Monday, November 14, 2011

Lab#7: U.S. Census




Every 10 years, the U.S. Census Bureau collects population data in order to accommodate changing populations in distribution of electoral votes, Congressional seats, and program funding. The three maps I have created represent "Black Alone", "Asian Alone", and "Other Race Alone" respectively. The data displayed is divided by county, and shows the percentages of each demographic ("Black Alone", "Asian Alone", and "Other Race Alone") that is located within each county. The percentage is calculated by taking the county population of each demographic and dividing it by the total county population. The legend shows that the higher the percentage of the particular demographic, the darker the color of the county. Some counties lacked demographic population data, so they are portrayed blank or white.

My overall impressions of GIS thus far are mostly positive. It amazes me how relatively user-friendly ArcGIS software is. As we have progressed in our labs, my completion of tasks in ArcGIS has become much quicker. Some may observe simplicity of programming as a negative trait, as those who perform GIS become less unique in their skills. However, ArcGIS seems to balance that trait with it's wide array of customization options. Thus, it seems that unskilled people can easily learn how to operate ArcGIS software, but it takes understanding of map presentation to make effective maps.

Lab #6: Digital Elevation Models

The following models represent an area near the Utah/Colorado Border. It is a sparsely populated mountainous region. The closest geographical feature is Rat Hole Ridge. I chose this area because its elevations seemed to suggest it would produce interesting and detailed maps.

Coordinate system ID WGS84:  4326

Extent in degrees
Top edge:  39.7477777772351
Bottom edge:  39.2155555549771
Left edge:  -109.612777776813
Right edge:  -108.658055554527