This is a nominal area choropleth because there are no classifications or numerical data being presented, it is simply a map displaying places and oceans, it is choropleth because of the different colors used for different countries.
Univariate choropleth maps are choropleth maps displaying only one type of data. This map focuses only on water withdrawals in the United States.
A Bivariate Choropleth map is one that shows multiple pieces of data on one choropleth map. This map of Africa shows its land use, life expectancy, and GNP per Capita, all together with only one map.
Range graded circle maps have only a particular range of circles used, the are not infinite. In this map it shows the exact size of the circles being used and what they represent, and these are the only circle sizes used.
In a continuously graded circle map like this one there are infinite circle sizes used to represent approximate numbers. In this map there are 5 circles shown in the key to give a visual aid to what each size represents, however on the map there are many in between sizes to closer represent their number. This cartographer also conveniently wrote the actual amount by the circle.
Multivariate maps display 2 or more types of data in one map. This map is also a proportional circle map, however it is multivariate because it shows proportional population of each region with the circles, but also uses a pie chart method to separate each minority and show how many of each are in particular regions.
This parallel coordinate plot compares the makeup of different fruits and vegetables, each fruit is represented by a different color and % levels of glucose, fructose, maltose, and saccharose are examined. This graph shows that the only vegetable with maltose is corn, all others drop to 0%.
This lorenz curve show % of households versus % income, the blue line shows how the graph would look if there was 100% equality in income, the red line shows how things actually are with some people making more than others.
This is an interesting triangular plot it shows the separation of opium samples found in different places around the world. The three variable are % of narcotine, codeine, and morphine. Shapes inside the triangle represent the different locations.
A wind rose is a circular graph showing the direction and frequency of wind, this particular one also shows the wind speeds. Each circle represents a percentage which is the percent of time that wind travels from that direction, the colors show the speeds of the wind.
This stem and leaf plot shows the ages of people at a family reunion, stem and leaf plots make it possible for a lot of information to be shown more easily and with little confusion. The way this plot works is, the stem is the tens place and the leaf is the ones place, for example if your stem is 5 and your leaf is 1 the age of that person is 51.
A scatter plot compares two pieces of information, this scatter plot compares the wife's age versus the husband's age. If a trend line was placed on this graph it would be relatively straight and show a positive relationship, with a few outliers.
A bilateral graph shows related information, for example this graph shows how unemployment decreases and number of jobs increases after Bush's Jobs and Growth Act. The area to the left shows a natural decrease because unemployment is high and jobs are low, to the right you see a natural increase because unemployment is low and jobs increase.
Line graphs show data over time, they can either show raw data, an average trend line, or both. This graph shows raw data for the Dow Jones from 1985 to 2005.
This unclassed choropleth map displays statistical data through the different shades on the map. This map show the fertility rates in countries in Europe, with the smaller numbers being lighter and the larger being darker.
This is a classed choropleth map of the percent of hispanic and latinos by county in Florida. Each data class has a range of percent that matches with a color, the map shown uses natural breaks. For this map the greater the percentage the darker the shade.
DRG's are scanned images of the U.S. geological survey topographic maps. DRG's are often used as a map layer and when combined with other digital products the resultimg map shows much more cartographic information.
Isobars are lines showing areas of constant pressure, areas of the same pressure are connected by continuous lines. This map shows pressures over Europe and the Atlantic ocean.
Infrared aerial photos can be used to show changes in the environment, such as the health of forests and oceans. It is also used on farms to detect changes in land and possible diseases or infestations. This map shows land in Sonoma County, Ca.
Statistical maps show variation in quantity of a certain factor. This map shows the changes in residential population for the United States. There are different types of statistical maps this map is also a chloropleth map since it uses different shades of green to represent the different percent changes.
Hypsometric maps are a type of topographic map that uses lines and colors to show the difference in levels of terrain. In this map the darker colors represent areas of lower elevation and the light beige represents the areas of highest elevation.
PLSS stands for Public Land Survey System, these maps are used to survey and identify land parcels. They are most commonly used for rural or undeveloped land. This map shows the principal meridians and baselines for the states that are a part of the PLSS.
Propaganda maps are used by the government to persuade people of certain plans or educate the public, they can also be used as method of intimidation against other countries. This map is of Europe during World War 1, it uses people as well as animals to show the different sizes of countries and their power.
This is a proportional circle map of internet users in Europe in 2004, the map uses circles of different diameters to represent different amounts of people. In this particular map the smallest circle represents under 200,000 people, and the largest circle represents over 8,500,000. Each circle is placed over a country and represents that countries data.
Choropleth maps use different colors and shading to depict statistical values if particular areas. This map shows the percentage of the population that is 50 years or older. In 1990 only 0-10% was over 50, it is predicted that by 2030 10-30% of people will be over 50 years old. The scale in the middle shows the percentage range and the correlating colors that will be be seen on the map. 
A Cadastral map is used to show legal property boundaries, it represents relative positions and dimensions of land and can also show streets and other features in the area. This map is of the Olmstead Park in 1909, the area is now a neighborhood in the Alameda District in Northeast Portland. The map shows sizes and shapes of each individual lot as well the streets, their names, and sizes.
A Flow map can be used to display any type of movement, for example people in migration, goods through trade, and the spread of disease. This particular Flow map displays the traffic of telecommunications in certain countries of Europe. The scale in this type of map is very interesting, the thickness of the line from country to country is relative to the millions of minutes used during telecommunication between those places. The white circles represent the total annual outgoing traffic to other countries. 
This topographic map of India displays the many regions as well as their altitudes. In addition to just showing land masses it also shows the surrounding bodies of water and their depths as well. The graph uses a colored key system to describe the different ares altitudes, each color is paired with a specific number of meters and anywhere that color exists so does the corresponding altitude. The map seems to focus mainly on general regions, it is not to scale therefore it does follow the correct latitude and longitude system.
