I have a question concerning the details of the desi_dr1.x1p5__zpix__sdss_dr17__specobj table.
This table appears to be the result of a cross-match between SDSS DR17 and DESI DR1, providing parameters that are crucial for matching these datasets. I truly appreciate the work that went into creating this resource; however, I am having trouble understanding the format of the id1 column.
When comparing id1 with most of the ID fields under the desi_dr1 catalog, I found that they do not match. In fact, there is a difference in the number of digits between them. As a result, I am unable to use the IDs from this table to retrieve subsequent DESI data.
Does anyone know how this id1 is constructed or which specific DESI identifier it corresponds to?