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.
267
questions
3
votes
1answer
68 views
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,...
-3
votes
1answer
92 views
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
vote
1answer
74 views
Why does Entity Class return an empty value sometimes?
I am working on computing the 20 largest cities in California.
...
-1
votes
2answers
51 views
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 ...
-3
votes
1answer
49 views
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:
...
4
votes
0answers
53 views
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
vote
0answers
54 views
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 ...
3
votes
0answers
77 views
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 ...
3
votes
1answer
66 views
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 ...
3
votes
1answer
111 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, ...
3
votes
1answer
129 views
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 ...
3
votes
1answer
107 views
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:
...
2
votes
1answer
85 views
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:
...
1
vote
1answer
88 views
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
votes
4answers
2k views
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 ...
0
votes
0answers
23 views
4
votes
1answer
93 views
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.
...
14
votes
1answer
1k views
Are Mathematica's maps copyright-free?
Are the maps available in Mathematica copyright-free? For instance, if I generate the image
...
0
votes
1answer
41 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,
...
5
votes
1answer
77 views
Improving performace of `GeoDistance` and `NearestNeighborGraph`
I am trying to construct a NearestNeighborGraph of the 3143 US counties, using their latitude and longitude positions.
...
4
votes
1answer
71 views
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 ...
1
vote
0answers
88 views
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 ...
3
votes
1answer
68 views
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 ...
2
votes
0answers
66 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 ...
14
votes
3answers
4k 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 "...
0
votes
2answers
163 views
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
0answers
28 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 ...
0
votes
0answers
39 views
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 ...
4
votes
1answer
99 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
votes
1answer
160 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 ...
0
votes
1answer
47 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 ...
1
vote
1answer
31 views
GeoRegionValuePlot Leaving Out Metropolitan Census Tracts
Preamble
Run this code in the preamble for a working example of what I'm dealing with.
Census Tract Entity Store
...
3
votes
1answer
53 views
States surrounding/adjacent to a given state
I want a function that gives a list of all states adjacent to a given state. How can I do this in Mathematica?
1
vote
2answers
257 views
How to compute a list of cities within a given radius of another city?
I have hitherto found a solution to this problem.
Designate a city in the continental USA as cityCenter.
Make a table with all large cities in the USA. I could ...
2
votes
1answer
80 views
Is there any way to speed up many instance of TravelDistance
The goal of this code is to identify and graph a "circle of cities" about a center city.
...
0
votes
1answer
62 views
2
votes
1answer
182 views
How to draw line parallel to the coast on a world map?
The task is to draw a line parallel to the coast 150 nautical miles to the sea, highlighting the ocean between the coast and the line drawn.
An expected result is an image (most aesthetically pleasing)...
3
votes
2answers
116 views
Using Geo commands, how do I get a list of cities that all meet the following criteria
I am looking to list with Geo commands all the cities such that
Point is 333 miles from Houston
Point is 755 miles from San Antonio
Point is 460 miles from El Paso.
How do I write up the code that ...
3
votes
1answer
62 views
EntityClass Downloading Speedup
Running this command. Trying to get all cities more than 1 million people in US.
...
4
votes
2answers
102 views
How to plot countries with accurate area?
Are there any projections that use the true size of countries, like this?
1
vote
0answers
42 views
Use Wolfram Cloud to Create Site Visitor Database
Question: Is there a way to use Wolfram Cloud to create a web API function that, when pinged, does the following:
Gets the geographical location of the user (as an Wolfram entity, like ...
4
votes
1answer
127 views
Distance between two cities
I need help calculating the distance between 2 cities in Wolfram MAthematica. I would need to create two drop-down lists of European capitals. After selecting any two cities from the lists, I would ...
2
votes
0answers
117 views
How to smoothly zoom into GeoGraphics without label flicker?
I would like to animate zooming into maps in a smooth fashion while showing labels - but without them flickering or jumping:
...
0
votes
0answers
69 views
Simpler closed form for spherical coordinates of points on great circle?
Short version: how to simplify this expression given these conditions? Note that expr[[3]] is equal to 1, although Mathematica won't simplify it as such.
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5
votes
0answers
176 views
How to get 3D building data in map functions?
Most modern mapping APIs have 3D model data for city buildings built-in. For example:
Is there some way to get this functionality in the Geography related functions?
I believe ...
4
votes
0answers
65 views
Cloud Deploy dynamic country selection from a map
This is a follow-up question based on the answer I got from Lukas Lang. The original question is here. How can I alter the code to deploy it on the cloud? Or in case this method is only for desktop: ...
10
votes
1answer
391 views
How to dynamically select a country on a map using the cursor
Let's say I have a map of Europe with a locator in manipulate
Manipulate[ GeoGraphics["Europe", GeoBackground -> "CountryBorders"], {{p, {150, 150}}, Locator}]
...
4
votes
1answer
115 views
Blurry labels in GeoGraphics
I want to keep the same GeoZoomLevel, but increase the resolution of the labels. I'm struggling to control that:
...
2
votes
2answers
114 views
1
vote
1answer
100 views
Question about BorderingCounties
I start with:
escambiaFL = Interpreter["USCounty"]["Escambia county"]
Answer: Escambia County, Florida, United States.
Next; evaluate:
...