Analog/digital - Intro GIS and Quieries Flashcards
What are attributes?
Provides information about an object
What is the purpose of spatial data models?
To create a relationship between theory and reality
What is an object model?
Entity model
What is space?
A collection of self contained objects and relationships between them
What describes objects?
Attributes
What is location?
A description of where a thing is
Representations are used to implement ___________.
Data models
Define vector.
Vectors are point based. A point can exist on its own or be connected to another point to make a line or polygon.
GIS uses _______ to show spatial data.
Layers
What are some real life examples of point data?
Trees Houses Bike racks Traffic lights Fire stations
What are some real like examples of line data?
Roads
River systems
What are some examples of area data?
Forest inventory polygons Lakes Census Watersheds Parks
What is a raster?
Created by pixels and cells. Every pixel has its own value
Can raster and vector be combined by GIS?
Yes
Objects always have attributes. What is an example of this
A tree is the object, species is the attribute
A field model feeders to…
Object attributes
What are the ends of lines called in vectors?
Nodes
True or false
Lines can be called arcs
True
A pixel is a ________.
Square
Resolution is displayed as a single value, what does this value mean?
The value represents the side lengths. Not the area
What is an outlier.
A piece of information that doesn’t fit the trend
What do spatial data queries refer to?
The process I retrieving data from a layer by searching for a specific feature
True or false
GIS can be described as a spatial database
True
Define topology.
Science and mathematics of relationships (geometry)
Topology is associated with _______ representation
Vector
Will topology function if lines are not connected on the GIS
No
True or false
Topology will snap together fragmented lines
True
What are two searches on GIS ?
Select by attributes
Select by location
What is a proximity selection?
Searching based on an objects closeness to the source
What does adjacency/contiguity mean?
A shared boundary, two objects touching
