{ "version": "1.12", "date": "2026-10-16", "status": "visual model, not field validated", "scope": "Local building, bridge and inventory-based approximate crown shadows. Trees enabled by default in shade mode; city inventory or LiDAR pilot, never stacked.", "engine": { "name": "ArcGIS Maps SDK for JavaScript", "pinned_version": "4.33", "instant": "SceneView SunLighting.directShadowsEnabled", "duration": "ShadowCastViewModel, visualizationType duration, continuous", "documentation": "https://developers.arcgis.com/javascript/latest/references/core/widgets/ShadowCast/", "pinned_implementation": "https://js.arcgis.com/4.33/esri/widgets/ShadowCast/ShadowCastViewModel.js" }, "time": { "available_dates": [ "2026-06-01", "2026-08-31" ], "instant_hour_range": [ 8, 18 ], "instant_step_minutes": 15, "duration_hours": [ 12, 17 ], "timezone": "Europe/Zagreb", "explicit_summer_offset_hours": 2, "browser_timezone_independent": true, "duration_readout_rounding_minutes": 15, "rounding_is_accuracy_claim": false }, "sources": [ { "name": "Grad Zagreb LoD2 buildings", "url": "https://services-eu1.arcgis.com/6BlpNMAIwm2EjKih/arcgis/rest/services/ZG3D_LOD2_2025_atributi/SceneServer/layers/0", "geometry": "3D meshes", "used_for_shadow": true, "date": "Source service name 2025 is not a survey date for every object; use per-building Godina_izv and Izvor attributes in main map." }, { "name": "Grad Zagreb bridges and overpasses", "services": [ "https://services-eu1.arcgis.com/6BlpNMAIwm2EjKih/arcgis/rest/services/Mostovi_2025_G1/SceneServer/layers/0", "https://services-eu1.arcgis.com/6BlpNMAIwm2EjKih/arcgis/rest/services/Mostovi_2025_G2/SceneServer/layers/0", "https://services-eu1.arcgis.com/6BlpNMAIwm2EjKih/arcgis/rest/services/Nadvoznjaci_2025_G1/SceneServer/layers/0", "https://services-eu1.arcgis.com/6BlpNMAIwm2EjKih/arcgis/rest/services/Nadvoznjaci_2025_G2/SceneServer/layers/0" ], "geometry": "3D meshes", "used_for_shadow": true }, { "name": "Grad Zagreb tree inventory", "url": "https://services-eu1.arcgis.com/6BlpNMAIwm2EjKih/arcgis/rest/services/ZG3D_stabla_2025_Z/FeatureServer/0", "geometry": "source points; modelled 3D geometry", "used_for_shadow": true, "record_count_audited_2026_10_10": 162676, "height": "Class representatives in metres: up to 5 -> 3; 6–10 -> 8; 11–15 -> 13; 16–20 -> 18; 21–25 -> 23; above 25 -> 30 (assumed open class).", "crown": "Class diameter representatives: up to 5 -> 3; 6–10 -> 8; 11–15 -> 13; above 15 -> 18 (assumed open class). Not measured outlines.", "completeness": "not confirmed citywide", "survey_date": "not established per record", "rendering": "Opaque ellipsoid crown and cylinder trunk, metres, relative to terrain", "included_count": 162210 }, { "name": "Grad Zagreb Trešnjevka north LiDAR extraction pilot", "url": "https://services-eu1.arcgis.com/6BlpNMAIwm2EjKih/arcgis/rest/services/VEGE_extract_TresnjevkaSj_Z/FeatureServer/0", "geometry": "source points; modelled 3D geometry", "used_for_shadow": true, "record_count_audited_2026_10_10": 10362, "height": "height = MAX_ - BASEELEV in inspected samples, metres", "attributes": "Width and AREA are supplied extraction attributes. No crown polygons or detection accuracy are inferred.", "source_description": "DGU multisensor survey, vegetation class 5; tile acquisition date must be verified.", "rendering": "Opaque ellipsoid crown and cylinder trunk, metres, relative to terrain", "included_count": 10355 } ], "spatial_support": { "local_max_scale_denominator": 16000, "fixed_ground_resolution_m": null, "explanation": "View-dependent loaded 3D objects and screen-space shadow rendering; no claim of a uniform raster or surveyed ground precision.", "canopy_loading": "1000 Web Mercator metre tiles; viewport plus 400 Web Mercator metre buffer; at most 6000 trees per local view, otherwise asks for a closer view without truncation." }, "limitations": [ "Terrain receives shadows but does not cast shadows in this SDK model.", "Approximate opaque crowns cast shade; leaf gaps/transmission and actual crown outlines are not modelled. Records are not a complete citywide canopy mask; separate canopy coverage above asphalt has not been computed.", "Clouds, atmospheric diffuse radiation, crown seasonality and current construction changes are not modelled.", "Missing, simplified or unloaded geometry can underestimate shade; rendering depends on camera, hardware and loaded objects.", "Duration readout is on the selected visible surface. A roof readout is not a sidewalk readout.", "No confirmed sidewalk/asphalt polygons, no percentage of sidewalk shade and no claim of canopy above asphalt.", "The optional analysis does not modify LST/NDVI values, does not fill LST gaps and does not estimate Tair, MRT, UTCI or cooling effect.", "No field validation or visual browser/WebGL QA was available for this release." ], "display": "Neutral Esri Light Gray basemap while active, avoiding orthophoto baked shadows. Previous basemap, lighting and building visibility restored on exit.", "handover": { "available_now": [ "ERA5/VPD climate context 2016–2025", "local visual shadows from buildings, bridges and approximate inventory crowns", "alternative Trešnjevka LiDAR pilot crown geometry" ], "additional_inputs": [ "Classified LAZ or co-registered DSM/DTM and ortho for canopy pilot", "Survey dates, density, class accuracy and leaf condition", "Ground-surface and sidewalk polygons, including material beneath crowns", "NIR/SWIR scenes with QA for NDMI and common-date VPD/LST comparisons", "Street and morphology boundaries for actual urban blocks" ], "later": [ "Validated canopy extent and height, then tree segmentation", "Shadow intersection with verified pedestrian surfaces", "Common-date multivariate block assessment with documented uncertainty", "Field-supported human thermal comfort and intervention evaluation" ] }, "canopy_manifest": "../canopy/index.json", "canopy_base": "Assumed min(5 m, 25% of tree height). Unknown species architecture and crown-base variation." }