A call for a "Unified
Metropolitan Mobility Score"
Ever since the modern GIS (Graphical Information System) database
came into being, there has evolved a need to determine how
accessible a land area is. In the metropolitan region this can
mean how accessible a location is to : Walk to, Reach by ferry,
Reach by Tram, Reach by Train or Subway ... etc.
Mostly current technology relies on existing databases from such
entities as Google Maps, Microsoft Earth, or any number of
existing national GIS databases that have an online mapping
component and API (Application Programming Interface) that is
accessible to the general public or software of website
The current problem
A walkability number (or transit friendly number)
completely fails to account for real world conditions such as
Winter, Adverse Weather, Crime, ... and the current walkability
and transit numbers only seem to work with the limited datasets
for GIS object location available.
A possible solution
The walkabiliy number is just an integer, limited from 1 to 99. It
has no other component.
Complex numbers (a+bi) are better suited for conveying variable
conditions as the number has more components.
Touples (like the [x, y, z] coordinate pairs) might also be more
suitable -- providing that there no more than 3 of them.
Coupling Walking and Transit accessibility numbers to ultimately
determine the reachability of an area must be a simple
mathematical process that should be possible to do with only
knowledge of Addition or Subtraction or the Average() function.
Most importantly, the algorithm must be
- OPEN SOURCE
- Computable on smaller devices : such as Smartphones,
The mechanics of the unified walking number
Notable rules that must be followed in encoding a 2nd or 3rd
1. How does the terrain behave for the pedestrian or bicyclist or
transit commuter IN WINTERTIME (in the Southern Hemisphere,
- These factors lower accessibility of
a physical land space
- Slope (in Winter, this should really lower a score of a
- Snow (unless it is in an area where it is only a freak
- Days of snow per year
- Average depth of snow in Fall, Winter, Spring
- Hours of Sunlight in a day
- Crime against persons (property crime is mostly not a direct
threat to the walker of bicyclist).
2. How does the civil engineering of a physical metropolitan space
make it less accessible for walking, biking or commuting?
What is walkability, bikeability
or transit accessibility?
- Integers : the base unit the 'Mobility Score' should use.
Floating point numbers should not be used so as to avoid
- Complex Numbers : a more advanced way of encoding a number.
- Touples : another way of encoding complex numerical ideas.
- Heatmap : how the accessibility of a geographical region is
typically encoded for easy visual comprehension.
- GIS Database
- Parsing rules related to GIS data : 1 2 3 4 5
Walkability Score website
|01 May 2012
|28 August 2013
|29 August 2013