`EXISTENCE_MASK` Field in BANDSB TRE Displays as 0 Despite Setting Values

[samrat-boda]

I am experiencing an issue with the EXISTENCE_MASK field in the BANDSB TRE of a SNIP file, where the allocated field size appears to be insufficient.

Problems:

1. Setting EXISTENCE_MASK Values Not Working:
   When attempting to set values for the EXISTENCE_MASK field in BANDSB TRE of SNIP files, the assigned values are not being recognized. Despite setting numerical values for EXISTENCE_MASK, it consistently displays as 0 when the TREs are printed.

2. Insufficient Space for EXISTENCE_MASK in BANDSB TRE:
   The EXISTENCE_MASK field in the BANDSB TRE of SNIP files is allocated only 4 characters of space. This limitation poses a problem as it doesn't accommodate larger numerical values, causing potential data truncation or loss.

"BANDSB": {
                   "COUNT": "3",
                   "RADIOMETRIC_QUANTITY": "RADIANCE",
                   "RADIOMETRIC_QUANTITY_UNIT": "S",
                   "SCALE_FACTOR": "80",
                   "ADDITIVE_FACTOR": "0",
                   "ROW_GSD": "0030.49",
                   "ROW_GSD_UNIT": "M",
                   "COL_GSD": "0029.96",
                   "COL_GSD_UNIT": "M",
                   "SPT_RESP_ROW": "-------",
                   "SPT_RESP_UNIT_ROW": "M",
                   "SPT_RESP_COL": "-------",
                   "SPT_RESP_UNIT_COL": "M",
                   "DATA_FLD_1": " ",
                   "EXISTENCE_MASK": "960",
                   "DATA_FLD_3[0]": "1",
                   "DATA_FLD_4[0]": "1",
                   "DATA_FLD_5[0]": "1",
                   "DATA_FLD_6[0]": "1",
                   "DATA_FLD_3[1]": "2",
                   "DATA_FLD_4[1]": "3",
                   "DATA_FLD_5[1]": "4",
                   "DATA_FLD_6[1]": "5",
                   "DATA_FLD_3[2]": "7",
                   "DATA_FLD_4[2]": "4",
                   "DATA_FLD_5[2]": "5",
                   "DATA_FLD_6[2]": "6"
               }

--- Image [1] XHD TRE [BANDSB] - (122) ---
COUNT(5) = '00003'
RADIOMETRIC_QUANTITY(24) = 'RADIANCE                '
RADIOMETRIC_QUANTITY_UNIT(1) = 'S'
SCALE_FACTOR(4) = '0'
ADDITIVE_FACTOR(4) = '0'
ROW_GSD(7) = '0030.49'
ROW_GSD_UNIT(1) = 'M'
COL_GSD(7) = '0029.96'
COL_GSD_UNIT(1) = 'M'
SPT_RESP_ROW(7) = '-------'
SPT_RESP_UNIT_ROW(1) = 'M'
SPT_RESP_COL(7) = '-------'
SPT_RESP_UNIT_COL(1) = 'M'
DATA_FLD_1(48) = ''
EXISTENCE_MASK(4) = '0'

Questions:

1. How can the issue of the EXISTENCE_MASK field displaying as 0 despite setting valid numerical values be addressed?
2. Is there a method to extend the space allocated for the EXISTENCE_MASK field in the BANDSB TRE to support larger numerical values?