00001 /* ***************************************************** */ 00002 /* Mask region in a variable given latitude and */ 00003 /* longitude coordinates. */ 00004 /* mask_region_subdomain.c */ 00005 /* ***************************************************** */ 00006 /* Author: Christian Page, CERFACS, Toulouse, France. */ 00007 /* ***************************************************** */ 00012 /* LICENSE BEGIN 00013 00014 Copyright Cerfacs (Christian Page) (2015) 00015 00016 christian.page@cerfacs.fr 00017 00018 This software is a computer program whose purpose is to downscale climate 00019 scenarios using a statistical methodology based on weather regimes. 00020 00021 This software is governed by the CeCILL license under French law and 00022 abiding by the rules of distribution of free software. You can use, 00023 modify and/ or redistribute the software under the terms of the CeCILL 00024 license as circulated by CEA, CNRS and INRIA at the following URL 00025 "http://www.cecill.info". 00026 00027 As a counterpart to the access to the source code and rights to copy, 00028 modify and redistribute granted by the license, users are provided only 00029 with a limited warranty and the software's author, the holder of the 00030 economic rights, and the successive licensors have only limited 00031 liability. 00032 00033 In this respect, the user's attention is drawn to the risks associated 00034 with loading, using, modifying and/or developing or reproducing the 00035 software by the user in light of its specific status of free software, 00036 that may mean that it is complicated to manipulate, and that also 00037 therefore means that it is reserved for developers and experienced 00038 professionals having in-depth computer knowledge. Users are therefore 00039 encouraged to load and test the software's suitability as regards their 00040 requirements in conditions enabling the security of their systems and/or 00041 data to be ensured and, more generally, to use and operate it in the 00042 same conditions as regards security. 00043 00044 The fact that you are presently reading this means that you have had 00045 knowledge of the CeCILL license and that you accept its terms. 00046 00047 LICENSE END */ 00048 00049 00050 00051 00052 00053 00054 00055 #include <utils.h> 00056 00058 void 00059 mask_region(double *buffer, double missing_value, double *lon, double *lat, 00060 double minlon, double maxlon, double minlat, double maxlat, 00061 int nlon, int nlat, int ndim) { 00076 int i; /* Loop counter */ 00077 int j; /* Loop counter */ 00078 int t; /* Time loop counter */ 00079 double curlon; /* Current longitude */ 00080 double curlat; /* Current latitude */ 00081 00082 (void) printf("%s: Masking domain. Longitudes: %lf %lf. Latitudes: %lf %lf.\n", __FILE__, minlon, maxlon, minlat, maxlat); 00083 00084 /* Loop over all gridpoints */ 00085 00086 /* Loop over latitudes */ 00087 for (j=0; j<nlat; j++) { 00088 /* Loop over longitudes */ 00089 for (i=0; i<nlon; i++) { 00090 /* Adjust longitude to span -180 to +180 */ 00091 if (lon[i] > 180.0) 00092 curlon = lon[i] - 360.0; 00093 else 00094 curlon = lon[i+j*nlon]; 00095 curlat = lat[i+j*nlon]; 00096 /* Mask only gridpoints within bounds */ 00097 if (curlon >= minlon && curlon <= maxlon && curlat >= minlat && curlat <= maxlat) { 00098 /* Loop over last dimension to assign missing value for this gridpoint */ 00099 for (t=0; t<ndim; t++) 00100 buffer[i+j*nlon+t*nlon*nlat] = missing_value; 00101 } 00102 } 00103 } 00104 }