Chapter 1. Authoring Geodatabases
For a very long time, mankind recorded historical events in the form of drawings, inscriptions, and books. Books were organized into physical volumes, and volumes were arranged by their topic on shelves in a library. This system worked very well for centuries. We can place as many books as the shelf space can handle. With the information age and the invention of the byte, data is stored and retrieved electronically. It started with simple sequential text files. As more complex structures were introduced, we started depending on computers to store our data. This required a completely new system to structure, organize, and manage the digital data. For this, a system by which computers can efficiently browse and retrieve stored information was required, which led to the invention of the database.
Note
A database is an organized collection of related data that's designed for efficient storage and retrieval. In this system, data is stored in a series of relations called tables. Each table contains a set of related data, where a row contains one instance of data and a column contains information that describes that instance.
Many database management systems (DBMS) have been introduced over the years. They have all been designed to organize digital information. When networking came into the picture, DBMSs evolved; now, multiple users can read the same piece of information from different locations (or from different continents). They can update the same table; therefore, the multiediting environment, database replications, and other niche technologies spawned from this field.
Note
DBMS is a software that allows multiple users to interact with a database. They come either in the client-server model or the file-based model. These may include the server, which manages the database and listens for incoming client connections, and the client, which connects to the server.
After that short tour of the evolution of databases, we need to focus on the topic of this book. A database is a fascinating storage system. It allows you to retrieve, store, and edit different types of information such as text, images, music, and videos. However, for people like us who work with maps, we feel there is a missing element in that compound, that is, location. Adding location information to a database helps applications bring life to the tabular records in the database and make it available visually. For instance, you can add x and y columns to a Restaurant table in a database, which represents the coordinate's location of each restaurant in the table. Then, you can write a custom application to read the coordinates and display the restaurants in a map. Esri realized the importance of injecting location information into a database, and created its own standard location-based database; you guessed it, the ArcGIS geodatabase. An ArcGIS geodatabase offers you a generous number of geographically enabled objects called datasets.
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An ArcGIS geodatabase is the proprietary database for Esri. All Esri geospatial software is built around this geodatabase.
In this chapter, you will work on a real-life business case study where you will learn how to create your first ArcGIS geodatabase and add different datasets using ArcGIS for Desktop, hereafter known simply as Desktop (uppercase). To start with this chapter, make sure you have a machine with Desktop 10 or higher. You can work with a 9.2.x or 9.3.x Version of Desktop since the underlying geodatabase is the same; however, you might be missing some features that are required to perform the exercises of the book. I will be using Version 10.2; you can download the latest version of ArcGIS for Desktop for free with a 60 day trial from the Esri website at http://www.esri.com/software/arcgis/arcgis-for-desktop/free-trial. You will need at least a standard or an advanced license, which will allow you to edit.
Note
The ArcGIS geodatabases authored in 9.2 and 9.3.x can be viewed and edited in ArcGIS 10.x. However, it is recommended that you use 10.x geodatabases during the course of this book to maintain a consistent flow and error free exercises.