# Section Nine - Just a Few Extras

This page contains just a few extras to help you better understand ideas about
projection
**technically**: the result of using one of variety of methods to transfer the geographic locations of features from a geographic coordinate system to a developable surface
**everyday use**: any coordinate system, geographic or projected
methods and projected coordinate systems. Lots of times, when we read thing written by different authors, the concepts are really clarified.

### An Article About Various Projection Methods - USGS

This article does a great job of explaining the uses of several common
projection
**technically**: the result of using one of variety of methods to transfer the geographic locations of features from a geographic coordinate system to a developable surface
**everyday use**: any coordinate system, geographic or projected
methods, which will later become projected coordinate systems. Like we learned earlier, the
projection
**technically**: the result of using one of variety of methods to transfer the geographic locations of features from a geographic coordinate system to a developable surface
**everyday use**: any coordinate system, geographic or projected
method is the means by which we transform the round Earth into a flat map after selecting a
developable surface
a geometric shape which will not be distorted when flattened. Used as the base shape to transfer features during projections. Most often a cone, cylinder, or plane (azimuthal)
and an
aspect
The direction the
developable surface
a geometric shape which will not be distorted when flattened. Used as the base shape to transfer features during projections. Most often a cone, cylinder, or plane (azimuthal)
faces in relation to the geographic coordinate system. Normal; transverse, oblique
. To get from a
projection
**technically**: the result of using one of variety of methods to transfer the geographic locations of features from a geographic coordinate system to a developable surface
**everyday use**: any coordinate system, geographic or projected
method to a projected coordinate system, one must first select either a single tangential line or two tangential lines and a linear unit of measure (metric, imperial, or international imperial) for that specific projected coordinate system. We learned that
projection
**technically**: the result of using one of variety of methods to transfer the geographic locations of features from a geographic coordinate system to a developable surface
**everyday use**: any coordinate system, geographic or projected
methods can be either secant either one parallel or Meridian (or tangent at two), and while that is indeed true, it's important to note that just because that is *how* we get a
projection
**technically**: the result of using one of variety of methods to transfer the geographic locations of features from a geographic coordinate system to a developable surface
**everyday use**: any coordinate system, geographic or projected
method, it's not creating a projected coordinate system until the line(s) - or single point, in the case of azimuthal
projection
**technically**: the result of using one of variety of methods to transfer the geographic locations of features from a geographic coordinate system to a developable surface
**everyday use**: any coordinate system, geographic or projected
method - of intersection AND pick a linear unit.

### Projections Wizard - A Projection Selection Tool

Projection Wizard is a web application that helps cartographers select an appropriate
projection
**technically**: the result of using one of variety of methods to transfer the geographic locations of features from a geographic coordinate system to a developable surface
**everyday use**: any coordinate system, geographic or projected
for their map. Depending on the extent and the distortion property of the map, the application returns a list of appropriate map projections with additional
projection
**technically**: the result of using one of variety of methods to transfer the geographic locations of features from a geographic coordinate system to a developable surface
**everyday use**: any coordinate system, geographic or projected
parameters if necessary. The Projection Wizard is based on John P. Snyder’s selection guideline and on the extension to this guideline for world and hemisphere maps written by the Cartography and Geovisualization Group at Oregon State University.

The Projection Wizard displays a map preview on the right side of the list with appropriate projections. The preview shows how the projected data will look and in most cases does not show the correct geographic extent. The map preview is created using D3.

### XKCD Web Comic - What your Favorite Map Projection Says About You

Just a few examples of visualizing
projection
**technically**: the result of using one of variety of methods to transfer the geographic locations of features from a geographic coordinate system to a developable surface
**everyday use**: any coordinate system, geographic or projected
from around the web.

XKCD A webcomic of romance, sarcasm, math, and language. http://xkcd.com/977/

XKCD A webcomic of romance, sarcasm, math, and language. http://xkcd.com/977/

### V-Sauce: What Does Earth Look Like?

Another well done video by our friends over at V-Sauce