use the vertices as the middle points of my balls. But I fail to write an algorithm generating the…
Kyle_the_hacker
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New Xcode beta new problems: MKGeodesicPolyline

The brand new Xcode version, in addition to removing a wide nume of place where to add an empty function call, introduced a funny problem with an simple piece of code drawing a geodetic path: func drawPolyline(from startLocation: CLLocation,…
Fabrizio Bartolomucci
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Which one of these azimuth values is the right one? And why?

First of all, let's make clear that I want the Azimuth on the surface of the Earth, i.e. the angle between two locations, for example New York and Moscow. I am testing some azimuth calculations with my JS functions (shown below). For the points…
joaorodr84
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Geodesic distance between geometry shapes Python

Having a dfA with a column called geometry with the following geometrical shapes: d = {'id': [1, 2], 'geometry': ['POINT (-70.66000 -33.45000)', 'POINT (-74.08000 4.60000)']} dfA = pd.DataFrame(data=d) dfA | | id | geometry …
David Ordoñez
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Google Static Maps Issue: Geodesic path having corners

I am having issues with geodesic path/polylines with Google Static Maps. Buggy map with…
tobidude
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Proj4j projection results wildly inaccurate

I'm trying to use EquidistantAzimuthalProjection to get the latitude/longitude of a new location based on its relative distance and bearing to a known location. Here is my source code: import org.osgeo.proj4j.ProjCoordinate import…
tribbloid
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Is the Azimuth on the equator equal to the one not on the equator?

I am trying to fully understand the concept of Azimuth and I am encountering some inconsistencies (or maybe it is my error). I show you some examples that do not match, hoping somebody can explain me how this really works. I show the coordinates in…
joaorodr84
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Calculate latitude longitude points of geodesic grid triangle points (preferable using python)

I would like to divide a sphere with a certain radius into a geodesic grid with the triangle edges of around a certain size. As a result I would like to have a list of latitude/longitudes of all the triangle edge points (or center points). My…
joosthoek
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THREE.JS - Flatten a geodesic polyhedron

I'm working on a hex-tile based planet generator- think Civ5 terrain projected onto a geodesic sphere. The image that follows is the top half of such a shape: Figure I am looking to flatten these individual hexagons and pentagons into a plane,…
Lucas Young
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Efficiently compute pairwise haversine distances between two datasets - NumPy / Python

I want to calculate the geo-distance between latitude-longitude. I had checked this thread Vectorizing Haversine distance calculation in Python but when I am using it for two different set of coordinates, I m getting an error. df1 size can be in…
Rajat Gupta
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How can I create a label that always stays near a polyline in Cesium.js?

I have a situation where I'm using Cesium.js entities to draw bearing lines from a point. In addition, I'd like to have a label attached to these bearing lines on the entity to show what it is. This is easy enough to do by attaching a label to the…
stix
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Splitting a string containing a longitude or latitude expression in perl

I retrieve data from the net containing real geodesic expressions, by that I mean degrees, minutes and seconds with Unicode symbols: U+00B0, U+2032 and U+2033, named Degree, Prime and Double Prime. Example: my $Lat = "48° 25′ 43″ N"; My objective…
perlboy
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GeoDesic Buffers sample code does not work in my local IIS Server

I am new to use ArcGis Api for javascript, I am using JS Api 3.20. I have been trying for 3 days but it does not work. I have taken code from the following link Geometry Engine - Geodesic buffers | ArcGIS API for JavaScript 3.20 I paste…
user7730840
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