{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:EGH72KIJ4JXUD4OXKQSINHAS6B","short_pith_number":"pith:EGH72KIJ","canonical_record":{"source":{"id":"2401.06154","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CY","submitted_at":"2023-12-21T08:59:47Z","cross_cats_sorted":["cs.SI"],"title_canon_sha256":"461a6fd61cac15e5aa698ef132c94802e137da3d1de30c678ed894f7c4ffd3a7","abstract_canon_sha256":"bc7fb9979f61d365849cc508dba7bbdd735f170464ef2194faa07445676a00ec"},"schema_version":"1.0"},"canonical_sha256":"218ffd2909e26f41f1d75424869c12f06232d227ff142215aad49740964380e3","source":{"kind":"arxiv","id":"2401.06154","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2401.06154","created_at":"2026-07-05T07:32:46Z"},{"alias_kind":"arxiv_version","alias_value":"2401.06154v1","created_at":"2026-07-05T07:32:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2401.06154","created_at":"2026-07-05T07:32:46Z"},{"alias_kind":"pith_short_12","alias_value":"EGH72KIJ4JXU","created_at":"2026-07-05T07:32:46Z"},{"alias_kind":"pith_short_16","alias_value":"EGH72KIJ4JXUD4OX","created_at":"2026-07-05T07:32:46Z"},{"alias_kind":"pith_short_8","alias_value":"EGH72KIJ","created_at":"2026-07-05T07:32:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:EGH72KIJ4JXUD4OXKQSINHAS6B","target":"record","payload":{"canonical_record":{"source":{"id":"2401.06154","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CY","submitted_at":"2023-12-21T08:59:47Z","cross_cats_sorted":["cs.SI"],"title_canon_sha256":"461a6fd61cac15e5aa698ef132c94802e137da3d1de30c678ed894f7c4ffd3a7","abstract_canon_sha256":"bc7fb9979f61d365849cc508dba7bbdd735f170464ef2194faa07445676a00ec"},"schema_version":"1.0"},"canonical_sha256":"218ffd2909e26f41f1d75424869c12f06232d227ff142215aad49740964380e3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T07:32:46.273705Z","signature_b64":"/Hq64UYI+tREJw8AJEslFfIPwufuvxDbXOH0thXEMPq+TkL2iGMMrJ6vffZ7Gf7MTJWG0iOgH+nOyWtwsWQYCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"218ffd2909e26f41f1d75424869c12f06232d227ff142215aad49740964380e3","last_reissued_at":"2026-07-05T07:32:46.273269Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T07:32:46.273269Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2401.06154","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":"2026-07-05T07:32:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+awEtWroluNFxO4oXGWe1A3e5CRiKQ2DczP5yqf5OVkdA2S1+nkwZiy1P4K01F9oTSvK23ZkdO9CwBzl/BbxCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T06:48:40.653777Z"},"content_sha256":"c0fc04c777bb786760cf31aadc6a49798696878954b4024793f8a890d0469966","schema_version":"1.0","event_id":"sha256:c0fc04c777bb786760cf31aadc6a49798696878954b4024793f8a890d0469966"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:EGH72KIJ4JXUD4OXKQSINHAS6B","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Comparison of home detection algorithms using smartphone GPS data","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cs.SI"],"primary_cat":"cs.CY","authors_text":"Rajat Verma, Satish V. Ukkusuri, Shagun Mittal, Xiaowei Chen, Zengxiang Lei","submitted_at":"2023-12-21T08:59:47Z","abstract_excerpt":"Estimation of people's home locations using location-based services data from smartphones is a common task in human mobility assessment. However, commonly used home detection algorithms (HDAs) are often arbitrary and unexamined. In this study, we review existing HDAs and examine five HDAs using eight high-quality mobile phone geolocation datasets. These include four commonly used HDAs as well as an HDA proposed in this work. To make quantitative comparisons, we propose three novel metrics to assess the quality of detected home locations and test them on eight datasets across four U.S. cities. "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2401.06154","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/2401.06154/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":"2026-07-05T07:32:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aE861VJ8aYSvEfaFpWbMqADG6Do8GBJe/Q1eBGCni66IkkEb346rOur/HaOYsu9X+KB9e+Jjv6GLnxx2QKF5BQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T06:48:40.654266Z"},"content_sha256":"96cebcc4ff9402700161cfca01a46c300557d9fac2f2d567ccd30eca28992841","schema_version":"1.0","event_id":"sha256:96cebcc4ff9402700161cfca01a46c300557d9fac2f2d567ccd30eca28992841"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EGH72KIJ4JXUD4OXKQSINHAS6B/bundle.json","state_url":"https://pith.science/pith/EGH72KIJ4JXUD4OXKQSINHAS6B/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EGH72KIJ4JXUD4OXKQSINHAS6B/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":"2026-08-06T06:48:40Z","links":{"resolver":"https://pith.science/pith/EGH72KIJ4JXUD4OXKQSINHAS6B","bundle":"https://pith.science/pith/EGH72KIJ4JXUD4OXKQSINHAS6B/bundle.json","state":"https://pith.science/pith/EGH72KIJ4JXUD4OXKQSINHAS6B/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EGH72KIJ4JXUD4OXKQSINHAS6B/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:EGH72KIJ4JXUD4OXKQSINHAS6B","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":"bc7fb9979f61d365849cc508dba7bbdd735f170464ef2194faa07445676a00ec","cross_cats_sorted":["cs.SI"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CY","submitted_at":"2023-12-21T08:59:47Z","title_canon_sha256":"461a6fd61cac15e5aa698ef132c94802e137da3d1de30c678ed894f7c4ffd3a7"},"schema_version":"1.0","source":{"id":"2401.06154","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2401.06154","created_at":"2026-07-05T07:32:46Z"},{"alias_kind":"arxiv_version","alias_value":"2401.06154v1","created_at":"2026-07-05T07:32:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2401.06154","created_at":"2026-07-05T07:32:46Z"},{"alias_kind":"pith_short_12","alias_value":"EGH72KIJ4JXU","created_at":"2026-07-05T07:32:46Z"},{"alias_kind":"pith_short_16","alias_value":"EGH72KIJ4JXUD4OX","created_at":"2026-07-05T07:32:46Z"},{"alias_kind":"pith_short_8","alias_value":"EGH72KIJ","created_at":"2026-07-05T07:32:46Z"}],"graph_snapshots":[{"event_id":"sha256:96cebcc4ff9402700161cfca01a46c300557d9fac2f2d567ccd30eca28992841","target":"graph","created_at":"2026-07-05T07:32:46Z","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/2401.06154/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Estimation of people's home locations using location-based services data from smartphones is a common task in human mobility assessment. However, commonly used home detection algorithms (HDAs) are often arbitrary and unexamined. In this study, we review existing HDAs and examine five HDAs using eight high-quality mobile phone geolocation datasets. These include four commonly used HDAs as well as an HDA proposed in this work. To make quantitative comparisons, we propose three novel metrics to assess the quality of detected home locations and test them on eight datasets across four U.S. cities. ","authors_text":"Rajat Verma, Satish V. Ukkusuri, Shagun Mittal, Xiaowei Chen, Zengxiang Lei","cross_cats":["cs.SI"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CY","submitted_at":"2023-12-21T08:59:47Z","title":"Comparison of home detection algorithms using smartphone GPS data"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2401.06154","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:c0fc04c777bb786760cf31aadc6a49798696878954b4024793f8a890d0469966","target":"record","created_at":"2026-07-05T07:32:46Z","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":"bc7fb9979f61d365849cc508dba7bbdd735f170464ef2194faa07445676a00ec","cross_cats_sorted":["cs.SI"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CY","submitted_at":"2023-12-21T08:59:47Z","title_canon_sha256":"461a6fd61cac15e5aa698ef132c94802e137da3d1de30c678ed894f7c4ffd3a7"},"schema_version":"1.0","source":{"id":"2401.06154","kind":"arxiv","version":1}},"canonical_sha256":"218ffd2909e26f41f1d75424869c12f06232d227ff142215aad49740964380e3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"218ffd2909e26f41f1d75424869c12f06232d227ff142215aad49740964380e3","first_computed_at":"2026-07-05T07:32:46.273269Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T07:32:46.273269Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/Hq64UYI+tREJw8AJEslFfIPwufuvxDbXOH0thXEMPq+TkL2iGMMrJ6vffZ7Gf7MTJWG0iOgH+nOyWtwsWQYCQ==","signature_status":"signed_v1","signed_at":"2026-07-05T07:32:46.273705Z","signed_message":"canonical_sha256_bytes"},"source_id":"2401.06154","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c0fc04c777bb786760cf31aadc6a49798696878954b4024793f8a890d0469966","sha256:96cebcc4ff9402700161cfca01a46c300557d9fac2f2d567ccd30eca28992841"],"state_sha256":"c8b499cc7b05863f5e415287aa4091f7f4a5d42f8bff627eca7a63f18e987162"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+wA4W8RzYaTBsobTiS+x4PsxLBOG+ZDdG1sGqLKBxg+BUHfg4NqN56FRYvU4xkx0XyzKtvlaSy9GCEpZkWgcBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-06T06:48:40.657746Z","bundle_sha256":"f21662751a5a805ed472780a625b77d6090cf012713ce22c44426448f487a831"}}