biabif Report for source archives

San Francisco, California, 2024 General Election

Audit Engine version:'v2.32.X'

Run Date: 2026-10-12 19:18:08.394926 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 133,889
Unique ballot_ids 133,422
num_skipped_dups 0
num precincts 43
Number of parties 0
Number of groups 2
Number of batchids 11,157
Number of BMD ballots detected 21,675
Largest ballot image (bytes) 2,241,718
Smallest ballot image (bytes) 38,780
Number of huge files (> 6 * sigma) 136
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 'Supplemental.zip' 518 51 51 51 0 0 0 13 14 0 2 8 0 0
133,889 133,422 133,422 133,422 0 0 0 21,675 11,157
idx archive basename all ballotids unique within set repeats prior repeats total skipped repeats
0 D05.zip 133371 133371 0 0 0
1 Supplemental.zip 51 51 0 0 0

Ballot Image File Size Extremes

ballot_id size (bytes)
00026_00142_000033 38,780
00009_01416_000086 2,241,718

Huge Ballot Files

File sizes over over the mean by 6 sigma (723,549 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 136 ballot images that are 'Huge'

ballot_id batchid archive_basename file_paths file_size ... 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'] 1965468 ...
00006_00406_000040 00006_00406 D05.zip ['D05/Pre_PCT 7506/CGr_Vote by Mail/00006_00406_000040.tif'] 2124968 ...
00017_00149_000025 00017_00149 D05.zip ['D05/Pre_PCT 7506/CGr_Vote by Mail/00017_00149_000025.tif'] 1758182 ...
00017_00149_000026 00017_00149 D05.zip ['D05/Pre_PCT 7506/CGr_Vote by Mail/00017_00149_000026.tif'] 1837860 ...
00017_00150_000001 00017_00150 D05.zip ['D05/Pre_PCT 7506/CGr_Vote by Mail/00017_00150_000001.tif'] 1775648 ...
... ... ... ... ... ... ... ... ... ... ...
00012_00155_000013 00012_00155 D05.zip ['D05/Pre_PCT 9506/CGr_Vote by Mail/00012_00155_000013.tif'] 2105852 ...
00004_00900_000001 00004_00900 D05.zip ['D05/Pre_PCT 9507/CGr_Vote by Mail/00004_00900_000001.tif'] 1963218 ...
00011_00877_000073 00011_00877 D05.zip ['D05/Pre_PCT 9507/CGr_Vote by Mail/00011_00877_000073.tif'] 2131960 ...
01020_00000_2242554 01020_00000 D05.zip ['D05/Pre_PCT 9511/CGr_Election Day/01020_00000_2242554_2.tif'] 2036094 ...
00006_00829_000068 00006_00829 D05.zip ['D05/Pre_PCT 9512/CGr_Vote by Mail/00006_00829_000068.tif'] 1968200 ...

%% daf rows=136; cols=51; 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: 2026-10-12 19:18:13.049575 Copyright (c) Citizens' Oversight


Return to Master Report Index