NASA Ocean Color

ocssw V2022

  
 #include "l12_proto.h"
 #include "nc_gridutils.h"
  
 #define TILE_ROWS 120
  
 #define MAXSENZEN 75
  
 #define BORDER 0.30
  
 #define REMM 6371000.000
  
 // only init the dem file once
 static int firstCall = 1;
  
 /* global variables */
 static grid_info_t* dem_grid = {0};
 static const char* demNames[] ={"height", "z", "depth", "elevation", "altitude", NULL};
 static grid_info_t* surfGrid = {0};
 static const char* surfNames[] = {"water_surface_height", NULL};
  
 typedef struct {
     int number;
     double NSEW[4]; 
     size_t numLat;
     double startLat;
     double endLat;
     double deltaLat;
     size_t numLon;
     double startLon;
     double endLon;
     double deltaLon;
     double minval;
     double maxval;
     double *height; 
 } tile_struct;
  
 static struct {
     size_t ntiles;
     size_t ncols[TILE_ROWS];
     size_t start_tile[TILE_ROWS];
     tile_struct *tiles;
 } dem;
  
 void print_area(grid_area_t area) {
     fprintf(stdout, "\tnumLat   = %d\n", (int) area.numLat);
     fprintf(stdout, "\tstartLat = %8.3f\n", area.startLat);
     fprintf(stdout, "\tendLat   = %8.3f\n", area.endLat);
     fprintf(stdout, "\tnumLon   = %d\n", (int) area.numLon);
     fprintf(stdout, "\tstartLon = %8.3f\n", area.startLon);
     fprintf(stdout, "\tendLon   = %8.3f\n", area.endLon);
 }
  
 void print_tile(tile_struct tile) {
     fprintf(stdout, "tile # %d\n", tile.number);
     fprintf(stdout, "\tstartLat = %8.3f\n", tile.startLat);
     fprintf(stdout, "\tSouth    = %8.3f\n", tile.NSEW[1]);
     fprintf(stdout, "\tNorth    = %8.3f\n", tile.NSEW[0]);
     fprintf(stdout, "\tendLat   = %8.3f\n", tile.endLat);
     fprintf(stdout, "\tnumLat   = %d\n", (int) tile.numLat);
     fprintf(stdout, "\tdeltaLat = %f\n", tile.deltaLat);
     fprintf(stdout, "\tstartLon = %8.3f\n", tile.startLon);
     fprintf(stdout, "\tWest     = %8.3f\n", tile.NSEW[3]);
     fprintf(stdout, "\tEast     = %8.3f\n", tile.NSEW[2]);
     fprintf(stdout, "\tendLon   = %8.3f\n", tile.endLon);
     fprintf(stdout, "\tnumLon   = %d\n", (int) tile.numLon);
     fprintf(stdout, "\tdeltaLon = %f\n", tile.deltaLon);
     fprintf(stdout, "\tvalue (%p) range = {%d,%d}\n",
             tile.height, (int) tile.minval, (int) tile.maxval);
 }
  
 void define_tile_geometry() {
     int itile = 0;
     int irow, nrows = TILE_ROWS;
     int icol, ncols, maxcols;
     double lonborder, latborder = BORDER;
     double minlat, maxlat, dlat;
     double minlon, maxlon, dlon;
     double latfrac;
  
     dlat = 180.0 / nrows; // latitude height for each row
     maxcols = 2 * nrows; // number of columns at equator
  
     /* Calculate number of columns in each row */
     for (irow = 0; irow < nrows; irow++) {
  
         // first tile in this row
         dem.start_tile[irow] = itile;
  
         // number of columns varies with latitude
         latfrac = (double) irow / (nrows - 1);
         ncols = (int) round(maxcols * sin(PI * latfrac));
         if (ncols == 0) ncols = 1;
         dem.ncols[irow] = ncols;
  
         // running total number of tiles
         itile += ncols;
     }
     // now itile holds total number of tiles.
     dem.ntiles = itile;
  
     /* Allocate space for tile array */
     dem.tiles = (tile_struct *) malloc(itile * sizeof (tile_struct));
     if (dem.tiles == NULL) {
         fprintf(stderr,
                 "-E- %s:%d: Could not allocate memory for %d tiles\n",
                 __FILE__, __LINE__, itile);
         exit(1);
     }
  
     /* Calculate extent of each tile */
  
     /* for each row */
     for (irow = 0; irow < nrows; irow++) {
  
         // nominal edge latitudes for this row
         minlat = dlat * irow - 90.0;
         maxlat = minlat + dlat;
  
         // adjust for border
         minlat -= latborder;
         if (minlat < -90.0) minlat = -90.0;
         maxlat += latborder;
         if (maxlat > 90.0) maxlat = 90.0;
  
         // longitude width for each column of this row
         ncols = dem.ncols[irow];
         dlon = 360.0 / ncols;
  
         // calculate longitude border for this row
         if (ncols == 1) lonborder = 0; // unless at poles
         else if (minlat < 0)
             lonborder = latborder / cos(minlat / RADEG);
         else lonborder = latborder / cos(maxlat / RADEG);
  
         /* for each column */
         for (icol = 0; icol < ncols; icol++) {
  
             // nominal edge longitudes for this column
             minlon = dlon * icol - 180.0;
             maxlon = minlon + dlon;
  
             // adjust for border
             minlon -= lonborder;
             maxlon += lonborder;
  
             // store results
             itile = dem.start_tile[irow] + icol;
             dem.tiles[itile].NSEW[0] = maxlat;
             dem.tiles[itile].NSEW[1] = minlat;
             dem.tiles[itile].NSEW[2] = maxlon;
             dem.tiles[itile].NSEW[3] = minlon;
             dem.tiles[itile].number = -1; // flag for tile loaded
             dem.tiles[itile].height = NULL; // also init values to null
  
         } // icol
     } // irow
 }
  
 int initialize_deminfo() {
     int status;
     dem.ntiles = 0;
  
     /* allocate and load primary elevation info */
     dem_grid = allocate_gridinfo();
     status = init_gridinfo(input->demfile, demNames, dem_grid);
     if (status != NC_NOERR) {
         free(dem_grid);
         dem_grid = NULL;
         fprintf(stderr, "-E- %s line %d: "
                 "Unable to initialize grid for digital elevation \"%s\".\n",
                 __FILE__, __LINE__, input->demfile);
         return status;
     }
  
     /* allocate and load secondary elevation info */
     surfGrid = allocate_gridinfo();
     status = init_gridinfo(input->demfile, surfNames, surfGrid);
     if (status != NC_NOERR) {
         free(surfGrid);
         surfGrid = NULL;
         fprintf(stderr, "-W- %s line %d: "
                 "Could not read secondary grid info from \"%s\"; continuing.\n",
                 __FILE__, __LINE__, input->demfile);
         status = NC_NOERR;
     }
  
     /* Initialize tile geometry */
     define_tile_geometry();
  
     return status;
 }
  
 void free_deminfo() {
     int i;
     if (dem_grid != NULL) {
  
         /* free space allocated for tile values */
         for (i = 0; i < dem.ntiles; i++)
             if (dem.tiles[i].height != NULL) {
                 free(dem.tiles[i].height);
                 dem.tiles[i].height = NULL;
             }
  
         /* free space allocated for tile array */
         free(dem.tiles);
         dem.tiles = NULL;
  
         /* free surfGrid and dem_grid */
         if (surfGrid != NULL) {
             free(surfGrid);
             surfGrid = NULL;
         }
         free(dem_grid);
         dem_grid = NULL;
     } 
 }
  
 void unload_tile(int itile) {
     tile_struct *tile;
     
     tile = &dem.tiles[itile];
     free(tile->height);
     tile->height = NULL;
     tile->number = -1;
 }
  
 void load_tile_cache(int itile) {
     const int list_size = 30;
     static int tile_list[30];
     static int num_in_list = 0;
  
     //printf("***** load tile = %d\n", itile);
  
     tile_list[num_in_list++] = itile;
     if(num_in_list == list_size) {
         unload_tile(tile_list[0]);
         num_in_list--;
         for(int i=0; i<num_in_list; i++) {
             tile_list[i] = tile_list[i+1];
         }
     }
 }
  
 int load_tile(float lat, float lon) {
     int status;
     double dlat, dlon;
     int irow, icol, itile;
     tile_struct *tile;
     grid_area_t elevArea = {0};
     grid_area_t surfArea = {0};
     int i, nvalues;
     double minlat, minlon, maxlon;
     double minval, maxval;
  
     /* enforce valid coordinate range */
     status = fix_latlon(&lat, &lon);
     if (status) return -1;
  
     /* get tile number for this lat, lon */
     dlat = 180.0 / TILE_ROWS; // latitude height for each row
     irow = (int) floor((lat + 90.) / dlat); // row number
     // make sure we don't run off the end
     if (irow == TILE_ROWS)
         irow -= 1;
     dlon = 360.0 / dem.ncols[irow]; // longitude width for this row
     if (lon == 180.0)
         icol = 0;
     else
         icol = (int) floor((lon + 180.) / dlon); // column number
  
     if (icol > dem.ncols[irow] - 1) {
         fprintf(stderr, "\nERROR in load_tile():\n");
         fprintf(stderr, "\ticol = %d ncols = %d\n",
                 icol, (int) dem.ncols[irow]);
         return -1;
     }
     itile = dem.start_tile[irow] + icol; // tile number
     tile = &dem.tiles[itile];
  
     /* load only if not already in memory */
     if (tile->number != itile) {
  
         load_tile_cache(itile);
  
         // read values for tile area
         status = get_grid_area(dem_grid,
                 tile->NSEW[0], tile->NSEW[1],
                 tile->NSEW[2], tile->NSEW[3],
                 &elevArea);
         if (status) return -1;
  
         if (surfGrid != NULL) {
             status = get_grid_area(surfGrid,
                     tile->NSEW[0], tile->NSEW[1],
                     tile->NSEW[2], tile->NSEW[3],
                     &surfArea);
             if (status) return -1;
         }
  
         // adjust boundaries as needed
         minlat = elevArea.startLat;
         minlon = elevArea.startLon;
         maxlon = elevArea.endLon;
         if (maxlon < tile->NSEW[2]) minlon += 360.0;
         if (minlon > tile->NSEW[3]) minlon -= 360.0;
  
         // fill tile structure
         tile->number = itile;
         tile->height = elevArea.values;
  
         tile->numLat = elevArea.numLat;
         tile->startLat = minlat;
         tile->deltaLat = elevArea.grid->deltaLat;
         tile->endLat = tile->startLat + tile->numLat * tile->deltaLat;
  
         tile->numLon = elevArea.numLon;
         tile->startLon = minlon;
         tile->deltaLon = elevArea.grid->deltaLon;
         tile->endLon = tile->startLon + tile->numLon * tile->deltaLon;
  
         // step through extracted area(s)
         nvalues = tile->numLat * tile->numLon;
         minval = fabs(dem_grid->FillValue);
         maxval = -1 * minval;
         for (i = 0; i < nvalues; i++) {
  
             // substitute values as appropriate
             if ((surfGrid != NULL) &&
                     (fabs(surfArea.values[i] - surfGrid->FillValue) > DBL_EPSILON))
                 tile->height[i] = surfArea.values[i];
  
             // find range
             if (tile->height[i] < minval) minval = tile->height[i];
             if (tile->height[i] > maxval) maxval = tile->height[i];
         }
         tile->minval = minval;
         tile->maxval = maxval;
         free(surfArea.values);
     }
  
     status = ((tile->startLat > lat) || (lat > tile->endLat) ||
             (tile->startLon > lon)); //|| (lon > tile->endLon));
     if (status) {
         fprintf(stderr, "\nERROR in load_tile():\n");
         fprintf(stderr, "lat=%7.3f  lon=%8.3f\n", lat, lon);
         fprintf(stderr, "dlat=%f irow=%d dlon=%f icol=%d itile=%d\n",
                 dlat, irow, dlon, icol, itile);
         fprintf(stderr, "lat diffs: %f %f\n", lat - tile->startLat, tile->endLat - lat);
         fprintf(stderr, "lon diffs: %f %f\n", lon - tile->startLon, tile->endLon - lon);
         fprintf(stderr, "elevArea:\n");
         print_area(elevArea);
         print_tile(*tile);
         fprintf(stderr, "\n");
         //exit(1);
     }
  
     return itile;
 }
  
 int tile_findex(tile_struct tile, float lat, float lon, double *findex) {
     int status;
     double normLat, normLon;
  
     /* enforce valid coordinate range */
     findex[0] = findex[1] = -999.0;
     status = fix_latlon(&lat, &lon);
     if (status) return status; // flag NaN inputs
  
     /* calculate array index from normalized lat/lon */
     normLat = lat - tile.startLat;
     normLon = lon - tile.startLon;
     if (normLon < 0.0) normLon += 360.0; // adjust for dateline
     if (normLon > 360.0) normLon -= 360.0; // crossing
     findex[0] = normLat / tile.deltaLat;
     findex[1] = normLon / tile.deltaLon;
  
     /* cap latitude at North pole */
     if ((findex[0] >= tile.numLat) &&
             ((tile.endLat + FLT_EPSILON) > 90.0))
         findex[0] = (float) tile.numLat - FLT_EPSILON;
  
     /* longitudes wrap for global tile only */
     if ((findex[1] >= tile.numLon) &&
             ((tile.endLon - tile.startLon + FLT_EPSILON) > 360.0))
         findex[1] -= tile.numLon;
  
     /* make sure final index is inside current tile */
     status = ((0 > findex[0]) || (findex[0] >= tile.numLat) ||
             (0 > findex[1]) || (findex[1] >= tile.numLon));
     if (status) {
         fprintf(stderr, "-E- %s:%d: tile_findex():\n",
                 __FILE__, __LINE__);
         fprintf(stderr, "input    lat = %7.3f   lon = %8.3f\n", lat, lon);
         fprintf(stderr, "norm     lat = %7.3f   lon = %8.3f\n", normLat, normLon);
         fprintf(stderr, "output  flat = %7.3f  flon = %8.3f\n",
                 findex[0], findex[1]);
         fprintf(stderr, "      numLat = %7d   Lon = %8d\n",
                 (int) tile.numLat, (int) tile.numLon);
         print_tile(tile);
         fprintf(stderr, "\n");
     }
     return status;
 }
  
 int tile_index(tile_struct tile, float lat, float lon, size_t *index) {
     int status;
     double findex[2];
  
     /* calculate float array index */
     status = tile_findex(tile, lat, lon, findex);
  
     /* make sure max value gives valid index */
     if (findex[0] > tile.numLat - 1) findex[0] -= FLT_EPSILON;
     if (findex[1] > tile.numLon - 1) findex[1] -= FLT_EPSILON;
  
     /* truncate to integer */
     index[0] = (int) findex[0];
     index[1] = (int) findex[1];
  
     return status; // inherited from tile_findex
 }
  
 int get_tilevalue(tile_struct tile, float lat, float lon, double *value) {
     int status = 1;
     size_t index[2];
     if (tile.height != NULL) {
         status = tile_index(tile, lat, lon, index);
         if (!status)
             *value = tile.height[index[0] * tile.numLon + index[1]];
     }
     return status;
 }
  
 int interp_tilevalue(tile_struct tile, float lat, float lon, double *result) {
     int status = 1;
     size_t index[2];
     double findex[2];
     size_t x0, x1, y0, y1;
     size_t nx;
     double x, y;
  
     if (tile.height == NULL) return 1;
  
     /* find integer array index for current point */
     status = tile_index(tile, lat, lon, index);
     if (status) return status;
  
     /* find adjacent points */
     y0 = index[0];
     y1 = y0 + 1;
     x0 = index[1];
     x1 = x0 + 1;
  
     /* cap latitude at North pole */
     if (y1 == tile.numLat)
         y1 = tile.numLat - 1;
  
     /* longitudes wrap for global tile only */
     if ((x1 == tile.numLon) &&
             ((tile.endLon - tile.startLon + FLT_EPSILON) > 360.0))
         x1 = 0;
  
     /* make sure all four points within tile bounds */
     status = ((y1 > tile.numLat - 1) || (x1 > tile.numLon - 1));
     if (status) {
         tile_findex(tile, lat, lon, findex);
         fprintf(stderr, "-E- %s:%d: interp_tilevalue():\n",
                 __FILE__, __LINE__);
         fprintf(stderr, "   lat = %7.3f   lon = %8.3f\n", lat, lon);
         fprintf(stderr, "  flat = %7.3f  flon = %8.3f\n",
                 findex[0], findex[1]);
         fprintf(stderr, "  ilat = %7d  ilon = %8d\n", (int) y0, (int) x0);
         fprintf(stderr, "numLat = %7d   Lon = %8d\n",
                 (int) tile.numLat, (int) tile.numLon);
         print_tile(tile);
         fprintf(stderr, "\n");
         return status;
     }
  
     /* find float array index */
     /* shift to unit coordinate system */
     tile_findex(tile, lat, lon, findex);
     y = findex[0] - index[0];
     x = findex[1] - index[1];
  
     /* calculate interpolated value */
     nx = tile.numLon;
     *result
             = tile.height[y0 * nx + x0] * (1 - x)*(1 - y) // x=0, y=0
             + tile.height[y0 * nx + x1] * x * (1 - y) // x=1, y=0
             + tile.height[y1 * nx + x0] * (1 - x) * y // x=0, y=1
             + tile.height[y1 * nx + x1] * x * y; // x=1, y=1
  
     return status;
 }
  
 int get_nc_height(float *xlon, float *xlat,
         float *senz, float *sena,
         float *height) {
     int status;
     static double ddist;
     double step = 0.5;
     double tszmin = 0.01;
     double tansnz, sinsna, cossna, coslat;
     double lat, lon, dlat, dlon;
     double dd, dist;
     double dem_hgt, dem_old, los_hgt, los_old;
     int stepnum, maxsteps;
     int itile;
     tile_struct tile;
  
     if (firstCall) {
         /* Initialize DEM info */
         if (initialize_deminfo()) return 1;
         firstCall = 0;
     }
  
     /* Set step size in meters */
     if(ddist == 0.0)
         ddist = step * REMM * 180.0 / (dem_grid->numLat * RADEG);
  
     /* Skip if close to limb */
     if (*senz > MAXSENZEN) {
         return 0;
     }
  
     /* Load tile for this lat,lon */
     itile = load_tile(*xlat, *xlon);
     if ((itile < 0) || (itile > dem.ntiles - 1)) {
             fprintf(stderr, "\nERROR from load_tile():");
             fprintf(stderr, "\txlat=%8.3f  xlon=%8.3f  itile=%d\n",
                     *xlat, *xlon, itile);
             return 1;
         }
     tile = dem.tiles[itile];
  
     /* Default for sea-level tile */
     if (((int) tile.minval == 0) &&
             ((int) tile.maxval == 0)) {
         *height = 0.0f;
         return 0;
     }
  
     /* Pre-compute trig functions */
     tansnz = tan(*senz / RADEG);
     sinsna = sin(*sena / RADEG);
     cossna = cos(*sena / RADEG);
     coslat = cos(*xlat / RADEG);
     dlat = cossna * RADEG / REMM;
     dlon = sinsna * RADEG / (REMM * coslat);
  
     /* If flat tile */
     if ((tile.maxval - tile.minval) < 1.0) {
         *height = (float) tile.maxval;
         dist = *height * tansnz * REMM / (REMM + *height);
     }
         /* Check for sensor zenith close to zero */
     else if (tansnz < tszmin) {
         status = interp_tilevalue(tile, *xlat, *xlon, &dem_hgt);
         *height = (float) dem_hgt;
         dist = *height * tansnz;
     }
         /* Else step downward along line-of-sight */
     else {
  
         /* Determine maximum number of steps above ellipsoid */
         maxsteps = tile.maxval * tansnz / ddist + 2;
  
         /* Initialize search parameters */
         dem_hgt = 0.0;
         los_hgt = 0.0;
         stepnum = maxsteps;
  
         /* Step downward along line-of-sight until terrain intersection */
         do {
             los_old = los_hgt;
             dem_old = dem_hgt;
             dist = stepnum * ddist;
  
             /* Interpolated height from DEM */
             lat = *xlat + dist * dlat;
             lon = *xlon + dist * dlon;
             status = interp_tilevalue(tile, lat, lon, &dem_hgt);
             if (status) {
                 fprintf(stderr, "-E- %s:%d: get_nc_height():\n",
                         __FILE__, __LINE__);
                 fprintf(stderr, "\titer = %6d\n", maxsteps - stepnum);
                 return status;
             }
  
             /* LOS height with correction for Earth curvature effect */
             los_hgt = dist
                     * (dist * tansnz / 2.0 + REMM)
                     / (REMM * tansnz - dist);
             stepnum--;
         } while (los_hgt > dem_hgt);
  
         /* Interpolate to find final distance along line of sight */
         dd = (dem_hgt - los_hgt) / (dem_hgt - los_hgt + los_old - dem_old);
         dist += dd * ddist;
     }
  
     /* Compute adjustments to lon, lat, solar zenith and azimuth */
     /* (need to look at corrections for polar regions) */
     *xlat += (float) dist * dlat;
     *xlon += (float) dist * dlon;
     *senz -= (float) dist * RADEG / REMM;
     status = interp_tilevalue(tile, *xlat, *xlon, &dem_hgt);
     *height = (float) dem_hgt;
  
     /* Check for longitude transition over date line */
     if (*xlon > 180.f) {
         *xlon -= 360.f;
     }
     if (*xlon < -180.f) {
         *xlon += 360.f;
     }
  
     return status;
 }
  
 int lookup_nc_height(float *xlon, float *xlat, float *height) {
     int status;
     double dem_hgt;
     int itile;
     tile_struct tile;
     if (firstCall) {
         /* Initialize DEM info */
         if (initialize_deminfo()) return 1;
         firstCall = 0;
     }
     /* Load tile for this lat,lon */
     itile = load_tile(*xlat, *xlon);
     if ((itile < 0) || (itile > dem.ntiles - 1)) {
         fprintf(stderr, "\nERROR from load_tile():");
         fprintf(stderr, "\txlat=%8.3f  xlon=%8.3f  itile=%d\n",
                 *xlat, *xlon, itile);
         return 1;
     }
     tile = dem.tiles[itile];
     status = get_tilevalue(tile, *xlat, *xlon, &dem_hgt);
     *height = (float) dem_hgt;
     return status;
 }
  
 int interp_nc_height(float *xlon, float *xlat, float *height) {
     int status;
     double dem_hgt;
     int itile;
     tile_struct tile;
     if (firstCall) {
         /* Initialize DEM info */
         if (initialize_deminfo()) return 1;
         firstCall = 0;
     }
     /* Load tile for this lat,lon */
     itile = load_tile(*xlat, *xlon);
     if ((itile < 0) || (itile > dem.ntiles - 1)) {
         fprintf(stderr, "\nERROR from load_tile():");
         fprintf(stderr, "\txlat=%8.3f  xlon=%8.3f  itile=%d\n",
                 *xlat, *xlon, itile);
         return 1;
     }
     tile = dem.tiles[itile];
     status = interp_tilevalue(tile, *xlat, *xlon, &dem_hgt);
     *height = (float) dem_hgt;
     return status;
 }

tile_struct::height

double * height

Definition: get_nc_height.c:46

tile_struct::startLat

double startLat

Definition: get_nc_height.c:37

l1mapgen.stderr

stderr

Definition: l1mapgen.py:204

index

an array had not been initialized Several spelling and grammar corrections were which is read from the appropriate MCF the above metadata values were hard coded A problem calculating the average background DN for SWIR bands when the moon is in the space view port was corrected The new algorithm used to calculate the average background DN for all reflective bands when the moon is in the space view port is now the same as the algorithm employed by the thermal bands For non SWIR changes in the averages are typically less than Also for non SWIR the black body DNs remain a backup in case the SV DNs are not available For SWIR the changes in computed averages were larger because the old which used the black body suffered from contamination by the micron leak As a consequence of the if SV DNs are not available for the SWIR the EV pixels will not be the granule time is used to identify the appropriate tables within the set given for one LUT the first two or last two tables respectively will be used for the interpolation If there is only one LUT in the set of it will be treated as a constant LUT The manner in which Earth View data is checked for saturation was changed Previously the raw Earth View DNs and Space View DNs were checked against the lookup table values contained in the table dn_sat The change made is to check the raw Earth and Space View DNs to be sure they are less than the maximum saturation value and to check the Space View subtracted Earth View dns against a set of values contained in the new lookup table dn_sat_ev The metadata configuration and ASSOCIATEDINSTRUMENTSHORTNAME from the MOD02HKM product The same metatdata with extensions and were removed from the MOD021KM and MOD02OBC products ASSOCIATEDSENSORSHORTNAME was set to MODIS in all products These changes are reflected in new File Specification which users may consult for exact the pow functions were eliminated in Emissive_Cal and Emissive bands replaced by more efficient code Other calculations throughout the code were also made more efficient Aside from a few round off there was no difference to the product The CPU time decreased by about for a day case and for a night case A minor bug in calculating the uncertainty index for emissive bands was corrected The frame index(0-based) was previously being used the frame number(1-based) should have been used. There were only a few minor changes to the uncertainty index(maximum of 1 digit). 3. Some inefficient arrays(Sigma_RVS_norm_sq) were eliminated and some code lines in Preprocess_L1A_Data were moved into Process_OBCEng_Emiss. There were no changes to the product. Required RAM was reduced by 20 MB. Now

value

int32 value

Definition: Granule.c:1235

grid_area_t::endLon

double endLon

Definition: nc_gridutils.h:58

fix_latlon

int fix_latlon(float *lat, float *lon)

Definition: nc_gridutils.c:281

MDN.parameters.float

float

Definition: parameters.py:23