Notes for Exam 1
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
|
|
||||
|---|---|---|---|---|---|
| What is Geographic Information Systems? | An electronic map tied to a database.Needs: Hardware, Software, Data, People
🗑
|
||||
| When did GIS begin? And where? | IT began to take off between the 1950's and 60's using a computer. Canada.
🗑
|
||||
| Who is the godfather of GIS? | Dr. Roger Tomlinson, tried to put all maps put into computer.
🗑
|
||||
| Types of Key maps. | Scanned maps, Vectorized scanned maps, topological systems, attribute table.
🗑
|
||||
| What institute brought people together? | Harvard.
🗑
|
||||
| What was the name of the first GIS software package? | Symap
🗑
|
||||
| Jack Dagermond made which company? | Environmental Systems Research Institute (ESRI)
🗑
|
||||
| What is a map? | A map is a 2-D representation of something on the surface of the earth.
🗑
|
||||
| What is looked for on a map? | Distance, Direction, Size, Shape
🗑
|
||||
| Types and definition of types of maps | General- emphasis on location, Thematic- single subject
🗑
|
||||
| What is a scale? | the relationship between distance measured on the map and distance on the ground.
🗑
|
||||
| 3 types of scales | Graphical scale- graduated bar, Verbal scale-linch=200feet, Fractional scale- compares map distance to ground distance by proportional numbers and is expressed as a ratio.
🗑
|
||||
| What are the 7 map essentials? | Scale, Title, Date, legend, direction(north arrow), location material, metadata(data about data- who created it? where did it come from?)
🗑
|
||||
| What are 3 datums? | NAD27, NAD83, WGS84
🗑
|
||||
| By how many feet are NAD and WGS off? | 200 feet
🗑
|
||||
| Explain a Mercater map. | Preserves direction and shape. Sacrafices distance and area
🗑
|
||||
| Explain a Peters Projection map. | Preserves area. Sacrafices shape distance and direction.
🗑
|
||||
| What does an overlay have? | Projection, coordinates, data
🗑
|
||||
| Measurments north and south of equator. | Latitude
🗑
|
||||
| Angular measurements west and east if prime meridian. | Longitude
🗑
|
||||
| What is a project? | multiple data sets, symbology, layouts, pathes
🗑
|
||||
| What is data? | Indivual themes
🗑
|
||||
| What is a Raster Model? | deals with pixels, overlay a grid on map
🗑
|
||||
| What is a Vector Model? | -Points (X,Y) coordinates-lines, series of points-polygons, an enclosed line
🗑
|
||||
| Examples of Geographic Data | location, points lines, polygons, pixels
🗑
|
||||
| Name types of Geographic Attributes | Descriptions linked to location, nominal, ordinal, interval, ratio
🗑
|
||||
| What is Nominal? | One that serves only to identify and entity from another
🗑
|
||||
| What is Ordinal? | Values that have a natural order
🗑
|
||||
| What is an interval? | Value differences make sense
🗑
|
||||
| What is a ratio? | Simular to interval has no arbutary zero
🗑
|
||||
| What is data classification? | Group the data 3-10
🗑
|
||||
| What is equal interval? | dividesthe full range of attributes into equally sized subranges.(good for presentations)
🗑
|
||||
| What is quantiles? | ID breakpoints between classes so that each subclass ha the same amount of data.
🗑
|
||||
| What is natural breaks? | Using statistics ID breakpoints between classes to form subgroups "naturally"
🗑
|
||||
| What is frequency distribution? | an ordered array that shows the frequency of occurance of each value.
🗑
|
||||
| What is a Histogram? | Graphical frequency distribution
🗑
|
||||
| Make a histogram using these numbers 1,1,2,4,5,7,11,15,16,16,16,20,22,22,23,26,27,29,30,30 | 0-5=5=.25, 6-10=1=.05, 11-15=2=.1, 16-20=4=.2, 21-25=3=.15, 26-30=5=.25
🗑
|
||||
| What is mode? | Most frequent number
🗑
|
||||
| What is the median? | Middle number (make sure to put number in order)
🗑
|
||||
| What is mean? | Average
🗑
|
||||
| Find the mode, median, mean, standard deviation, +1s, -1s, and final answer of 100,90,80,75,20 | mode=0 or all, median=80, mean=73, standard deviation=31.14, +1s=104.14, -1s=41.85, final answer=4 out of 5 data are within +/-1s
🗑
|
||||
| What is topology | branch of mathematics that deals with relationship between points. (points-nodes) (lines-arcs) (polygon in 2-d space)
🗑
|
||||
| What is a node? | point created by intersecting lines or at the beginning or end of line.
🗑
|
||||
| What is connectivity? | ID of interconted lines.
🗑
|
||||
| What is Contiguity? | ID of which polygons touch each other(shared arcs)
🗑
|
||||
| What is Area Definition? | ID of areas by a set line.
🗑
|
||||
| Who created the GPS? | Department of defense.
🗑
|
||||
| How many satellites are used for GPS? How many are needed? | 24 used, 21 needed
🗑
|
||||
| 3 things on a satellite | computer-flight and function of satellite, Atomic clock- accurate time, Radio transmitter-signals
🗑
|
||||
| Advantages and disadvantages of a C/A code | Advantage- quick, disadvantage- less accuate than P code, and can be jammed or spoofed
🗑
|
||||
| Advantages and disadvantages of P code | more accurate, not difficult to spoof or jam
🗑
|
||||
| Control segment interference to satellites | control staions
🗑
|
||||
| What does a receiver do? | receieves data
🗑
|
||||
| approx. position of satellite | almanac
🗑
|
||||
| Precise position of satellite | Ephemeris
🗑
|
||||
| How many satellites for Location? | 3, lat/long
🗑
|
||||
| How many satellites for position? | 4, lat/long and elevation
🗑
|
||||
| What is a waypoint? | Stored location in receiver.
🗑
|
||||
| What are WAAS? | signals from airport, produced by FAA
🗑
|
||||
| What is differential GPS? | loading your waypoints to compare with stored location
🗑
|
||||
| Convert 43degrees 41min 31sec to decimal degrees | 43.0753
🗑
|
||||
| Convert 89.40062 to DMS | 89degrees 24min 2.32sec
🗑
|
||||
| Air photo with coordinates | Digital orthophoto quad (DOQ)
🗑
|
||||
| can see elevation | Digital Elevation Model (DEM)
🗑
|
||||
| series of vectors | Digital Line Graph (DLG)
🗑
|
||||
| topographic map | Digital Raster Graphic (DRG)
🗑
|
||||
| Metadata needed to document | ID info, Data quality, Spatial data org, Spatial ref. info, entity and attribute, distribution info, metadata ref. info
🗑
|
||||
| Title area covered keyword | ID info
🗑
|
||||
| Horizontal and vector accuacy, completeness | Data Quality
🗑
|
||||
| Raster/Vector | Spatial data org.
🗑
|
||||
| lat/long, coordinate, projection, data | Spatial ref info
🗑
|
||||
| Definition of entity and attributes | entity and attribute
🗑
|
||||
| Fees, files format | Distribution info
🗑
|
||||
| Who created the metadata? | Metadata ref info
🗑
|
Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Created by:
jrw4274
Popular Geography sets