mirror of https://github.com/ecmwf/eccodes.git
124 lines
4.2 KiB
C
124 lines
4.2 KiB
C
/*
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* (C) Copyright 2005- ECMWF.
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*
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* This software is licensed under the terms of the Apache Licence Version 2.0
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* which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
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*
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* In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
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* virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
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*/
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/*
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* C Implementation: bufr_read_synop
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*
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* Description: how to read SYNOP BUFR messages.
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*
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*/
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/*
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* Please note that SYNOP reports can be encoded in various ways in BUFR. Therefore the code
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* below might not work directly for other types of SYNOP messages than the one used in the
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* example. It is advised to use bufr_dump to understand the structure of the messages.
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*/
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#include "eccodes.h"
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int main(int argc, char* argv[])
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{
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FILE* in = NULL;
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/* message handle. Required in all the eccodes calls acting on a message.*/
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codes_handle* h = NULL;
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long longVal;
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double doubleVal;
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int err = 0;
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int cnt = 0;
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const char* infile = "../../data/bufr/syno_multi.bufr";
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in = fopen(infile, "rb");
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if (!in) {
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fprintf(stderr, "Error: unable to open file %s\n", infile);
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return 1;
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}
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/* loop over the messages in the BUFR file */
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while ((h = codes_handle_new_from_file(NULL, in, PRODUCT_BUFR, &err)) != NULL || err != CODES_SUCCESS) {
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if (h == NULL) {
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fprintf(stderr, "Error: unable to create handle for message %d\n", cnt);
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cnt++;
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continue;
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}
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printf("message: %d\n", cnt);
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/* we need to instruct ecCodes to unpack the data values */
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CODES_CHECK(codes_set_long(h, "unpack", 1), 0);
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/* station id*/
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CODES_CHECK(codes_get_long(h, "blockNumber", &longVal), 0);
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printf(" blockNumber: %ld\n", longVal);
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CODES_CHECK(codes_get_long(h, "stationNumber", &longVal), 0);
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printf(" stationNumber: %ld\n", longVal);
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/* location*/
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CODES_CHECK(codes_get_double(h, "latitude", &doubleVal), 0);
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printf(" latitude: %f\n", doubleVal);
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CODES_CHECK(codes_get_double(h, "longitude", &doubleVal), 0);
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printf(" longitude: %f\n", doubleVal);
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/* 2m temperature */
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CODES_CHECK(codes_get_double(h, "airTemperatureAt2M", &doubleVal), 0);
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printf(" airTemperatureAt2M: %f\n", doubleVal);
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/* 2m dewpoint temperature */
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CODES_CHECK(codes_get_double(h, "dewpointTemperatureAt2M", &doubleVal), 0);
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printf(" dewpointTemperatureAt2M: %f\n", doubleVal);
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/* 10 wind */
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CODES_CHECK(codes_get_double(h, "windSpeedAt10M", &doubleVal), 0);
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printf(" windSpeedAt10M: %f\n", doubleVal);
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CODES_CHECK(codes_get_double(h, "windDirectionAt10M", &doubleVal), 0);
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printf(" windDirectionAt10M: %f\n", doubleVal);
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/* The cloud information is stored in several blocks in the
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* SYNOP message and the same key means a different thing in different
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* parts of the message. In this example we will read the first
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* cloud block introduced by the key
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* verticalSignificanceSurfaceObservations=1.
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* We know that this is the first occurrence of the keys we want to
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* read so we will use the # (occurrence) operator accordingly. */
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/* Cloud amount (low and middleclouds) */
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CODES_CHECK(codes_get_long(h, "#1#cloudAmount", &longVal), 0);
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printf(" cloudAmount (low and middle): %ld\n", longVal);
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/* Height of cloud base */
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CODES_CHECK(codes_get_long(h, "#1#heightOfBaseOfCloud", &longVal), 0);
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printf(" heightOfBaseOfCloud: %ld\n", longVal);
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/* Cloud type (low clouds) */
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CODES_CHECK(codes_get_long(h, "#1#cloudType", &longVal), 0);
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printf(" cloudType (low): %ld\n", longVal);
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/* Cloud type (middle clouds) */
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CODES_CHECK(codes_get_long(h, "#2#cloudType", &longVal), 0);
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printf(" cloudType (middle): %ld\n", longVal);
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/* Cloud type (high clouds) */
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CODES_CHECK(codes_get_long(h, "#3#cloudType", &longVal), 0);
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printf(" cloudType (high): %ld\n", longVal);
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/* delete handle */
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codes_handle_delete(h);
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cnt++;
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}
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fclose(in);
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return 0;
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}
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