(Stars)extended Tools In Remote Sensing_book 5
Image Analysis, Orthorectification, Feature Extraction, Vegetation and Mapping, Image Enhancement
- 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.Orthorectification differs from rectification because
- 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.
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