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| Re: De Blasio Want To Expand The Subway (1349226) | |||
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Re: De Blasio Want To Expand The Subway |
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Posted by Stephen Bauman on Thu Apr 23 16:57:50 2015, in response to Re: De Blasio Want To Expand The Subway, posted by AlM on Thu Apr 23 12:37:13 2015. Your mileage measurer consistently understates.First off, my statement is accurate as stated. You chose to interpret it to mean walking distance. I made no such qualification in my statement. The only relation between distance and walking was my statement that when a station entrance is within 1/2 mile, then walking is the fasted means of getting there. There was no linkage between the quickness of the journey to its actual distance. After a 40+ year engineering career, I know how to read and write specifications. :=) I use GIS to determine how close various locations are to subway entrances. There's an open data shape file that gives all subway entrances in NYC. I place the station entrances on a map and draw an 1 mile diameter circle around them. Any location that lies within one of these circles is within 1/2 mile of a subway entrance. A GIS isn't required to verify my statement. All one needs is a paper map and a compass. Set the compass to 1/2 mile according to the scale and draw circles around each subway entrance. GIS is a lot easier. 11th Ave and 19th street is a 0.8 mile walk to an 8th Ave subway station. One reason for not specifying walking distance is it depends on the chosen route. If one were so inclined, one could equate a minimax walking distance with the direct radial distance I've given. This is particularly easy for a rectangular street grid. The worst case is 45-45 degree right triangle. The hypotenuse is the radial distance and the sides are the cartesian path taken. The ratio of the distance is sqrt(2). For a half mile radius this means the longest walking distance should be 0.5 * 1.414 = 0.7071. That's considerably less than your figure of 0.8 miles. What's more surprising is that 11th Ave is no longer on the rectangular grid. It's moving closer to 8th Ave as it moves south. Using the Google Maps ruler tool, the distance between 19th St and 11th Ave is only 3103.58 ft to the subway entrance at the NW corner of 15th St and 8th Ave. That's measured by walking down 11th Ave to 15th and then going across 15th St to 8th Ave. That's 0.59 miles which is a lot closer to the 0.5 mile distance from a subway entrance than your walking distance estimate of 0.8 miles. That doesn't make your argument inherently wrong, but trying to support it with bad evidence doesn't help. I agree :=) |
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