Remote Sensing Image

This is the view of the base camp I was stationed at in Bosnia-Herzegovina from 2001-02, Camp McGovern. It lies on the outskirts of the town of Brcko, the district seat. The reason the details have been distorted is to maintain operational security; the bad guys can utilize this tool just as easily as the good guys. The remote sensing data displayed here is aerial photography. I believe that it is an infrared emulsion, the same type that the USGS uses to produce DOQQ's. I say this because with a DOQQ, true distance can be measured due to corrections in camera angle & relief; true distance can be measured in this image, as well.

Star Plot

A star plot is a graphical method of describing multi-variate observations which include an arbitrary number of variables. These observations are then represented as a star shaped figure; a single ray of proportional length describes the value of each variable. In this plot, the center point is the desired result of a phenomenon with the outlying colored lines representing observations; the results of these are plain to see in relation to the intended target.

Correlation Matrix

A correlation matrix is a graphical representation of the correlation between two numeric variables. The variables are labeled downward in a column and across the bottom in a row; the diagonal of the matrix consists of a value of one. This matrix displays the correlation by use of color; red indicates a positive correlation, green a negative, etc.

Similarity Matrix

A similarity matrix displays value scores that represent similar data between two given points. The data is mapped across the X and Y axes, presenting the user a row/column with which to compare values. The higher the score, the more similarities. This matrix measured the similarities between a group of photos; the peaks of similar values can be obtained from the accompanying scale.

Stem and Leaf Plot

A stem and leaf plot is used to display quantitative data graphically. It is useful in visualizing the 'shape' of a distribution of a phenomenon. This stem and leaf shows the cost of a variable on the left and the frequency of that variable occurring on the right; the distribution is easy to determine.

Box Plot

A box plot is a graphic that displays the center portion of a group of data and information about the data's range. The spacing between each of the points describes the size of the dispersion between observations. This box plot easily describes the numeric value for five separate observations as well as the range they contained.

Histogram

A histogram graphically displays frequencies that have been tabulated, the results being displayed as bars. These bars describe what proportion of cases fall into each of several categories. A histogram differs from a bar graph in that the area of the bar denotes the value, not the height. This histogram describes test results for a group of students; the proportion of students scoring different grades is readily apparent.

Parallel Coordinate Graph

A parallel coordinate graph plots an entire set of data observations. It does this by displaying all of them on one graph, making it easy to see deviations and/or trends from the average data path. On this graph, it is simple to see the data set that deviates from the others 'flow'; they are the dark green lines that peak at 4.0.

Triangle Plot

A triangle plot is a graphical representation of three variable ratios. Each vertex represents 100% proportion of the variable to its left and 0% proportion of the one to its right. This plot describes the composition of a soil sample and what constitutes its makeup. It is apparent that sand is the majority element in this sample.

Windrose

A windrose is a graphic used to display how wind speed and direction are distributed at a particular location. It is a tool often used by meteorologists. This windrose displays the wind direction (North, West, East, South) and the speed at which it occurred, in meters per second.

Climograph

A climograph graphically displays the monthly temperature and precipitation rates for a given location. Precipitation is depicted by use of a bar graph and temperature with a line graph. This is a climograph for a town in Brazil; the correlation between rain and temp. is easy to see with them being displayed together.

Population Profile

A population profile is a graphic representation of demographic data. This graph describes all of the ages of a US county and how many individuals it constituted. This data was continued over a three decade period and is clearly evident.

Scatterplot

A scatterplot reveals a correlation between two separate variables; the data is displayed as a collection of points. The data values determine the points placement on the horizontal and vertical axes. This plot is neat as the user has used it to predict a future action, and has incorporated that prediction into the plot.

Index Value Plot

An index value plot measures data in terms of percentages rather than as absolute numbers. It is useful in displaying discrepancies between data. This plot describes the flow of a stream over a certain time frame; the highs and lows are easy to determine for a given period.

Lorenz Curve

A Lorenz curve graph shows a cumulative frequency curve displaying a distribution of a variable against an independent variable. The curve in the line is due to inequalities between the different data sets; an equal distribution will yield a straight line. In this graph, it is easy to see the inequalities as they curve away from the equal distribution line.

Bilateral Graph

A bilateral graph represents both negative and positive data values in relation to a zero (mid) point. This graph is cool as it describes the accuracy of a mechanical arm in relation to the master control/template; the arm is 'slaved' to this control and receives directions from it. You can see from the graph how accurate the coordinated action is.

Nominal Area Choropleth Map

A nominal area choropleth displays data groups that lack any implicit order. Instead, it relies on a qualitative classification of these groupings. This is a map of the southern portion of the Balkans; it is a nominal representation because there is no prescribed order to the nations displayed.

Unstandardized Choropleth Map

An unstandardized choropleth portrays areal data but, unlike a standardized choropleth, it is not areally averaged. Again, the boundaries for this type of map are often census tracts.

Standardized Choropleth Map

A standardized choropleth portrays areal data and is areally averaged (i.e. density-persons per square mile). This aids in comparing data across geographic boundaries. Often, areal divisions are census tracts (counties, states). This map describes the percentage of Canadians under the age of 14, and their location.

Univariate Choropleth Map

A univariate choropleth map displays the spatial distribution of an attribute as it relates to a single topic, or theme (univariate). In this map, the single topic is hay production for a given year; the distribution is portrayed by use of a colored scale and counties relating to this technique.

Bivariate Choropleth Map

A bivariate choropleth map is a thematic map displaying the relationship between two or more variables. It does this by use of a graded color scale, giving it the ability to convey both spatial and statistical information. This map of African countries displays three separate but related data sets: land use, life expectancy and GNP per capita.

Unclassed Choropleth Map

An unclassed choropleth maps' numeric attribute values are converted directly into proportional degrees of shading; the higher the attribute value, the darker the shade. It is considered 'unclassed' because it uses a continuous scale, not interval breaks. This map displays the fertility rates of European women; the countries with the highest/lowest levels are immediately evident.

Classed Choropleth Map

A classed choropleth map utilizes classification techniques to 'break up' intervals, which consist of: equal steps, quantiles, natural breaks and minimum variance. This maps legend uses the equal interval technique with six separate classes.

Range Graded Proportional Circle Map

Range grading details statistical information in proportional circles. This is designed to represent discrete ranges of data values rather than exact numbers. This technique allows for easy identification of values, as this map of populations exemplifies.

Continuously Variable Proportional Circle Map

A continuously variable proportional circle map is a proportional circle map, whereas the point data is mapped with a circle instead of with a dot. The number of circle sizes is not set; the size is representative of the distribution of the variable. This is a map of the Czech Republic utilizing this technique; I do not read Czech so I am not sure what variable is represented here.

DOQQ

A DOQQ (Digital Orthophoto Quarter Quad) is a computer image generated from an aerial photo. Unlike an aerial, planimetric features are in their true geographic positions as camera angle & relief have been corrected. This is essentially a photo-map, where distance can be measured.

DEM

A Digital Elevation Model (DEM) map is a dataset of digital cartographic/ geographic elevations.The data is typically obtained through remote sensing, such as satellites. This is a DEM of the island of Oahu; clearly seen are the differences in terrain elevation.

DLG

A DLG (Digital Line Graph) is a digital representation of features displayed on a US Geologic Survey map. It utilizes vectors rather than raster. This is a map of a geologic survey; the benefits of using digital are obvious, as the details are readily apparent.

DRG

A DRG (digital raster image) is a scanned image of a US geological survey topographic map. It is geo-referenced to the surface of the Earth and is fit to the Universal Transverse Mercator projection.

Isopleth Map

An isopleth map is used to describe information that shares a common value of a measurable quantity; it does this by use of a joining line. This is an isopleth of the total precipitation levels in the U.S. for a given year. You can quickly determine the areas that realize increased levels of rainfall in relation to others.

Isopach Map

An isopach map measures the thickness of stratified layers in the Earth's surface and sub-surface. Geologists frequently use these types of maps. This is an isopach of the moon, showing various thicknesses of its surface.

Isohyet Map

Isohyetal maps show precipitation. They do this by using a solid line that joins points of equal precipitation. This map is easy to read as the varying amounts of rainfall are color-coded and there is a legend to reference.

Isotach Map

Isotachs are maps showing wind speeds. They do this with lines; speeds of equal measurement being enclosed. This is an isotach map showing the associated weather front causing the winds that are displayed.

Isobar Map

An isobar is a line of constant or equal barometric pressure, displayed on a map. These can be useful to meteorologists as they help to determine weather patterns. This is a map of isobars and the various weather fronts associated with them over west Europe.

LIDAR

LIDAR uses laser pulses to detect objects; the data captured is then used to create a map. This process is effective in modeling vertical structure and is very accurate. This is an image of a terrain feature, showing elevation and depression, plus the grids that were used to map the returns.

Doppler Radar

For civilian purposes, a Doppler radar map typically displays precipitation by use of the Pulse-Doppler radar technique. Doppler can also determine the directional motion of the phenomenon, object, etc. This is a Doppler view of Hurricane Ivan as it came ashore along the Gulf Coast. The image shows the severity of the rainfall and the relative areas affected.

Black & White Aerial Photo

Aerial photos can be used to describe a wide selection of subjects, including: structures, changes over time, vegetation, etc. The aircraft follows a determined flight line which translates into a number, corresponding with surrounding map sheets. I chose this photo mainly because of the level of detail at a scale of 1:40,000 but don't particularly care for the subject as it is that other school located in Gainesville.

Infrared Aerial Photograph

Infrared sensors detect a certain portion of the light spectrum, from which photographs can be produced with the resulting image. This technology is useful in detecting and documenting changes to the environment. This is an infrared of an archipelago; clearly seen are the different types of natural habitat and their relation to one another.

Cartographic Animation

A cartographic animations' goal is to depict change, usually over a period of time. It does so by displaying the variable graphically. This is a great example of an urban area being flooded, and just as importantly, where the water level is predicted to be at certain levels.

Statistical Map

Statistical maps display the distribution of a variable over a geographic area. The variable is presented as a statistic. This map shows the percentage of unmarried men to unmarried women in the US, by county. The counties with the largest disparities are clearly shown. I like this map because it is misleading; what you don't know is that the population of incarcerated men is included in the ratio, thereby giving the indication that certain areas have more of an imbalance than others.

Cartogram Map

Cartogram maps substitute land area accuracy for a variable. The result is a distorted view of actual land area but the data can be read effectively. This cartogram is of the United States with each counties population size determining the shape. It shows the 2004 presidential election, red being Republican and blue being Democrat, and how they voted.

Flow Map

The flow map is used to display movement from one location to another. This can be either literal movement (immigration) or a process (installing a ceiling fan). This is a simple example of the process to make a sandwich. It is effective because it tells you what steps to take and, just as importantly, what order to take them in.

Isoline Map

An isoline map utilizes continuous lines to describe a data set. The map depicted here is simple but effectively explains the definition given. This map shows the temperature variations over North Carolina on a given day. One can easily determine which areas of the state are affected by different temp's, and what those temperatures are per the legend.

Proportional Circle Map

A proportional circle map uses circle size and placement to display frequency or the number of a variable. Circle size increases as the variable increases. This is a map of the Mediterranean Sea and the tsunamigenic events over the last 500 years. The size of the circle is directly proportional to the events magnitude.

Choropleth Map

The choropleth map displays data across an area by use of colors or shading, this being in proportion to the measurement of the variable. This makes the information easy to visualize because you can see how it changes across a region. This map of Australia is a good example as it is very easy to determine the different climates of this continent, and how they change from one to the next.

Dot Distribution Map

A dot distribution map shows a density or occurrence of certain phenomenon or data, as well as the location they occur. This map is interesting because it shows the population distribution of China, the most populous country on earth. Each red dot represents 50,000 people; the areas where people reside is readily apparent.

Propaganda Map

The propaganda map is used to convey a political message through the use of symbols, images and geography. This map is from WWI and shows the opposing countries at war. It is effective because it not only shows who is fighting proximity wise, but also instills preconceived notions by the use of negative imaging.

Hypsometric Map

Hypsometric maps display relief with a sequence of colors, each one representing a different elevation. This portion of a map shows mountainous terrain with color tints expressing the extremes of elevation very effectively.

PLSS Map

PLSS Maps (Public Land Survey System) are used to divide and organize lands owned by the the Federal Govt. for the benefit of the public domain. They are basically the opposite of cadastral maps, which deal with private ownership. This map is not the most exciting but I chose it because it clearly displays the division and classification of land parcels within this county by their numeric label.

Cadastral Map

A cadastral map displays private property ownership as it relates to properties around it. One function is to serve as a basis of taxation. This is a map of a European village dating from 1852. This is interesting because it tells us that property ownership (and the resulting taxation) was important as long ago as that, and possibly even longer.