Tag: maplibre

華盛頓郵報怎麼把 Mapbox 換成其他 open source 方案

在 Hacker News 上面看到「How The Post is replacing Mapbox with open source solutions」這篇，講華盛頓郵報怎麼把 Mapbox 換成 open source 方案，對應的討論在「Replacing Mapbox with open source solutions (kschaul.com)」這邊。

維基百科有提到大概兩年前，2020 年底的時候 Mapbox GL JS 從開源授權換成私有授權了 (也可以參考先前寫的「Mapbox GL JS 的授權改變，以及 MapLibre GL 的誕生」這篇)：

In December 2020, Mapbox released the second version of their JavaScript library for online display of maps, Mapbox GL JS. Previously open source code under a BSD license, the new version switched to proprietary licensing. This resulted in a fork of the open source code, MapLibre GL, and initiation of the MapLibre project.

裡面題到了四個工具。

第一個是 OpenMapTiles，下載部份的圖資使用，對於報導只需要某個區域很方便：

OpenMapTiles is an extensible and open tile schema based on the OpenStreetMap. This project is used to generate vector tiles for online zoomable maps. OpenMapTiles is about creating a beautiful basemaps with general layers containing topographic information.

第二個是 Maputnik，可以修改圖資呈現的方式：

A free and open visual editor for the Mapbox GL styles targeted at developers and map designers.

第三個是 PMTiles，可以將圖資檔案塞到一個大檔案裡面，然後透過 HTTP range requests 下載需要的部份就好，大幅下降 HTTP request 所需要的費用 (很多 CDN 會依照 HTTP request 數量收費)：

Protomaps is a serverless system for planet-scale maps.

An alternative to map APIs at 1% the cost, via single static files on your own cloud storage. Deploy datasets like OpenStreetMap for your site in minutes.

最後就是 fork 出來開源版本的 maplibre-gl-js：

MapLibre GL JS is an open-source library for publishing maps on your websites or webview based apps. Fast displaying of maps is possible thanks to GPU-accelerated vector tile rendering.

It originated as an open-source fork of mapbox-gl-js, before their switch to a non-OSS license in December 2020. The library's initial versions (1.x) were intended to be a drop-in replacement for the Mapbox’s OSS version (1.x) with additional functionality, but have evolved a lot since then.

這樣看起來好像可以用在像 KKTIX 這種下面顯示固定地圖的地方：

Mapbox GL JS 的授權改變，以及 MapLibre GL 的誕生

看到「MapLibre GL is a free and open-source fork of mapbox-gl-JS (github.com/maplibre)」這篇，翻了一下資料發現年初時 Mapbox GL JS 的軟體授權從 v2.0.0 開始變成不是 open source license (本來是 BSD license)，而社群也馬上 fork 最後一個 open source 版本並且投入開發，變成 MapLibre GL。

MapTiler 在年初的時候有提到這件事情：「MapLibre: Mapbox GL open-source fork」。

The community reacted swiftly: forks of the latest open-source version were made almost immediately by multiple parties. In another positive development, the community came together the next day and agreed to make this a joint effort, rather than splitting energies. A video call was organized and the MapLibre coalition was formed. It includes people working for MapTiler, Elastic, StadiaMaps, Microsoft, Ceres Imaging, WhereGroup, Jawg, Stamen Design, etc.

MapLibre GL 目前與本來 v1.13.0 相容，可以直接抽換過去 (後來在二月的時候有出一個 v1.13.1，不過那是在 v2.0.0 改 license 之後的事情了)：

  "dependencies": {
-    "mapbox-gl": "^1.13.0"
+    "maplibre-gl": ">=1.14.0"
  }

記錄一下，以後要在網站上用的話，得注意到 Mapbox GL JS 在沒有註冊的情況下不能使用，而且 SDK 會強制蒐集資料：

Mapbox gl-js version 2.0 or higher (“Mapbox Web SDK”) must be used according to the Mapbox Terms of Service. This license allows developers with a current active Mapbox account to use and modify the Mapbox Web SDK. Developers may modify the Mapbox Web SDK code so long as the modifications do not change or interfere with marked portions of the code related to billing, accounting, and anonymized data collection. The Mapbox Web SDK only sends anonymized usage data, which Mapbox uses for fixing bugs and errors, accounting, and generating aggregated anonymized statistics. This license terminates automatically if a user no longer has an active Mapbox account.

不過如果是抓 OpenStreetMap 資料的話，Leaflet 應該還是目前的首選...