Above is a map of the United States divided into counties of each state. Highlighted purple are Arizona and Colorado, the two states that I am collecting data for. Highlighted red are the three states I chose to include to reference the location of my two states on a smaller scale.
Above is a map of Arizona, Colorado, Utah, Nevada, and New Mexico. As mentioned above, my two states, Colorado and Arizona, are highlighted in purple to show that these are the two states that I am gathering data for. Again, the red states are simply for reference.
Above is a map of my two states separated into counties which I have collected population data for. In this lab, I have imported my gathered population data for every census year since 1900 into ArcMap and calculated population change between each of those years.
For my projection, I chose Albers Equal Area Conic projection based on the USGS. This projection is widely used to represent the United States of America It is hard to tell what it looks like from my small scale maps, so here is a picture of what North America looks like in this specific projection:
According to the ArcGIS website, "This conic projection uses two standard parallels to reduce some of the distortion of a projection with one standard parallel. Although neither shape nor linear scale is truly correct, the distortion of these properties is minimized in the region between the standard parallels. This projection is best suited for land masses extending in an east-to-west orientation rather than those lying north to south."
Definitions
.xls File- denotes that the file is an excel file.
Select by Attributes- This is a function in ArcMap that allows the user to highlight specific areas based on what they need out of a certain source of data. For example, we did not need the entire US map for our individual states, so we highlighted our specific states from the select by attributes menu and created a new layer from that containing only our select states.
Query- Query expressions are used in ArcGIS to select a subset of features and table records.
Field & Record- In ArcGIS, rows are known as records and columns are referred to as fields.
Attributes- Specific coding in the Select by Attributes menu that tells ArcaMap to perform a specific function, such as highlighting specific states.
Relational Database- a series of standard database tables, column types, indexes, and other database objects
Join Function- Allows you to, Through a common field, associate records in one table with records in another table.
Field Calculator- Allows you to perform a function similar to excel that will calculate the relationship between selected fields using different math functions understood by ArcMap.