# Maps & Cartography

## Equal Area Projection Maps in Cartography

The equal area projection retains the relative size of area throughout a map. So that means at any given region, it keeps the true size and area of features.

## How Universal Transverse Mercator (UTM) Works

Universal Transverse Mercator (UTM) segments the Earth into 60 zones (each UTM zone is 6‎°) and projects each zone with an upright cylinder of its own.

## What Is a Map Legend?

A map legend is used to define features in a map. Point, line and polygon symbols in a legend key is the driving-force to understand what is found in a map.

## 10 Climate Change Maps – The Climate Explained

From crop production to melting glaciers, these climate change maps help your grasp a clear understanding of our transforming climate.

## Cylindrical Projections in Cartography & Maps

When you place a cylinder around a globe and unravel it, you get the cylindrical projection like the Mercator, Transverse Mercator and Miller projections.

## The Geoid – Hypothetical Mean Sea Level

The geoid measures mean sea level and gravity. The GRACE and GOCE satellites are providing the most accurate measurements of the geoid to this date.

## Vertical Datum – Earth’s Elevation Reference Frame

A vertical datum is a reference surface of zero elevation to which heights are referred to. Datums are used to measure height and depth from mean sea level.

## Geodetic Datums: NAD 27, NAD 83 and WGS84

Ellipsoids, survey benchmarks and triangulation – these are the ingredients for geodetic datums. NAD27, NAD83 and WGS84 are common datums in North America.

## Degrees/Minutes/Seconds (DMS) vs Decimal Degrees (DD)

We can find any location on Earth using latitude and longitude coordinates. And we measure those coordinates with decimal degrees or degrees/minutes/seconds

## Greenwich Meridian (Prime Meridian)

The Greenwich Meridian (or Prime Meridian) is a zero degrees longitudinal It is the start-point which we measure 180 degrees east and west.