Spatial/Demographic Analysis: Graduated Color

Aim:

To create perform demographic analysis on Census 2011 data through ArcGis symbology tools and spatial join methods.

Procedure:

Step 1: Map Input

Census Data: Census or demographic data on which analysis will be performed.  For this session, The Census data of Tamilnadu for the year 2011 was taken.

Location feature: Shapefile of the location feature. For this session, shapefile of Tamilnadu, India was processed.

Step 2: Map Processing

• ·         Perform a spatial join through a primary key id (Common ID) between the location shapefile and census dataset.  If the common ID is not present between data, create a FieldID and link the names of sub-features and districts of location and datasets, respectively. 
• ·         Select an attribute, and calculate a preferred deduced value using field calculation. For this session Female illiteracy as a percentage Total illiterate population was taken.
• ·         Using “Graduated Color” under quantities of symbology, display the female illiteracy percentage calculated. The number of classes, for display is scientifically computed as K = 3.3 Log N, where K is the number of classes and N is the total number of attributes in the location data set.  
• ·         Method of classification can differ from the quality of data type. For this session, Natural Breaks (Jenks) was considered.
• ·         Click “Ok” to generate the map output

Step 3: Map Display

Create Custom Map Layout with the necessary map elements and Export map to Jpeg format. 

Conclusion:

Demographic data is analyzed for female illiteracy rates and displayed using graduated colors in ArcGis 10.1.