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從圖層看 OSM
所記錄的世界
2015/09/18 SOTM Taiwan
1
⿈黃裕翔
關於我...
• 2014/2 開始繪圖
• 2015/9/17之前 ⼯工程顧問公司 ⽔水利⼯工程師

(我真的只是剛好在SOTM前⼀一天離職)
• OSM ID : yellowsoar
2
在談圖層前...
先知道兩個東⻄西
3
圖磚 - OSM 的⼀一部分
4
資料 - 也是 OSM 的⼀一部分
5
在談圖層前...
先聊聊資料組成
6
資料組成 - 圖徵與標籤
7
點 路徑
關係 開放式 封閉式 填滿式
標籤
然後這些資料
會轉出成圖磚
8
在談圖層前...
先來看標⽰示⽅方法
9
點
興趣點
POI
Point Of Interest
10
點
興趣點
POI
Point Of Interest
11
Photo by:KOKUYO
點
興趣點
POI
Point Of Interest
12
開放/封閉路徑
• 道路
• 鐵路
• ⽔水路
• 電路
• 纜線
• 管線
• ⾏行政界
• ⼭山徑
13
填滿式路徑
(就是⾯面積)
• Building
• Landuse
• Landuse
• Amenity
• Leisure
• Tourism
• Natural
• Waterway
• Highway?
14
http://wiki.openstreetmap.org/wiki/Proposed_features/Street_area
那圖層是...?
15
OSM WIKI
圖層
layer=*
16
這顯然不⾜足以代表
OSM 所記錄的世界嘛!
17
所以看圖徵之間的關聯
18
例如
• 與道路相交的⽔水路,原則上不會跟道路相連。
• 標⽰示為 Amenity 的學校裡⾯面有好幾棟建築物。
• Landuse、Natural、Waterway 相連但絕不重疊。
• 電路跨過建築物⼜又跨過道路網跟誰都不相連。
• ⾏行政界最孤僻,跟其他圖徵幾乎⽼老死不相往來。
• 興趣點愛怎麼樣就怎麼樣,黏在哪都可以。
19
依據這些關聯重新分類
20
21
圖層 對應的圖徵
POI
族繁
不及備載
交通路網
道路
鐵路
⼭山徑
⽔水系
河川
排⽔水路
灌溉溝
管線路
電路
纜線
管線
圖層 對應的圖徵
⾏行政界
國界、縣市界
鄉鎮市區界
村⾥里界
建築物
⼟土地使⽤用
室內地圖
那...
這有什麼意義?
22
提升資料編輯品質
例如使⽤用 JOSM 編輯⼟土地利⽤用時,所採⽤用的過濾條件:
landuse=* OR waterway=* OR amenity=* OR natural=*
23
⼯工作⼩小組
任務導向性的繪圖⼯工作模式
24
End
25

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20150918 從圖層看OSM所記錄的世界