{"derived":{"retrieved":"2026-10-14","scope":"All160 catalogue records,156 individual island names and4 group names. Not a census of all physical Hong Kong islands.","methods":{"shapeMetrics":"Spherical polygon-area calculation on the existing1:50,000 generalized LandsD sea-fill-derived land ring; not an official area, tide-dependent size or survey. East-west and north-south measures are axis-aligned bounding-box spans, not walk distances or maximal island length. Three significant figures retained for audit, UI should round to two.","namedFeatures":"Official LandsD name points whose positions fall strictly inside the matched generalized outline. Name points are not centroids or entrances; bays may be represented offshore and therefore absent from this join.","containedPlaces":"Current app catalogue points inside generalized outline. Excludes countryPark and marinePark reference points, which do not establish protection boundaries. Missing/empty does not establish no facilities. A pier may sit outside the land outline.","nearestNamedIslands":"Three closest other individual-island reference points, irrespective of water/landing/connectivity. Distances use haversine on WGS84 coordinates with mean Earth radius6371008.8m. Never label this walking distance or route."},"rights":{"status":"commercial-reuse-with-attribution","termsUrl":"https://portal.csdi.gov.hk/csdi-webpage/doc/TNC","attribution":"Data © Hong Kong SAR Government, Lands Department and relevant facility publishers; CSDI Portal.","appliesTo":"Underlying CSDI data only; no externally linked editorial prose or photos copied."},"sources":[{"id":"landsd-geographic-names","url":"https://data.gov.hk/en-data/dataset/hk-landsd-openmap-landsd-geographic-name","file":"data/maritime/islands/geonames-points.json","sha256":"156ba14a179f8e9454616cb2035877cf64824bb5c31cd4c8e86316ec84e74952"},{"id":"landsd-topographic-sea-fill","url":"https://portal.csdi.gov.hk/csdi-webpage/dataset/landsd_rcd_1637221775627_85634","file":"data/maritime/islands/islands.json","sha256":"4bd2f0f7b08e46a0c231a0e5f8c94181255d9a8056313322a61281450e85d92a"},{"id":"app-city-catalogue","file":"public/assets/city-places.json","perRecordAttribution":true,"sha256":"138914cee63510f6efe60b624445087f9abd55601c2110d5b756415335258afc"}],"counts":{"records":160,"shapes":144,"withNamedFeatures":29,"namedFeatures":430,"withContainedPlaces":17,"containedPlaces":285}},"geology":{"retrieved":"2026-10-14","sourceUrl":"https://portal.csdi.gov.hk/csdi-webpage/dataset/cedd_rcd_1636520962284_7237","queryUrl":"https://portal.csdi.gov.hk/server/rest/services/common/cedd_rcd_1636520962284_7237/MapServer/5/query?where=1%3D1&outFields=OBJECTID%2CGeol_Type&returnGeometry=true&outSR=4326&f=geojson","queryResponseSHA256":"630e90b2097d85f763c66a3b1457e197e976532e16781278c64f3f4e785b7a66","queryResponseBytes":2010676,"sourceFeatures":891,"sourceMapYear":2000,"nominalScale":100000,"method":"Point-in-polygon against current gazetteer representative name points, using whole source geology collection. Not the dominant geology of an island; a single reference point may differ from coast or other parts. Boundary/absent matches remain explicit.","rights":{"termsUrl":"https://portal.csdi.gov.hk/csdi-webpage/doc/TNC","status":"commercial-reuse-with-attribution","attribution":"Geological map © Hong Kong SAR Government, CEDD / GEO; CSDI Portal."}},"groups":{"retrieved":"2026-10-14","sourceUrl":"https://www.ginfo.cedd.gov.hk/geoopendata/Data/GeologicalMap/GeoMap100k_Dict.pdf","sourceMapYear":2000,"termsUrl":"https://www.ginfo.cedd.gov.hk/geoopendata/eng/GeologicalMap.aspx","rights":"GEO Data Portal allows free commercial/non-commercial data reproduction with Government and GEO Data Portal attribution.","interpretation":"Harbour broad educational grouping of the code descriptions in the official data dictionary. Original code remains authoritative; local rock variation is not represented.","groups":[{"id":"tuff","en":"Volcanic tuff","zh":"火山凝灰岩","codes":["Jts","Kra","Kkh","Jtm","Krl","Krd","Jty","Krc"]},{"id":"volcanic-mixture","en":"Mixed volcanic rocks","zh":"混合火山岩","codes":["Jlu","Krn"]},{"id":"lava","en":"Volcanic lava","zh":"火山熔岩","codes":["Jtl","Kkw","Krp"]},{"id":"granite","en":"Granite","zh":"花崗岩","codes":["Klp","Jmc","Jml","Klb","Jms","Kll","Kcc","Jma"]},{"id":"quartz-monzonite","en":"Quartz monzonite","zh":"石英二長岩","codes":["Kcl","Kld"]},{"id":"granodiorite","en":"Granodiorite","zh":"花崗閃長岩","codes":["Jmt"]},{"id":"dyke","en":"Intrusive dyke rocks","zh":"侵入岩牆","codes":["Jko","Jkd"]},{"id":"sedimentary","en":"Sedimentary rocks","zh":"沉積岩","codes":["Kk","Pt","Krm","Kp","Ep","Ki","Db"]},{"id":"metasedimentary","en":"Metamorphosed sedimentary rocks","zh":"變質沉積岩","codes":["Csl"]},{"id":"superficial","en":"Superficial deposits","zh":"表土沉積物","codes":["Q"]}]},"heritage":{"retrieved":"2026-10-14","sourceUrl":"https://portal.csdi.gov.hk/csdi-webpage/dataset/devb_wb_rcd_1639040299687_46105","sourceFile":"data/city/raw-leisure/heritage-raw.geojson","sourceFileSHA256":"77de5afab3b8b3e1887db99560319b2026c1ef704087116037fd0509ebd8c007","sourceLayerName":"DM_20260130_150858","sourceFeatures":174,"sourceFeatureScope":"174 polygon features; not asserted to equal174 distinct monuments.","rights":{"status":"commercial-reuse-with-attribution","termsUrl":"https://portal.csdi.gov.hk/csdi-webpage/doc/TNC","attribution":"Declared monument data © Hong Kong SAR Government, Development Bureau / Antiquities and Monuments Office; CSDI Portal.","excluded":"No AMO editorial descriptions, images, maps or virtual tours copied. Separate AMO website material has restrictive reuse terms."}},"editorialSources":["https://www.afcd.gov.hk/english/country/cou_vis/cou_vis_cou/cou_vis_cou_kt/cou_vis_cou_kt.html","https://www.afcd.gov.hk/english/country/cou_vis/cou_vis_mar/cou_vis_mar_des/cou_vis_mar_des_tun.html","https://www.afcd.gov.hk/english/country/cou_vis/cou_vis_mar/cou_vis_mar_des/cou_vis_mar_des_sha.html","https://www.afcd.gov.hk/english/country/cou_vis/cou_vis_mar/cou_vis_mar_des/cou_vis_mar_des_sl.html","https://portal.csdi.gov.hk/csdi-webpage/dataset/cedd_rcd_1636520962284_7237"],"generated":"2026-10-14","counts":{"records":160,"shapes":144,"withNamedFeatures":29,"namedFeatures":430,"withContainedPlaces":17,"containedPlaces":285,"geology":140,"heritage":16},"delivery":"One island detail file on selection. Coordinates are source name points, not entrances."}