Lab 5

October 28, 2009

I decided to use 5 classes on my map because I have 67 counties for Florida. I felt to see more of a variation I would need to have more classes. The classification I chose was quartiles and then changed the first break value to 0.  I like how it divided up the numbers. The equal interval, natural break, and defined interval you did not see much of a change in each of the breaks. There was two much of one color. I chose a color scale that only had similar color so you can see the change.

 FL_Pop_Ch_90_00

            For the second map I first made a new field in the attributes table. In this field I calculated 2000 population – 2008 population to get the difference between the two years. I then went to create the map. I chose to classify the numbers the same way I classified the other map using quartiles. I changed the first break value to 0. I chose to have 5 different classes. The symbol size ranged from 4 to 12.  I like how it divided up each of the classes. The other classifications did not show a very big difference between the populations. The color I chose for the state was a light pink. The color I chose for the symbols is a dark green. I felt these two colors together made the map pop out at you.

Total_Pop_Chg

Lab4 Blog

October 20, 2009

For this part of the lab I chose to use this projection.

NAD_1983_Florida_GDL_Albers

Projection: Albers

False_Easting: 400000.000000

False_Northing: 0.000000

Central_Meridian: -84.000000

Standard_Parallel_1: 24.000000

Standard_Parallel_2: 31.500000

Latitude_Of_Origin: 24.000000

Linear Unit: Meter

GCS_North_American_1983

Datum: D_North_American_1983.

The Florida central meridian is -81

This projection is good because it is especially for Florida.

This lab was somewhat difficult for me. I had a hard time inputting the data into ArcMap. My files had spaces in them. I had to go back and change all of my file names so they would not have any spaces in them. Other than that I had no other problems with this lab.

ArcGIS terms:

  • DBF/Dbase files
    • A database program whose file format has been adopted for the shapefile data model and tables in ArcGIS
  • Select by Attributes
    • To choose a subset of features or table objects based on the values in one or more attribute fields
  • Query
    • An operation to extract records from a database according to a specified set of criteria
  • Fields (in a table)
    • A single column of information in a data table
  • Records (in a table)
    • A row in a table containing one object
  • Attributes
    • Information about map features stored in columns of a table
  • Relational Database
    • A database that stores information in tables and constructs temporary relationships between them
  • Join function
    • The temporary combination of data from two tables based on a common attribute field or location
  • Monitor Fire
    • I am not sure about the answer. It is when the computer monitor catches on fire.
  • Calculate/Field Calculator
    • This helps you do calculation using different fields. We used this in the lab to figure out percent change between different years.

I found most of my answers out of my GIS book. “Mastering ArcGIS” by: Maribeth Price

Lab 3 Notes

September 30, 2009

This lab was very frustrating. The state I chose was Florida, it has to many counties. I should have chosen a state with less counties. The data from the internet is so messed up, I did not like converting all of these. My data for 1900 to 1990 was some what ok, it was already a text file so I did not really have to change much. It was already in text width and I just had to move the different columns. 

The data for 2000 and 2008 was very frustrating a messed up. For the 2000 data I had to type in the rest of the population numbers because all of them got cut off. The 2008 data was the same way except the population was on another line so I had to move all those up to line next to the counties. I’m just glad I did not have to do this for the entire United States.

I could not image having to do that to every state in the United States. It would take me a very long time to do. It would probably give me a big headache.

Hello world!

September 28, 2009

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