COCC GIS Analysis Midterm
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What are filters? | show 🗑
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| How are filters used for reclassification process? | show 🗑
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| show | *Static = Block Function (whole Neighborhood)
*Roving = Focal Functions (looks at each Kernel makes an evaluation, and moves on to next Kernel)
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| What are higher-level objects? | show 🗑
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| Give two examples of higher-level objects for each of the following feature classes: Points, Lines, Polygons | show 🗑
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| Explain why the analysis piece of GIS is often the most abused aspect and give an example to support your explanation. | show 🗑
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| show | Rate of Change as you move through space
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| How is slope implemented in a vector data model? | show 🗑
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| How is slope implemented in a raster data model? | show 🗑
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| show | * Formulating command statements that perform cartographic analysis. Creates new grids
* Raster Calculator tool contains the functions and is used to perform them
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| show | *Looks at single cell/kernel. The value in the output is contingent only on the input cell at that location.
* An example: Highest Position (conditional finds the highest point)
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| Name, explain and give an example of Focal functions | show 🗑
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| Name, explain and give an example of Global functions | show 🗑
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| show | *Aggregates neighborhoods to evaluate a value as a block. Blocks don't overlap, value in block computed and written to all cells of the block.
* Example Block Statistics-Mean (finds the mean of each neighborhood)
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| Name, explain and give an example of Zonal functions | show 🗑
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| show | * Arbitrary - random
* Causative – function about what is going on, movement
* Measureable – measuring out (or in) from a feature for informational purposes
* Mandated – buffer given by organization
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| show | * Range = Highest – lowest value. Shows the spread of the values
* Standard deviation = the average difference between frequencies
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| Give an example of a simple reclassification that aggregates two or more classes together into single class. | show 🗑
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| What is intervisibility analysis? | show 🗑
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| What is a viewshed? | show 🗑
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| show | Using TIN- Triangular irregular networks (TIN) functions
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| show | Using the extended neighborhood function
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| show | LOS for fire watch tower, location of cell tower
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| show | To measure the degree of fragmentation as the amount of perforation
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| show | Number of Holes and Fragments
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| Why is it important to be able to isolate, identify, count and separately tabulate and display individual items? | show 🗑
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| show | Simple Distance (Euclidian) is a straight line, regardless of barriers or impedance, direction and cost.
o Euclidean/isotropic
o Straight line distance
o Doesnât matter the direction you measure
* No factors adding to cost of movement
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| show | Functional Distance is a distance based on path, in one direction, with the least calculated cost.
o Anisotropic
o Measures in a specific direction
o Least cost paths
* Slope, friction, barriers, etc
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| What are some similarities and differences from simple and functional distance? | show 🗑
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| show | Absolute values within a dataset
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| What is Relative frequency? | show 🗑
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| What is/are the dimensions associated with points, lines and polygons? | show 🗑
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| What are three different measurements you could make on a line feature? | show 🗑
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| What are three different measurements you could make on a polygon feature? | show 🗑
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| show | Direction. We use Isotropic (example walking up and down a hill, use same cost value)
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| What are the differences between a Bar Chart and a Histogram? | show 🗑
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| show | *Top left-Natural Breaks
*Top right- Algorithimic progression
*Bottom left- Standard Deviation
*Bottom right- Equal or Quantil Interval
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