Changes between Version 4 and Version 5 of Processing/AplUserGuide
 Timestamp:
 Feb 7, 2012 11:53:22 AM (7 years ago)
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Processing/AplUserGuide
v4 v5 141 141 '''Nearest Neighbour''' 142 142 143 Mapping with nearest neighbour searches the neighbourhood around the grid cell and finds the closest point to this from the IGM file. The corresponding value from the level1 file is then used for this pixel. This option is selected using interpolation neareston the command line.143 Mapping with nearest neighbour searches the neighbourhood around the grid cell and finds the closest point to this from the IGM file. The corresponding value from the level1 file is then used for this pixel. This option is selected using {{{interpolation nearest}}} on the command line. 144 144 145 145 '''Inverse Distance Weighted''' 146 146 147 The inverse distance weighted algorithm first searches for, at most, the X nearest points within the maximum allowed search distance. The number X is specified from the command line in the interpolation option. Then when these points have been found it calculates a weight for each point and applies this to the value of the data from the level1 file. The weight for point i is calculated as (distance^−2 ) / (Sum distance^−2) . This option is selected using interpolation idw maxpointswhere maxpoints is the maximum number of points you want to use.147 The inverse distance weighted algorithm first searches for, at most, the X nearest points within the maximum allowed search distance. The number X is specified from the command line in the interpolation option. Then when these points have been found it calculates a weight for each point and applies this to the value of the data from the level1 file. The weight for point i is calculated as (distance^−2^) / (Sum (distance^−2^)) . This option is selected using {{{interpolation idw maxpoints}}} where maxpoints is the maximum number of points you want to use. 148 148 149 149 '''Bilinear''' … … 163 163 where f(x) is the data value of cell x. 164 164 165 Bilinear interpolation can be selected using interpolation bilinearon the command line.165 Bilinear interpolation can be selected using {{{interpolation bilinear}}} on the command line. 166 166 167 167 === Example aplmap commands ===