As exercise consider the following two applications and create a conceptual model using OMT-G for each of them.
1. Cadastral Application:
- A
cadastre is a type of land information system that gives support to the
management of land. Basic spatial object is a parcel upon which land
tenure and use tenure are recorded.
- Thus,
a cadastre is an IS composed of two parts: (1) series of maps
describing the location, shape and size of land parcels (2) text
records describing the attributes of the land.
Typical queries are: - Which parcels have the land use type of “x” with a minimum area of “y” and are located in a specific spatial window “z”?
- Who were the owners of parcel “x” in block “y” in the last “z” years?
- Which parcels were owned by “x” in the last “y” years?
- What are the changes that occurred on parcel “x” in the last “y” years?
- What were the parcels in block “x” in year “y”?
- What was the last new parcel created in block “x”?
2. Transportation system application:
- Highway network system supports the control and management of a transportation system.
- It
is essentially composed of a network describing the transportation
systems and attributes that describes static and dynamic conditions of
the network.
Queries to be supported: - Find the number of cities along the highway “x”.
- Find the number of highway intersections of highway “x”.
- List the highways that connect “x” and “y”.
- Find the last intersection on the highway “x”.
- How long does it take from “x” and “y”?
- What are characteristics of highway “x” between “y” and “z”?
- What is the current traffic condition of the route between “x” and “y”?
- What is the direction of traffic between “x” and “y”?
- Find highways that cross county “x”?
- What is the shortest path between “x” and “y”?
|