Test your basic knowledge |

GIS: Geographic Information Systems

Subject : it-skills
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. 2 ______: 1. Files/records. 2. Database/collection of files.






2. Identify unique points - patterns or features in space.






3. 7 Spatial Res: 30m Temporal Res: 16 day Swath Width: 183km






4. _________ of the Real World: (S&E - S&S - G&A) 1. Selection & Elimination. 2. Simplification & Smoothing. 3. Generalization & Aggregation.






5. Preserve Shape






6. Can assume all values between any two specific values. They are obtained by measuring.






7. To avoid corrupt data!






8. Area of the Earth that is displayed in each image






9. Defined by NOIR NOIR N-Nominal - qualitive data. O-Ordinal - order or ranking. I-Interval - numeric scale - arbitrary units. R - Ratio - fixed origin - continuous scale.






10. Preserve Direction






11. 2 ______: 1. Unique ID. 2. Type Code. 3 Spatial Components PLP 1. Point. 2. Line/arc. 3. Polygon/area.






12. The 4 elements or ______: 1. Cell Value - each cell carries a value. 2. Cell size - this determines the resolution. 3. Raster bands - Can have single or multiple bands. 4. Spatial Reference - Raster data must have spatial reference.






13. Most popular form of USGS Map


14. The reverse of each other.






15. Points - Polygons - Lines






16. Connect & travel between landmarks by moving thru space.






17. The smallest pixel size visible in an image - the limit of magnification






18. Assigning location information to text & discourse.






19. 3 levels of _______:1. Conceptual - definitions - attributes. 2. Logical Model - formalize definitions & measures. 3. Digital Model - define & describe features.






20. GIS is not a ______






21. Townships were six miles square - and were subdivided into 36 sections - each section consisting of one square mile. One section of each township was set aside to support public education - and the remaining sections were to be sold at public auction






22. 1. An array of regulary spaced cells or pixels. 2. Each cell holds attributes (values).






23. Are made with GIS






24. The 3 _____: 1. True. 2. Magnetic. 3. Grid.






25. 3 topological concepts: 1. Connectivity - arcs connect to each other at nodes. 2._______ - arcs that connect to surround an area define a polygon. 3. Contiguity - arcs have direction & left & right sides.






26. Points taken at regular intervals from the cumulative distribution function (CDF) of a random variable.






27. A Complete frame






28. GIS is ________ - spatial analysis & dependent on the computer.






29. GIS is ________






30. 2 common _______: 1. Vector. 2. Raster.






31. HAL - H-Human nature. A-Arbitrary/socially constructed. L-Loss of info (hiding variance within a class or group).






32. Title - legend or key - grid system - distance scale - direction and compass rose






33. Lines that connect points of equal value.






34. The range of wavelengths sampled by a remote sensor.






35. Provide information about a particular topic or theme.






36. 2 reasons why Topology matters: 1. Error detection. 2. ___________.






37. The ability to link files together.






38. An assignment of geographic coordinates to locations.






39. Precision of a measurement with respect to time






40. Files in the DB can be linked or joined using the _______






41. Explanatory list of symbols on a map






42. Sailors and pilots use these maps to navigate






43. Where 2 lines/arcs intersect - an endpoint - or a point along a line.






44. Uses coordinates (X -Y) to represent spatial features. Scale matters involve what Polygons<>points. Polygons<>lines.






45. 3 different types of ________ - content & services ICS I - Infrastructure (Hardware & Sensors). C - Content (sensors - APIs - UGC & VGI). S - Standards (or lack thereof): access - authority.






46. Assigning location information to various media (photos - video - music).






47. Consists of F & E: 1. Features. 2. Entities.






48. DBMS used for: _______ - access - organize & edit.






49. Connectivity: ___________. 3 elements 1. Nodes & vertices define the shape of the arc. 2. Arcs have a from-node (or starting node) & a to-node (or ending-node). 3. Arcs only join at nodes.






50. Classes based on natural groupings through examination of histogram (good: minimizes differences bad: data range uneven)