Geography Reference
In-Depth Information
Fig. 4
Submission of an object
5.3.1 Submission
Figure
4
demonstrates what must be done to submit a text note. Before the sub-
mission screen the user can align a red cross to the point on the map, where the
object is to be placed. Figure
4
a, b demonstrate the submission procedure.
5.3.2 Retrieval
Figure
5
shows the process of retrieving surrounding notes. The default radius is
1,000 m, but this may be changed by the user. Figure
5
b gives an idea of what the
map view could look like after the recovery has been successful and reloaded the
map view with the new objects (represented by fine red ''bubbles'').
5.3.3 The Distance Calculation
This section briefly explains how we determine if a note is within viewing range or
not. The following attempts to describe the process of calculating the distance
between a note and the device.
Every note has its own radius and location attribute assigned. The device has its
own location and collects the radius from the user input. That means the server has
the information of two circles including their location as GPS coordinates. If the
