Changes between Version 4 and Version 5 of Processing/AplUserGuide


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Timestamp:
Feb 7, 2012 11:53:22 AM (8 years ago)
Author:
mark1
Comment:

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  • Processing/AplUserGuide

    v4 v5  
    141141'''Nearest Neighbour'''
    142142
    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 level-1 file is then used for this pixel. This option is selected using -interpolation nearest on the command line.
     143Mapping 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 level-1 file is then used for this pixel. This option is selected using {{{-interpolation nearest}}} on the command line.
    144144
    145145'''Inverse Distance Weighted'''
    146146
    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 level-1 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.
     147The 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 level-1 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.
    148148
    149149'''Bilinear'''
     
    163163where f(x) is the data value of cell x.
    164164
    165 Bilinear interpolation can be selected using -interpolation bilinear on the command line.
     165Bilinear interpolation can be selected using {{{-interpolation bilinear}}} on the command line.
    166166
    167167=== Example aplmap commands ===