# Spatial - Projection

## About

Projections: summarizing mutli-dimensional data in two or three dimensions.

## Example

Data Projections
Scale projection function
Data domain Pixel Range
DateTime (Years, Month, Date, Time) Pixel (x,y)
Attendance (Float) Pixel (x,y)
Mercator projection function
Geographic Coordinates Pixel Range
Latitude, Longitude Pixel (x,y)

## Coordinates

Projected coordinates are planar Cartesian coordinates that result from performing a mathematical mapping from a point on the Earth's surface to a plane. There are many such mathematical mappings, each used for a particular purpose.

## Distortion

Projection distortion: Each circle represent the same area on the earth

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