Monday, December 11, 2017

Guns Across State Lines


New Jersey has some of the most restrictive firearm laws in the country. Unfortunately for New Jersey most of the other 49 states aren't so fussy about selling guns. That might be why 79% of guns in New Jersey recovered and traced by the Bureau of Alcohol, Tobacco, Firearms and Explosives were bought out of state.

Axios has mapped the ATF's Firearms Trace Data - 2016 to show the top ten out of state sources for firearms for each U.S. state. The interactive flow map in How guns move across state lines visualizes the top ten out of state sources for recovered and traced guns in each state. If you hover over a state you can see how many guns were traced by the ATF in that state in 2016. You can also see the percentage which were originally purchased out of state and the ten states where the most guns were originally purchased.

If you want to make your own interactive flow map then you might be interested in Sarah Bellum's Canvas Flowmap Layer for ArcGIS or the Leaflet.Canvas-Flowmap-Layer.

The Geography of Long Life


Female babies born in the UK this year can expect to live until they are 85.8 years old. If they are male then they can hope to live until they are 82.3 years old. However a new born's life expectancy can vary a lot depending on where they live in the country.

The UK's Office for National Statistics has released information on the Health State Life Expectancies 2014 to 2016, which examines life expectancy in each area of the UK. This ONS report includes two interactive maps; one visualizing life expectancy in each local area in the UK and the other showing the gain in life expectancy in each local area since 2001-2003.

Healthy life expectancy at birth can vary across local areas of the UK by 18 years. The best places to live if you want a long healthy life is Richmond upon Thames if you are male (69.9 years) and the Orkney Islands if you are female (73.0 years). The worst places to live are Dundee City for males (54.3 years) and Manchester for females (54.6 years).

Sunday, December 10, 2017

The First #uksnow of Winter


It's snowing! There's nothing quite like the excitement of waking to the first snow of winter, grabbing your phone and visiting the #uksnow Map.

The #uksnow Map maps the location of snow in the UK based on the number of tweets that mention snow. To add snow to the map you just need to include the hashtag '#uksnow' in a Twitter message and a UK postcode. You should also rank the amount of snow out out of ten (where 0/10 = no snow and 10/10 = a blizzard).

The #uksnow Map includes an option to view all the photos of snow that have been posted on Twitter. Just click on the photo icon attached to the Twitter sidebar and thumbnails of the photos will appear in the sidebar. Just click on any of the thumbnails to view the image in full-size.

Now where did I put put my sledge?

Saturday, December 09, 2017

Trees of Edinburgh


The Edinburgh Tree Map uses data from a number of sources to map Edinburgh's trees. The map uses colored map markers to show the locations of the city's trees by species.

Using the map menu it is possible to view individual tree species separately on the map or to view all species at once. If you select a tree on the map you can view its Google Maps' Street View image and details about the tree's height and age. Each tree also has its own unique URL (click on a tree to get its link), which means you can share a link to any tree on the map.

The Edinburgh Tree Map was built using Leaflet.js and the Carto Maps API. If you don't want to build your own map and database then you can create a tree map with OpenTreeMap, a paid service which was used to create the Los Angeles and San Francisco tree maps (linked below)

Other Tree Maps:

San Francisco
New York
Los Angeles
London
Melbourne
Madison, Wisconsin

Friday, December 08, 2017

The Most Fragile Cities Around the World


Three of the most at risk cities in the world, Mogadishu, Kismaayo, and Merca, are in Somalia. At the opposite end of the scale Canada, Japan and Australia are home to some of the least at risk cities.

Fragile Cities is an interactive map which allows you to explore the fragility of 2,100 cities around the world. The Fragile Cities project ranks cities using 11 different metrics, which consider areas such as income inequality, natural & man-made risks and access to services.

If you select a city on the map you can view its Fragile Cities fragility rank. You can also view how it ranks under all 11 of the fragility metrics. The map includes a number of themed map visualizations which provide a closer view of the fragility hot-spots around the world. The slide control at the bottom of the map also allows you to view the cities' fragility ranks for every year since 2000.

The Best Transit Networks in America


New York has the best transit network for commuters. San Francisco comes in a close second. However the transit networks in Cincinnati and Charlotte showed the most improvement in the last year in terms of providing the greatest increases in access to jobs by transit

Every year the Accessibility Observatory at the University of Minnesota ranks the most populated towns and cities in the United States according to how well they connect workers with jobs via transit. Essentially the rankings are based on how many jobs can be reached by employees in a given time.

This year’s report Access Across America: Transit 2016 shows the rankings for each city, listing the cities in order of the greatest job accessibility by transit. It also lists the cities which have shown the best year-on-year improvement. These are the cities with the greatest increases in job accessibility by transit.

The report is accompanied by a series of interactive maps which visualize the spatial patterns of accessibility within each city. For each city an interactive heat map show the number of jobs accessible in each census block area within 30 minutes (on public transit) between 7:00 and 9:00 am.

Town vs Country


German newspaper Zeit has noticed a divide in attitudes in many western countries between their rural and urban communities. This divide in attitudes was seen clearly in the last presidential election in the USA and in the UK's Brexit referendum. In both these cases there were clear differences between the way urban and rural communities voted.

Zeit Online therefore decided to find out if there was this same urban-rural split in attitudes in Germany. In Diving into Urban-Rural Prejudice the newspaper first set out to discover how many Germans live in the countryside and how many in towns and cities. They discovered that "almost 70 percent of all Germans live in places with a population of less than 100,000". Zeit has visualized this answer in a dot map and bar graph, which shows the percentage of Germans living in different sized communities.

In the rest of the article Zeit explores the attitudes of urban and rural communities to a number of social and political questions to discover if there really is a difference in attitudes between town and country. The newspaper discovered a number of areas where there are clear differences in social and political attitudes. It also discovered that some of these seem to have grown in recent years (perhaps in response to Germany's acceptance of a large number of refugees).

Thursday, December 07, 2017

Southern California Fires Maps


Two fires erupted overnight in Southern California. The Thomas fire in Ventura County has already burned 90,000 acres and threatens communities both on the coast and inland. The Creek fire is burning near Sylmar and has prompted officials to evacuate more than 8,000 homes. Authorities say that the fire may not be fully contained for two to three weeks.

Esri's Ventura Wildfires map displays active fire incidents and situation reports from the National Interagency Fire Center (NIFC) database. The map also includes the MODIS thermal layer. This uses the MODIS satellite detection system to show the location of hot spots that could be potential fire locations, as detected by MODIS in the last 24 hours.

You can also view the same information on Esri's US Wildfire Activity Public Information Map. This second map covers the whole of the United States, while the first map is concentrating on the current active fires in Southern California. The US Wildfire Activity Public Information Map visualizes US wildfire locations, perimeters, fire potential areas, global burn areas, wind conditions, and precipitation using a variety of different official sources. This map also includes news & media concerning wildfire activity taken from social media.

A Journey Along a Greenland River


The New York Times wants to take you on a journey down a Greenland river. A journey which helps explain how melting ice sheets can cause a rise in global sea levels. In Greenland Melts, Where's the Water Going? the NYT uses drone photos of Greenland to help explain how meltwater rivers flow through the ice sheets and into the sea.

As you scroll through the story map you are taken on a journey along a Greenland river. On this journey you will experience how meltwater from Greenland's ice collects and drains to form rivers. You will see how these rivers carve a path through the ice sheet and how the rivers eventually drain into the ocean and contribute to rising sea levels.

After you have finished this journey along a Greenland river the New York Times discusses the importance of new research which suggests that the ice sheets retain some of the meltwater from melting ice sheets. This new discovery should help improve climate scientists' understanding of rising sea levels and help to refine our climate models.

You may also like:

Sea Level Rise Viewer - NOAA's interactive map models how different extents of sea level rise will impact coastal areas in the USA up to the year 2100.
Rising Seas - a map which allows you to explore data from 500 sea level meters around the world which have been measuring sea levels since 1933.
Shrinking Glaciers Around the World - a collection of maps tracking how glaciers are shrinking across the globe

Wednesday, December 06, 2017

Mapping Rent in L.A.


The Los Angeles Times has mapped out Where You Can Afford to Rent in California. Using the newspaper's new interactive map you can view all the zip-codes in the state where you can afford to live based on your annual salary.

The L.A. Times' affordable rent map includes a slide tool which allows you to enter the amount of money you can spend on rent a month. After you have entered how much rent you wish to pay the map automatically updates to show where you can afford to rent. Each zip-code area is colored by affordability, based on the rental listings on Zillow.

You can also enter your salary into the tool. If you enter your salary then the map also tells you what percentage of your wage is being spent on rent. The L.A. Times suggests that "you spend no more than 30% of your gross income on rent and utilities".