Questions tagged [geographics]
Questions on the family of Geo* functions, e.g. GeoGraphics, GeoEntities etc.
256
questions
4
votes
1
answer
88
views
How to place an arrayplot/image on a GeoGraphics?
Take a random example data matrix
data = Table[i, {i, 100}, {j, 200}] / 100;
which we could plot as an ArrayPlot or ...
- 42.8k
2
votes
0
answers
66
views
Regional Rank Choice Voting on Maps
So, I made an algorithm to do rank choice voting on regions. Based on where you are, votes for candidates are stored in specific position in each list that labels the region. If there is a tie, then ...
- 114
5
votes
1
answer
326
views
GeoJSON Problems - UK Parliamentary Constituencies
I want to plot the new parliamentary boundaries for the upcoming general election.
This will use an NIHR API to grab the map location of the FID=3, the 3rd parliamentary constituency in alphabetical ...
- 4,594
4
votes
0
answers
126
views
TimeLine Plot of Every Historical Country/Empire - how to control y axis
I'm trying to see if Mathematica can make a similar timeline to this. Specifically, note that the y axis of the graphic is based on current countries. I'd like to make a Timelineplot where I can ...
- 4,594
7
votes
1
answer
149
views
GeoProjection - Spilhaus Projection of 1942 or Adam Square II
How can I make a GeoProjection like this?
The best I could get was:
...
- 4,594
3
votes
1
answer
70
views
CountryData syntax
Which of the following syntax variations are correct? For the incorrect? syntax, what does the obtained value represent? Statements 2/3 and 4/5 are identical; I was trying to see if it was a bug.
<...
- 56.1k
2
votes
0
answers
38
views
GeoProjection used in area computation of relatively small regions
Let's define a relatively small region via GeoPosition as follows.
pos = GeoPosition[{{48, 9}, {48.0001, 9}, {48.0001, 9.0001}, {48, 9.0001}}, "WGS84"]
...
- 487
5
votes
1
answer
270
views
Making Adjacency Matrix from Maps
I want to make an adjacency matrix for the world/each country at a specified administrative level. This is very easy to do for countries in Mathematica, but is not straightforward for different ...
- 114
5
votes
3
answers
411
views
Recreating map from Wolfram|Alpha with GeoGraphics
I have tried to create a map using GeoGraphics, and I have not been able to get one with the same quality as the result Wolfram|Alpha gave me.
...
4
votes
0
answers
74
views
Interpreting the coordinates in a shapefile
I am trying to interpret the coordinates in the shapefile downloadable from here (Dataset 1).
We can extract coordinates like so:
...
- 236k
6
votes
1
answer
313
views
Calculating Point Nemo
I am referring to Point Nemo which is the point farthest from any emerged land mass. Some relevant information can be found on this page.
I am not sure about -ve signs or whether it is the exact ...
- 56.1k
7
votes
1
answer
324
views
Length of a continental perimeter
Excluding the islands, how can the length of the perimeter of a continent be calculated?
To make the question more concrete, what is the length of perimeter of the African continent, excluding the ...
- 56.1k
0
votes
0
answers
25
views
DynamicGeoGraphics rendering error when AspectRatio is given, and the output does not match ImageSize
Here's a minimal example.
gm = GeoMarker[{{42.34, -71.08}, {42.35, -71.07}, {42.36, -71.06}}];
DynamicGeoGraphics[gm,AspectRatio->1]
Since GeoGraphics does ...
- 73
8
votes
2
answers
199
views
Getting Area from GeoGraphics
I want to find the area covered by the reservoir of a dam using a satellite image.
This is what I have so far.
...
- 171
0
votes
1
answer
106
views
How to take a satellite image in Mathematica at different times?
I want to see the satellite image of the same area at different times. But by entering the following code, also shows the same picture with changing times.
...
- 155
0
votes
1
answer
45
views
Using Show with GeologicalPeriodData
In an effort to understand how to use GeologicalPeriodData and extending an example provided in the instructions, I created four GeoGraphics plots of bedrock of varying ages. Each sizes nicely, as ...
- 1,943
5
votes
1
answer
90
views
Preserve Color In GeoBackground
When you use a ReliefPlot as a GeoBackground, it seems to change the underlying colour scheme. Is it possible to preserve the ...
- 4,594
1
vote
1
answer
74
views
Combining ReliefPlots with GeoGraphics/Converting ReliefPlots into GeoGraphics
I want to use .DEM files with GeoGraphics[]. For example, adding labels, or changing projections.
In my attempt, I import the example data from Wolfram.
...
- 4,594
1
vote
0
answers
30
views
Superimpose a GeoGraphics Plot on Another [duplicate]
I'd like to superimpose a GeoGraphics image of Israel onto a GeoGraphics image of the United States in a manner that maintains ...
- 1,919
2
votes
0
answers
112
views
Adjacency matrix from geographics
The following code shows the map of a number of cities in a country having a population between a specified minimum and maximum value.
...
- 375
1
vote
2
answers
228
views
Map water runoff flows near Ellicott City, Maryland
Ellicott City, Maryland was the site of a flash flood several years ago due to the local topography. How can we use the Wolfram Language to show the direction water flows at many points near that city?...
- 969
5
votes
1
answer
227
views
Display the flood zone near Elicott City MD
Ellicott City, Maryland was the site of a serious flash flood several years ago, due to the local topography. How can we use the Wolfram Language to make a graphic that shows the area at risk of ...
- 969
1
vote
2
answers
319
views
How to get the centroid of a geographical region? (or: the center of mass of Croatia is in Bosnia and Herzegovina, but where exactly?) [duplicate]
How can I get Mathematica to calculate the centroid of an extended geographical region (say, a country) in a way which (i) fully respects the spherical nature of the Earth, and (ii) involves a minimal ...
- 10.3k
3
votes
1
answer
86
views
Left and Right Handed Traffic
How can I generate a Geo plot similar to the Wiki page about left- and right-handed traffic.
Question
A direct way would be to make a list of countries that follow ...
- 56.1k
3
votes
1
answer
73
views
Latitude and Longitude values in GeoGraphics Image [duplicate]
I want to plot the Sicily with a lat/lon grid and respective values. This is what I've done so far:
...
- 960
7
votes
1
answer
145
views
How to add labels to GeoGridlines?
I'm trying to make a graph that looks like this:
This code gets close:
...
- 335
2
votes
0
answers
110
views
GeoNearest[] between current location and a list of GeoPositions[]: Documented example is not producing documented output
First off I am doing this for recreational purposes only, so it's not the end of the world if I cannot figure this out. I am trying to utilize the GeoNearest[] ...
- 5,042
6
votes
0
answers
108
views
3D region best way to create signed coastal distance?
As a test, I'm trying to create a signed coastal distance map of the world (assumed perfectly spherical), using the first 1800x900 image above, which I converted to the 2nd image above using ...
- 161
4
votes
0
answers
274
views
Inverse Mercator projection from plane to sphere
I made a Mercator map of the Earth like this:
...
- 65
3
votes
1
answer
105
views
How to combine multiple GeoGraphics with custom spacing
I have a GeoGraphics image with some countries drawn:
...
- 225
2
votes
1
answer
55
views
How to style land and borders in GeoRegionValuePlot
I am trying to create a GeoRegionValuePlot-like graph with:
Land coloured Red or Blue, depending on a numerical value.
Thin black borders around the states.
A white background, showing nothing but ...
- 225
2
votes
2
answers
200
views
How to paint world map with some data?
I have a dataset which associate each country to respective number, from a list with few countries, as shown below:
...
- 1,335
5
votes
2
answers
170
views
List of large cities in Pakistan
Bug introduced in 12.2.0 or earlier and persisting through 13.1.0
I am using v12.2.0-Win7-x64.
I have been experimenting with Geo* command syntaxes and came across ...
- 56.1k
8
votes
2
answers
203
views
Distance to the ocean
Given a GeoPosition, what is the recommended method to calculate its distance from the ocean?
EDIT
As an example, Atlanta is ...
- 56.1k
1
vote
1
answer
57
views
Mask failure message in GeoPosition?
I am trying to construct a variable in a dataset that calculates the distance from a point to a city/country listed in another variable. I hoped to use GeoPosition to get the approximate location of ...
1
vote
0
answers
33
views
Double BarLegend for Geo* plots
I am trying to create a GeoRegionValuePlot based interface and I have a few unresolved items. This post is mostly about the use of a double ...
- 56.1k
7
votes
1
answer
181
views
Using CityData[] vs. Entity for population
I am using v12.2.0-Win7-x64.
CityData[Entity[
"City", {"Shanghai", "Shanghai", "China"}], "Population"]
...
- 56.1k
3
votes
1
answer
313
views
How many people live in cities near the equator?
In order to answer this question, first I define a region around the equator.
eq = GeoBoundsRegion[{{-3, 3}, {-180, 180}}]
GeoGraphics[eq]
Next, I wanted to find ...
- 56.1k
4
votes
2
answers
130
views
4
votes
2
answers
118
views
GeoScaleBar on a GeoRegionValuePlot
Bug introduced in 12.2.0 and persisting through 13.1
I have selected the following minimal example from the documentation. I am running v12.2.0 Win7-x64.
...
- 56.1k
1
vote
1
answer
61
views
Show travel route of multiple destinations
Suppose I have a list of cities and I want to get a picture of how to get to every city in that list from a central location like St. Louis. It would loosely resemble bicycle spokes originating from ...
- 95
1
vote
1
answer
69
views
7
votes
1
answer
146
views
4
votes
1
answer
260
views
Accessing geometry in Shape files (SHP)
Shape files can readily be imported and converted to a Dataset. For large shape files, this may unnecessarily consume a large amount of memory, particularly when the dataset is only used to retrieve ...
- 5,222
1
vote
1
answer
94
views
Polygon for "Provence-Alpes-Cote-D'Azur, France"
While answering 168996 about "removing islands from geo regions", I made a few observations about the polygon associated with "Provence‐Alpes‐Cote‐d'Azur, France". The ideas was to ...
- 56.1k
6
votes
2
answers
213
views
Remove islands from geographic regions
I wish to get only the continental parts of countries when using GeoGraphics, for instance in
...
- 609
3
votes
2
answers
141
views
Solve for subset of parameters in ParametricPlot
I have a discretized region $\mathscr{R}$ and two functions $x(u,v)$ and $y(u,v)$. I wish to find (numerically of course) the values of $(u,v)$ such that
$$
\begin{align}
\left(x(u,v),y(u,v)\right)\in ...
- 609
2
votes
1
answer
93
views
Define functions on Geographic regions
Let's plot a parametric function $(x_s(u,v), \:y_s(u,v))$ on some $uv$ domain as shown below with an annulus as example.
...
- 609
4
votes
2
answers
237
views
Easiest way to obtain MeshRegion from CountryData
What is the easiest way to obtain MeshRegion objects from CountryData that I can use in geographic computations?
For example, ...
- 37.9k
27
votes
3
answers
2k
views
Animating battlefield data map of war in Ukraine
UPDATE on FINAL RESULT
Thanks to @SquareOne effort I generated higher-resolution videos with smoothing transitions that can be seen here:
https://www.linkedin.com/feed/update/urn:li:activity:...
- 73.5k