Add Field of Table

By Kardi Teknomo, PhD.

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In the previous steps on this tutorial, you have many variables or fields in your map data. Those data include area and population. Now you want to solve this simple challenge: to make Choropleth map of Japan population density . The formula of density is very simple:

Density = Population / Administrative Area

How to Calculate Density from Population and Area in ArcGIS?

Before that answering that, you need to know how to add field of a table. There are two ways to add a field in your table:

1. Using ArcCatalog, click Preview Tab > Table > click Options > click Add Field in the popup menu. Then put the name of the field and type of variable

2. Similarly, you can use ArcMap : click the layer > then right click to get the menu, click Open Attribute Table. Table will appear and click Options then Add Field

Now you know how to add a field in your table. The next step is to fill this field with your calculated values. Here is step by step:

1. Layer > Open Attribute Table > Option > add field “Density” ([In ArcMap, Start Edit session)
2. Right click on the new field > Calculate Value
3. In Field Calculator: use Density = Pop_Admin/sq_Km

To make the Choropleth map, you can refer back the previous step of this tutorial.

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This tutorial is copyrighted.

Preferable reference for this tutorial is

Teknomo, Kardi. Introduction to GIS. http:\\people.revoledu.com\kardi\ tutorial\GIS\