GIS Basics
What does GIS stand for?
Geographic Information System
Is this a good or bad path, and why? C:\Users\Chip\Desktop\School\GIS 201\Lab07\My_Lab_07_On_GPS_Coordinate_Systems
Oh lawdy why would you even use that it breaks like every Mel & Russ rule.
What is the difference between Raster and Vector data?
Vector: Points, lines, polygons
"Raster is faster but vector is better"
What are the different data types other than Interval?
Nominal, Categorical, Ordinal, Ratio
How do you fix GPS error caused by clouds?
You don't, clouds don't cause GPS error.
Whats the difference between a small scale map and a large scale map?
Small scale shows a large area (1:50,000,000), whereas large scale shows a small area (1:500).
What is metadata?
Data about the data. Who/what/where/when/how
How many attributes can one cell of a raster hold?
One/1/Uno/Un
What is the difference between interval and ratio data?
Ratio data has a significant zero point, whereas interval has an arbitrary zero.
How many satellites do you need for an accurate 3D position?
Four/4/quattro/quatre
How many fields can a single attribute have?
Unlimited
Why should you not upload a *.mxd file for Mel to grade your lab from?
*.mxd files store collections of data for viewing and analysis, but does not actually store data.
What are four different ways to display raster data?
Classified, stretched, image display, RGB composite, Index color, Landsat Band Combinations
What are the map types that correspond with the different data types?
Nominal & Single Symbol, Categorical & Unique Value, Ordinal/Interval/Ratio & Quantities(Graduated color, graduated symbol, dot density)
What are the three grades of GPS receivers in order of precision(least to greatest)
Handheld, mapping, surveying
What are the three parts of the GIS process?
Data acquisition, data processing, information output
What does a *.lyr file store?
It stores the layer symbology.
Whats the difference between Discrete and Continuous data?
Discrete represents objects as lines or polygons, has relatively few values that may change abruptly at boundaries, and adjacent cells often have same values. Continuous data has thousands or millions of potential values, few adjacent cells have same values, and values may change rapidly from cell to cell.
What are four of the different ways to classify data?
Jenks (natural gaps in data), Quantile (same # of features per class), Equal Interval (User specified, data divided equally into spaced classes), Defined Interval (User chooses class size, data determines # of classes), Standard Deviation, Geometric Interval (Based on geometric progression.)
What is WAAS, and how does it work?
Wide Area Augmentation System made for civilian aviation, uses a network of ground-based reference stations and geostationary satellites to improve GPS accuracy.
What three things are necessary for Geographic Data?
Spatial data, attribute data, metadata
What are the three file extension needed for a Shapefile?
*.shp—The main file that stores the feature geometry; required. *.shx—The index file that stores the index of the feature geometry; required. *.dbf—The dBASE table that stores the attribute information of features; required.
Whats the difference between Thematic and Image rasters?
Thematic rasters contain quantities that represent map data. Image rasters contain satellite or air photo data, cells of images represent brightness.
Give an example of the five different data types.
INSERT CORRECT ANSWERS HERE
What are the different GPS systems, and what countries own them?
NAVSTAR GPS (USA, fully operational)
GLONASS(Russia, fully operational)
Galileo (EU, regionally operational)
BeiDou (China, regionally operational)