What is raster data good for?
- continuous data (as each cell is independent) elevation vs. soil types
- overlays (rasters have same dimensions/resolutions)
- satellite images
What does GIS stand for?
Geographic Information System
What is Raster Data?
- grid of squares
- similar to an excel spreadsheet
- each box = a picel = cell
- each cell independent and holds a number
- each cell has a fixed size
- x,y coords applied to each axis
Give an example of continuos data.
Elevation
Give an example of discrete data.
Soils (hard boundaries)
What are the 5 components of GIS?
Hardware Software Data People Methods
What are the 2 components of GIS table
Spatial: captured on map
Attribute: captured on table
What are some examples of typical queries done in the analysis phase?
- buffers
- overlays
- 911 routing
- watershed sub basins
- viewshed
What is GIS?
A system that uses spatial data to generate clear, understandable geographic images that can be used to aid in decision making.
Explain the difference between continuous and discrete data?
Continuous data is map data that has a gradual change and infinite possibilities. i.e. Elevation
Discrete data is map data that has distinct changes. i.e. Soil Type
What are the 3 main components of GIS?
Arc map - view and make maps
Arc catalog - manage data
Arc toolbox - analysis/data conversion
What are the 3 levels of ArcGis
Arc view - beginner
Arc editor - intermediate
Arc info - full load
