Chapter 8 Flashcards
- What is a network in GIS? What are junctions and edges in a network?
Broadly speaking, a network is a series of junctions and edges
connected together for modeling concepts.
* In a network system, nodes are represented by junctions and links are represented by edges.
- How is a street network modeled in GIS? What is the most important network property?
- In a GIS street network, each edge is a separate entity called line segments.
- What is the TIGER/Line dataset? Who produced this dataset? What is this dataset used for?
TIGER (Topologically Integrated Geographic Encoding and Referencing)/Line is a
geospatial database produced by the U.S. Census Bureau that contains line segments
that correspond with roads for the entire United States.
- What is geocoding in GIS?
Address matching, or geocoding, is the
process of using the text of an address to
plot a point feature at that location on a
digital map.
- Describe the process of geocoding. What is address parsing?
To perform geocoding, first you need to
have a reference database as a source.
2Nd: The next step is to make sure:
* All address information is correct.
* All addresses are in a consistent format.
* The address file is stored in a readable digital format (e.g., *.txt, *.csv, *.xlsx).
Address parsing is breaking an address into readable parts
- What does transit cost measure? What is transit cost in a street network used for?
- Transit cost measures the distance and travel time when moving through a particular edge.
- Transit cost is used to calculate the shortest path between two nodes.
- Shortest distance vs. shortest time
- Explain how transit cost and the Dijkstra’s algorithm are used to calculate the shortest path.
- The shortest path is computed using Dijkstra’s algorithm.
- Name three applications of network analysis in geospatial technology.
Apple Maps
google Maps
Waze
