Changes between Version 3 and Version 4 of ToolsAndUtilities/PpFileTools


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Timestamp:
30/04/13 12:55:09 (6 years ago)
Author:
ros
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  • ToolsAndUtilities/PpFileTools

    v3 v4  
    4444This compares two PP files of the same size. It computes the relative difference between corresponding field points according to the formula 
    4545 
    46 Image 
     46[[Image(rel_diff_equn.gif)]] 
    4747 
    4848Usage: 
     
    5050pp_rdiff {Input PP file 1} {Input PP file 2} [{Threshold}] 
    5151}}} 
    52 where `Threshold` is a positive number. If no threshold is supplied, a value of 10-7 is used. The tool reports whether the files are different to within threshold and the maximum absolute relative difference found. 
     52where `Threshold` is a positive number. If no threshold is supplied, a value of 10^-7^ is used. The tool reports whether the files are different to within threshold and the maximum absolute relative difference found. 
    5353 
    5454== pp_qdiff == 
     
    7272}}} 
    7373where the STASH items are separated by spaces. 
     74 
     75== Other PP tools == 
     76 
     77 * Extract PP fileds from a large file: extract_timesteps.f90.gz \\ 
     78 This code can be used to extract some data from a larger pp data file. It is designed for interactive use, inputs to the code being taken from the screen. The required stash codes are specified, and data for these codes is extracted for a range of times. 
     79 
     80 * Code to determine time and spatial averages of UM diagnostics: diag_avg.tar.gz \\ 
     81 This code can be used to take averages of UM diagnostics. The data is input as a pp file, such as might be produced from the output of MDIAG. Average values of a diagnostic can be calculated as a time mean, a running mean and as a spatial average (which may be averaged over a limited domain) 
     82 
     83 * Code to determine the max/min of UM diagnostics: diag_maxmin.tar.gz \\ 
     84 This code can be used to find maxima and minima of UM diagnostics. The data is input as a pp file, such as might be produced from the output of MDIAG. Extreme values of a diagnostic are produced for a specified vertical level. The horizontal domain may be restricted if desired. 
     85 
     86 * Code to interpolate from model to pressure levels: pvtrace.tar.gz \\ 
     87 The MDIAG code is very useful for calculating pressure-level diagnostics from a set of UM output fields on model levels. However, suppose that you already have your diagnostic of interest but just want to interpolate it from model to pressure levels. This code will do just that. It can also be used to construct linear combinations of existing fields, and to output them on either model levels or pressure levels. 
     88 
     89For advanced users, further details of the PP format can be found in UM Documentation Paper F3.