GIS 201 chapter 14
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GIS 201 chapter 14
Terms and concepts from chapter 14 of the Price text.
What are the 3 types of geodatabases?
What are the characteristics of a personal geodatabase?
Designed for use by individuals or small workgroups
Stored in a single Microsoft Access file
Limited to 2 GB in size
Works only in the Windows operating system
What are the characteristics of a file geodatabase?
Designed for use by individuals and small workgroups
Each data set stored as a separate file within a system folder
Limited to 1 terabyte in size
Works with different operating systems
What are the characteristics of an SDE geodatabase?
Designed for many users or large workgroups
Stores GIS data within one of several commercial RDBMSs (such as Oracle, SQLServer, or IBM Informix)
AKA organizational databases or enterprise GIS
Requires a software package called the Arc Spatial Database Engine (ArcSDE) to translate geographic data into a consistent and customized format in the large database.
What is a feature dataset?
A collection of related feature classes with the same coordinate system.
What is the database schema?
The design and structure of a database, incl. the datasets and feature classes, the fields in the tables, the standalone tables, the relationships between them, and other objects.
What are the 2 components of the spatial reference?
Domain and resolution.
What are the 2 types of domains?
Range (specifies the lowest and highest possible values but allows anything in between)
Coded (allows only certain specific values)
What are the 3 types of split policy?
Default (both split feature attributes contain the default value established for that field)
Duplicate (both features retain the value of the original feature)
Geometry Ratio (new value is assigned based on the relative size of the original and split features)
What are subtypes?
Formal classes of features within a layer.
What is annotation?
A feature class that stores labels.
With feature-linked annotation, will deleting the feature delete the annotation?
Yes, and vice versa.