Posts Tagged ‘first order admin’

Natural Earth Vector Preview: Cities (Part 2)

Thursday, November 12th, 2009

Announced at NACIS in Sacramento, California in October, we’re closing in on final release of Natural Earth vector and raster map data.

Bill Buckingham wrapped up processing the Natural Earth Vector cities (populated places point locations) this week. I’ve been honing our admin-1 and admin-1 rankings and feature names (only 4,000 states and provinces around the world, wew!).

Bill’s added population estimates for each city based on LandScan. The technique allows the user to know both the relative “regional” importance of a town, regardless of it’s population, based on which map scales the feature should be visible (thanks to Dick Furno) at AND to know how many people live there.

By taking a composite of both, you can still show small population cities that are regionally important at a small type point size along with larger populated places at the smaller map scales.

We have about 6,500 cities in Natural Earth Vector. Over 90% of those have population estimates (the ones that don’t are usually out in the boondocks). Together, our cities capture over 3 billion people or half of humanity.

For comparison, most other populated place GIS files have only 2,000 some cities and they focus on country and first order administrative capitals with a bare smattering of other towns. For instance: Lagos, Nigeria or San Francisco, California.  This makes smaller countries with lots of administrative divisions (like Slovenia, Vietnam, or Jamaica) seems way more populated than larger countries with larger administrative divisions (like the United States). See the North America screenshot below for an example and look at the Caribbean versus United States.

They also don’t estimate populations, and if they do they use official census number that hide the true “metro”-style counting of people that should inform a thematic map regardless of formal administrative boundaries at the smaller map scales that Natural Earth excels at.

Now for some screenshots:

(Scale ranks, followed by population view color coded like the scale ranks with nodata green dots, then cyan dot version is ESRI cities overlayed)

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0world_population

1no_amer_ranks

1no_amer_population

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2us_ranks

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More continents o’ dots after the jump.

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Old Troubles Threaten Again in Bosnia (Wash Post)

Tuesday, August 25th, 2009

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[Editor's note: Before working on Natural Earth Vector, I had no idea Bosnia was composed into two countries awkwardly joined into one state. As the following article from this Sunday's Washington Post explains, the war that ended 14 years ago did little to solve the conflict. Map by Gene Thorp using Landscan population estimates at 1km grid resolution, mashed up with ethnic distribution map by administrative district.]

Republished from The Washington Post.
By Craig Whitlock. Sunday, August 23, 2009

14 Years After War, Leaders Suggest U.S. Should Step In to Rewrite Treaty

SARAJEVO, Bosnia — Fourteen years after the United States and NATO intervened to stop war and ethnic cleansing in Bosnia, the old divisions and hatreds are again gripping this Balkan country.

In June, the international envoy who oversees the rebuilding of Bosnia invoked emergency powers that he said were necessary to hold the country together. Although U.S. and European officials have been trying to get Bosnia to stand on its own feet for years, many Bosnian leaders say the only thing that can permanently fix their gridlocked government is for Washington to intervene — again — and rewrite the treaty that ended the war in 1995.

Continue reading at The Washington Post . . .

PREVIEW Natural Earth Vector: First Order Admin Units

Monday, July 13th, 2009

We shipped off the 1:15,000,000 scale first-order administrative units for Natural Earth Vector to University of Wisconsin @ Madison to be attributed with country and province names and alpha-numeric codes last week. There are only 3,000+ of these around the world so this is no small task! Kudos go to Tom for doing the heavy lifting on this data theme. Props to Kevin and Ben @ UW-Madison for undertaking the attributing.

Some units are super tiny (see Slovenia in the Europe detail at bottom, almost equivalent in scale to municipalities in the USA). We ignore some small, mostly island nations (see the Caribbean image below) but will include a general admin_0 polygon for the entire country instead. First order administrative units are composed what most people call “provinces” and “states” (not to be confused with countries aka “states”). For some countries, we will also include 1st order admin “regions” that group smaller 1st order units into larger statistical areas (eg: the United Kingdom’s England, Scotland, Wales, and Northern Ireland).

If you have 10 to 20 hours to spare, we need your help to complete Natural Earth Vector. Please email me at nathaniel@kelsocartography.com to find out more.

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