Tuesday, July 16, 2019

Gun Violence Trends in US States

The USA has one of the highest levels of gun violence in the first world. Not only is the level of gun violence in America shockingly high the number of gun deaths is actually rising in nearly every state.

The Nelson A. Rockefeller Institute of Government has released an interactive map which allows you to explore the trends in gun violence in every U.S. state from 2001-2017. Exploring the data in the Gun Violence Dashboard it appears that of the 50 states the only ones that saw a downward trend in gun deaths from 2001-2017 were California, New York, Hawaii, Arizona and Connecticut. The District of Columbia also saw a decline in the number of gun deaths during that period. Every other state appears to have seen a rise in the levels of gun deaths per 100,000 people since 2011.

The Gun Violence Dashboard visualizes a number of different measures of gun violence by state and by year. Not only can you explore the state trends in total gun deaths you can also view the levels of gun homicide deaths and gun suicide deaths. In terms of the overall number of gun deaths per population Alaska ranks the highest of all states. The rate of gun deaths in Alaska is almost ten times as high as that of Hawaii, which has the lowest rate. Alabama, Montana, Louisiana and Mississippi are, after Alaska, the states with the next highest levels of gun deaths.

Leaving America

The un-American President has opened his vile, racist mouth again. Among the best responses to his desperate attempts to destroy the principles of the United States is Flowing Data's If We All Left to “Go Back Where We Came From”.

Using a series of dot maps Nathan Yau visualizes a USA which has been de-populated of all the Americans who are the descendants of immigrants. The series starts with a dot map of the USA without all its non-Hispanic white people. Next to be removed from this map of America are all Asian and Black Americans. Thirdly Hispanics are removed from the map. The final dot map in the series shows the USA with only 2.1 million Native American and native inhabitants left.

The data for this series of dot maps comes from the 2012-2016 American Community Survey. In his article Nathan links to some other examples of dot maps. One dot map (which isn't linked to) is the University of Virginia's Racial Dot Map. This interactive dot map of the USA allows you to zoom-in on individual cities to explore their racial make-up.

Also See

The Racial Dot of Brazil
The Racial Dot Map of South Africa
The Racial Dot Map of Estonia
The Racial Dot Map of Australia

Mapping Italy's Manchurian Candidate

Vladimir Putin's favorite Italian politician, Matteo Salvini, has been in the news a lot this week. Last week Buzzfeed revealed that a close aide of Matteo Salvini held a meeting with three Russians. A meeting in which he discussed how to illegally channel tens of millions of dollars of Russian oil money to Salvini’s Lega party.

When Salvini isn't busy visiting Moscow or denouncing EU sanctions against Russia he is usually relentlessly campaigning around Italy trying to drum-up far-right support for his extreme political party. Visualize News has released an interactive map which tracks Matteo Salvini's movements based on his official Facebook page.

Matteo on Tour maps out all Salvini's visits around Italy (and abroad) since 2 June 2018. It includes a timeline which is synchronized to an interactive map. Click on any of the visits mentioned in the timeline and you can view the location visited on the interactive map. In total, since last June, Matteo Salvini has covered the same distance as 4 Forest Gumps. Let's hope that his next journey is a short trip to a long stay in prison.

Monday, July 15, 2019

San Francisco's Seasons of Fog

San Francisco is well known for its frequent fog. In fact San Franciscans are so familiar with this weather phenomenon that they are now on first name terms. The reason that San Francisco sees so much fog, especially in the summer, is that big expanse of water called the Pacific. The cold ocean waters of the Pacific cools the warm air above. Cool air doesn't hold as much moisture as warm air. The moisture therefore condenses as the warm air is cooled, creating fog.

In the mornings the sun begins to heat the land. Hot air rises and the cooled foggy air over the Pacific is sucked inland. As the day progresses the sun heats the air and San Francisco's fog is therefore (usually) burned off during the afternoon.

You can see this process very clearly on Fogust, an interactive map visualizing San Francisco's fog by month and time of day. The map uses historical data from NOAA's GOES-15 to provide a visual guide to the historical levels of fog experienced during different months and over the course of a typical day.

The map has three buttons for each month of the year. Judging by the map July and August seem to be the foggiest months. If you switch between the 10 am, 12 pm and 4 pm buttons in July then you can observe the process described above, as the the fog forms over the Pacific, rolls inland and then gets burned off in the afternoon.

OSM Coverage & Population Density

Disaster Ninja is a map of global population density correlated to OpenStreetMap density. It shows the number of OpenStreetMap objects mapped compared to the local population density. The map can therefore be used to quickly identify populated locations around the world which have not been fully mapped on OSM.

Disaster Ninja was initially developed to help disaster relief. The map can be used to quickly determine the level of OSM coverage compared to the local population after a natural disaster. It is therefore a useful tool for organizations such as the Humanitarian OpenStreetMap Team, who develop and use OSM map data as part of their disaster response and management efforts.

The Disaster Ninja interactive map uses a bivariate choropleth overlay to show the number of OSM map objects compared to the population per kilometer squared. The red areas on the map are locations which have a high population density and a low number of mapped objects on OSM. The red areas on the map are therefore locations which are likely to not be fully mapped on OpenStreetMap. At the other end of the bivariate scale are the light green areas. These are locations with a relatively small population and a large number of mapped objects.

At a glance India and China seem to be two areas of the world with a relatively high population density and low OSM map object count. The very high population densities in some areas of these countries may partly account for this. However some of the most densely populated areas, such as New Delhi, Mumbai and Beijing actually show up as green on the map and are therefore relatively well mapped on OSM.

Via: Weekly OSM

Map in European Languages

The map above shows the word 'map' translated into a number of different European languages. The continent is mostly divided between those who derive the word 'map' from Latin and those who derive the word from Greek.

The word for 'map' in English, Spanish, Portuguese, Polish, Czech and Serbian comes from the Latin 'mappa' for 'sheet' or 'napkin'. The word's use to describe a drawn representation of an area originates from the medieval Latin 'mappa mundi'. The literal translation of 'mappa mundi' is 'sheet of the world', from Latin mappa ‘sheet, napkin’ and mundi ‘of the world’ (genitive of mundus ).

Most other languages in Europe derive the word 'map' from the Greek word 'khártēs' (meaning map). These include the French, who use 'Carte', the German 'Karte' and the Danish 'Kort'.

In English, despite using a Latin derived word as the name for a map, we use a Greek word for the science or practice of drawing maps. The word 'cartography' comes from the French 'cartographie', from Ancient Greek 'khártēs' (map) + 'gráphō' (write). The other users of the Latin 'mappa' to describe a map (Spain, Portugal, Poland, Czechia and Serbia) also use a word derived from these Greek words (khártēs+'gráphō) to describe the actual science of making maps.

Sunday, July 14, 2019

City Neighborhood Quiz

How well do you know your global cities? Could you name a city just from a list of its central neighborhoods? Let's find out.

The maps below have had all road and building data removed. In fact the only thing left on these maps are the place-name labels of each city's central neighborhoods / boroughs. All you have to do is identify the city featured in each of the maps.

There are seven cities to guess in total.








Answers (highlight the text below to reveal the answers)

1. London
2. New York
3. Paris
4. Berlin
5. San Francisco
6. Los Angeles
7. Sydney

Saturday, July 13, 2019

Tracking Tropical Storm Barry

The National Hurricane Center (NHC) advises that Tropical Storm Barry has become a hurricane as it approaches Louisiana. They warn of "dangerous storm surge, heavy rains, and wind conditions occurring across the north-central Gulf Coast".

For the latest news on Tropical Storm Barry from the NHC refer to:

The NHC's public advisory on Hurricane Barry
The NHC's forecast advisory on Hurricane Barry
The NHC's forecast discussion on Hurricane Barry

CNN has compiled a number of resources related to the progress of Tropical Storm Barry. These include a storm tracking map, the latest satellite imagery and a number of forecast maps showing the predicted levels of precipitation, storm surges and wind speeds. The storm tracker interactive map shows the predicted path of Tropical Storm Barry and the estimated arrival times along its predicted path.

The National Weather Service says that the slow progress of the storm will bring a threat of flooding "along the central Gulf Coast, across portions of the Mississippi Valley and north into the Tennessee Valley." You can view where the NWS has current alerts in place on the National Weather Service map. Just click on any of the colored sections on the map to read the latest NWS alert for that location.

You can also follow Tropical Storm Barry on the Earth animated map. Earth animates the latest wind, precipitation and other weather conditions on an interactive map. Just click on the Earth logo to change the visualized weather layer or to switch to a different map projection.

Putting Water Fountains on the Map

Readers of Maps Mania are mostly very conscious of the effect of single-use plastic on the environment. Which is why they would presumably always prefer to use a reusable water bottle rather than a single-use plastic water bottles. When I leave my home in the summer I nearly always carry a re-usable water bottle. I actually now have a pretty good mental map of the location of water fountains which I can use to refill my water bottle. Of course this mental map only exists in places I know well. When I end up somewhere new I have to rely entirely on luck when looking for a water fountain.

Finding a nearby water fountain can be quite hard. Which is why you should bookmark water-fountains.org on your mobile devices. water-fountains.org is an interactive map which can help you find and discover water fountains close to your current location. The map shows the locations of potable water fountains with a small blue marker and non-potable fountains with a black marker. The map sidebar lists the nearest fountains in order of proximity to your current location. If you hover over a water fountain in this list its location will be highlighted on the map.

The map sidebar also includes a number of options which allow you to filter the results shown on the map. These allow you to view the locations of only potable water fountains or water fountains which are wheelchair accessible. It even allows you to filter the results by type of water (spring, ground water, own supply or tap).

Now for the bad news. Unfortunately at the moment water-fountains.org only works in New York, Geneva, Zurich, Lucerne and Basel. water-fountains.org does say to contact them if you would like to add your city to the map. Presumably they would look more favorably on your request if you were able to provide the location data yourself for the water fountains in your city.

If you live in Italy then you can use Fontanelle. Fontanelle maintains an interactive map showing the locations of drinking fountains in many Italian cities. Their cities on the map list includes information on how many water fountains have been mapped in each Italian city (and a link to the map showing the locations of all the city's water fountains).

Friday, July 12, 2019

Deforestation Supply Chains

Much of the deforestation of tropical rainforests around the world is being caused by agricultural expansion, mainly to grow soy & palm oil and to clear land to graze cows for beef. Trase wants to increase transparency around the supply chains of agricultural products in order to reveal the environmental and social risks of these products. One way in which Trase is increasing transparency is through mapping the supply chains of South American agricultural commodities from production to consumption.

The Trase Explore the Supply Chain map is a simple interactive tool which allows you to view the supply chains of a number of agricultural commodities from South American countries to the rest of the world. Select a product, a country and a year and you can view a flow map showing the volume trade of that product to other countries around the world for the selected year. The top exporting companies of that product are also listed beside the map.

The Trase Supply Chain Interactive Map provides a more detailed overview of the trade and supply chains of some of these agricultural commodities. This map allows you to explore in finer detail where these products originate from and the deforestation risk attached to their production. An accompanying sankey diagram shows the supply chain of the selected commodity, revealing the volumes traded by individual exporting and importing companies and the countries where the commodity is most consumed.