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The New York Times put out a good interactive map on New York’s 1811 Commissioners’ Plan for the city. You can adjust the slider to move between the current map and the 1811 map.

The article recounts the 200th birthday of the plan–“the single most important document in New York City’s development.”.

The Plan basically overlaid a 200 ft x 600 ft. grid over Manhattan island–regardless of topography of the island. It in fact was a reason that many of the hills of New York City were leveled. The basic parcel size in each block is 25×100. 2,000 blocks total.  With the plan, the merchant leaders of New York wanted predictability and they wanted a block that was conducive to commerce and development. What resulted isn’t one of beautiful vistas, some even call it monotonous, but it has worked well and efficiently. The grid takes a back seat to the people and the buildings of the city.

“The 200-foot-long block is short enough to provide continuous diversity for the pedestrian, and the tradition of framing out the grid by building to the street-wall makes New York streets walkable and vibrant,” said Amanda M. Burden, the director of city planning.

But some have reservations. Tony Hiss, author of “In Motion: The Experience of Travel,” said that while the grid contributes orderliness, “I still think it distances us from our natural surroundings, and it has given us a slightly spurious and diminished mental geometry.We think more in terms of linear blocks than neighborhoods.”

In its recently published Making Room for a Planet of Cities, The Lincoln Institute of Land Policy complimented the plan, along with Cerda’s plan for Barcelona, for being farsighted. The 1811 Plan expanded the city by five times. Making Room says that cities should at least consider that more growth will occur than expected; it doesn’t hurt to plan for the possibility when the consequences for under planning are quite worse. Both the 1811 plan and the Barcelona plan are grids and the grid is easily extend-able, making it easy to accommodate future growth. The Lincoln land Institute’s point is that you do not need to commit to building infrastructure and streets now, just say that if the city does expand, this is where the streets would go, so don’t put buildings on what may in the future be streets.

I think lessons can be learned here in China, where some cities are underestimating population growth, or being told to underestimate population growth. The result is a constant reworking of the plan to catch up.

See the Wall Street Journal Blog entry for many other fun maps relating to Manhattan:

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The following list from about.com shows what cities were the most populous cities at particular times in history. The webpage also has links to the top ten cities in (for example) the year 100. I tink some numbers my be wrong, because I thought Tang dynasty Chang’an was about 1 million people.

City Year
Became #1
Population Information
Memphis, Egypt 3100 BCE Well over 30,000
Akkad, Babylonia (Iraq) 2240
Lagash, Babylonia (Iraq) 2075
Ur, Babylonia (Iraq) 2030 65,000
Thebes, Egypt 1980
Babylon, Babylonia (Iraq) 1770
Avaris, Egypt 1670
Memphis, Egypt 1557
Thebes, Egypt 1400
Nineveh, Assyria (Iraq) 668
Babylon, Babylonia (Iraq) 612 First above 200,000
Alexandria 320
Pataliputra (Patna), India 300
Changan (Xi’an), China 195 400,000
Rome 25 450,000 (100 CE)
Constantinople (Istanbul), Turkey 340 CE 400,000 (500)
Ctesiphon, Iraq 570
Changan (Xi’an), China 637 400,000 (622); 600,000 (800)
Baghdad, Iraq 775 First over 1 million; 700,000 (800)
Cordova, Spain 935
Kaifeng, China 1013 400,000 (1000); 442,000 (1100)
Constantinople (Istanbul), Turkey 1127
Merv (Mary), Turkmenistan 1145 200,000 (1150)
Constantinople (Istanbul), Turkey 1153
Fez (Fes), Morocco 1170
Hangzhou, China 1180 255,000 (1200); 320,000 (1250)
Cairo, Egypt 1315
Hangzhou, China 1348 432,000 (1350)
Nanking, China 1358 487,000 (1400)
Beijing, China 1425 600,000 (1450); 672,000 (1500)
Constantinople (Istanbul), Turkey 1650 700,000 (1650 & 1700)
Beijing, China 1710 900,000 (1750); 1.1 million (1800)
London, United Kingdom 1825 First over 5 million; 1.35 million (1825); 2.32 million (1850); 4.241 million (1875); 6.480 million (1900)
New York 1925 First over 10 million; 7.774 million (1925), 12.463 million (1950)
Tokyo 1965 First over 20 million; 23 million (1975)