{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:3LZVCOFWZMSZQKLSH2J7AYHSO2","short_pith_number":"pith:3LZVCOFW","canonical_record":{"source":{"id":"1812.08624","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2018-12-20T15:05:21Z","cross_cats_sorted":[],"title_canon_sha256":"404418c2461a91b707d1d7696df51daad5a75e8770e8f711a6c97a257055ff11","abstract_canon_sha256":"e049978c4c3a5d1f2ce631091b568cd38efabae88981103f4a26511803cc9272"},"schema_version":"1.0"},"canonical_sha256":"daf35138b6cb259829723e93f060f2768d706fc6161702dd557ddfe0a1175971","source":{"kind":"arxiv","id":"1812.08624","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1812.08624","created_at":"2026-05-17T23:57:49Z"},{"alias_kind":"arxiv_version","alias_value":"1812.08624v1","created_at":"2026-05-17T23:57:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1812.08624","created_at":"2026-05-17T23:57:49Z"},{"alias_kind":"pith_short_12","alias_value":"3LZVCOFWZMSZ","created_at":"2026-05-18T12:32:02Z"},{"alias_kind":"pith_short_16","alias_value":"3LZVCOFWZMSZQKLS","created_at":"2026-05-18T12:32:02Z"},{"alias_kind":"pith_short_8","alias_value":"3LZVCOFW","created_at":"2026-05-18T12:32:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:3LZVCOFWZMSZQKLSH2J7AYHSO2","target":"record","payload":{"canonical_record":{"source":{"id":"1812.08624","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2018-12-20T15:05:21Z","cross_cats_sorted":[],"title_canon_sha256":"404418c2461a91b707d1d7696df51daad5a75e8770e8f711a6c97a257055ff11","abstract_canon_sha256":"e049978c4c3a5d1f2ce631091b568cd38efabae88981103f4a26511803cc9272"},"schema_version":"1.0"},"canonical_sha256":"daf35138b6cb259829723e93f060f2768d706fc6161702dd557ddfe0a1175971","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:57:49.511934Z","signature_b64":"RoWU2OJ/OdeX25knUHPBBWCg+C1Y07KOmNc+kS1d8+Hv5rXAmotq1ZcgYoRMl/XNIF7Bj+umn8Kg48g2mhPbDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"daf35138b6cb259829723e93f060f2768d706fc6161702dd557ddfe0a1175971","last_reissued_at":"2026-05-17T23:57:49.511295Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:57:49.511295Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1812.08624","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":"2026-05-17T23:57:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tixvZazZseq/Sd4NDl9g0Yagott9+N89xNOB02X5wVofdVryw0uwS9uiQB9d0ucWbgG9zrdY+QbJxqt2l8kQBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T19:11:52.409240Z"},"content_sha256":"d0047b310ab820a651f69f9fd57e5c4a2b6bc7626ad71e608bdd98941e64b48c","schema_version":"1.0","event_id":"sha256:d0047b310ab820a651f69f9fd57e5c4a2b6bc7626ad71e608bdd98941e64b48c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:3LZVCOFWZMSZQKLSH2J7AYHSO2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Automated detection of block falls in the north polar region of Mars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.CV","authors_text":"E. Hauber, J. Oberst, K. Gwinner, L. Fanara","submitted_at":"2018-12-20T15:05:21Z","abstract_excerpt":"We developed a change detection method for the identification of ice block falls using NASA's HiRISE images of the north polar scarps on Mars. Our method is based on a Support Vector Machine (SVM), trained using Histograms of Oriented Gradients (HOG), and on blob detection. The SVM detects potential new blocks between a set of images; the blob detection, then, confirms the identification of a block inside the area indicated by the SVM and derives the shape of the block. The results from the automatic analysis were compared with block statistics from visual inspection. We tested our method in 6"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1812.08624","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":""},"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":"2026-05-17T23:57:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ip6IWECIR5FEzBfQnd7WdlsHRBHQq3aGzXoXUEXk7LhC6ERgsZCw/PWu6REVbqXk14DR2l2F9wtiIxf+TrVjDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T19:11:52.409912Z"},"content_sha256":"65c4469b9bcf0b814d8553897f8734c16ff762a58a2996be69278a5ff0c35990","schema_version":"1.0","event_id":"sha256:65c4469b9bcf0b814d8553897f8734c16ff762a58a2996be69278a5ff0c35990"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3LZVCOFWZMSZQKLSH2J7AYHSO2/bundle.json","state_url":"https://pith.science/pith/3LZVCOFWZMSZQKLSH2J7AYHSO2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3LZVCOFWZMSZQKLSH2J7AYHSO2/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":"2026-05-27T19:11:52Z","links":{"resolver":"https://pith.science/pith/3LZVCOFWZMSZQKLSH2J7AYHSO2","bundle":"https://pith.science/pith/3LZVCOFWZMSZQKLSH2J7AYHSO2/bundle.json","state":"https://pith.science/pith/3LZVCOFWZMSZQKLSH2J7AYHSO2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3LZVCOFWZMSZQKLSH2J7AYHSO2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:3LZVCOFWZMSZQKLSH2J7AYHSO2","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":"e049978c4c3a5d1f2ce631091b568cd38efabae88981103f4a26511803cc9272","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2018-12-20T15:05:21Z","title_canon_sha256":"404418c2461a91b707d1d7696df51daad5a75e8770e8f711a6c97a257055ff11"},"schema_version":"1.0","source":{"id":"1812.08624","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1812.08624","created_at":"2026-05-17T23:57:49Z"},{"alias_kind":"arxiv_version","alias_value":"1812.08624v1","created_at":"2026-05-17T23:57:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1812.08624","created_at":"2026-05-17T23:57:49Z"},{"alias_kind":"pith_short_12","alias_value":"3LZVCOFWZMSZ","created_at":"2026-05-18T12:32:02Z"},{"alias_kind":"pith_short_16","alias_value":"3LZVCOFWZMSZQKLS","created_at":"2026-05-18T12:32:02Z"},{"alias_kind":"pith_short_8","alias_value":"3LZVCOFW","created_at":"2026-05-18T12:32:02Z"}],"graph_snapshots":[{"event_id":"sha256:65c4469b9bcf0b814d8553897f8734c16ff762a58a2996be69278a5ff0c35990","target":"graph","created_at":"2026-05-17T23:57:49Z","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"},"paper":{"abstract_excerpt":"We developed a change detection method for the identification of ice block falls using NASA's HiRISE images of the north polar scarps on Mars. Our method is based on a Support Vector Machine (SVM), trained using Histograms of Oriented Gradients (HOG), and on blob detection. The SVM detects potential new blocks between a set of images; the blob detection, then, confirms the identification of a block inside the area indicated by the SVM and derives the shape of the block. The results from the automatic analysis were compared with block statistics from visual inspection. We tested our method in 6","authors_text":"E. Hauber, J. Oberst, K. Gwinner, L. Fanara","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2018-12-20T15:05:21Z","title":"Automated detection of block falls in the north polar region of Mars"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1812.08624","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:d0047b310ab820a651f69f9fd57e5c4a2b6bc7626ad71e608bdd98941e64b48c","target":"record","created_at":"2026-05-17T23:57:49Z","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":"e049978c4c3a5d1f2ce631091b568cd38efabae88981103f4a26511803cc9272","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2018-12-20T15:05:21Z","title_canon_sha256":"404418c2461a91b707d1d7696df51daad5a75e8770e8f711a6c97a257055ff11"},"schema_version":"1.0","source":{"id":"1812.08624","kind":"arxiv","version":1}},"canonical_sha256":"daf35138b6cb259829723e93f060f2768d706fc6161702dd557ddfe0a1175971","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"daf35138b6cb259829723e93f060f2768d706fc6161702dd557ddfe0a1175971","first_computed_at":"2026-05-17T23:57:49.511295Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:57:49.511295Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"RoWU2OJ/OdeX25knUHPBBWCg+C1Y07KOmNc+kS1d8+Hv5rXAmotq1ZcgYoRMl/XNIF7Bj+umn8Kg48g2mhPbDQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:57:49.511934Z","signed_message":"canonical_sha256_bytes"},"source_id":"1812.08624","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d0047b310ab820a651f69f9fd57e5c4a2b6bc7626ad71e608bdd98941e64b48c","sha256:65c4469b9bcf0b814d8553897f8734c16ff762a58a2996be69278a5ff0c35990"],"state_sha256":"ddc5fd6a02b88831c8816761387491ea270f97043c6752cceae0a61332e460f8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fpM/jyEkg7wRfHR5CGXFjqDsSMrkG4sI2YXAiIczCWx+oV3Ag3jwV6D9UAFWGjXyX5kY5HCATTXBaDiqHrecAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T19:11:52.412868Z","bundle_sha256":"5ffe033309adc3f1a8eaf39d509bdb1201b9a6a5c0b95ff9b10bd4db1f733246"}}