f objects in map data, which are Point Data, Road Data and Region Data. Each object will have a unique object identifier called “objectID”. A Point data shows a location for an object such as Restaurant, Shop, Education or Public Service. Any other type of objects will be classified as Others. A Point

MapOnMe (MOM) is a company that aims to provide a local spatial data that can be used to
analyse urban movement behaviour. For this purpose, this company provides a system where
the map data is manually inserted by their staffs and trajectory data are obtained from public
contributors. A trajectory is a time series of visited location point that shows a user movement
in a specific of time window. A trajectory may contain numerous of trajectory points, however
in some rare cases, a trajectory may consist of no trajectory points at all.
For the map data, the entry is manually inserted or updated by the administrator. A spatial
object can be modified several times by different administrators. For historical purposes
reason, the updated date and reason must be recorded for any objects added/modified by the
administrators. There are three types of objects in map data, which are Point Data, Road Data
and Region Data. Each object will have a unique object identifier called “objectID”. A Point
data shows a location for an object such as Restaurant, Shop, Education or Public Service.
Any other type of objects will be classified as Others. A Point may have multiple
classifications. For example, a shop may have a restaurant in it. Each Point object will have a
specific object name and the Geolocation coordinate that contains a pair of Latitude and
Longitude values.
A Road object is the road in the local area that might be classified as Highway, Primary,
Residential or Footpath. Highway is a road normally with 2 or more running lanes plus
emergency hard shoulder. This type of road is usually used to connect metropolitan area with
regional area. Primary road is the main road in an area. The Residential road is the road that
located in residential area which serves as an access to housing, without function of connecting
settlements. The Footpath is a road restricted to pedestrian and bicycle access. Each Road
entry must have road name and road length in Km. A road data is represented as a specific
sequence of coordinate list. The Region data is used to represent Region in the local area. The
Region data has region name, area size in SqKm and a specific sequence of coordinate list as
a closed loop.
A member must be registered in the system by providing preferred memberID, email and
name. The date and time when a member joins as user are obtained automatically during
registration. The Administrators are staffs in this company that have modification right to
insert, update or delete the spatial objects. The administrators are identified by their adminID,
email and name.
To submit their own trajectory data, a user or an administrator must be recognized as
Contributor. Only contributors can submit trajectories. Not all administrators or users are
considered as contributors. Contributors will gain points for trajectories submitted to the
system.
When submitting the trajectory data, an automatic TrajID will be assigned to the trajectory.
The member must provide the date when the trip trajectory was done. The time when a member
submits the trajectory will be obtained automatically. The trip duration and trip distance will
be calculated automatically based on the trajectory points provided by the member.
CSE2/4DBF – Assignment 1, Part 1 Page 3

TASK:
You are required to develop an EER model for the above problem description. The EER should
contain all necessary information such as entities, attributes, primary keys, relationships (including
specialization/generalization if any), cardinalities, and participation (including (min, max)). All
specialization/generalization and union type must be represented accordingly, instead being treated
as simple association relationships. Any assumptions should also be stated clearly. If assumptions
are made, it is important to make sure that the assumptions reflect possible real practice for a
particular industry and do not contradict with the problem description above