从 json 文件中获取所有多边形
Gets all polygons from a json file
我有一个 json 文件，其中包含几个多边形的坐标。我想要做的是自动获取坐标，但按多边形分别保存它们。在我目前使用的文件中，我有 2 个多边形：
{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[
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这里开始第二个多边形
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]}}
另存为poly1.json
有没有什么办法可以单独保存，我希望最后的结果是这样的：
array = [coordinates of polygon 1], [coordinates of polygon 2] 如果使用比示例更多的多边形，它们将自动保存而无需更改代码，array = [coordinates of polygon 1], [多边形 2 的坐标]、[多边形 3 的坐标] 等等。
到目前为止我有这个：
require 'rubygems'
require 'json'
file = File.read('poly1.json')
coordinates = JSON.parse(file)
string=coordinates.to_s[0...-4]
path = string.split"["
path.shift()
path.shift()
path.shift()
这只是从路径中的两个多边形获取所有坐标。但我想要的是将多边形 1 坐标与多边形 2 坐标分开，在我使用 3 多边形文件的情况下，无需手动操作即可将其分开。
抱歉我的英语不好，如果您需要其他东西，请在评论中提出。
你的例子太大了，不容易理解。但是从文件开头的关键结构
{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[ [[[0.03990083369766674,41.65117297365802], ...
看起来 coordinates 是嵌套在 geometry 键下方的简单散列。因此我会尝试以下操作：
require 'rubygems'
require 'json'
file = File.read('poly1.json')
data = JSON.parse(file)
coordinates = data["geometry"]["coordinates"]
coordinates[0] #=> should now return the first coordonate from the array
我有一个 json 文件，其中包含几个多边形的坐标。我想要做的是自动获取坐标，但按多边形分别保存它们。在我目前使用的文件中，我有 2 个多边形：
{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[ [[[0.03990083369766674,41.65117297365802],[0.03986585098450487,41.6511738730363],[0.0398193071116094,41.65118861345209],[0.03978640897789055,41.651211227828185],[0.039785212880236676,41.65121205009294],[0.039761889395081365,41.65124414021116],[0.03975127958141444,41.65127097990489],[0.03973309671778063,41.65131697476312],[0.039706482497244025,41.651425988964064],[0.03969658765996025,41.65146652049745],[0.039683272167788275,41.65150292059053],[0.03968380609505212,41.65151410540278],[0.03968455879000179,41.6515298809837],[0.03969278143750318,41.65153853529924],[0.03969588944738445,41.651541805918015],[0.03971376972429572,41.65156062329174],[0.039752407785648564,41.65158215221135],[0.03979465677110295,41.65160350427274],[0.03988602119749911,41.651632606242316],[0.03992955596697664,41.65164948823451],[0.03993958742929026,41.65165619711021],[0.039968351608118506,41.651675434417314],[0.03999355934521909,41.651701840766634],[0.04000585559790465,41.65173745966629],[0.04000155651951174,41.65177364266802],[0.03998752269819514,41.65181002432095],[0.03993384247251406,41.65191499844431],[0.0399064931590255,41.65198778102845],[0.03987869457550017,41.65209657478536],[0.03987154648804941,41.65213727647139],[0.03986267424301351,41.65216458136081],[0.039847923768933036,41.65220997439829],[0.03980755819723356,41.65227854926681],[0.03978735697119576,41.65231062932676],[0.0397695957173166,41.65234709479867],[0.039757844288369676,41.65238344543852],[0.03975297859328857,41.65242411611149],[0.03975461138812371,41.65245838049552],[0.039754692692589313,41.652460093756645],[0.03976241996958375,41.65249586520693],[0.039775312175620324,41.65253159055675],[0.039792208417040606,41.65257165102716],[0.0398126778639959,41.65260712072893],[0.03984532034965278,41.652678297340344],[0.039888420936520154,41.652749203216246],[0.039899750755712435,41.652784978019326],[0.03990246230155005,41.65282539304425],[0.03990100971764384,41.65284035977143],[0.03989973315371473,41.652853510978275],[0.03989900644266644,41.65286150731441],[0.03988340855812481,41.65289793925871],[0.03982299431103434,41.65300310029855],[0.03980279308499652,41.653035180358444],[0.039796679324458795,41.65304764676378],[0.03978491196989489,41.653071643315826],[0.0397440929372068,41.65317631904341],[0.0397286140756973,41.65321275350229],[0.03970857042944851,41.65324925082547],[0.03966616386420511,41.6533061086308],[0.03966059408921564,41.6533135760688],[0.03962721818698753,41.653337031149846],[0.039608159414420085,41.65335700606448],[0.03959644067489746,41.653369288906106],[0.039574675385634625,41.65340141925745],[0.03955691413175548,41.653437884729385],[0.03954504200339567,41.653474232016464],[0.03952742659464041,41.65350945529025],[0.03952465972823856,41.65351498818487],[0.03951080444147017,41.653542693729264],[0.03949758031204822,41.6535615806728],[0.03948831998487233,41.6535748056404],[0.03938851917243118,41.65370353659338],[0.039367413538987255,41.65375064205381],[0.039358610025561444,41.653770290912405],[0.039341569615398024,41.653808324638504],[0.03932925156976292,41.65384916294957],[0.039294849722525456,41.653976004621455],[0.03927882436089661,41.65403509285139],[0.03927713624549725,41.654056445750996],[0.03927596780812548,41.65407122304717],[0.039281407663608055,41.65410711603502],[0.039310323554892744,41.654178376465495],[0.03936399288409906,41.65425614795873],[0.039382605739391195,41.65428311924833],[0.03939218541709694,41.654297000518994],[0.0394054858218423,41.65431627386832],[0.03942630395599031,41.65434644117781],[0.039450928312595376,41.6544222747749],[0.03945708817360331,41.65445818620299],[0.039456164487818746,41.654516564485675],[0.03945594907289441,41.654530202681144],[0.039453803305554584,41.65455188918051],[0.03945192324456115,41.65457089514709],[0.03943704788011598,41.65460725500702],[0.03941627919919963,41.65464382357635],[0.03934394253232732,41.654732627331185],[0.0393319027658941,41.654747407980096],[0.039311307590383746,41.65477269199252],[0.03926260956824479,41.6548369987957],[0.03925610688737672,41.65484747114613],[0.03921995489865273,41.65490569352545],[0.03921109941742416,41.65492864736862],[0.0392059194009554,41.6549420751783],[0.03919861708647711,41.65497826991475],[0.03919375139139601,41.65501894058772],[0.039193012107492216,41.655039557556165],[0.03919245806365955,41.655055020492085],[0.03919789791914211,41.655090913479995],[0.03921464077172523,41.65512646783898],[0.03923784355746767,41.65515732497917],[0.03926289874392143,41.65517922521707],[0.03928896814071942,41.655192054558825],[0.03933606186649572,41.65518633390957],[0.0394175440284636,41.655148178645845],[0.039442782778607764,41.65513278192702],[0.03945621058828894,41.65512459029256],[0.039527098862206865,41.65506869053877],[0.039586379037730636,41.65501163156773],[0.039623324792732284,41.654976069665025],[0.039725422246779336,41.654896838882365],[0.03976381052740279,41.654868829913084],[0.03980034640731491,41.65485428311925],[0.039848573366467556,41.654835081854316],[0.039941219385935034,41.6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这里开始第二个多边形
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]}}
另存为poly1.json
有没有什么办法可以单独保存，我希望最后的结果是这样的： array = [coordinates of polygon 1], [coordinates of polygon 2] 如果使用比示例更多的多边形，它们将自动保存而无需更改代码，array = [coordinates of polygon 1], [多边形 2 的坐标]、[多边形 3 的坐标] 等等。
到目前为止我有这个：
require 'rubygems'
require 'json'
file = File.read('poly1.json')
coordinates = JSON.parse(file)
string=coordinates.to_s[0...-4]
path = string.split"["
path.shift()
path.shift()
path.shift()
这只是从路径中的两个多边形获取所有坐标。但我想要的是将多边形 1 坐标与多边形 2 坐标分开，在我使用 3 多边形文件的情况下，无需手动操作即可将其分开。
抱歉我的英语不好，如果您需要其他东西，请在评论中提出。
你的例子太大了，不容易理解。但是从文件开头的关键结构
{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[ [[[0.03990083369766674,41.65117297365802], ...
看起来 coordinates 是嵌套在 geometry 键下方的简单散列。因此我会尝试以下操作：
require 'rubygems'
require 'json'
file = File.read('poly1.json')
data = JSON.parse(file)
coordinates = data["geometry"]["coordinates"]
coordinates[0] #=> should now return the first coordonate from the array