Comparisons are fundamental to many GIS analyses and applications.
Enabling users to understand changes, trends, and patterns within geographical spaces.
You can compare data from 6 perspectives:
1. Temporal:
Analyzing changes in a particular area over time.
2. Spatial:
Comparing data from different locations to understand geographical variations.
3. Thematic:
Evaluating different thematic layers, such as land use, elevation, or precipitation data, to understand relationships or impacts.
4. Scale:
Analyzing data at different scales to observe patterns that emerge at local versus regional levels.
5. Data Source:
Comparing data collected from different sources or methods to validate accuracy or understand discrepancies.
6. Scenario:
Comparing projected or modeled outcomes under different scenarios to aid in decision-making.
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The analysis and evaluation of differences, similarities, or relationships between various spatial datasets have been conducted for many years before GIS.
The Comparative Heights, of the Principal Mountains and Lengths of the Principal Rivers in the World by William Darton and W. R. Gardner, 1823 serves as an example.
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