Functions | |
| grib_iterator * | grib_iterator_new (grib_handle *h, unsigned long flags, int *error) |
| Create a new iterator from a handle, using current geometry and values. | |
| int | grib_iterator_next (grib_iterator *i, double *lat, double *lon, double *value) |
| Get the next value from an iterator. | |
| int | grib_iterator_previous (grib_iterator *i, double *lat, double *lon, double *value) |
| Get the previous value from an iterator. | |
| int | grib_iterator_has_next (grib_iterator *i) |
| Test procedure for values in an iterator. | |
| int | grib_iterator_reset (grib_iterator *i) |
| Test procedure for values in an iterator. | |
| int | grib_iterator_delete (grib_iterator *i) |
| Frees an iterator from memory. | |
| grib_nearest * | grib_nearest_new (grib_handle *h, int *error) |
| Create a new nearest from a handle, using current geometry . | |
| int | grib_nearest_find (grib_nearest *nearest, grib_handle *h, double inlat, double inlon, unsigned long flags, double *outlats, double *outlons, double *values, double *distances, int *indexes, size_t *len) |
| Find the 4 nearest points of a latitude longitude point. | |
| int | grib_nearest_delete (grib_nearest *nearest) |
| Frees an nearest from memory. | |
| int | grib_nearest_find_multiple (grib_handle *h, int is_lsm, double *inlats, double *inlons, long npoints, double *outlats, double *outlons, double *values, double *distances, int *indexes) |
| Find the nearest point of a set of points whose latitudes and longitudes are given in the inlats, inlons arrays respectively. | |
| int grib_iterator_delete | ( | grib_iterator * | i | ) |
Frees an iterator from memory.
| i | : the iterator |
| int grib_iterator_has_next | ( | grib_iterator * | i | ) |
Test procedure for values in an iterator.
| i | : the iterator |
| grib_iterator* grib_iterator_new | ( | grib_handle * | h, | |
| unsigned long | flags, | |||
| int * | error | |||
| ) |
Create a new iterator from a handle, using current geometry and values.
| h | : the handle from which the iterator will be created | |
| flags | : flags for future use. | |
| error | : error code |
| int grib_iterator_next | ( | grib_iterator * | i, | |
| double * | lat, | |||
| double * | lon, | |||
| double * | value | |||
| ) |
Get the next value from an iterator.
| i | : the iterator | |
| lat | : on output latitude in degree | |
| lon | : on output longitude in degree | |
| value | : on output value of the point |
| int grib_iterator_previous | ( | grib_iterator * | i, | |
| double * | lat, | |||
| double * | lon, | |||
| double * | value | |||
| ) |
Get the previous value from an iterator.
| i | : the iterator | |
| lat | : on output latitude in degree | |
| lon | : on output longitude in degree | |
| value | : on output value of the point* |
| int grib_iterator_reset | ( | grib_iterator * | i | ) |
Test procedure for values in an iterator.
| i | : the iterator |
| int grib_nearest_delete | ( | grib_nearest * | nearest | ) |
Frees an nearest from memory.
| nearest | : the nearest |
| int grib_nearest_find | ( | grib_nearest * | nearest, | |
| grib_handle * | h, | |||
| double | inlat, | |||
| double | inlon, | |||
| unsigned long | flags, | |||
| double * | outlats, | |||
| double * | outlons, | |||
| double * | values, | |||
| double * | distances, | |||
| int * | indexes, | |||
| size_t * | len | |||
| ) |
Find the 4 nearest points of a latitude longitude point.
The flags are provided to speed up the process of searching. If you are sure that the point you are asking for is not changing from a call to another you can use GRIB_NEAREST_SAME_POINT. The same is valid for the grid. Flags can be used together duing an or.
| nearest | : nearest structure | |
| h | : handle from which geography and data values are taken | |
| inlat | : latitude of the point to search for | |
| inlon | : longitude of the point to search for | |
| flags | : GRIB_NEAREST_SAME_POINT, GRIB_NEAREST_SAME_GRID | |
| outlats | : returned array of latitudes of the nearest points | |
| outlons | : returned array of longitudes of the nearest points | |
| values | : returned array of data values of the nearest points | |
| distances | : returned array of distances from the nearest points | |
| indexes | : returned array of indexes of the nearest points | |
| len | : size of the arrays |
| int grib_nearest_find_multiple | ( | grib_handle * | h, | |
| int | is_lsm, | |||
| double * | inlats, | |||
| double * | inlons, | |||
| long | npoints, | |||
| double * | outlats, | |||
| double * | outlons, | |||
| double * | values, | |||
| double * | distances, | |||
| int * | indexes | |||
| ) |
Find the nearest point of a set of points whose latitudes and longitudes are given in the inlats, inlons arrays respectively.
If the flag is_lsm is 1 the nearest land point is returned and the grib passed as handle (h) is considered a land sea mask. The land nearest point is the nearest point with land sea mask value>=0.5. If no nearest land points are found the nearest value is returned. If the flag is_lsm is 0 the nearest point is returned. values, distances, indexes (in the "values" array) for the nearest points (ilons,ilats) are returned.
| h | : handle from which geography and data values are taken | |
| is_lsm | : lsm flag (1-> nearest land, 0-> nearest) | |
| inlats | : latitudes of the points to search for | |
| inlons | : longitudes of the points to search for | |
| npoints | : number of points (size of the inlats,inlons,outlats,outlons,values,distances,indexes arrays) | |
| outlats | : returned array of latitudes of the nearest points | |
| outlons | : returned array of longitudes of the nearest points | |
| values | : returned array of data values of the nearest points | |
| distances | : returned array of distances from the nearest points | |
| indexes | : returned array of indexes of the nearest points |
| grib_nearest* grib_nearest_new | ( | grib_handle * | h, | |
| int * | error | |||
| ) |
Create a new nearest from a handle, using current geometry .
| h | : the handle from which the iterator will be created | |
| error | : error code |
1.5.3