Wednesday, October 26, 2011

Isopleths


Isopleths maps is continuous distribution that show third dimensions on a map helping to simplify and generalize specific data. The third dimension is shown by a series of lines called isopleths that connect points of an equal value. The difference between the two adjacent isopleths is called the isopleth interval. These maps are common when mapping surface elevations, atmospheric pressure, amounts of perception, and other statistical elements that can be viewed as a third dimension on a map. The map above is the mean annual snow fall which helps to show the impact of the winter.

http://www.weathernotebook.org/features/winters.html

Isopach


Isopach images use contour lines in order to connect points of equal density or thickness. These images are typically used for geologically imaging, stratigraphing in sediment layers.

http://www.glossary.oilfield.slb.com/Display.cfm?Term=isopach

DRG


A DRG (digital raster graphic) is a scanned image of a U.S. geological survey topographic map. Typically USGS 7.5-minute quadrangle are the images that are scanned for DRG, but can include any raster graphic as long as it is georeferenced so the images could interlay with one another. The picture above is a DRG showing the western section of Washigton, D.C.


http://egsc.usgs.gov/isb/pubs/factsheets/fs08801.html

Wednesday, October 19, 2011

Histogram

A histogram is a bar chart that displays a variation of frequencey by being grouped together in ranges. A histogram will show us the most frequently occuring value, overall range, and the shape of the distribution.

Population Profile

A population profile displays the perecentage of people from a particular age group within that society. The younger the population the wider the population profile is on the bottom. Above is a population profile of the Philippines showing that it has large younger population. Japan for example would look almost opposite to this graph because they have a larger older population than younger.

Climograph


A climograph is graph of climatic conditions such as precipitation and temperature of a given place during a specific range of time. This specific graph above show the precipitation in inches and temperature in Fahrenheit throughout the course of a year broken up by months.


Stem and Leaf Plot

Stem and leaf plots allow you to display the statistical information by revealing its distribution, central tendency and dispersion, without losing any of the outliers. This graph above is a stem and leaf plot representing the different heights for adults.