1. Calculation of commuting-distances in ArcView 3.x
Michael Berg Rasmussen
Statistics Denmark

2. Register-based labour force statistics (RAS statistics)
RAS contains:
Adress of residence
Adress of workplace
Commuting-statistics today:
how many people working in a municipality are coming from another municipality
how many people living in a municipality are working in another municipality
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3. Register-based labour force statistics (RAS statistics)
…but if we could get to know the distance people actually have to travel from their residence to their workplace, it would be much better
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4. Materials for making commuting-calcultions
RAS (Adresses of residence and workplace)
KDV (Digital network of roads)
Network Analyst for ArcView 3.x
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5. Possibilities with Network Analyst
Network Analyst measures out the shortest route by car between two adresses through a network of roads
The routes are measures one at a time
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6. Many at a time Two AvenueScripts
Script1: Geocodes all the addresses by the postal address and returns the x,y-coordinates
Script2: Geocodes the adresses of residence and workplace by the x,y-coordinates and returns the roaddistance between them
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7. No solution without irregularities!
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8. Problems with the workplaces in RAS
But sometimes they look like:
(people working in another country)
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9. Problems in KDV - The attributes
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10. Problems in KDV - Technical mistakes (1)
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11. Problems in KDV - Technical mistakes (2)
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12. Problems in KDV - Technical mistakes (3)
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13. The calculations can begin!
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14. Step 1
All adresses of residence and workplace are geocoded by their postal adress and their x,y-coordinates are returned
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15. Step 2
All residence-/workplace-relations with coordinates have their mutaul road-distance calculated
90.4 % of all residence-/workplace-relations are now calculated
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16. Step 3
BAK-coordinates (free download from the homepage of KMS) are joined with the adresses which did not get a coordinate-value in step 1
BAK-coordinates must be transferred to a point (RoadCenterPoint) on a road
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17. Step 4
Residence-/workplace-relations involving BAK-coordinates are calculated
91.5 % of all residence-/workplace-relations are now calculated
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18. 91.8 % of all residence-/workplace-relations are now calculated
Step 5
Bigger workplace > 100 employed are manual found by searching in KDV
91.8 % of all residence-/workplace-relations are now calculated
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19. Municipality-center of gravity Average(X),Average(Y)
Step 6
Municipality-center of gravity for residence and workplace are calculated
Municipality-center of gravity =
Average(X),Average(Y)
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20. Municipality-center of gravity for residence and workplace
The coordinates for the centers of gravity are used where an adress for some reason are without coordinates or are situated inaccessible for distance-calculations
F.ex workplace-adresses
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21. Step 7
The remaining residence-/workplace-relations are calculated in this way
99.7 % of all residence-/workplace-relations are now calculated
The remaining relations are people working in a foreign country
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22. Main result
People in Denmark travels on an average 15½ km in order to go to work from their residence
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