danvk/mapsnap

View on GitHub

Automatically georeference old Sanborn Insurance Maps

Stars: 12
Forks: 2
Open beginner issues: 0
Indexed issues: 98
Avg merge: 13h 21m
Merged PRs (30d): 98

Dominant language: Python
License: Apache-2.0
Last GitHub push: Sep 19, 2026
Latest indexed: Sep 20, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

Open All

98 open issues indexed

CRNN conflict repair turns an invalid decode into a confident valid page number Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

danvk/mapsnap#480 · Opened Sep 19, 2026
Key-map page-number reads flip on ±1 gray-level changes; read at several intensity offsets and keep the consensus Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

danvk/mapsnap#479 · Opened Sep 19, 2026
Broadened-tier scale gate trusts fragment key-map regions, so one wrong page-number read costs a correctly fitted page Open

Difficulty 4/5 3-5 days Newbie friendliness 68/100

danvk/mapsnap#478 · 1 comment · Opened Sep 18, 2026
The mirror and run-loc render the same scan differently, and split disagrees on 7% of sheets Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

danvk/mapsnap#471 · 3 comments · Opened Sep 18, 2026
The mirror drops every non-numeric page key, losing 43 CBD volumes Open

Difficulty 5/5 Over a week Newbie friendliness 42/100

danvk/mapsnap#467 · Opened Sep 18, 2026
If only 1/2 keymaps georeference, half the pages are poisoned Open

bug georef keymap

Difficulty 3/5 1-2 days Newbie friendliness 55/100

danvk/mapsnap#456 · Opened Sep 17, 2026
Replace the hand-rolled fleet with a Docker image and AWS Batch Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

danvk/mapsnap#448 · 2 comments · Opened Sep 16, 2026
Read panels.json for split information in debugger Open

debugger

Difficulty 3/5 1-2 days Newbie friendliness 55/100

danvk/mapsnap#440 · Opened Sep 16, 2026
Incorporate location_city as a location hint Open

georef

Difficulty 4/5 3-5 days Newbie friendliness 48/100

danvk/mapsnap#439 · Opened Sep 16, 2026
Case-colliding page keys silently drop 11 sheets and leave phantom metadata rows Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

danvk/mapsnap#423 · Opened Sep 14, 2026
Use P(road) continuity as a pairwise energy signal Open

reconciler

Difficulty 4/5 3-5 days Newbie friendliness 45/100

danvk/mapsnap#410 · Opened Sep 12, 2026
Show scale and rotation histograms in volume viewer Open

debugger

Difficulty 3/5 1-2 days Newbie friendliness 63/100

danvk/mapsnap#409 · Opened Sep 12, 2026
Key-map detection floor (MIN_DISTINCT = 6) makes key maps undetectable in volumes with fewer than six sheets Open

keymap

Difficulty 3/5 1-2 days Newbie friendliness 68/100

danvk/mapsnap#405 · 1 comment · Opened Sep 10, 2026
Use the rotated margin street labels (continuation labels) in georef Open

Difficulty 5/5 Over a week Newbie friendliness 42/100

danvk/mapsnap#400 · Opened Sep 8, 2026
Shared GCPs between pages: corroboration, alias rescue and a reconcile factor Open

Difficulty 5/5 Over a week Newbie friendliness 45/100

danvk/mapsnap#399 · Opened Sep 7, 2026
ocr --resume re-reads every page since the fine-tuned recognizer became the default Open

Difficulty 3/5 1-2 days Newbie friendliness 78/100

danvk/mapsnap#398 · Opened Sep 7, 2026
Create a script to do baseline runs Open

Difficulty 3/5 1-2 days Newbie friendliness 66/100

danvk/mapsnap#395 · Opened Sep 6, 2026
Georeference secondary key maps cut from a key-map sheet Open

Difficulty 4/5 3-5 days Newbie friendliness 68/100

danvk/mapsnap#390 · Opened Sep 2, 2026
Chicago key map: a stale p0 sidecar and a split that severs 7 page labels are cancelling each other out Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

danvk/mapsnap#378 · 1 comment · Opened Sep 2, 2026
street-solve: the remaining 1,628s/run is the polish path #339 did not vectorize, not the proposal loop Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

danvk/mapsnap#377 · Opened Sep 1, 2026
Confident street reads are silently dropped when the OSM name carries an unstrippable leading word (JO JOHNSTON, NEW JERSEY, GENERAL PERSHING) Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

danvk/mapsnap#373 · Opened Sep 1, 2026
Visualize street solver Open

debugger

Difficulty 3/5 1-2 days Newbie friendliness 58/100

danvk/mapsnap#369 · Opened Sep 1, 2026
Use self-number stamps as a split prior; divider-candidate cap vetoes real splits Open

adjacency split

Difficulty 4/5 3-5 days Newbie friendliness 48/100

danvk/mapsnap#368 · Opened Aug 31, 2026
A legible stray character poisons the vocabulary-constrained decode Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

danvk/mapsnap#365 · 2 comments · Opened Aug 29, 2026
Allow self-adjacency for splits Open

adjacency

Difficulty 3/5 1-2 days Newbie friendliness 64/100

danvk/mapsnap#359 · Opened Aug 28, 2026
Split-page seam claims are classified as 'center' and dropped (panel bbox vs panel shape) Open

adjacency

Difficulty 4/5 3-5 days Newbie friendliness 48/100

danvk/mapsnap#358 · Opened Aug 28, 2026
Run mapsnap over all volumes in the Library of Congress Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

danvk/mapsnap#354 · 2 comments · Opened Aug 28, 2026
Promote one-sided adjacency claims closed by mutual-edge cycles Open

adjacency

Difficulty 4/5 3-5 days Newbie friendliness 48/100

danvk/mapsnap#353 · 1 comment · Opened Aug 27, 2026
Content-region overlap as a wrong-fit signal and gap-filling constraint Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

danvk/mapsnap#352 · 6 comments · Opened Aug 26, 2026
Per-page adaptive working scale: coarse sheets need 50% imagery (measured on asheville) Open

Difficulty 5/5 Over a week Newbie friendliness 45/100

danvk/mapsnap#351 · 1 comment · Opened Aug 25, 2026
Adjust RMSE threshold for scale Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

danvk/mapsnap#345 · Opened Aug 22, 2026
RANSAC runner-up poses: emit near-ties, let snap/reconcile arbitrate them Open

reconciler

Difficulty 4/5 3-5 days Newbie friendliness 54/100

danvk/mapsnap#340 · 2 comments · Opened Aug 21, 2026
Failed-fit pages should offer their candidate GCPs as location priors Open

Difficulty 5/5 Over a week Newbie friendliness 42/100

danvk/mapsnap#335 · 2 comments · Opened Aug 16, 2026
Pages with no channel sidecar get no georef-final (contract gap #2) Open

Difficulty 3/5 1-2 days Newbie friendliness 70/100

danvk/mapsnap#334 · Opened Aug 15, 2026
Snap debugger view: alignment canvas, verification breakdown, candidate/decision explorer Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

danvk/mapsnap#325 · Opened Aug 14, 2026
Incremental fit: re-run only pages whose stage inputs changed Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

danvk/mapsnap#320 · Opened Aug 14, 2026
Auto-label keymap page numbers from OIM georeferencing (#316 phase 3) Open

Difficulty 5/5 Over a week Newbie friendliness 48/100

danvk/mapsnap#319 · Opened Aug 13, 2026
Adjacency numbers should be excluded from street detection Open

adjacency ocr

Difficulty 3/5 1-2 days Newbie friendliness 55/100

danvk/mapsnap#304 · 1 comment · Opened Aug 12, 2026
Link to OIM in the volume viewer Open

debugger

Difficulty 3/5 1-2 days Newbie friendliness 58/100

danvk/mapsnap#298 · 1 comment · Opened Aug 11, 2026
reconcile: a rotation-consistency energy term, conditioned on whether the neighbours agree Open

reconciler

Difficulty 5/5 Over a week Newbie friendliness 35/100

danvk/mapsnap#295 · Opened Aug 10, 2026
Make the score not a cliff Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

danvk/mapsnap#294 · Opened Aug 10, 2026
min_confidence=0.15 is a compromise the volumes disagree about (7-point spread after the recognizer change) Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

danvk/mapsnap#285 · Opened Aug 10, 2026
snap: candidates.jsonl never expires records, so a re-split page keeps its whole-page fit Open

Difficulty 4/5 3-5 days Newbie friendliness 62/100

danvk/mapsnap#275 · Opened Aug 8, 2026
Audit the 261 rotation-twin pairs where both orientations read ≥0.15 Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

danvk/mapsnap#271 · 2 comments · Opened Aug 8, 2026
Consolidate the fit pipeline's gates and rescues into a pose-graph reconciliation Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 32/100

danvk/mapsnap#270 · 4 comments · Opened Aug 8, 2026
keymap recognition: claim loop with trust tiers, assignment decoding, and an OIM training-data harvest Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

danvk/mapsnap#261 · 1 comment · Opened Aug 6, 2026
georef: quadrant-aliased RANSAC ties (0.9%) decided without the anchored keymap prior; outlier gate rejects instead of re-ranking Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 48/100

danvk/mapsnap#259 · Opened Aug 6, 2026
fit: stale p*.contradiction.json survives clear_derived_sidecars and steers the next run's snap Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

danvk/mapsnap#258 · 1 comment · Opened Aug 6, 2026
debugger: streets view filter does not match georef's selection Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 56/100

danvk/mapsnap#257 · Opened Aug 6, 2026
adjacency-gate: missed adjacency stamps bias the contradiction distance upward Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 48/100

danvk/mapsnap#255 · Opened Aug 6, 2026

danvk/mapsnap

Get new issues in your inbox