A Framework for Spatial Interaction Analysis Based on Large-Scale Mobile Phone Data

Algorithm 2

Transformation of geographic coordinates.

(1)  Input                    Mobile subscriber:

(2)                                    Set of logs in chronological sort:

(3)                                               

(4)                                    The approximate size of cells:  m

(5)                                    The boundaries of Shanghai administrative jurisdiction:

(6)                                               ,   

(7)  Output                The transformed mobile phone data of mobile subscriber :

(8)                                               

(9)  Procedure        Raster

(10)

(11) /^* Determine the fix interval of longitudes and latitudes, where is the average

(12) radius of the earth. ^*/

(13) ,

(14) /^* Transform each BTS into the equivalent BTS located at the cell’s centroid. ^*/

(15)

(16) while do

(17)          

(18)          

(19)          

(20)