1 Sylvia Murphy National Center for Atmospheric Research File Handling with CMPS

2 Getting Started Utilities located on dataproc only. Put /contrib in your PATH Execute script in local directory or include full path

3 Extract variables from a GROUP of netCDF files Will process ALL *.nc files in the directory. Each file must have an UNLIMITED record dimension. Output file is esvc.nc usage: esvc.scp v1,v2,…,vN U V Concatenated File ESVC

4 Extract a single layer from variables in a netCDF file. Output file is topbot.nc Required modifiers: – name of the dimension to be indexed – array index to be extracted – variables to extract usage:topbot.scp dim inx v1,v2,…,vN filename 20 m Single Level Extraction

5 extract ALL 2D variables in a netCDF file. output file is filename_2d.nc usage: e2d.scp file.nc Extract 2D Variables

6 Extract a subregion from variables in a netCDF file. Several required modifiers: latmin and latmax lonmin and lonmax “-o” option indicates an oceanic file usage: subext.scp latmin latmax lonmin lonmax [-o] [-v v1,v2,…,vN] file Subregion Extraction

7 Calculates weighted horizontal average Can average over an oceanic basin or subregion Output file is filename_have.nc usage: have.scp [-m int] [-sr latmin,latmax,lonmin,lonmax] [-v v1,v2,…,vN] file Uses Gaussian weights (gw) Uses ocean area calculation Weighted Horizontal Average

8 Weighted volume average of variables in a netCDF file. Can average over oceanic basin or over a subregion Output file is filename_volave.nc usage: volave.scp [-m int] [-sr latmin,latmax,lonmin,lonmax] [-v v1,v2,…,vN] file Uses gw and delta pressure (dp) Uses ocean volume calculation Weighted Volume Average

9 Calculates zonal average of variables in a netCDF file. Output file is filename_zonal.nc Can average over an oceanic basin usage: zave.scp [-m int] [-v v1,v2,…,vN] file Zonal Average

10 Calculate difference between variables in two netCDF files Time dimension removed automatically from mean files “-m” option indicates an anomaly calculation Output file is cmps_anom.nc if one file is a mean file, otherwise it is cmps_diff.nc. usage: diff.scp [-m int] [-v v1,v2,…,vN] file1 file2 Difference/Anomalies

11 Calculate weighted RMSE variables in netCDF files. Output is rmse.nc Can be calculated over an ocean basin or subregion “-l” option calculates a volume RMSE for 3D variables. usage: rmse.scp [-m int] [-sr latmin,latmax,lonmin,lonmax] [-v v1,v2,…,vN] file Root Mean Squared Error

12 Multiply variables in the variable list by the set of constants and output results to a netCDF file At least one variable and corresponding factor must be provided. Can calculate over an oceanic basin usage: mult.scp -v v1,v2,v3 -f f1,f2,f3 [-m int] filename Multiplication

13 Adds variables in list and outputs results to netCDF file. Name of resultant calculation is required Can calculate over ocean basin. If LSM file, then all ocean points are excluded regardless of basin index listed. usage: add.scp -v v1,v2,…,vN -n name [-m int] filename Addition

14 Longitude Level Latitude 20  C Extracts iso surface of a given value from a netCDF file Output file is iso_filename.nc Variable and value to be extracted must be specified Works with variables that either increase or decrease with depth usage: iso.scp T 20 ocean_1.nc Isolevel Extraction

15 Extracts iso surface of a given value from a netCDF file Interpolates a second variable to that iso surface Output file is iso_interp_filename.nc Variable and value to be extracted plus variable to be interpolated must be specified usage: iso_interp.scp T CFC 20 ocean_1.nc Isolevel Interpolation Longitude Level Latitude CFC Longitude Level Latitude 20  C

16 Calculate the great circle path between two points, and interpolate model data to path. -p produces a plot in addition to file Output is filename_title.nc Number of points (npts) to interpolate is required usage: trans.scp leftlat,leftlon,rightlat,rightlon npts, title [-p] [-v v1,v2,…,vN] filename Transect

17 Extracts a time series from each point given. Output file is filename_tsext.nc -a option will output individual ascii files usage: tsext.scp latarray lonarray [-a] [-v v1,v2,…,vN] file Time Series Extraction Time

18 Weighted vertical average of variables in a NCOM netCDF file. Can average over oceanic basin or over a subregion Output file is filename_vertave.nc usage: vertave.scp [-m int] [-sr latmin,latmax,lonmin,lonmax] [-v v1,v2,…,vN] file Vertical Average NCOM Ocean files only

19 Resources Downloadable users manual: On-line version of this presentation: On-line home page: