Week 8: Census 2k ArcGIS

   The Population Density, 2000 Map shows the population density in units of people per square mile of each county in the U.S. The calculations were made by taking the units of people in the Tab01.APR01_2000 table and dividing it by the the area in the Counties.AREA table given in square miles. The color ramp chosen for this map makes it easier for those reading the map to see which county is more densely packed, moderately densely packed, and not densely packed with people. Among the various greens, the Dark Navy Blue counties indicate which counties are dense easily. The very light shades of green tell the map user that it is not dense in that county.
    The Percent Change, 1990 to 2000 Total Population Map shows the change in percentage of total population in the counties from year 1990 to 2000. The values were taken from the table provided to us in class. The dark purple counties, that depict the highest percentage in change in population from 1990 to 2000 and that total population in those counties increased greatly, are easy to distinguish from the counties that had negative population change, in that total population for that county decreased from 1990 to 2000. The counties in purple tell us that those counties had increase in population form 1990 to 2000, and the tan, yellow counties tell us that those counties had a decrease in population from 1990 to 2000.
    The Number of People, 2000 Map shows the number of people per county in the US. in 2000. The values were taken from the table provided to me from class. The color ramp of light purple to dark purple is appropriate because we are only looking at the number of people. The light purple tells the map user that those counties have less people than the dark purple counties which have more people.
    The Difference, 1990 to 2000 Number of People Map shows the difference in the number of people in each county from 1990 to 2000. The values were taken from the table provided to me from class. There are two different colors. The pink colors represents a decrease in the number of people in a county from 1990 to 2000 and the green colors represents a increase in the number of people in a county from 1990 to 2000. The two colors are different enough that it is easy to distinguish which counties overall had an increase or a decrease in number of people in a county.