歡迎來到 https://hackmd.io/@coscup/2019 共筆
講者:魯地圖作者
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
海拔間距
間距等級
統一座標
有兩種值要歸零
使用 Phyghtmap 向量化
使用 gdalwarp resample
COSCUP2019
OpenStreetMap x Wikidata
IB503
or
or
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