Questions tagged [geodesy]
For questions about the geodetic functionality of Mathematica, including the functions FromDMS, GeoPosition, GeoDistance, GeodesyData, and FindGeoLocation.
79 questions
1
vote
0
answers
126
views
Construction of numerical solution of differential equations geodesic on the sphere
I have differential equations of geodesics. I need to solve them numerically and the solution must be on a sphere.This is what the equations looks like
The geodetic on the sphere should look like ...
- 19
6
votes
2
answers
826
views
How to measure the volume of a 3D point cloud - not using ConvexHull or RippleyRassonRegion. Rather like "boundary" function in MatLab
RipleyRassonRegion and ConvexHull provide the smallest convex region enclosing all points in the set. For regions with real concavities, the volume of this region overestimates the actual volume. For ...
- 73
4
votes
1
answer
177
views
Extracting georeferenced GIS raster data as a function of coordinates
When importing geospatial raster files, the coordinates seem to be lost, if I am not mistaken. I am not sure how to get the values of raster based on the coordinates (in whatever projection the raster ...
- 1,744
1
vote
0
answers
23
views
How can I get the GeoVisibleRegion of a space-based camera sensor given it's altitude, lat, long, and pointing view vector with respect to nadir?
GeoVisibleRegion by itself provides the largest view attainable based on the curvature of the earth from a given altitude above the surface. How do I set up the problem for a narrower field of view ...
12
votes
1
answer
912
views
Why two computations for distance half way around the world don't agree?
I understand WGS84 models the equator as a circle with radius=GeodesyData["WGS84","SemimajorAxis"]. So I expected the two computations below to be the same. Where is my mistake?
<...
- 7,164
1
vote
1
answer
43
views
Approximate implementation of GeoDestination [closed]
I need an implementation to approximate GeoDestination without an internet connection. This is described here which says:
I need to solve "1. the direct geodesic problem".
Later that ...
- 7,164
1
vote
1
answer
57
views
Do you agree GeoDirection should return 90 degrees in this example?
GeoDirection[{38,-76},{38,-75}]
(* 89.6922 Degrees *)
I am using version 12.0.0.
- 7,164
9
votes
2
answers
450
views
5
votes
1
answer
262
views
Geodesics on arbitrary 2D surfaces
Geodesics on 2D Function Surfaces
I am trying to approximately find the shortets path between two point on a surface defined as z=F[x,y]. I am solving for X,Y as function t. However, when trying to ...
12
votes
2
answers
897
views
What fraction of a mountain parcel has slopes over 15%?
Update: The original error was not from the elevation data, but from the use of "Degree". See below.
An agency interested in purchasing heavily sloped land has decided to use a criterion ...
- 235
2
votes
0
answers
55
views
Maximizing the interior angles of a triangle on the Earth [closed]
Gauss once surveyed a triangle in the Harz mountains formed by Inselberg, Brocken, and Hoher Hagen to check if the sum of the interior angles really added up to $\pi$ radians. With the precision ...
- 1,854
3
votes
1
answer
270
views
Error of Points in Mollweide Projection
I am currently working on a project using SnIa data and using Mathematica I have obtained the following points (in degrees) through the maximum likelihood process
...
- 63
2
votes
1
answer
205
views
Geodesate extract angles and edges length of a polyhedron
I'm using Mathematica 11, don't have access to new functions in Geodesate.
Edited to clarify my question
What I aim to do, it is to extract the angles and length of edges of a polyhedron (also in ...
- 467
1
vote
0
answers
216
views
Mollweide Projection of a Sphere [duplicate]
I want to recreate the following picture
for a project. However, I am not sure how to do this with Mathematica. Is there an easy way to obtain just the "background" picture of the sphere without the ...
- 63
2
votes
2
answers
490
views
Converting from UPS(x, y) to geodetic latitude/longitude
I'm trying to create a program which converts latitude/longitude (wgs84) to UPS (Universal Polar stereographic) coordinates, and then UPS(x, y) to WGS 84. I mean Given UPS(x, y), be able to compute ...
- 21
3
votes
1
answer
77
views
GeoPosition of a point a specified GeoDistance away
I am trying to plot text on a GeoGraphic[] at a certain distance from a defined point (located at Interpreter["Airport"]["KEWR"] ...
- 255
4
votes
1
answer
106
views
19
votes
2
answers
1k
views
Project map to a particular shape
I want to project a map to a particular shape, like a circle or ellipse. For example, let's imagine we want to project a map of the continental United states so that its outline is that of a circle. ...
- 4,102
0
votes
0
answers
185
views
Historical Weather Data for every Country in the World
I am trying to create a list of the average global temperatures per-year for the last 18 years using the WeatherData function. You can input a set coordinates ...
- 119
3
votes
1
answer
217
views
GeoArea of an Intersection
I am looking to calculate the geographic area of an intersection of a GeoDisk with a geographic entity such as a county.
I was hoping for a simple construct like:
...
- 431
1
vote
1
answer
89
views
Which Question about plotting a location on a map.
I am plotting the wind speed vectors of hurricane Harvey on a graph and I want to add a dot located at coordinates of Dallas.
...
- 119
0
votes
1
answer
108
views
Hurricane Graphics: Help with Coloring a Graph
So currently I have a graph of latitude, longitude, and Max Rainfall generated from the code below.
...
- 119
0
votes
1
answer
109
views
Trying to plot points of rainfall during Harvey on a map of Texas and color code points
I am trying to plot lat, lon, and maximum rainfall of hurricane Harvey on a Map of texas. I have gathered all the data inside Mathematica using station names and the WeatherData function. This is the ...
- 119
4
votes
0
answers
123
views
DynamicGeoGraphics misplaces dynamic Points
Bug introduced in 10.4 and persisting through 11.2
CASE:3971576
I need to highlight a selected point in a DynamicGeoGraphics. I use a ...
- 43.2k
6
votes
2
answers
614
views
How to obtain the distance (in Km/Miles and in minutes) by road ?. for example using googlemaps
How to obtain the distance between 2 geographical points (knowing the latitute and longitude)
One easy way in the web is
https://www.google.es/maps/dir/42.6897189,-8.4912382/42.\
8659508,-8.6709907/@...
- 3,261
7
votes
1
answer
176
views
Orthogonal Geodesics to Solar Eclipse Geopath
I'm trying to find the perpendicular geodesics to the path the upcoming solar eclipse will take:
Path:
...
- 2,357
0
votes
1
answer
250
views
use of GeoDistance on WGS84 spheroid
The reference WGS84 describes the Earth as oblate spheroid with semi-minor axis (radius to poles) of 6356.752 km and semi-major axis (radius to equator) of 6378.137 km.
I am considering the distance ...
- 1
4
votes
1
answer
167
views
Find the GeoArea of overlapping GeoDisks
Given a set of GeoDisks, how can one determine the combined region area, presumably through GeoArea? ...
- 43
2
votes
1
answer
241
views
How to calculate the maximal GeoDistance and TravelDistance in a geo-region
This is current method to find the maximal EuclideanDistance in American
...
- 27.2k
4
votes
0
answers
133
views
GeoHistogram does not plot all data when points are spaced out
GeoHistogram appears to be leaving out some of the data given to it. A minimal example follows.
...
- 43.2k
9
votes
1
answer
353
views
How to speed up geographic entity lookup (reverse geocoding?)?
I have a very large set of coordinates (40,000+) that I need to categorise in a hierarchy of geographic entities; region, country, administrative divisions, city. I only have the coordinates and no ...
- 43.2k
12
votes
1
answer
218
views
How can I show the relative size of two GeoGraphics objects?
I've created a GeoGraphics object from data I collected on a recent trip across part of Michigan, like so:
I'd really like to overlay another country to scale in the center of this image to give a ...
- 365
13
votes
3
answers
906
views
GeoPosition coordinates from Shape file (.SHP) with unknown Datum
The City of Amsterdam supports an Open Data policy. Much information can be retrieved at the level of boroughs (stadsdelen). Unfortunately, GeoGraphics does not ...
- 1,913
1
vote
0
answers
326
views
GeoGraphics with GeoServer option to fetch Google Maps in Mathematica 11
The GeoServer option in Mathematica 11 can be used to get a Google-Maps satellite background in GeoGraphics; a very useful feature. E.g.
...
- 1,268
5
votes
1
answer
268
views
GeoPath to list of coordinates
I'm trying to interpolate a GeoPath to an n-size list of GeoPositions. There doesn't seem to be any documentation on this seemingly common operation anywhere. Is this even possible?
- 211
3
votes
1
answer
3k
views
Calculate Distance between UTM coordinates?
I know this question looks like a duplicate of this, but in that post, the answer does not give the right answer.
So....
Given two UTM coordinates, how would I go about finding the distance between ...
- 341
16
votes
2
answers
6k
views
How can I generate an interrupted projection of a world map?
How can I generate a world map like the one here, but for an arbitrary hand-drawn map?
For example, starting from scratch, how can I manipulate this world map
to get something that looks like ...
- 1,671
4
votes
2
answers
277
views
GeoRegionValuePlot not using ColorFunction colours
I have a custom Blend for use with GeoRegionValuePlot's ColorFunction option.
...
- 43.2k
3
votes
0
answers
122
views
How to specify image quality for GeoStyling "GeoImage" in GeoGraphics?
I am creating plots (ContourPlot, SmoothDensityHistogram, etc.) that I then need to project onto geographic polygons. When this ...
- 43.2k
2
votes
1
answer
435
views
How to align GeoGraphics "GeoImage" with GeoPositions?
I have latitude and longitude locations that I need density (or contour) plot to overlay on a map. For example:
...
- 43.2k
8
votes
0
answers
116
views
Is there a Function like Here or FindGeoLocation[] that pulls GPS from an Android device for Wolfram Cloud deployments?
Neither FindGeoLocation[] nor Here really work when deploying to the cloud for a mobile or browser app.
...
- 471
21
votes
2
answers
589
views
Why does the GeoGraphics Frame show different Latitude than GeoPosition?
The map looks right, but the Latitude in the Frame looks wrong.
Am I making a mistake or is this a bug?
- 471
4
votes
1
answer
2k
views
Creating a latitude longitude image
The GeoPosition of Eureka, California is:
GeoPosition[{40.7933, -124.155}]
Has anyone ever created an image of the world with ...
- 15k
8
votes
1
answer
429
views
Wrong bearing between two GeoPositions compared to Google Earth
I'm trying to calculate a bearing (degrees, distance) between two points, a and b. From Google Earth I have two points and the ...
- 213
8
votes
1
answer
224
views
How to control style of GeoScaleBar?
I'm plotting the GeoScaleBar over satellite image and wish it to be white but cannot find an option which controls its styling:
...
- 62.3k
1
vote
0
answers
644
views
Convert large KML coordinate datasets to UTM [closed]
I was wondering if there are ways to convert massive amounts of KML coordinates into UTM coordinates using Mathematica. Other programs would also be acceptable. Thanks.
I have the KML file from ...
1
vote
0
answers
152
views
Plot Multibeam bathymetry grid
I don't speak Mathematica very well, but I am sure I could do great things with this programming language!
I will delete this question if it is a duplicate, but I will be glad if you could point me ...
- 31
12
votes
2
answers
647
views
How to make geometric intersection faster for geographic borders?
I have developed a solution to identify geographic regions bordering a region in this post (94723).
Can this functionality be made to execute any faster? Find which entities in a set border other ...
- 43.2k
16
votes
4
answers
627
views
Administrative Divisions bordering a geographic region (e.g. an ocean)
Update 3
I've worked out a solution that is bearable for a small number of subregions in the neighbour and added it as an answer. I'm going to make a post for optimisation help.
Update 2
For a ...
- 43.2k
9
votes
1
answer
468
views
Does GeoGraphics support Elliptical Mercator projection?
When working on the answer to this question I found that GeoGraphics seemingly uses by default the Spherical Mercator projection (also known as "Web Mercator") ...
- 62.3k