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






2. When areas on a map maintain the same proportional relationship to the areas on the earth that they represent.






3. A 3-D frame of reference (model of the earth) used to determine surface locations.






4. Provide information about a particular topic or theme.






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






6. Triangulated Irregular Network.






7. The reverse of each other.






8. Description by name: ex London






9. Precision of a measurement with respect to time






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






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






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






13. The 5 __________: TTCETH - 1. Triangle table 2. Triangle-Node table 3. Coordinate table 4. Triangle-Edge table 5. Hull-Edge table.






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






15. Deliver location / topographic information.






16. 9 Features & Entities: 1. Mountains. 2. Rivers. 3. Forests. 4. Clouds. 5. ________. 6. Cities. 7. Populations. 8. Streets. 9. Fire Hydrants.






17. Smoothing & Shape abstraction.






18. Thematic map that uses dots to represent the frequency of a variable in a given area.






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






20. Map in which some thematic mapping variable is substituted for area (like a graph in a map)






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






22. Arcs only ___ at Nodes






23. Real Things (trees - forests - cities etc).






24. 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.






25. The nature of relationships & connectivity between them.






26. 1. E - Ellipsoid dimensions. 2. D - Datum origin. 3. A - Angular alignment.






27. To avoid corrupt data!






28. Lines that connect points of equal value.






29. 3 ______ attributes: 1. Values. 2. Relations. 3. Quality.






30. Global Positioning System.






31. Accuracy - reliability - responsibility.






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






33. LN 1. L - Level Surfaces. 2. N - NAVD88.






34. Explanatory list of symbols on a map






35. A map containing information on only one topic or theme.






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






37. User generated content (UGC). Volunteered geog. info (VGI). Professional vs amateur. Neogeography vs GIS.






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






39. Maps are restricted to a __________.






40. Application Programming Interfaces (increases access like my maps on google).






41. Converts what entities into objects in the computer 1. Geometry (points - lines - polygons). 2. Measurement of attributes. 3. Accuracy &/or error.






42. 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.






43. Digital Elevation Model






44. Blue - Green - Red - NIR....






45. 3 levels of _______:1. Conceptual - definitions - attributes. 2. Logical Model - formalize definitions & measures. 3. Digital Model - define & describe features.






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






47. Essentials of DBMS: Each record has a ________






48. GIS is not a ______






49. Data Modelling - Turning entities into complex objects (geometry - quality).






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