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Making Contour Line from DTM / 登山等高線製作 - 鍾木騰
由於場地問題,第二天我們移動到另一棟大樓啦!議程教室變動請見網站上的議程表。
歡迎來到 https://hackmd.io/@coscup/2019 共筆
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Learn More →點擊本頁上方的 開始用 Markdown 一起寫筆記!
手機版請點選上方 按鈕展開議程列表。
魯地圖的圖資來源為OSM,但OSM沒有等高線->自己手繪
但後來發現做出來的等高線有些問題->把所有步驟程式化
https://github.com/alpha-rudy/taiwan-contour
目前DEM來源為內政部開放資料-MOI v2019,使用光達技術,解析度高且較沒有盲點(會把國防機密地區屏蔽)
但2016的MOI有離島跟被屏蔽區域的資料(無光達技術),所以有手動把2016跟2019的資料merge起來
NASA的DEM在河谷地顯示有問題,因衛星探測盲點導致
等高線的優缺點
向量->放大也不會模糊
規格
海拔間距
間距等級
gdalwarp — GDAL documentation
統一座標
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Learn More →有兩種值要歸零
來源
TGOS(地理資訊圖資平台)
JAXA AW3D30
使用 Phyghtmap 向量化
使用 gdalwarp resample
tags:
COSCUP2019
OpenStreetMap x Wikidata
IB503