Questions tagged [geography]
Questions on the application of Mathematica to geography, including the use of the CountryData and CityData functions. Not to be confused with geodesy.
286
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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.
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- 79
1
vote
1
answer
42
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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.
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- 4,090
5
votes
1
answer
245
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Using AI to get the geographic locations of a list of banks
I have a list of banks from Bloomberg, and am looking to locate them on the world map,
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- 1,937
1
vote
1
answer
136
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What's the function to find a city nearest to a given latitude?
I have recently started programming in Mathematica and I am currently struggling to find a way to locate the nearest city based on a given latitude. I have looked into ...
- 33
1
vote
2
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178
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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 ...
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3
votes
1
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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:
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- 940
2
votes
0
answers
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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[] ...
- 2,654
2
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1
answer
153
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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:
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- 1,335
5
votes
2
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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 ...
- 37.8k
8
votes
2
answers
178
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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 ...
- 37.8k
1
vote
0
answers
32
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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 ...
- 37.8k
3
votes
1
answer
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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 ...
- 37.8k
6
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1
answer
170
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4
votes
2
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120
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7
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1
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131
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6
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2
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201
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Remove islands from geographic regions
I wish to get only the continental parts of countries when using GeoGraphics, for instance in
...
- 711
3
votes
2
answers
140
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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 ...
- 711
2
votes
1
answer
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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.
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- 711
2
votes
0
answers
61
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Crop or mask geographics
I am trying to crop a map drawn with GeoGraphics. The map consists of Line and Polygon ...
- 403
5
votes
2
answers
218
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Location of the point on Earth with the Sun at the zenith
This should be an easy question, but I don't know the correct syntax.
I'm trying to create an animation based on NightHemisphere during a year. For each day, the instant correspond to the time of the ...
3
votes
1
answer
84
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How to find all coastal cities globally using the Entity framework?
It seems to be an easy task as all the related functions GeoNearest and EntityList["City"] are close at hands.
However,...
- 4,317
-3
votes
1
answer
107
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How to find the distances to all buildings quickly?
I would like to create an association by mapping the function GeoDistance[Here,#]& over all buildings without missing locations in a reasonable amount of time less than 30 minutes.
I have the ...
- 1,653
1
vote
1
answer
82
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Why does Entity Class return an empty value sometimes?
I am working on computing the 20 largest cities in California.
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- 1,653
-1
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2
answers
72
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How to extract entities from TravelDirectionsData?
I am wondering how to extract entities such as states and cities from TravelDistanceData.
For example, given the following example from the documentation, how could I extract the states the route goes ...
- 1,653
-3
votes
1
answer
68
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How to disable legends in GeoListPlot and other geographic functions? [closed]
How can I hide or disable the automatic legend feature of GeoListPlot?
I have the following code and results:
...
- 1,653
4
votes
0
answers
87
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Accelerate the retrieval time for Entity data
I like to use Mathematica to answer questions related to cities such as how many cities in the United States have a population greater than 100,000 and what the distribution of them would look like on ...
- 1,653
1
vote
0
answers
77
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How to find N most populous cities in each state with TakeLargest and Entity Functions without waiting forever using Caching?
I am interested in using Entity Functions such as EntityValue, FilteredEntityClass, EntityFunction, EntityClass, EntityList, and GeoEntities to help me find N most populous cities in each state. I ...
- 1,653
3
votes
0
answers
97
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Calculate the nth percentile height above sea level of a country or US State
Mathematica has access to geographic height data for different territories. This can be used to plot sea level rise maps. However I am interested in what percentage of the area of a country or state ...
- 206
3
votes
1
answer
99
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How to use `Quantity` to convert Degrees of Latitude into Kilometers?
I want to convert 0.018 Degrees of Latitude into kilometers using the Quantity function in Mathematica. Unfortunately I do not know what Degrees of Latitude are ...
- 7,349
3
votes
1
answer
124
views
How Color the PathGraph Showing Multiple Shortest Paths on the US Counties Map
Below is code for mapping the connectivity of US counties. It comes from the Mathematica reference on "Connectivity of US Counties". I've highlighted 3 shortest paths shown in red. However, ...
- 1,553
4
votes
1
answer
237
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Plot a Map of German Bundesländer with specified colors assigned to them
I would like to draw a map of the German states ("Bundesländer") with Mathematica 12.
I found examples how to outline countries. But I need the next smaller levels.
I have not found anything ...
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3
votes
1
answer
112
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Is it possible to get a graph for Taiwan water area
I tried to get a graph for water area in Taiwan, but somehow it doesn't seem to work:
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- 241
2
votes
1
answer
99
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Can a ListPointPlot3D be overlayed with map
I am trying to make a graph of earthquakes (position and depth) shown on map of the country. The map is drawn with Graphics3D option with the code:
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1
vote
1
answer
97
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How to output Polygon with latitude and longitude set in EntityValue function?
I used EntityValue to represent a map of a country.
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12
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4
answers
2k
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How can we find the longitude that cuts all the land on Earth in half?
Mathematica has already a specific function, RegionCentroid, that can be utilized to calculate the geographic center of any region. As it has been discussed in here ...
- 930
4
votes
1
answer
102
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How to show net income geographically of a company in a certain city
Let's say that I have a company, and I already extracted it's net profit with time series.
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- 241
15
votes
1
answer
1k
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Are Mathematica's maps copyright-free?
Are the maps available in Mathematica copyright-free? For instance, if I generate the image
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- 4,187
0
votes
1
answer
49
views
How to prevent small locations from being plotted as points when using GeoListPlot?
When a location is too small, GeoListPlot marks that location using a point on the map. For example,
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- 67
5
votes
1
answer
108
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Improving performace of `GeoDistance` and `NearestNeighborGraph`
I am trying to construct a NearestNeighborGraph of the 3143 US counties, using their latitude and longitude positions.
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- 18.2k
4
votes
1
answer
91
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mapping a digraph across sectors of countries
Given a (9,9) matrix representing three countries (for example, the US, China, Russia), each one of which has three sectors (vertices/sectors {1, 2, 3) for the US; {4, 5, 6} for China; and {7,8,9} for ...
- 5,303
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0
answers
94
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OceanData not deep enough or just too deep for me?
It's exciting to see Mathematica/Wolfram Alpha addressing the marine realm in Version 12.2. Evidently, I was unaware that such data existed since Version 12.0 introduced in 2019. However, I have two ...
- 1,704
3
votes
1
answer
83
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How to determine population from a list of arbitrary jurisdictions (cities, states, counties, et al.)?
I am an aspiring data scientist who's working on a passion project, namely to assign danger-level scores to police departments in the United States.
One specific metric I'm developing results from ...
- 31
2
votes
0
answers
70
views
Where can you get by walking half a mile?
I recently saw that Mathematica 10 introduced really nice tools for geography. I would like to use GeoGraphics to visualize all possible paths with a length of half ...
- 1,134
14
votes
3
answers
5k
views
Oak Island, extending the "Alignment", possible Great Circle?
During these days of COVID, I indulged in the guilty pleasure of watching The Curse of Oak Island - Season 8, Episode 4 Alignment, which viewed last night (1 Dec 2020).
During the episode, some "...
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0
votes
2
answers
246
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Get coordinates of the boundary of a continent
I'm trying to obtain the coordinates of the border of the continents. I need this information to be ordered such that when I do, for example,
ListLinePlot[data]
It ...
2
votes
0
answers
32
views
Difficulty with getting local GeoPosition correctly
I am using the wolfram cloud on a Chromebook and when I type the function Here it returns a faulty ...
- 1,147
0
votes
0
answers
42
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Shifting GeoRange depending on Projection Problem
It's been rather smooth progress lately using GeoGraphics as I attempt to render different polygons over the greater metropolitan Vancouver area. I found this ...
- 1,076
4
votes
1
answer
117
views
Heatmap, visualizing on negative/positive values with Cartography
I want to create a heatmap in relation with a CityMap.
A example of my dataset is:
...
- 2,585
2
votes
1
answer
233
views
3D Plot of mountain elevation on a map
I am trying to plot mountains' elevation on a map. Right now, I have a 2D image generated using the code as shown below. I hope to create a 3D plot, on which, at z=0 is the map, and at each coordinate ...
- 407
0
votes
1
answer
64
views
GeoGraph based on (x,y)-coordinates
To create a Geograph we use a longitude and latitude to visualize the exact positions. I work with a database without the lon/lat. Instead of that, my database has a X and Y coordinate. I know, there ...
- 2,585