轉換台北市政府公開資料的格式
在台北市政府公開的資料中，有一大部份是用shapefile的格式開放的，如何把這些資料轉換出來，變成是一個問題，在這邊把我怎麼把TWD67座標的shapefile，轉換成WSG84的 GeoJSON格式。
首先，請參考前文把里介圖在QGIS中打開。
再來按這邊講的，把TWD67的定義加入到 QGIS 中
接著，選Layer Property -> Set Layer CRS -> TWD 67
然後，指定專案用的CRS定意，FIle -> Project Property -> CRS -> WSG 84
最後，是把Layer另存新檔，Layer -> Save As -> File Format: GeoJSON, Encoding: UTF-8
這樣，就可以把shapefile的內容匯出來，變成像下述的格式
{ "type": "Feature", "id": 0, "properties": { "AREA": 16326625.055040, "NEW": 6301200042.000000, "FULL": "臺北市北投區湖田里", "PERF_ID": 63012.000000, "COUN_ID": "6301200", "CPID": "63012", "CPTID": "6301200", "CPTVID": "6301200042", "NPID": 63012.000000, "NPTID": 6301200.000000, "NPTVID": 6301200042.000000, "PNAME": "臺北市", "TNAME": "北投區", "VNAME": "湖田里", "PTVNAME": "臺北市北投區湖田里", "PTNAME": "臺北市北投區", "TVNAME": "北投區湖田里", "TM2_MAX_X": 306973.245000, "TM2_MAX_Y": 2789383.300000, "TM2_MIN_X": 301490.096000, "TM2_MIN_Y": 2783263.350000, "MAX_X": 0.000000, "MAX_Y": 0.000000, "MIN_X": 0.000000, "MIN_Y": 0.000000 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 121.522589, 25.174993 ], [ 121.522587, 25.174995 ], [ 121.522557, 25.175033 ], [ 121.522408, 25.175170 ], [ 121.522317, 25.175324 ], [ 121.522314, 25.175367 ], [ 121.522323, 25.175569 ], [ 121.522315, 25.175789 ], [ 121.522322, 25.175950 ], [ 121.522270, 25.176082 ], [ 121.522158, 25.176302 ], [ 121.522043, 25.176548 ], [ 121.522002, 25.176598 ], [ 121.521997, 25.176648 ], [ 121.522278, 25.177273 ], [ 121.522359, 25.177825 ], [ 121.522384, 25.178200 ], [ 121.522338, 25.178332 ], [ 121.522127, 25.178615 ], [ 121.521821, 25.178986 ], [ 121.521780, 25.179026 ], [ 121.521691, 25.179134 ], [ 121.522349, 25.179671 ], [ 121.522623, 25.179892 ], [ 121.522810, 25.179997 ], [ 121.522949, 25.180089 ], [ 121.523101, 25.180244 ], [ 121.523337, 25.180539 ], [ 121.523425, 25.180655 ], [ 121.523550, 25.180683 ], [ 121.523641, 25.180779 ], [ 121.523652, 25.180779 ], [ 121.523816, 25.1809
首先，請參考前文把里介圖在QGIS中打開。
再來按這邊講的，把TWD67的定義加入到 QGIS 中
接著，選Layer Property -> Set Layer CRS -> TWD 67
然後，指定專案用的CRS定意，FIle -> Project Property -> CRS -> WSG 84
最後，是把Layer另存新檔，Layer -> Save As -> File Format: GeoJSON, Encoding: UTF-8
這樣，就可以把shapefile的內容匯出來，變成像下述的格式
{ "type": "Feature", "id": 0, "properties": { "AREA": 16326625.055040, "NEW": 6301200042.000000, "FULL": "臺北市北投區湖田里", "PERF_ID": 63012.000000, "COUN_ID": "6301200", "CPID": "63012", "CPTID": "6301200", "CPTVID": "6301200042", "NPID": 63012.000000, "NPTID": 6301200.000000, "NPTVID": 6301200042.000000, "PNAME": "臺北市", "TNAME": "北投區", "VNAME": "湖田里", "PTVNAME": "臺北市北投區湖田里", "PTNAME": "臺北市北投區", "TVNAME": "北投區湖田里", "TM2_MAX_X": 306973.245000, "TM2_MAX_Y": 2789383.300000, "TM2_MIN_X": 301490.096000, "TM2_MIN_Y": 2783263.350000, "MAX_X": 0.000000, "MAX_Y": 0.000000, "MIN_X": 0.000000, "MIN_Y": 0.000000 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 121.522589, 25.174993 ], [ 121.522587, 25.174995 ], [ 121.522557, 25.175033 ], [ 121.522408, 25.175170 ], [ 121.522317, 25.175324 ], [ 121.522314, 25.175367 ], [ 121.522323, 25.175569 ], [ 121.522315, 25.175789 ], [ 121.522322, 25.175950 ], [ 121.522270, 25.176082 ], [ 121.522158, 25.176302 ], [ 121.522043, 25.176548 ], [ 121.522002, 25.176598 ], [ 121.521997, 25.176648 ], [ 121.522278, 25.177273 ], [ 121.522359, 25.177825 ], [ 121.522384, 25.178200 ], [ 121.522338, 25.178332 ], [ 121.522127, 25.178615 ], [ 121.521821, 25.178986 ], [ 121.521780, 25.179026 ], [ 121.521691, 25.179134 ], [ 121.522349, 25.179671 ], [ 121.522623, 25.179892 ], [ 121.522810, 25.179997 ], [ 121.522949, 25.180089 ], [ 121.523101, 25.180244 ], [ 121.523337, 25.180539 ], [ 121.523425, 25.180655 ], [ 121.523550, 25.180683 ], [ 121.523641, 25.180779 ], [ 121.523652, 25.180779 ], [ 121.523816, 25.1809