better metadata processing
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randogoth
parent
040f592ca2
commit
d58008caef
3 changed files with 327 additions and 11 deletions
287
assets/map.json
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287
assets/map.json
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@ -0,0 +1,287 @@
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{
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"abandoned": {
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"historic": "ruins",
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"landuse": "abandoned",
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"railway": [
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"abandoned",
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"disused"
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]
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},
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"airfield": {
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"aeroway": true
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},
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"archeologic": {
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"historic": "archaeological_site"
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},
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"beach": {
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"natural": [
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"beach",
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"coastline",
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"shingle",
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"shoal"
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]
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},
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"border": {
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"boundary": [
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"border_zone",
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"disputed"
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]
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},
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"bush": {
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"natural": [
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"scrub",
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"shrubbery"
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]
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},
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"cemetery": {
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"landuse": [
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"cemetery",
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"grave_yard",
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"graveyard"
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]
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},
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"commercial": {
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"landuse": [
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"commercial",
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"retail"
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]
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},
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"construction": {
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"landuse": [
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"brownfield",
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"construction"
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],
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"railway": "construction"
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},
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"farmland": {
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"landuse": [
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"agricultural",
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"agriculture",
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"animal_keeping",
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"farmland",
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"farmyard",
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"greenhouse_horticulture",
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"orchard",
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"paddy",
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"plant_nursery",
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"vineyard"
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],
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"place": [
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"farm",
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"plot"
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]
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},
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"forest": {
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"boundary": "forest",
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"landuse": [
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"forest",
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"forestry",
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"logging"
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],
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"natural": [
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"tree_row",
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"wood"
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],
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"place": "woodland"
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},
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"fort": {
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"historic": [
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"castle_crush",
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"castle_wall",
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"castle",
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"fort"
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]
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},
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"grassland": {
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"landuse": [
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"clearing",
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"grass",
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"grassland",
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"green",
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"greenfield",
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"meadow",
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"pasture"
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],
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"natural": [
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"grassland",
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"heath",
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"tundra"
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]
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},
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"greenery": {
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"landuse": "greenery"
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},
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"hazard": {
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"boundary": "hazard",
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"geological": "sinkhole"
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},
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"history": {
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"historic": [
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"aqueduct",
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"battlefield",
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"citywalls",
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"yes"
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]
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},
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"industrial": {
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"landuse": "industrial",
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"power": "plant"
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},
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"island": {
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"place": [
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"island",
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"islet"
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]
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},
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"landfill": {
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"landuse": "landfill"
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},
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"lithic": {
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"geological": [
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"columnar_jointing",
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"dyke",
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"glacial_erratic",
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"hoodoo",
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"inselberg",
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"limestone_pavement",
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"monocline",
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"moraine",
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"outcrop",
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"pingo",
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"tor"
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],
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"landuse": "quarry",
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"natural": [
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"bare_rock",
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"scree",
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"stone"
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]
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},
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"meteor": {
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"geological": "meteor_crater"
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},
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"military": {
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"landuse": "military",
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"military": [
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"airfield",
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"barracks",
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"base",
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"bunker",
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"danger_area",
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"nuclear_explosion_site",
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"range",
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"training_area"
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]
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},
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"park": {
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"boundary": "national_park",
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"landuse": [
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"park",
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"village_green"
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],
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"leisure": [
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"dog_park",
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"garden",
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"park"
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]
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},
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"protected": {
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"boundary": [
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"aboriginal_lands",
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"protected_area"
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],
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"landuse": "conservation",
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"leisure": "nature_reserve"
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},
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"railway": {
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"landuse": "railway",
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"railway": "rail"
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},
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"recreation": {
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"landuse": [
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"playground",
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"recreation_ground",
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"recreation"
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],
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"leisure": [
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"miniature_gold",
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"playground",
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"water_park"
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]
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},
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"residential": {
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"landuse": [
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"allotments",
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"residential"
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]
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},
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"spiritual": {
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"historic": [
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"church",
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"mosque",
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"temple"
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],
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"landuse": [
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"churchyard",
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"religious"
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]
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},
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"sports": {
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"landuse": "winter_sports",
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"sport": [
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"bmx",
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"golf",
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"paintball",
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"skateboard",
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"skiing",
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"speedway",
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"tennis"
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]
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},
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"tourism": {
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"tourism": [
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"attraction",
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"yes"
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]
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},
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"volcano": {
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"geological": [
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"volcanic_caldera_rim",
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"volcanic_lava_field",
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"volcanic_vent"
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],
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"natural": "volcano"
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},
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"wasteland": {
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"landuse": "wasteland",
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"natural": [
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"desert",
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"mud",
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"sand"
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]
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},
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"water": {
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"landuse": [
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"basin",
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"reservoir",
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"salt_pond"
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],
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"natural": [
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"strait",
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"water",
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"wetland"
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],
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"place": [
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"ocean",
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"sea"
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],
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"water": true,
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"waterway": [
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"river",
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"stream",
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"tidal_channel",
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"canal",
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"fairway"
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]
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}
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}
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@ -6,16 +6,19 @@ import 'package:turf/turf.dart';
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import 'package:path_provider/path_provider.dart';
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import 'package:shared_preferences/shared_preferences.dart';
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import 'package:flutter/foundation.dart' show kIsWeb;
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import 'package:flutter/services.dart' show rootBundle;
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class RugReefer {
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final String apiUrl;
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final bool enableCacheExpiration;
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final Duration cacheExpirationDuration;
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final http.Client httpClient;
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final String categoryMap;
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Directory? cacheDir;
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RugReefer({
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required this.apiUrl,
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required this.categoryMap,
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this.enableCacheExpiration = false,
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this.cacheExpirationDuration = const Duration(days: 14),
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http.Client? client,
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@ -34,9 +37,13 @@ class RugReefer {
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Future<List<Map<String, dynamic>>> lookup(double latitude, double longitude, {double distanceThreshold = 10.0}) async {
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final String geohash = GeoHasher().encode(latitude, longitude, precision: 4);
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return kIsWeb
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final jsonMap = await loadJsonFromAssets(categoryMap);
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List<Map<String, dynamic>> rawData = kIsWeb
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? await _lookupWeb(geohash, latitude, longitude, distanceThreshold)
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: await _lookupFile(geohash, latitude, longitude, distanceThreshold);
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return _processMetadata(rawData, jsonMap, latitude, longitude, distanceThreshold);
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}
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Future<List<Map<String, dynamic>>> _lookupFile(String geohash, double latitude, double longitude, double distanceThreshold) async {
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@ -47,7 +54,7 @@ class RugReefer {
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await _updateLastAccessTime(geohash);
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}
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final String geoJsonStr = utf8.decode(GZipCodec().decode(cacheFile.readAsBytesSync()));
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return _findMetadata(latitude, longitude, jsonDecode(geoJsonStr), distanceThreshold);
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return jsonDecode(geoJsonStr)['features'];
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}
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Future<List<Map<String, dynamic>>> _lookupWeb(String geohash, double latitude, double longitude, double distanceThreshold) async {
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@ -59,12 +66,12 @@ class RugReefer {
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final geoJsonStr = utf8.decode(response.bodyBytes);
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await prefs.setString('geojson_$geohash', geoJsonStr);
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await _updateLastAccessTime(geohash);
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return _findMetadata(latitude, longitude, jsonDecode(geoJsonStr), distanceThreshold);
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return jsonDecode(geoJsonStr)['features'];
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}
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throw Exception('Failed to download GeoJSON for geohash: $geohash');
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}
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await _updateLastAccessTime(geohash);
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return _findMetadata(latitude, longitude, jsonDecode(cachedGeoJson), distanceThreshold);
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return jsonDecode(cachedGeoJson)['features'];
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}
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Future<void> _downloadGeoJson(String geohash, File cacheFile) async {
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@ -102,12 +109,20 @@ class RugReefer {
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}
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}
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List<Map<String, dynamic>> _findMetadata(double latitude, double longitude, Map<String, dynamic> geoJson, double distanceThreshold) {
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Future<Map<String, dynamic>> loadJsonFromAssets(String assetPath) async {
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final jsonString = await rootBundle.loadString(assetPath);
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return jsonDecode(jsonString);
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}
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List<Map<String, dynamic>> _processMetadata(List<Map<String, dynamic>> features, Map<String, dynamic> jsonMap, double latitude, double longitude, double distanceThreshold) {
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final Position point = Position(longitude, latitude);
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final List<Map<String, dynamic>> results = [];
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for (var feature in geoJson['features']) {
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Map<String, Map<String, List<String>>> groupedObjects = {};
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for (var feature in features) {
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final geometry = feature['geometry'];
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final metadata = Map<String, dynamic>.from(feature['properties']['tags'] ?? {})..removeWhere((_, v) => v == null);
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String? mainKey;
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switch (geometry['type']) {
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case 'Polygon':
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final polygon = Polygon(
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@ -117,7 +132,7 @@ class RugReefer {
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.toList())
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.toList(),
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);
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if (booleanPointInPolygon(point, polygon)) results.add({"type": "polygon", ...metadata});
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if (booleanPointInPolygon(point, polygon)) mainKey = 'in';
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break;
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case 'LineString':
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final line = LineString(
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@ -125,11 +140,26 @@ class RugReefer {
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.map((p) => Position(p[0].toDouble(), p[1].toDouble()))
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.toList(),
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);
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if (_isPointNearLine(Point(coordinates: point), line, distanceThreshold)) results.add({"type": "line", ...metadata});
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if (_isPointNearLine(Point(coordinates: point), line, distanceThreshold)) mainKey = 'by';
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break;
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}
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if (mainKey == null) continue;
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groupedObjects.putIfAbsent(mainKey, () => {});
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for (var key in metadata.keys) {
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for (var category in jsonMap.keys) {
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var categoryMap = jsonMap[category];
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if (categoryMap is Map && categoryMap.containsKey(key)) {
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var rule = categoryMap[key];
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if (rule is String || (rule is List && rule.contains(metadata[key])) || rule == true) {
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groupedObjects[mainKey]!.putIfAbsent(category, () => []);
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groupedObjects[mainKey]![category]!.add(metadata[key]);
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}
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}
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}
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}
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}
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return results;
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return groupedObjects.entries.map((entry) => {entry.key: entry.value}).toList();
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}
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bool _isPointNearLine(Point point, LineString line, double distanceThreshold) {
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@ -10,7 +10,6 @@ environment:
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dependencies:
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dart_geohash: ^2.1.0
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http: ^1.3.0
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latlong2: ^0.9.1
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path_provider: ^2.1.5
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shared_preferences: ^2.5.2
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turf: ^0.0.10
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