Table 1.

Notations used in Algorithm 1.

Notation	Description
A	Set of acceleration data
G	Set of geomagnetic data
f	The length of one frame which is 10 values (1 sec data at 100 ms sampling rate)
B	The building, where currently the user is in
$B_c$	The building candidates, where currently the user is in
N	The total number of floors in all buildings
$N_{bi}$	Floor i in building b
$E_{bi}^k$	Set of Euclidean distances between sample k and floor i of building b
m$E_{bi}^k$	The minimum of Euclidean distances between sample k and floor i of building b
$\widetilde{E_b^k}$	The normalized Euclidean distance for sample k and building b