Extended Tools In Remote Sensing_book 5

24 Questions

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Extended Tools In Remote Sensing_book 5

Image Analysis, Orthorectification, Feature Extraction, Vegetation and Mapping, Image Enhancement


Questions and Answers
  • 1. 
     Satellite images made up of three or more bands of data area called
    • A. 

      Air photographs

    • B. 

      Multispectral images

    • C. 

      Single band imagery

    • D. 

      Subset images

  • 2. 
     A “clipped” portion of an original image data layer is called a(n)
    • A. 

      Air photograph

    • B. 

      Multispectral image

    • C. 

      Single band image

    • D. 

      Subset image

  • 3. 
     The process of joining together two or more georeferenced image data layers into a single data layer is called
    • A. 

      Clipping

    • B. 

      Georeferencing

    • C. 

      Mosaicking

    • D. 

      Reprojecting

  • 4. 
     What Image Analysis tool is used for feature extraction?
    • A. 

      Categorization tool

    • B. 

      Clip tool

    • C. 

      Control point tool

    • D. 

      Seed tool

  • 5. 
     What type of analysis allows you to find all areas of an image that have the same pixel characteristics?
    • A. 

      Image subsetting

    • B. 

      Mosaicking

    • C. 

      Orthorectification

    • D. 

      Supervised classification

  • 6. 
     The process of examining infrared satellite images to determine regions of vegetation health and stress is called
    • A. 

      Change detection

    • B. 

      Image categorization

    • C. 

      Normalized Difference Vegetation Index

    • D. 

      Orthorectification

  • 7. 
     The process of examining two images or feature layers of the same area over a period of time is called
    • A. 

      Change detection

    • B. 

      Image categorization

    • C. 

      Normalized Difference Vegetation Index

    • D. 

      Orthorectification

  • 8. 
     The process of dividing pixel values in an image into a specified number of classes is called
    • A. 

      Change detection

    • B. 

      Image rectification

    • C. 

      Supervised classification

    • D. 

      Unsupervised classification

  • 9. 
     The process of reorganizing a histogram range in order to emphasize or de-emphasize land features in an image is called
    • A. 

      Change detection

    • B. 

      Histogram stretch

    • C. 

      Image categorization

    • D. 

      Image rectification

  • 10. 
     The process of reversing the pixel values of an image to create a negative of the original image is called a(n)
    • A. 

      Image categorization

    • B. 

      Image rectification

    • C. 

      Invert stretch

    • D. 

      Standard deviations stretch

  • 11. 
     The process of applying a filter to an image to make it appear clearer is called
    • A. 

      Image rectification

    • B. 

      Image re-resolution

    • C. 

      Sharpening

    • D. 

      Stretching

  • 12. 
    The process of applying a filter to an image to lesson the amount of speckle is called 
    • A. 

      Image rectification

    • B. 

      Sharpening

    • C. 

      Smoothing

    • D. 

      Stretching

  • 13. 
     What is the best example of when feature extraction analysis would be needed?
    • A. 

      To identify the extent of an oil spill in the ocean

    • B. 

      To identify land cover types in a county

    • C. 

      To identify the locations of all railroads in a county

    • D. 

      To identify the locations of all owl nesting grounds in a state

  • 14. 
     What is the best example of when supervised categorization analysis would be needed?
    • A. 

      To identify precipitation values for a county

    • B. 

      To identify land cover types in a county

    • C. 

      To identify the locations of all railroads in a county

    • D. 

      To identify the locations of all wetlands in a county

  • 15. 
     What is the best example of when unsupervised categorization analysis would be needed?
    • A. 

      To identify the extent of an oil spill in the ocean

    • B. 

      To identify land cover types in a county

    • C. 

      To identify the locations of all railroads in a county

    • D. 

      To identify the locations of all owl nesting grounds in a state

  • 16. 
     What is the best example of when change detection analysis would be needed?
    • A. 

      To identify the extent of an oil spill in the ocean

    • B. 

      To identify land cover types in a county

    • C. 

      To identify the reduction or addition of all railroads in a county

    • D. 

      To identify the loss of wetlands in a county

  • 17. 
    • A. 

      orthorectification is performed on feature data and rectification is performed on image data.

    • B. 

      orthorectification is performed on aerial photographs and rectification is performed on satellite images.

    • C. 

      rectification can only be performed using Image Analysis extension program.

    • D. 

      orthorectification uses elevation data to account for the natural variation in the Earth’s surface.

  • 18. 
    What is the best example of when using an invert stretch on an image would be needed? 
    • A. 

      When only a photograph negative is available

    • B. 

      When you want to change the image bands used

    • C. 

      When you want to clip an image to a smaller geographic extent

    • D. 

      When you want to perform a resolution merge

  • 19. 
     When performing orthorectification, geocorrection properties must be entered with regard to the camera used for data collection because
    • A. 

      cameras are not typical geographical data collection devices.

    • B. 

      cameras or sensors have a certain amount of error or discrepancy related to them.

    • C. 

      certain remote sensing data collection projects (NAPP, NHAP, etc.) have error associated with them and others do not.

    • D. 

      regular, commonly-used cameras have error associated with them and professional, GIS-used cameras do not.

  • 20. 
     When orthorectifying an image, it is best to select control points that are not clustered together because
    • A. 

      the portion of the image where the control points are located would be closely aligned and the rest of the image would be highly distorted.

    • B. 

      this would cause a runtime error and the program would shut down and cause you to lose all associated data.

    • C. 

      the portion of the image where the control points are located would be highly distorted and the rest of the image would align properly.

    • D. 

      the portion of the elevation data for the rest of the image would be reprojected based on the image projection causing problems for future analysis.

  • 21. 
     When orthorectifying an image with a geographic extent that extends beyond one quarter quadrangle of area, you may need to mosaic the digital elevation models (DEMs) to use for the analysis because
    • A. 

      non-mosaicked data cannot be used for this analysis.

    • B. 

      the coordinate system for the DEM must be the same as the coordinate system of the image.

    • C. 

      the coordinate system for the DEM must differ from the coordinate system of the image.

    • D. 

      the geographic extent of the elevation data must be at least that of the study area.

  • 22. 
     Specifying a larger seed radius in Seed Tool Properties typically causes a larger polygon to be drawn because
    • A. 

      the seed radius specifies the number of pixels that can be used to establish the range of pixel values that will be used to draw the polygon.

    • B. 

      the seed radius specifies the size of the polygon to the drawn.

    • C. 

      the seed radius specifies whether you will click a single polygon or draw a rectangle to establish the pixel value range.

    • D. 

      smaller seed radiuses may cause longer analysis processing times

  • 23. 
     Clicking a single pixel rather than dragging a box when using the Seed Tool typically causes a smaller polygon to be drawn because
    • A. 

      the seed radius would automatically become smaller.

    • B. 

      the seed radius would automatically become larger.

    • C. 

      the number of pixels used to build the pixel value range would be smaller.

    • D. 

      smaller polygons can cause longer analysis processing times.

  • 24. 
    A resolution merge can greatly enhance an image because 
    • A. 

      it can increase the resolution of a low-resolution image

    • B. 

      it can use the real color of a low-resolution image to enhance a monochromatic high-resolution image.

    • C. 

      it can change a satellite image into a aerial photograph.

    • D. 

      it allows you to hand color an image using Drawing tools.