biabif Report for source archives

San Francisco, California, 2024 General Election

Audit Engine version:'v2.32.X'

Run Date: 2026-10-27 15:08:38.970613 Copyright (c) Citizens' Oversight


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Introduction

This report details information about the ballot image archives provided by the election district. These ballot image archives are typically provided as ZIP archives, but they may also be PDF files with many 1000s of images of sheets in some cases. Here, we review the sizes of the images and whether there are any repeated ballot_ids. This does not examine the images to find repeats, but simply marks them as repeats if they have the same ballot_id. The ballot_id of each ballot sheet must be unique. If there are multiple-sheet ballots, they will have multiple images that are not kept together.

Ballot Image Archives Summary

Parameter Value
Raw Number of Files 1,604,382
Unique ballot_ids 1,604,380
num_skipped_dups 1
num precincts 510
Number of parties 0
Number of groups 2
Number of batchids 27,558
Number of BMD ballots detected 307,203
Largest ballot image (bytes) 20,499,456
Smallest ballot image (bytes) 35,021
Number of huge files (> 6 * sigma) 1,181
idx archive basename files image_files all ballotids num uniques within set repeats num prior repeats num skipped repeats num BMDs num precincts num parties num groups num batchids lowest ballotid highest ballotid
0 'D05.zip' 133,371 133,371 133,371 133,371 0 0 0 21,662 43 0 2 11,149 0 0
1 'D01.zip' 154,643 154,643 154,643 154,643 0 0 0 25,021 43 0 2 10,638 0 0
2 'D02.zip' 165,546 165,546 165,546 165,546 0 0 0 43,681 47 0 2 11,447 0 0
3 'D03.zip' 130,996 130,995 130,994 130,994 0 0 1 16,164 41 0 2 10,246 0 0
4 'D04.zip' 153,648 153,648 153,648 153,648 0 0 0 40,115 47 0 2 10,757 0 0
5 'D06.zip' 106,636 106,636 106,636 106,636 0 0 0 27,160 41 0 2 9,304 0 0
6 'D07.zip' 168,275 168,275 168,275 168,275 0 0 0 33,957 50 0 2 12,011 0 0
7 'D08.zip' 203,597 203,597 203,597 203,597 0 0 0 53,232 57 0 2 13,097 0 0
8 'D09.zip' 145,039 145,039 145,039 145,039 0 0 0 10,058 45 0 2 11,219 0 0
9 'D10.zip' 115,609 115,609 115,609 115,609 0 0 0 29,133 51 0 2 10,107 0 0
10 'D11.zip' 126,504 126,504 126,504 126,504 0 0 0 6,921 45 0 2 10,675 0 0
11 'Supplemental.zip' 518 518 518 518 0 0 0 99 122 0 2 27 0 0
1,604,382 1,604,381 1,604,380 1,604,380 0 0 1 307,203 120,677
idx archive basename all ballotids unique within set repeats prior repeats total skipped repeats
0 D05.zip 133371 133371 0 0 0
1 D01.zip 154643 154643 0 0 0
2 D02.zip 165546 165546 0 0 0
3 D03.zip 130994 130994 1 0 1
4 D04.zip 153648 153648 0 0 0
5 D06.zip 106636 106636 0 0 0
6 D07.zip 168275 168275 0 0 0
7 D08.zip 203597 203597 0 0 0
8 D09.zip 145039 145039 0 0 0
9 D10.zip 115609 115609 0 0 0
10 D11.zip 126504 126504 0 0 0
11 Supplemental.zip 518 518 0 0 0

Ballot Image File Size Extremes

ballot_id size (bytes)
00009_01433_000001 35,021
00662_00000_3090149 20,499,456

Huge Ballot Files

File sizes over over the mean by 6 sigma (741,300 bytes) may be red flags. Huge files may be due to saving uncompressed images and/or color images due to redaction of initials or other PII. Sample of 1181 ballot images that are 'Huge'

ballot_id batchid archive_basename file_path file_path2 ... is_cvr_adjudicated image_h image_w hmb_rawcode bmd_barcode
00009_01542_000034 00009_01542 D05.zip D05/Pre_PCT 7505/CGr_Vote by Mail/00009_01542_000034.tif ...
00006_00406_000040 00006_00406 D05.zip D05/Pre_PCT 7506/CGr_Vote by Mail/00006_00406_000040.tif ...
00017_00149_000025 00017_00149 D05.zip D05/Pre_PCT 7506/CGr_Vote by Mail/00017_00149_000025.tif ...
00017_00149_000026 00017_00149 D05.zip D05/Pre_PCT 7506/CGr_Vote by Mail/00017_00149_000026.tif ...
00017_00150_000001 00017_00150 D05.zip D05/Pre_PCT 7506/CGr_Vote by Mail/00017_00150_000001.tif ...
... ... ... ... ... ... ... ... ... ... ...
00008_00894_000005 00008_00894 D11.zip D11/Pre_PCT 1149/CGr_Vote by Mail/00008_00894_000005.tif ...
00008_00894_000007 00008_00894 D11.zip D11/Pre_PCT 1149/CGr_Vote by Mail/00008_00894_000007.tif ...
00010_01062_000023 00010_01062 D11.zip D11/Pre_PCT 1149/CGr_Vote by Mail/00010_01062_000023.tif ...
00011_00874_000025 00011_00874 D11.zip D11/Pre_PCT 1149/CGr_Vote by Mail/00011_00874_000025.tif ...
00017_00055_000080 00017_00055 D11.zip D11/Pre_PCT 1149/CGr_Vote by Mail/00017_00055_000080.tif ...

%% daf rows=1181; cols=52; keyfield='ballot_id'; name=''


End of biabif Report for source archives

San Francisco, California, 2024 General Election

Audit Engine version:'v2.32.X'

Run Date: 2026-10-27 15:09:21.264234 Copyright (c) Citizens' Oversight


Return to Master Report Index