{
  "schema_version": 1,
  "prepared_date": "2026-09-26",
  "title": "Public campus reference photographs",
  "scope": "Allowlisted, verified public archive sources only; no private alumni contributions or original embedded metadata.",
  "places": [
    {
      "id": "osm-relation-2451721",
      "name": "Red Building",
      "model_note": "Architectural study; dimensions and some geometry remain inferred."
    },
    {
      "id": "osm-way-151677123",
      "name": "University Library",
      "model_note": "Photo-informed entrance study; frontage and dimensions remain inferred."
    },
    {
      "id": "osm-way-151678266",
      "name": "Ramanujam Computing Centre",
      "model_note": "Photo-informed entrance study; frontage and canopy depth remain inferred."
    },
    {
      "id": "osm-way-152173692",
      "name": "DCSE",
      "model_note": "Mapped mass only. The close-up does not establish the exterior or entrance side."
    },
    {
      "id": "osm-node-6305076548",
      "name": "Main gate & approach",
      "model_note": "Candidate area association. The sign and road photos are not registered to mapped positions."
    }
  ],
  "photos": [
    {
      "id": "ceg-photo-front-pavilion-2012",
      "title": "The red pavilion",
      "source_title": "College of Engineering, Guindy red building.JPG",
      "place_id": "osm-relation-2451721",
      "place_name": "Red Building",
      "association_status": "source_association_not_registration",
      "association_note": "Associated architectural reference; exact facade/camera pose remains unverified.",
      "alt": "Oblique view of the red entrance pavilion, front arch, clock tower and white dome.",
      "author": "Surya Prakash.S.A.",
      "license": "CC BY-SA 3.0",
      "license_url": "https://creativecommons.org/licenses/by-sa/3.0",
      "source_url": "https://commons.wikimedia.org/wiki/File:College_of_Engineering,_Guindy_red_building.JPG",
      "original_source_id": "ceg-photo-front-pavilion-2012",
      "original_sha256": "4217cbb4fa0de4c916adef95c186c1bb744178338792ba8577bba611b7d9392d",
      "capture_date": {
        "status": "reported_unverified",
        "precision": "day_reported",
        "source_reported_day": "2012-01-08",
        "public_exif_reported_day": "2012-01-08",
        "selected_capture_date": null,
        "label": "Reported 2012-01-08",
        "note": "Day reported by the public source; not independently verified. Camera timezone is unknown."
      },
      "registration": {
        "state": "candidate_unaccepted",
        "label": "Registration attempted \u00b7 unaccepted",
        "model_version": "0.2.1",
        "model_sha256": "d855b3175e33897bf033f0548b277709b13b3d71af5ec1554113241f247a00bb",
        "control_inlier_rms_px": 20.62162420052177,
        "holdout_rms_px": 39.88093159102871,
        "note": "An offline trial roughly fits the pavilion but misses the tower clocks. Independent held-out error is 39.9 px; this pose has not been accepted for model changes."
      },
      "vegetation_registration_accepted": false,
      "limitations": [
        "wings obscured; Commons coordinates are unverified map metadata, not a calibrated camera pose"
      ],
      "model_note": "Architectural study; dimensions and some geometry remain inferred.",
      "variants": [
        {
          "url": "./reference-images/ceg-photo-front-pavilion-2012-640.webp",
          "width": 640,
          "height": 480,
          "bytes": 47436,
          "sha256": "e618387f62dccdc94a4d61d96f12a6aadc56ec62812d9ab43260f2b2fd21551b",
          "quality": 78
        },
        {
          "url": "./reference-images/ceg-photo-front-pavilion-2012-1280.webp",
          "width": 1280,
          "height": 960,
          "bytes": 157316,
          "sha256": "d0ab018f4cfac77e188d6d13da4ccb98f1fb6ec7f30b86b91f1b85f7a62286de",
          "quality": 78
        }
      ],
      "image": {
        "url": "./reference-images/ceg-photo-front-pavilion-2012-1280.webp",
        "width": 1280,
        "height": 960,
        "bytes": 157316,
        "sha256": "d0ab018f4cfac77e188d6d13da4ccb98f1fb6ec7f30b86b91f1b85f7a62286de",
        "quality": 78
      },
      "derivative": {
        "changes": "Primary frame selected; EXIF orientation normalized; proportion preserved; downsampled without cropping or upscaling; WebP compression; embedded metadata removed.",
        "format": "WebP",
        "quality": "60\u201378; exact value recorded per variant",
        "encoder": "Pillow 12.1.0",
        "original_dimensions": [
          4000,
          3000
        ],
        "original_container": "MPO",
        "original_frame_count": 2,
        "selected_frame": 0,
        "original_orientation": 1,
        "cropped": false,
        "synthesized": false,
        "license": "CC BY-SA 3.0",
        "license_url": "https://creativecommons.org/licenses/by-sa/3.0"
      }
    },
    {
      "id": "ceg-photo-front-approach-2012",
      "title": "The front approach",
      "source_title": "CEG long shot.JPG",
      "place_id": "osm-relation-2451721",
      "place_name": "Red Building",
      "association_status": "source_association_not_registration",
      "association_note": "Associated architectural reference; exact facade/camera pose remains unverified.",
      "alt": "Wider oblique view of the red pavilion and clock tower from the roadway.",
      "author": "Surya Prakash.S.A.",
      "license": "CC BY-SA 3.0",
      "license_url": "https://creativecommons.org/licenses/by-sa/3.0",
      "source_url": "https://commons.wikimedia.org/wiki/File:CEG_long_shot.JPG",
      "original_source_id": "ceg-photo-front-approach-2012",
      "original_sha256": "b78108150d8714716e7f638eb4ebf4748d3f6572e4e2c8c2183a9943bc2701a2",
      "capture_date": {
        "status": "reported_unverified",
        "precision": "day_reported",
        "source_reported_day": "2012-04-19",
        "public_exif_reported_day": "2012-04-19",
        "selected_capture_date": null,
        "label": "Reported 2012-04-19",
        "note": "Day reported by the public source; not independently verified. Camera timezone is unknown."
      },
      "registration": {
        "state": "unregistered",
        "label": "Photo association only",
        "note": "No accepted camera registration. Architectural details and their model placement remain subject to review."
      },
      "vegetation_registration_accepted": false,
      "limitations": [
        "partial front; vegetation obscures wings"
      ],
      "model_note": "Architectural study; dimensions and some geometry remain inferred.",
      "variants": [
        {
          "url": "./reference-images/ceg-photo-front-approach-2012-640.webp",
          "width": 640,
          "height": 480,
          "bytes": 40088,
          "sha256": "a3aa9e75686d00ac404ec7d391e92e8dfcf1e65b195d5c829a07f98c3cb425bf",
          "quality": 78
        },
        {
          "url": "./reference-images/ceg-photo-front-approach-2012-1280.webp",
          "width": 1280,
          "height": 960,
          "bytes": 135288,
          "sha256": "5cdfa65cb3eea99928eebb8f0bed6b97d8ad04b95b00e3d2c52cd04c0349aa2d",
          "quality": 78
        }
      ],
      "image": {
        "url": "./reference-images/ceg-photo-front-approach-2012-1280.webp",
        "width": 1280,
        "height": 960,
        "bytes": 135288,
        "sha256": "5cdfa65cb3eea99928eebb8f0bed6b97d8ad04b95b00e3d2c52cd04c0349aa2d",
        "quality": 78
      },
      "derivative": {
        "changes": "Primary frame selected; EXIF orientation normalized; proportion preserved; downsampled without cropping or upscaling; WebP compression; embedded metadata removed.",
        "format": "WebP",
        "quality": "60\u201378; exact value recorded per variant",
        "encoder": "Pillow 12.1.0",
        "original_dimensions": [
          4000,
          3000
        ],
        "original_container": "MPO",
        "original_frame_count": 2,
        "selected_frame": 0,
        "original_orientation": 1,
        "cropped": false,
        "synthesized": false,
        "license": "CC BY-SA 3.0",
        "license_url": "https://creativecommons.org/licenses/by-sa/3.0"
      }
    },
    {
      "id": "ceg-photo-arcaded-side-2012",
      "title": "An arcaded side",
      "source_title": "CEG main building one side.JPG",
      "place_id": "osm-relation-2451721",
      "place_name": "Red Building",
      "association_status": "source_association_not_registration",
      "association_note": "Associated architectural reference; exact facade/camera pose remains unverified.",
      "alt": "Two levels of red arcades, pale arch trim and partly obscuring trees.",
      "author": "Surya Prakash.S.A.",
      "license": "CC BY-SA 3.0",
      "license_url": "https://creativecommons.org/licenses/by-sa/3.0",
      "source_url": "https://commons.wikimedia.org/wiki/File:CEG_main_building_one_side.JPG",
      "original_source_id": "ceg-photo-arcaded-side-2012",
      "original_sha256": "f4f1e3749605e02185b38299aa82b7d2d518806bf0206a47b2ee634cfb15f7e8",
      "capture_date": {
        "status": "reported_unverified",
        "precision": "day_reported",
        "source_reported_day": "2012-04-11",
        "public_exif_reported_day": "2012-04-11",
        "selected_capture_date": null,
        "label": "Reported 2012-04-11",
        "note": "Day reported by the public source; not independently verified. Camera timezone is unknown."
      },
      "registration": {
        "state": "unregistered",
        "label": "Photo association only",
        "note": "No accepted camera registration. Architectural details and their model placement remain subject to review."
      },
      "vegetation_registration_accepted": false,
      "limitations": [
        "trees obscure roofline and several bays; exact facade not registered"
      ],
      "model_note": "Architectural study; dimensions and some geometry remain inferred.",
      "variants": [
        {
          "url": "./reference-images/ceg-photo-arcaded-side-2012-640.webp",
          "width": 640,
          "height": 480,
          "bytes": 78600,
          "sha256": "f1801fa1ff93242472a9afb0b0ab0cdc0acd0849555a78d45b5d5045b5172991",
          "quality": 72
        },
        {
          "url": "./reference-images/ceg-photo-arcaded-side-2012-1280.webp",
          "width": 1152,
          "height": 864,
          "bytes": 211232,
          "sha256": "0890311bb7496761a9cb3eb5f5d580e67b96b93ecaeed2d22f062ddf629461bf",
          "quality": 72
        }
      ],
      "image": {
        "url": "./reference-images/ceg-photo-arcaded-side-2012-1280.webp",
        "width": 1152,
        "height": 864,
        "bytes": 211232,
        "sha256": "0890311bb7496761a9cb3eb5f5d580e67b96b93ecaeed2d22f062ddf629461bf",
        "quality": 72
      },
      "derivative": {
        "changes": "Primary frame selected; EXIF orientation normalized; proportion preserved; downsampled without cropping or upscaling; WebP compression; embedded metadata removed.",
        "format": "WebP",
        "quality": "60\u201378; exact value recorded per variant",
        "encoder": "Pillow 12.1.0",
        "original_dimensions": [
          4000,
          3000
        ],
        "original_container": "MPO",
        "original_frame_count": 2,
        "selected_frame": 0,
        "original_orientation": 1,
        "cropped": false,
        "synthesized": false,
        "license": "CC BY-SA 3.0",
        "license_url": "https://creativecommons.org/licenses/by-sa/3.0"
      }
    },
    {
      "id": "ceg-photo-rear-2010",
      "title": "A rear view",
      "source_title": "CEG redbuilding back.jpg",
      "place_id": "osm-relation-2451721",
      "place_name": "Red Building",
      "association_status": "source_association_not_registration",
      "association_note": "Associated architectural reference; exact facade/camera pose remains unverified.",
      "alt": "Low-resolution portrait view of the red building rear and clock tower, as described by its source.",
      "author": "Surya Prakash.S.A.",
      "license": "CC BY-SA 3.0",
      "license_url": "https://creativecommons.org/licenses/by-sa/3.0",
      "source_url": "https://commons.wikimedia.org/wiki/File:CEG_redbuilding_back.jpg",
      "original_source_id": "ceg-photo-rear-2010",
      "original_sha256": "9aa192d91715ac9bf74e2497c7e44bac233bacff69e8a60007e65589afe4788f",
      "capture_date": {
        "status": "reported_unverified",
        "precision": "day_reported",
        "source_reported_day": "2010-09-17",
        "public_exif_reported_day": "2010-09-17",
        "selected_capture_date": null,
        "label": "Reported 2010-09-17",
        "note": "Day reported by the public source; not independently verified. Camera timezone is unknown."
      },
      "registration": {
        "state": "unregistered",
        "label": "Photo association only",
        "note": "No accepted camera registration. Architectural details and their model placement remain subject to review."
      },
      "vegetation_registration_accepted": false,
      "limitations": [
        "low resolution; exact camera pose and metric scale unknown"
      ],
      "model_note": "Architectural study; dimensions and some geometry remain inferred.",
      "variants": [
        {
          "url": "./reference-images/ceg-photo-rear-2010-640.webp",
          "width": 480,
          "height": 640,
          "bytes": 14882,
          "sha256": "ea10872380357744bbb0b34f93ba01bc9ae5396437dfea14935e3d5bf535f92c",
          "quality": 78
        }
      ],
      "image": {
        "url": "./reference-images/ceg-photo-rear-2010-640.webp",
        "width": 480,
        "height": 640,
        "bytes": 14882,
        "sha256": "ea10872380357744bbb0b34f93ba01bc9ae5396437dfea14935e3d5bf535f92c",
        "quality": 78
      },
      "derivative": {
        "changes": "Primary frame selected; EXIF orientation normalized; proportion preserved; downsampled without cropping or upscaling; WebP compression; embedded metadata removed.",
        "format": "WebP",
        "quality": "60\u201378; exact value recorded per variant",
        "encoder": "Pillow 12.1.0",
        "original_dimensions": [
          480,
          640
        ],
        "original_container": "JPEG",
        "original_frame_count": 1,
        "selected_frame": 0,
        "original_orientation": 1,
        "cropped": false,
        "synthesized": false,
        "license": "CC BY-SA 3.0",
        "license_url": "https://creativecommons.org/licenses/by-sa/3.0"
      }
    },
    {
      "id": "ceg-photo-triple-arcade-2013",
      "title": "A secondary facade detail",
      "source_title": "Anna University Main Building.jpg",
      "place_id": "osm-relation-2451721",
      "place_name": "Red Building",
      "association_status": "source_association_not_registration",
      "association_note": "Associated architectural reference; exact facade/camera pose remains unverified.",
      "alt": "Upper red facade with three arches and a triangular pediment; this is not the clock entrance.",
      "author": "Thamizhpparithi Maari",
      "license": "CC BY-SA 4.0",
      "license_url": "https://creativecommons.org/licenses/by-sa/4.0",
      "source_url": "https://commons.wikimedia.org/wiki/File:Anna_University_Main_Building.jpg",
      "original_source_id": "ceg-photo-triple-arcade-2013",
      "original_sha256": "2b72a6c4f07858996247a3be4c5e55b0ae9982819502ad86020fac9a416a0c90",
      "capture_date": {
        "status": "reported_unverified",
        "precision": "day_reported",
        "source_reported_day": "2013-09-29",
        "public_exif_reported_day": "2013-09-29",
        "selected_capture_date": null,
        "label": "Reported 2013-09-29",
        "note": "Day reported by the public source; not independently verified. Camera timezone is unknown."
      },
      "registration": {
        "state": "unregistered",
        "label": "Photo association only",
        "note": "No accepted camera registration. Architectural details and their model placement remain subject to review."
      },
      "vegetation_registration_accepted": false,
      "limitations": [
        "ground floor cropped; do not conflate this bay with clock entrance"
      ],
      "model_note": "Architectural study; dimensions and some geometry remain inferred.",
      "variants": [
        {
          "url": "./reference-images/ceg-photo-triple-arcade-2013-640.webp",
          "width": 640,
          "height": 427,
          "bytes": 25632,
          "sha256": "fb39cc74e7ba12319632002c650cbfa705794527010e0ce16d4a295ccdee4546",
          "quality": 78
        },
        {
          "url": "./reference-images/ceg-photo-triple-arcade-2013-1280.webp",
          "width": 1280,
          "height": 853,
          "bytes": 78606,
          "sha256": "6debe29728050a4f0f6dfc099a4c933cc174e12ef8dc5ae8e12dd716419c6344",
          "quality": 78
        }
      ],
      "image": {
        "url": "./reference-images/ceg-photo-triple-arcade-2013-1280.webp",
        "width": 1280,
        "height": 853,
        "bytes": 78606,
        "sha256": "6debe29728050a4f0f6dfc099a4c933cc174e12ef8dc5ae8e12dd716419c6344",
        "quality": 78
      },
      "derivative": {
        "changes": "Primary frame selected; EXIF orientation normalized; proportion preserved; downsampled without cropping or upscaling; WebP compression; embedded metadata removed.",
        "format": "WebP",
        "quality": "60\u201378; exact value recorded per variant",
        "encoder": "Pillow 12.1.0",
        "original_dimensions": [
          5184,
          3456
        ],
        "original_container": "JPEG",
        "original_frame_count": 1,
        "selected_frame": 0,
        "original_orientation": 1,
        "cropped": false,
        "synthesized": false,
        "license": "CC BY-SA 4.0",
        "license_url": "https://creativecommons.org/licenses/by-sa/4.0"
      }
    },
    {
      "id": "ceg-campus-library-2013",
      "title": "The library entrance",
      "source_title": "Anna University Library.JPG",
      "place_id": "osm-way-151677123",
      "place_name": "University Library",
      "association_status": "source_association_not_registration",
      "association_note": "Commons title/description and corresponding named OSM feature; not a calibrated photo registration",
      "alt": "Cream library frontage, projecting rectangular window frames and a broad entrance canopy.",
      "author": "Surya Prakash.S.A.",
      "license": "CC BY-SA 3.0",
      "license_url": "https://creativecommons.org/licenses/by-sa/3.0",
      "source_url": "https://commons.wikimedia.org/wiki/File:Anna_University_Library.JPG",
      "original_source_id": "ceg-campus-library-2013",
      "original_sha256": "06a2368a79d4f6d0bb6e72124e09828bad86b967c9de192f730368c0ed726e6c",
      "capture_date": {
        "status": "conflict",
        "precision": "unresolved",
        "source_reported_day": "2013-03-11",
        "public_exif_reported_day": "2012-07-29",
        "selected_capture_date": null,
        "label": "Capture date conflict",
        "note": "Source page reports 2013-03-11; public EXIF reports 2012-07-29. Neither has been selected as the capture date."
      },
      "registration": {
        "state": "unregistered",
        "label": "Photo association only",
        "note": "No accepted camera registration. Architectural details and their model placement remain subject to review."
      },
      "vegetation_registration_accepted": false,
      "limitations": [
        "Front is partly cropped and obscured by foliage",
        "Rear/roof/complete side elevations absent",
        "No measured height, canopy depth, doorway scale or calibrated pose",
        "Photographed ramp existence does not verify present-day accessible route"
      ],
      "model_note": "Photo-informed entrance study; frontage and dimensions remain inferred.",
      "variants": [
        {
          "url": "./reference-images/ceg-campus-library-2013-640.webp",
          "width": 640,
          "height": 480,
          "bytes": 35796,
          "sha256": "3e961f7a084764b586a49aef11855167881529e51100f861deca4ab95880f386",
          "quality": 78
        },
        {
          "url": "./reference-images/ceg-campus-library-2013-1280.webp",
          "width": 1280,
          "height": 960,
          "bytes": 114528,
          "sha256": "9d97f0018a74b15754caefff8ffb4f174fc8940c7018e39edb2559e2094acb95",
          "quality": 78
        }
      ],
      "image": {
        "url": "./reference-images/ceg-campus-library-2013-1280.webp",
        "width": 1280,
        "height": 960,
        "bytes": 114528,
        "sha256": "9d97f0018a74b15754caefff8ffb4f174fc8940c7018e39edb2559e2094acb95",
        "quality": 78
      },
      "derivative": {
        "changes": "Primary frame selected; EXIF orientation normalized; proportion preserved; downsampled without cropping or upscaling; WebP compression; embedded metadata removed.",
        "format": "WebP",
        "quality": "60\u201378; exact value recorded per variant",
        "encoder": "Pillow 12.1.0",
        "original_dimensions": [
          4000,
          3000
        ],
        "original_container": "JPEG",
        "original_frame_count": 1,
        "selected_frame": 0,
        "original_orientation": 1,
        "cropped": false,
        "synthesized": false,
        "license": "CC BY-SA 3.0",
        "license_url": "https://creativecommons.org/licenses/by-sa/3.0"
      }
    },
    {
      "id": "ceg-campus-rcc-2013",
      "title": "The computing centre entrance",
      "source_title": "Ramanujam Computing Centre.JPG",
      "place_id": "osm-way-151678266",
      "place_name": "Ramanujam Computing Centre",
      "association_status": "source_association_not_registration",
      "association_note": "Commons title/description and corresponding named OSM feature; not a calibrated photo registration",
      "alt": "Pale blue and cream RCC frontage with two tall piers and an entrance canopy.",
      "author": "Surya Prakash.S.A.",
      "license": "CC BY-SA 3.0",
      "license_url": "https://creativecommons.org/licenses/by-sa/3.0",
      "source_url": "https://commons.wikimedia.org/wiki/File:Ramanujam_Computing_Centre.JPG",
      "original_source_id": "ceg-campus-rcc-2013",
      "original_sha256": "8bd08c9ac8a1518a4d800f2747c65ced0a5d890e71a6589f79b0373755f868d3",
      "capture_date": {
        "status": "reported_unverified",
        "precision": "day_reported",
        "source_reported_day": "2013-03-11",
        "public_exif_reported_day": "2013-03-11",
        "selected_capture_date": null,
        "label": "Reported 2013-03-11",
        "note": "Day reported by the public source; not independently verified. Camera timezone is unknown."
      },
      "registration": {
        "state": "unregistered",
        "label": "Photo association only",
        "note": "No accepted camera registration. Architectural details and their model placement remain subject to review."
      },
      "vegetation_registration_accepted": false,
      "limitations": [
        "Vehicles obscure lower facade",
        "Strong exposure/foliage shadows cannot become permanent wall texture",
        "Unknown side/rear facades and roof geometry",
        "Photos alone do not identify entrance orientation on footprint"
      ],
      "model_note": "Photo-informed entrance study; frontage and canopy depth remain inferred.",
      "variants": [
        {
          "url": "./reference-images/ceg-campus-rcc-2013-640.webp",
          "width": 640,
          "height": 480,
          "bytes": 39048,
          "sha256": "33f8fd0694e4500545ab7a104390458b9b4a2cdd162eef12d8eb6a8608af402d",
          "quality": 78
        },
        {
          "url": "./reference-images/ceg-campus-rcc-2013-1280.webp",
          "width": 1280,
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    },
    {
      "id": "ceg-campus-rcc-context-undated",
      "title": "A second RCC view",
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        "Cannot infer overall building height or exterior silhouette",
        "No campus coordinate or identified door on footprint",
        "No corridor depth or room layout"
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      "model_note": "Mapped mass only. The close-up does not establish the exterior or entrance side.",
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    },
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        "note": "No accepted camera registration. Architectural details and their model placement remain subject to review."
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        "Small gatehouse partly occluded",
        "No measured sign/fence height",
        "Fine emblem and some Tamil lettering require separate legibility review"
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      "model_note": "Candidate area association. The sign and road photos are not registered to mapped positions.",
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    },
    {
      "id": "ceg-campus-entrance-road-2016",
      "title": "An entrance road",
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      "place_id": "osm-node-6305076548",
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        "No surveyed widths or curb heights",
        "Foliage obscures many potential architectural tie points",
        "No legible pavement markings established"
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