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/*
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Copyright (c) 2010 Andy Kirkham
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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#include "GPS_Geodetic.h"
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void
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GPS_Geodetic::nmea_gga(char *s) {
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char *token;
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int token_counter = 0;
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char *latitude = (char *)NULL;
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char *longitude = (char *)NULL;
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char *lat_dir = (char *)NULL;
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char *lon_dir = (char *)NULL;
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char *qual = (char *)NULL;
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char *altitude = (char *)NULL;
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char *sats = (char *)NULL;
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token = strtok(s, ",");
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while (token) {
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switch (token_counter) {
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case 2: latitude = token; break;
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case 4: longitude = token; break;
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case 3: lat_dir = token; break;
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case 5: lon_dir = token; break;
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case 6: qual = token; break;
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case 7: sats = token; break;
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case 9: altitude = token; break;
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}
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token = strtok((char *)NULL, ",");
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token_counter++;
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}
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// If the fix quality is valid set our location information.
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if (latitude && longitude && altitude && sats) {
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lat = convert_lat_coord(latitude, lat_dir[0]);
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lon = convert_lon_coord(longitude, lon_dir[0]);
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alt = convert_height(altitude);
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num_of_gps_sats = atoi(sats);
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gps_satellite_quality = atoi(qual);
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}
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else {
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gps_satellite_quality = 0;
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}
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}
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double
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GPS_Geodetic::convert_lat_coord(char *s, char north_south)
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{
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int deg, min, sec;
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double fsec, val;
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deg = ( (s[0] - '0') * 10) + s[1] - '0';
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min = ( (s[2] - '0') * 10) + s[3] - '0';
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sec = ( ((s[5] - '0') * 1000) + ((s[6] - '0') * 100) + ((s[7] - '0') * 10) + (s[8] - '0'));
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fsec = (double)((double)sec /10000.0);
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val = (double)deg + ((double)((double)min/60.0)) + (fsec/60.0);
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if (north_south == 'S') { val *= -1.0; }
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lat = val;
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return val;
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}
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double
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GPS_Geodetic::convert_lon_coord(char *s, char east_west)
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{
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int deg, min, sec;
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double fsec, val;
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deg = ( (s[0] - '0') * 100) + ((s[1] - '0') * 10) + (s[2] - '0');
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min = ( (s[3] - '0') * 10) + s[4] - '0';
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sec = ( ((s[6] - '0') * 1000) + ((s[7] - '0') * 100) + ((s[8] - '0') * 10) + (s[9] - '0'));
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fsec = (double)((double)sec /10000.0);
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val = (double)deg + ((double)((double)min/60.0)) + (fsec/60.0);
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if (east_west == 'W') { val *= -1.0; }
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lon = val;
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return val;
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}
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double
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GPS_Geodetic::convert_height(char *s)
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{
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//double val = (double)(atof(s) / 1000.0);
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double val = (double)(atof(s) * 3.2808399);
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alt = val;
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return val;
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}
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Joost Tromp