http://d4sg.org/fellowship/ http://beta.hackfoldr.org/farmland
https://github.com/pm5/farmland/tree/gh-pages/data
avg-sgw.csv : Environment Protection Administration's monitored land
X: average longitude of the monitored land
Y: average latitude of the monitored land
tari-over.csv : Taiwan Agricultural Research Institute's general survey
X: longitude
Y: latitude
OBJECTID: land' id
YEAR : general survey year
overed : whether the amount of heavy metal over the limitation
not_resed : whether the land is not monitored
https://public.tableau.com/profile/wenchih#!/vizhome/2016-05-10D4SG-Farmland/sheet12