Friday, July 24, 2009

KML Remote Sensing



KML is a type of file format used to display geographic data. GoogleEarth uses this type of format when displaying their maps of the Earth. Remote sensing is used to produce these files. Remote sensing is a technique used to collect data about the Earth without taking a physical sample of the Earth's surface. This is done by placing a sensor to measure the energy from the sun reflected from the earth. This information obtained can be displayed as a digital image or as a photograph.

This example of a KML image was taken from a sunken French submarine off the coast of Europe. The image was credited to the US Navy and is taken from an Eye alt of 28 meters.


Monday, July 13, 2009

Star Plot



The star plot is a method of displaying multivariate data. Each star represents a single observation. Each observation is represented as a star-shaped figure with one ray for each variable. For a given observation, the length of each ray is made proportional to the size of that variable.
This example is showing information on automobile data-size, price, performance, etc.
http://www.math.yorku.ca/SCS/sugi/sugi16-paper.html

Correlation Matrix



A Correlation Matrix is a table that shows the degree of relationship between two variables.
This example shows the relationship of tissue samples in a genetics study. The red squares are most closely related.
http://www.livestockgenomics.csiro.au/Genome_to_Phenome/

Similarity Matrix



A Similarity Matrix shows how similar two variables are.
This example shows similarities in 10 different strands of bacteria found along the coast of Pakistan. This was used to catalog bacterial strains that are disappearing because of pollution.
http://www.jbaas.com/articles/vol_2_n2_c7.php

Stem and Leaf Plot


A Stem and leaf plot is a method for showing the frequency with which certain classes of values occur. Typically the "stem" is the left hand column containing the tens digits and the "leaf" is in the right column and contains the ones.
This example shows the heights of 200 adults. The left (tens column) contains the number of whole inches and the right column (ones) shows the decimal of that inch. When a number is repeated in the ones column, more than one person was that height.
http://nyjm.albany.edu:8000/~reinhold/m308/Assgnmt1_HowTo.htm

Box Plot


Box Plots are a great way to see the of variability in data. They show a measure of the median, average and dispersion. They are useful when comparing two or more sets of data.
This example compares the number of damaged packages in two shifts of a company. While the medians differ (as did the averages), the data have considerable overlap and the difference in shifts probably do not account for the damages. A person looking at this plot would know that defects are probably being caused by some reason that occurs on both shifts.
http://www.introtoie.com/C05-01.html

Histogram

Histograms are graphical representations of data sets. The bar's height represents the frequency and the bar's width is proportional to the classes in which the data has been divided.
This example shows the distribution of salaries of the Acme Corporation. By looking at the data in this form, we can see that the majority of employees make the middle-range salary ($44,000-$54,000).
http://www.statcan.gc.ca/edu/power-pouvoir/ch9/histo/5214822-eng.htm

Sunday, July 12, 2009

Parallel Coordinate Graph


Parallel Coordinate graphs places multiple sets of data on one chart. These are particularly good for seeing trends and outliers.
This example relates a car's price to other features important to a person purchasing a new car.
http://florence.acadiau.ca/collab/hugh_public/index.php?title=GGobi_Intro

Triangular Plot



A Triangular Plot is one that displays three sets of data or variables. The intersection of the three axis gives the class of the unknown.
This triangular plot shows carbonate rock composition from Tennessee, West Virginia and Pennsylvania in terms of the three components that represent carbonates, clays, and silica. The figures were calculated from published rock analyses.

Windrose



A Windrose is a tool used by meteorologists to represent which direction wind is blowing from (wind direction) and speed in a particular location.
This example of Yakima,Washington shows the wind's top speed was 17-22 knots at recording time.
http://www.climate.washington.edu/climate.html

Climograph

A Climograph shows a location's average temperature and precipitation. This is used to predict an area's climate.
This is an example of a climograph of Manaus, Brazil. From this information we see that the area has lower precipitation on the warm months and peaks in precipitation in October.
http://www2.volstate.edu/kbell/climographs.htm

Population Profile

A Population Profile is a chart that shows the number of people as a function of their ages.
It could inlude age/ sex distributions for a given region.
This profile is comparing Crookwell and Gunning Shires in Upper Lachlan. By looking at the data we see the population of 15-59 year olds is increasing in the Gunning shire while the Crookwell shire's population is increasing among the 60+ group.
http://www.envcomm.act.gov.au/soe/soe2004/UpperLachlan/population.htm

Saturday, July 11, 2009

Scatterplot


Scatter plots are similar to line graphs in that they use horizontal and vertical axes to plot data points. Scatter plots show how much one variable is affected by another. The relationship between two variables is called their correlation . Scatter plots usually consist of a large body of data. The closer the data points come when plotted to making a straight line, the higher the correlation between the two variables, or the stronger the relationship.
The above plot shows the relationship between ages of husbands and wives.
http://cnx.org/content/m10950/latest/

Index Value Plot

An Index Value Plot is a type of visualization map in which an index value is plotted on a line map. It uses index value instead of an absolute value.
This is an example of relative daily index closings among markets around the world.
http://www.mathworks.com/products/demos/shipping/garch/garchcopulaevtdemo.html?product=GA

Lorenz Curve

A Lorenz Curve shows an unequal distribution between two variables as a curve. The further away from a 45 degree angle, the greater the inequality.
In this example,the straight green line is the Lorenz curve of an idealized perfectly egalitarian society - where everybody has exactly the same income. The red Lorenz curve - horizontal and then vertical - is that for the extreme authoritarian or totalitarian society where one person has all the income. Curves for societies with intermediate income distributions are also shown.
http://chesters.org/marvin/GINI/index.html

Bilateral Graph

Bilateral Graphs are useful when data has both positive and negative values.
This graph represents the a lowering unemployment rate as presented by the US Treasury's press release. The line for this is not going straight down (all negative).
http://www.ustreas.gov/press/releases/

Standardized Choropleth Map

A Standardized Choropleth map is one that has been areally averaged.
This is an example showing the number of people per square kilometer in Astoria, Oregon.
http://pubs.usgs.gov/tm/tm11c2/

Thursday, July 9, 2009

Choropleth Map



A choropleth map is a type of thematic map in which areas are shaded in proportion to the measurement of the data being displayed in the map. Although they are based on statstical data, the data collected is shown over previously defined regions.
In this example, the variations are among the divorce rates between 1980 and 1990 at both the state and county level.


Wednesday, July 8, 2009

Univariate Choropleth Map

Univariate Choropleth maps show a single data set (variable).
This map shows the median income of the population of each state as provided by the United States Census Bureau.
http://mikesmaps.blogspot.com/

Bivariate Choropleth Map




Bivariate Choropleth maps show two types of data (variables) on a single map.
This bivariate map shows both the margin of victory for each presidential candidate and the voting age of those who voted.

Tuesday, July 7, 2009

Unclassed Choropleth Map




Unclassed Choropleth maps do not have defined intervals. The numeric values are converted into proportional degrees of darkness.
In this map, the darker the shading, the higher the fertility rate for countries in Europe. There is not an exact fertility rate range for each country.

Classed Choropleth Map

A Classed Choropleth map contains data that is color coded. The amount or color of shading corresponds to the key. The data is combined into smaller groups and is portrayed in intervals.
This map is classified into four groups based on the number of males per 100 females in each state.
http://my.ilstu.edu/~jrcarter/Geo204/Choro/

DOQQ



Digital Orthographic Quarter- Quads (DOQQs) are aerial photographs that have been corrected to remove any distortion. Doing this allows the photos to be used as flat maps with more accurate measurement.
This DOQQ example is of Sabine Pass, Texas. It contains enlargement to show one meter resolution.

DEM

Digital Elevation Maps (DEMs) show terrain topographyin Raster format.
This DEM example shows the elvations of areas within North America.

DLG





A DLG (Digital Line Graph) maps show boundaries, roads, and other various information found on topographical maps. DLGs are a form of graphic information system.
This is a DLG of Columbus, Georgia. It contains roads (red lines), trails (black lines) and olympic venues (green area).

Thursday, July 2, 2009

DRG




A digital raster graphic (DRG) is a type of U.S. Geological Survey. It is a form of digital map.
This one is of Evergreen Lake and Golf Course.
http://www.mapmart.com/Products/TopographicalMaps/SeamlessDRG.aspx



Isopleth



An Isopleth map shows a feature by connecting lines of equal value.
In this example, the area around three municipal waste incinerators in Jacksonville was examined. The extent of a toxic chemical average (100 micrograms per meter) was noted by the isopleth line.
http://www.stonelions.com/Jacksonville.htm

Isopach

An Isopach map consists of lines connecting places of equal value (thickness) for a given theme such as rainfall or temperature.
This map shows the thickness in feet of shale deposition along the Appalachian Basin. The purple area is a thinner area and the red is the thickest.
http://www.searchanddiscovery.net/documents/2007/07022lash/index.htm



Isohyets

Isohyet maps are used in recording amounts of precipitation during a specific period.
This isohyet map was used to show average rainfall in milimeters. The information provided will help farmers choose which clover to grow based on his/her location on the map.
http://www.dpi.nsw.gov.au/agriculture/field/pastures-_and_-rangelands/establishment/clover/part-f---choosing-the-right-sub-clover-v