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FUNCTION read_modis_cloud_mask, filename sd_names = 'Cloud_Mask' sd_names_lat = 'Latitude' sd_names_lon = 'Longitude' sd_id = HDF_SD_START(filename, /READ) sds_index_cm = HDF_SD_NAMETOINDEX(sd_id, sd_names) sds_index_lat = HDF_SD_NAMETOINDEX(sd_id, sd_names_lat) sds_index_lon = HDF_SD_NAMETOINDEX(sd_id, sd_names_lon) sds_id_cm = HDF_SD_SELECT(sd_id, sds_index_cm) sds_id_lat = HDF_SD_SELECT(sd_id, sds_index_lat) sds_id_lon = HDF_SD_SELECT(sd_id, sds_index_lon) ;Get information of hdffile. HDF_SD_GETINFO, sds_id_cm, NAME = name, DIMS = dims, TYPE = data_type ;Read byte 1. count = [dims[0], dims[1], 1] HDF_SD_GETDATA, sds_id_cm, data_cm, COUNT = count data_cm_size = SIZE(data_cm, /DIMENSIONS) ;Read latitude HDF_SD_GETDATA, sds_id_lat, data_lat data_lat = CONGRID(data_lat, data_cm_size[0], data_cm_size[1], /INTERP) ;Read longitude HDF_SD_GETDATA, sds_id_lon, data_lon data_lon = CONGRID(data_lon, data_cm_size[0], data_cm_size[1], /INTERP) HDF_SD_ENDACCESS, sds_id_cm HDF_SD_ENDACCESS, sds_id_lat HDF_SD_ENDACCESS, sds_id_lon HDF_SD_END, sd_id ;BIT 1,2 - unobstructed FOV quality flag ; 0 - Cloud ; 1 - 66% probality of clear ; 2 - 95% probality of clear ; 3 - 99% probality of clear bit1 = bit_get(data_cm, 1) bit2 = bit_get(data_cm, 2) clear99_prob_idx = WHERE(bit2 AND bit1) clear95_prob_idx = WHERE(bit2 AND (~ bit1)) clear66_prob_idx = WHERE((~ bit2) AND bit1) cloud_idx = WHERE((~ bit2) AND (~ bit1)) mask = BYTARR(dims[0], dims[1]) mask[clear99_prob_idx] = 3 mask[clear95_prob_idx] = 2 mask[clear66_prob_idx] = 1 mask[cloud_idx] = 0 data = {mask : mask, lat : data_lat, lon : data_lon} RETURN, data END ³ÌÐòÔËÐв»ÁË£¬²»¶®ÎªÊ²Ã´£¬ÓÐûÓж®IDL±à³ÌµÄÅóÓѰïæ½â´ð£¬Íò·Ö¸Ðл |
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