Extra slides for the geospatial slideset.

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# Geographic Dataset Formats

Formats for vector and/or raster datasets include:

- ESRI Shapefile
- GeoJSON
- KML

Shapefile types include:

- Required
  - `.shp`
  - `.shx`
  - `.dbf`
- Optional
  - `.shw`
  - `.prj`
  - `.sbn` &amp; `.sbx`

There are multiple shape files for different *layers*.

???
- References:
  - https://chiajung-yeh.github.io/Spatial-Analysis/basic-knowledge-on-gis.html#shapefile
  - https://en.wikipedia.org/wiki/Shapefile

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# Geospatial Datasets

Commonly-used geospatial datasets include:

- `mdsr::CholeraDeaths` &amp; `mdsr::CholeraDeaths`
- `fec12`
- `osmdata`
- `rnaturalearth`
- `spData` &amp; `spDataLarge`

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- Explain, in the terms specified in these slides, the datasets they saw in the text and will see in the labs and homework.
  - `mdsr::CholeraDeaths` &amp; `mdsr::CholeraDeaths`: J. Snow&rsquo;s cholera data 
  - `fec12`: US elections data
  - `osmdata`: Open Street Maps
  - `rnaturalearth`: R interaction with `naturalearth` world vector data
  - `spData` &amp; `spDataLarge`: Additional geospatial data examples
