map testing

shapefiles to geojson

ogr2ogr -f geoJSON kc.json kc.shp

shapefiles info

ogrinfo tl_2010_20_tract10.shp tl_2010_20_tract10

# SCRIPT

# sudo apt-get install npm gdal-bin
# sudo npm install -g mapshaper

# convert shp to geojson & big5 to utf8
mapshaper -p 0.01 --auto-snap -f geojson --encoding big5 -o json/102_05_21_twd97.geo.json 全國村里界圖102.05.21_修正屬性表ID_TWD97/102_05_21台澎金馬修正村里屬性資料_TWD97.shp

# convert geojson polygons from EPSG:3826 to EPSG:4326
ogr2ogr -t_srs EPSG:4326 -s_srs EPSG:3826 -f "GeoJSON" -lco ENCODING=UTF-8 json/102_05_21_4326.geo.json json/102_05_21_twd97.geo.json

# convert geojson to topojson
mapshaper -p 0.01 --auto-snap -f topojson --encoding utf8 -o json/102_05_21_4326.topo.json json/102_05_21_4326.geo.json

epsg 3826: http://spatialreference.org/ref/epsg/twd97-tm2-zone-121/

epgs 4326: http://spatialreference.org/ref/epsg/wgs-84/

tutorial: https://g0v.hackpad.com/GIS-YAuGma5fg7W

read more: http://vallandingham.me/shapefile_to_geojson.html

sample data from: http://www.nlsc.gov.tw/websites/make_page.aspx?la=1&le=2&li=11&sno=136&le2=3&li2=135