Kernel Density Estimation
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| What is kernel density estimation (interpolation)? | method for discrete point data
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| What is continuous data? | Exists everywhere on the surface of the Earth
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| What is discrete data? | Exists at a specific location
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| What happens when you apply kernel estimation to discrete data? | Get raster of cells with density values
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| How do we go from discrete to continuous surface using kernel density estimation? | Place a 3-dimensional kernel function over each point so that the point is in the center of the kernel function
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| How do you calculate the density for a grid cell? | Take the cumulative distance of all the 3-dimensional kernel functions that are above the center of cell
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| What does it mean if you have a grid cell with a high density? | High concentration
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| What are the six kernel functions? | normal, quartic, triangular, negative exponential, and uniform
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| Which two functions should you use? | Normal or quartic
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| What is bandwidth? | The distance from the center of function to outer edge
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| What are two characteristics of a long bandwidth? | flat and generalized
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| What are two characteristics of a short bandwidth? | tall and less generalized results
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| How many bandwidth options are there? | 2
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| Which bandwidth option do you vary the bandwidth by specifying the minimum number of points falling under each kernel function? | Adaptive
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| Which bandwidth option do you vary the bandwidth by specifying the bandwidth to a value and having all kernel functions drawn to the value? | Fixed
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| If you specify a large number of points to fall under your kernel function, how will it look? | Long and more generalized
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| If you specify a small number of points to fall under your kernel function, how will it look? | Short and more detailed
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| Which bandwidth type is preferred? | Adaptive
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| How should you set the minimum number of points that you want to fall under your kernel function? | Using a few percent of the entire points, like 2 or 3%
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| Will changing the cell size change the results or how they are visualized? | How they are visualized
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Created by:
aley1
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