1. Introduction
Gridded SuperDARN data consists of median filtered, geo-magnetically located ionospheric scatter, fitted to an equi-area grid. Listed below is the C data structure struct GridData used to store the gridded data.
2. struct GridData
The gridded data structure is defined in the header superdarn/griddata.h.
struct GridData {
double st_time; /* record start time */
double ed_time; /* record end time */
int stnum; /* number of stations */
int vcnum;
unsigned char xtd; /* extended data flag */
struct GridSVec *sdata; /* station data */
struct GridGVec *data; /* vector data */
};
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3. struct GridSVec
struct GridSVec {
int st_id; /* station identifier */
int chn; /* channel number */
int npnt; /* number of vectors from this station */
double freq0; /* operating frequency */
char major_revision; /* algorithm major revision */
char minor_revision; /* algorithm minor revision */
int prog_id; /* program identifier */
char gsct; /* ground scatter componenet */
struct {
double mean; /* mean noise */
double sd; /* noise standard deviation */
} noise;
struct {
double min; /* velocity minimum threshold */
double max; /* velocity maximum threshold */
} vel;
struct {
double min; /* power minimum threshold */
double max; /* power maximum threshold */
} pwr;
struct {
double min; /* spectral width minimum threshold */
double max; /* spectral width maximum threshold */
} wdt;
struct {
double min; /* velocity error minimum threshold */
double max; /* velocity error maximum threshold */
} verr;
};
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4. struct GridGVec
struct GridGVec {
double mlatl /* magnetic latittude */
double mlon; /* magnetic longitude */
double azm; /* magnetic azimuth */
struct {
double median; /* velocity median */
double sd; /* velocity standard deviation */
} vel;
struct {
double median; /* power median */
double sd; /* power standard deviation */
} pwr;
struct {
double median; /* spectral width median */
double sd; /* spectral width standard deviation */
} wdt;
int st_id; /* station identifier */
int chn; /* channel number */
int index; /* grid index */
};
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