 |
 |
 |
|
 |
|
 |
|
|
 |
 |
 |
Introduction to spatial queries
The database structure, which is included in a GIS, enables the logical,
consistent and ordered
storage and management of data. Both thematic and geometric information are stored
in the form of tables. In the discipline of geoinformation, the term data analysis includes all those
investigations, queries, evaluations, etc., which are carried out on structured and stored spatial data.
When a query is performed to obtain and answer to a spatial question, the data
are accessed through the basic elements of this structure which is made up of tables, fields,
data sets, values and connections.
Citation:
The deduction of new information from existing spatial data is one of the main tasks of a
geoinformation system.
(Bill 1999)
Spatial analysis comprises analysis and synthesis of spatial data to a unity [...]
Every spatial analysis implies the professional interpretation of the resuslts.
Example of a query:
"Which proportion of the inhabitants of Zürich lives more than 200m away from a public transport stop?"
 |
|
|
|
|
|
|
|
