{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:HQYL6GVLF2LQJYKVN4MJVWP3BD","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":"22efd00432c103534d2ecc5c03b9912007a4d96527c94d69906bc95b95c23f02","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.RO","submitted_at":"2018-02-17T19:03:41Z","title_canon_sha256":"f08508a2f170e7513e4841a7ebdd0c2407c8c61ac9356e325a953b32d6667728"},"schema_version":"1.0","source":{"id":"1802.06274","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.06274","created_at":"2026-05-18T00:23:03Z"},{"alias_kind":"arxiv_version","alias_value":"1802.06274v1","created_at":"2026-05-18T00:23:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.06274","created_at":"2026-05-18T00:23:03Z"},{"alias_kind":"pith_short_12","alias_value":"HQYL6GVLF2LQ","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_16","alias_value":"HQYL6GVLF2LQJYKV","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_8","alias_value":"HQYL6GVL","created_at":"2026-05-18T12:32:28Z"}],"graph_snapshots":[{"event_id":"sha256:57f993ec04ea0d7eeee120a25cdc4df695be3983e6dc1cdc78bcffad1bd83ad4","target":"graph","created_at":"2026-05-18T00:23:03Z","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":"Geographic information systems (GIS) now provide accurate maps of terrain, roads, waterways, and building footprints and heights. Aircraft, particularly small unmanned aircraft systems, can exploit additional information such as building roof structure to improve navigation accuracy and safety particularly in urban regions. This paper proposes a method to automatically label building roof shape types. Satellite imagery and LIDAR data from Witten, Germany are fed to convolutional neural networks (CNN) to extract salient feature vectors. Supervised training sets are automatically generated from ","authors_text":"Ella M. Atkins, Jeremy D. Castagno","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.RO","submitted_at":"2018-02-17T19:03:41Z","title":"Automatic Classification of Roof Shapes for Multicopter Emergency Landing Site Selection"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.06274","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":"sha256:066f4f2c40dd0603c8f89a9c8e9718b83f77bfbb72779577455a41c9205765de","target":"record","created_at":"2026-05-18T00:23:03Z","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":"22efd00432c103534d2ecc5c03b9912007a4d96527c94d69906bc95b95c23f02","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.RO","submitted_at":"2018-02-17T19:03:41Z","title_canon_sha256":"f08508a2f170e7513e4841a7ebdd0c2407c8c61ac9356e325a953b32d6667728"},"schema_version":"1.0","source":{"id":"1802.06274","kind":"arxiv","version":1}},"canonical_sha256":"3c30bf1aab2e9704e1556f189ad9fb08c971e4908d24de074d50d763eb1bfbef","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3c30bf1aab2e9704e1556f189ad9fb08c971e4908d24de074d50d763eb1bfbef","first_computed_at":"2026-05-18T00:23:03.831866Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:23:03.831866Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Oac0/WSJuXEEFPec5ipCZQL0vvgW1w73V0laTdUS1pD/kFsWcvitNzjmM3gc9+0xMQm/Ne0yhTpw5RDZR3I3Dw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:23:03.832564Z","signed_message":"canonical_sha256_bytes"},"source_id":"1802.06274","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:066f4f2c40dd0603c8f89a9c8e9718b83f77bfbb72779577455a41c9205765de","sha256:57f993ec04ea0d7eeee120a25cdc4df695be3983e6dc1cdc78bcffad1bd83ad4"],"state_sha256":"c525d0db5c0774156e9cb65040bef6f1304a34a667eccf9f589f98552e032fbb"}