ex3

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The flashcards below were created by user natelh on FreezingBlue Flashcards.


  1. What is displayed on screen when one zooms too far in to a raster image?Selected  Answers: It becomes better resolved, It appears as large, almost indistinguishable pixels; It becomes inverted It becomes very small
    Answer: It appears as large, almost indistinguishable pixels
  2. The difference between vector and raster data is... Answers: aVector data is stored in header files;b Raster data are stored in cells using an x-, y-, z- coordinate system c Vector data is useful for displaying image files;d Raster data are mainly used for spatial analysis e Vector data is stored as coordinate points; Raster data are stored in cells using a grid-coordinate system. Raster data is stored as coordinate points; Vector data are stored in cells using a grid-coordinate system.
    Selected Answer: Vector data is stored as coordinate points; Raster data are stored in cells using a grid-coordinate system.
  3. Bi-Level scanned images...Answers: a assign node values b assign cell values of 1 through 10 assign x-, y- coordinates, rather than cells d assign only cell values of 1s and 0s
    Selected Answer: assign only cell values of 1s and 0s
  4. The acronym DEM stands for
    Digital Elevation Model
  5. In vectorization...
    Selected Answer: features are reduced to 1-cell thick and an arc is generated down the center of the cell
  6. the _________ program has produced the most widely-used imagery worldwide.
    Selected Answer: Landsat
  7. Which of the following are not encoded into raster data
    TINs
  8. SRTM DEMs, which cover over 80% of the landmass of the earth between 60 degrees North and 56 degrees South, are updated every year. True or false
    FALSE
  9. Precipitation would best be represented by raster, rather than vector data. True False
    True
  10. In rasterization...
    Selected Answer:a cell is placed around each coordinate and is given a value of 1
  11. Cells with 30 meter resolution cover _______meter on the ground
    900 square
  12. Multi-band raster cells are distinguished from all other raster cells by being multi-colored, True or False
    FALSE
  13. Which of the following is a major disadvantage of using weather satellite imagery in most GIS mapping applications
    The resolution is too coarse
  14. The data structure which most efficiently stores Bi-level data is cell-by-cell encoding  True or False
    FALSE
  15. Raster data generally takes up more file space than vector data represent at the same scale True or False
    TRUE
  16. Aerial photos that have been processed to remove displacement from camera tilt and terrain relief are called ______________ DEMs
    DEMs
  17. What was the first satellite with Thematic Mapper, which records data in several bands
    Landsat 4
  18. One advantage that raster data has over vector data is that raster data ...
    can be used for spatial analysis
  19. Aerial photos that have been processed to remove displacement from camera tilt and terrain relief are called ______________
    DOQ's
  20. Vector data uses __________; Raster data uses____________
    x-,y- coordinates; grid coordinates

Card Set Information

Author:
natelh
ID:
328221
Filename:
ex3
Updated:
2017-02-08 09:25:49
Tags:
GIS
Folders:

Description:
GIS
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