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calc_kernel_map [2011/07/25 15:59] hermann created |
calc_kernel_map [2015/10/12 00:47] (current) admin |
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===== Description ===== | ===== Description ===== | ||
- | This functor calculates kernel density of an event map representing a point pattern. | + | This functor calculates [[wp>Multivariate_kernel_density_estimation|kernel density]] of an event map representing a point pattern. |
===== Inputs ===== | ===== Inputs ===== | ||
- | ^ Name ^ Type ^ Description ^ | + | ^ Name ^ Type ^ Description ^ |
- | | Events | [[Map Type|Map ]] | Map showing the events location. Events are represented by non null cells, indicating the number of occurrences on the cell. Cell values must be positive integer; otherwise an error will be reported. | | + | | Events | [[Map Type]] | Map showing the events location. Events are represented by non null cells, indicating the number of occurrences on the cell. Cell values must be positive integer; otherwise an error will be reported. | |
- | | Bandwidth | [[Double Type|Double ]] | The bandwidth is the radius (in meters) of a disc centered on each cell within which events will contribute to the Kernel estimate. | | + | | Bandwidth | [[Real Value Type]] | The bandwidth is the radius (in meters) of a disc centered on each cell within which events will contribute to the Kernel estimate. | |
===== Optional Inputs ===== | ===== Optional Inputs ===== | ||
- | ^ Name ^ Type ^ Description ^ Default Value ^ | + | ^ Name ^ Type ^ Description ^ Default Value ^ |
- | | Mask | [[Map Type|Map ]] | A map used to mask the distance calculation on its null cell areas. Data cell type of this map must be "Signed 32 Bit Integer" or an error will be reported. | None | | + | | Mask | [[Map Type]] | A map used to mask the distance calculation on its null cell areas. Data cell type of this map must be "Signed 32 Bit Integer" or an error will be reported. | None | |
- | | Null Value | [[Int Type|Int ]] | The bandwidth is the radius (in meters) of a disc centered on each cell within which events will contribute to the Kernel estimate. | -9999 | | + | | Null Value | [[Integer Value Type]] | The bandwidth is the radius (in meters) of a disc centered on each cell within which events will contribute to the Kernel estimate. | -9999 | |
===== Output ===== | ===== Output ===== | ||
- | ^ Name ^ Type ^ Description ^ | + | ^ Name ^ Type ^ Description ^ |
- | | Kernel Density Map | [[Map Type|Map ]] | Output map showing the kernel density estimate for each cell. | | + | | Kernel Density Map | [[Map Type]] | Output map showing the kernel density estimate for each cell. | |
===== Group ===== | ===== Group ===== | ||
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The technical aspects of the algorithm that calculates kernel density was extracted from Bailey & Gatrell (1995) and uses the quartic Kernel function. | The technical aspects of the algorithm that calculates kernel density was extracted from Bailey & Gatrell (1995) and uses the quartic Kernel function. | ||
- | ==== Notes ==== | + | ==== Referências ==== |
Bailey, T. and Gatrell, A., 1995: Interactive Spatial Data Analysis. Longman, Harlow. | Bailey, T. and Gatrell, A., 1995: Interactive Spatial Data Analysis. Longman, Harlow. |