Geography Reference
In-Depth Information
Fig. 11 Overlay layer, the
different views
other parts of the applications, in such a way as to not overload the main activity
handling the sensory data.
There are two sensor readings that are of interest for calculating the device
orientation. These are accordingly: the accelerometer readings and the magnetic
field readings. The results are three values called Azimuth, Pitch and Roll.
7.5 Accelerometer Data Collection
The latest augmented camera application accelerometer data was recorded using a
HTC Desire 8181 mobile phone. The HTC Desire accelerometer is a Bosch
BMA150 Triaxial, digital acceleration sensor (Bosch
2011
). The Device restricted
the accelerometer sample rate to 23 Hz ±10 % with a ±2 g acceleration range.
The accelerometer X, Y, and Z axes data were recorded to nine decimal place
precision with a time-stamp of the actual sample time in milliseconds and then
passed on for further processing. Note that every mobile phone model could have a
different
accelerometer
sensor
built
in,
therefore
every
phone
may
perform
