{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:BBEQ2IDTMIUKRGNHTHNDTZXBOI","short_pith_number":"pith:BBEQ2IDT","canonical_record":{"source":{"id":"2101.01154","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CV","submitted_at":"2021-01-04T18:33:47Z","cross_cats_sorted":["cs.AI","cs.LG"],"title_canon_sha256":"1f5459ab41a9a679a6584ddf5332507aef003b1f3f7f080d966f27c0c97e8ba3","abstract_canon_sha256":"8705446f2a4f076fc7346ebcfdacb5291f8e880a9da74abbba77ceb693d9da3c"},"schema_version":"1.0"},"canonical_sha256":"08490d20736228a899a799da39e6e172310610ab0b73fe3d46aaa709a684b018","source":{"kind":"arxiv","id":"2101.01154","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2101.01154","created_at":"2026-07-05T02:04:25Z"},{"alias_kind":"arxiv_version","alias_value":"2101.01154v1","created_at":"2026-07-05T02:04:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2101.01154","created_at":"2026-07-05T02:04:25Z"},{"alias_kind":"pith_short_12","alias_value":"BBEQ2IDTMIUK","created_at":"2026-07-05T02:04:25Z"},{"alias_kind":"pith_short_16","alias_value":"BBEQ2IDTMIUKRGNH","created_at":"2026-07-05T02:04:25Z"},{"alias_kind":"pith_short_8","alias_value":"BBEQ2IDT","created_at":"2026-07-05T02:04:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:BBEQ2IDTMIUKRGNHTHNDTZXBOI","target":"record","payload":{"canonical_record":{"source":{"id":"2101.01154","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CV","submitted_at":"2021-01-04T18:33:47Z","cross_cats_sorted":["cs.AI","cs.LG"],"title_canon_sha256":"1f5459ab41a9a679a6584ddf5332507aef003b1f3f7f080d966f27c0c97e8ba3","abstract_canon_sha256":"8705446f2a4f076fc7346ebcfdacb5291f8e880a9da74abbba77ceb693d9da3c"},"schema_version":"1.0"},"canonical_sha256":"08490d20736228a899a799da39e6e172310610ab0b73fe3d46aaa709a684b018","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:04:25.235338Z","signature_b64":"AnNHSsaHRaPyEa0lN2UfDVAnvjJ9FBv0Ng7RChPqlF1XgJ1Mhl8uPqMZiADvxbG6QJKU5PR3NKkZa/UIXXMXDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"08490d20736228a899a799da39e6e172310610ab0b73fe3d46aaa709a684b018","last_reissued_at":"2026-07-05T02:04:25.234950Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:04:25.234950Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2101.01154","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T02:04:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OQiqWObo06ZtQLK2qeC08tCss9i2fBSX4kd/qNZgK9/CaBAUG0IyxwBKQM/8KGdD2R0Pu5C2AKBVjGHclpHZAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-27T04:50:42.232530Z"},"content_sha256":"8f11aad8166f23e926ce056c578539d73fa66619d3687598fa330de2c883753a","schema_version":"1.0","event_id":"sha256:8f11aad8166f23e926ce056c578539d73fa66619d3687598fa330de2c883753a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:BBEQ2IDTMIUKRGNHTHNDTZXBOI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"High-resolution land cover change from low-resolution labels: Simple baselines for the 2021 IEEE GRSS Data Fusion Contest","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cs.AI","cs.LG"],"primary_cat":"cs.CV","authors_text":"Caleb Robinson, Nebojsa Jojic, Nikolay Malkin","submitted_at":"2021-01-04T18:33:47Z","abstract_excerpt":"We present simple algorithms for land cover change detection in the 2021 IEEE GRSS Data Fusion Contest. The task of the contest is to create high-resolution (1m / pixel) land cover change maps of a study area in Maryland, USA, given multi-resolution imagery and label data. We study several baseline models for this task and discuss directions for further research.\n  See https://dfc2021.blob.core.windows.net/competition-data/dfc2021_index.txt for the data and https://github.com/calebrob6/dfc2021-msd-baseline for an implementation of these baselines."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2101.01154","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2101.01154/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T02:04:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PZbJVplPSz2/bAvbRj8DeHql4GdJA35Nl+xpeVP3w0HMGNxbCaJNnru/G4naAYgCYhp8MrpuJ05CqDT+EQC+Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-27T04:50:42.232898Z"},"content_sha256":"bc331a5e879ec493dd06b9642a374cdbde08c703aebabb19711c63e310b3fd62","schema_version":"1.0","event_id":"sha256:bc331a5e879ec493dd06b9642a374cdbde08c703aebabb19711c63e310b3fd62"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BBEQ2IDTMIUKRGNHTHNDTZXBOI/bundle.json","state_url":"https://pith.science/pith/BBEQ2IDTMIUKRGNHTHNDTZXBOI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BBEQ2IDTMIUKRGNHTHNDTZXBOI/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-07-27T04:50:42Z","links":{"resolver":"https://pith.science/pith/BBEQ2IDTMIUKRGNHTHNDTZXBOI","bundle":"https://pith.science/pith/BBEQ2IDTMIUKRGNHTHNDTZXBOI/bundle.json","state":"https://pith.science/pith/BBEQ2IDTMIUKRGNHTHNDTZXBOI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BBEQ2IDTMIUKRGNHTHNDTZXBOI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:BBEQ2IDTMIUKRGNHTHNDTZXBOI","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"8705446f2a4f076fc7346ebcfdacb5291f8e880a9da74abbba77ceb693d9da3c","cross_cats_sorted":["cs.AI","cs.LG"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CV","submitted_at":"2021-01-04T18:33:47Z","title_canon_sha256":"1f5459ab41a9a679a6584ddf5332507aef003b1f3f7f080d966f27c0c97e8ba3"},"schema_version":"1.0","source":{"id":"2101.01154","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2101.01154","created_at":"2026-07-05T02:04:25Z"},{"alias_kind":"arxiv_version","alias_value":"2101.01154v1","created_at":"2026-07-05T02:04:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2101.01154","created_at":"2026-07-05T02:04:25Z"},{"alias_kind":"pith_short_12","alias_value":"BBEQ2IDTMIUK","created_at":"2026-07-05T02:04:25Z"},{"alias_kind":"pith_short_16","alias_value":"BBEQ2IDTMIUKRGNH","created_at":"2026-07-05T02:04:25Z"},{"alias_kind":"pith_short_8","alias_value":"BBEQ2IDT","created_at":"2026-07-05T02:04:25Z"}],"graph_snapshots":[{"event_id":"sha256:bc331a5e879ec493dd06b9642a374cdbde08c703aebabb19711c63e310b3fd62","target":"graph","created_at":"2026-07-05T02:04:25Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2101.01154/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present simple algorithms for land cover change detection in the 2021 IEEE GRSS Data Fusion Contest. The task of the contest is to create high-resolution (1m / pixel) land cover change maps of a study area in Maryland, USA, given multi-resolution imagery and label data. We study several baseline models for this task and discuss directions for further research.\n  See https://dfc2021.blob.core.windows.net/competition-data/dfc2021_index.txt for the data and https://github.com/calebrob6/dfc2021-msd-baseline for an implementation of these baselines.","authors_text":"Caleb Robinson, Nebojsa Jojic, Nikolay Malkin","cross_cats":["cs.AI","cs.LG"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CV","submitted_at":"2021-01-04T18:33:47Z","title":"High-resolution land cover change from low-resolution labels: Simple baselines for the 2021 IEEE GRSS Data Fusion Contest"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2101.01154","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:8f11aad8166f23e926ce056c578539d73fa66619d3687598fa330de2c883753a","target":"record","created_at":"2026-07-05T02:04:25Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"8705446f2a4f076fc7346ebcfdacb5291f8e880a9da74abbba77ceb693d9da3c","cross_cats_sorted":["cs.AI","cs.LG"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CV","submitted_at":"2021-01-04T18:33:47Z","title_canon_sha256":"1f5459ab41a9a679a6584ddf5332507aef003b1f3f7f080d966f27c0c97e8ba3"},"schema_version":"1.0","source":{"id":"2101.01154","kind":"arxiv","version":1}},"canonical_sha256":"08490d20736228a899a799da39e6e172310610ab0b73fe3d46aaa709a684b018","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"08490d20736228a899a799da39e6e172310610ab0b73fe3d46aaa709a684b018","first_computed_at":"2026-07-05T02:04:25.234950Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:04:25.234950Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"AnNHSsaHRaPyEa0lN2UfDVAnvjJ9FBv0Ng7RChPqlF1XgJ1Mhl8uPqMZiADvxbG6QJKU5PR3NKkZa/UIXXMXDw==","signature_status":"signed_v1","signed_at":"2026-07-05T02:04:25.235338Z","signed_message":"canonical_sha256_bytes"},"source_id":"2101.01154","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8f11aad8166f23e926ce056c578539d73fa66619d3687598fa330de2c883753a","sha256:bc331a5e879ec493dd06b9642a374cdbde08c703aebabb19711c63e310b3fd62"],"state_sha256":"a59ada1d72917912549eba700a8845e51d9391debca8cbf4a79ce34f7db414ce"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6lfMFtBptLxtxlOUEb9kJRQaeGNZLe6PxDI3zGOO03oVreS3Zv5ECGrKu905pSaOaMSagLJ0BX5GZzZjlP0QDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-27T04:50:42.235352Z","bundle_sha256":"810cea22168ec450681fe44ef760ed2946c74710e1ec90a2f933da4d15c9b9bc"}}