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What Is GIS?
Transcript of What Is GIS?
Spatial queries are unique to GIS. They are queries based on the spatial characteristics of a feature- for example: show all stores in state of Utah.
Displaying geographic data is often the first step in any GIS project. Display is a simple way to understand and explore your data. Carefully studying maps, charts, and graphs can often become the starting point for more complex analysis.
What is a Geographic Information System (GIS)?
spatial information permits organization by location (geography)... and this is handy because it allows us to place data in context, and naturally allows us to question relationships.
Final products from a GIS:
-Electronic map (interactive or flat)
-Data set for further analysis
The output of a GIS can take many forms.
The output that you choose will depend on the intended audience, the overall message you are trying to communicate, and the needs of the project.
Proximity analysis used to measure distances between objects.
Overlay analysis answers the question: “what is on top of what?”
Network analysis uses network data, such as roads, transit and walking/bike paths to provide trip directions, times and distances
GIS links locational (spatial data) and database information (tabular data) creating opportunities for visualizing patterns, relationships, and trends.
components of geographic data:
attribute- what is it?
spatial- where is it?
store, manipulate, analyze, manage, and display spatial or geographical data
geographic information system
remember Jon Snow?
this John Snow...
provides descriptive (both qualitative and quantitative) attribute information
this tool handily combines 3 common analyses:
proximity, overlay and network