[不幸的是,我从爱尔兰横轴墨卡托(ITM)到WGS84纬度的投影似乎出错了,因为绘制的坐标未与都柏林sourced from the CSO的地图对齐(请参见下文)。
My transformed coordinates plotted on a map of Dublin
[转换后的数据来自Irish Valuation Office,并将ITM X和Y坐标输入到previous stackoverflow discussion改编的函数中,该函数使用geopandas内置的points_from_xy方法在坐标参考系统之间转换坐标:
def create_geodf_from_GPS (df, latitude, longitude, crs):
locations = gpd.points_from_xy(longitude, latitude)
geo_df = gpd.GeoDataFrame(df, geometry=locations)
geo_df.crs = crs
return geo_df
VO_geo = create_geodf_from_GPS(VO, VO[" X ITM"], VO[" Y ITM"], crs = 'epsg:2157')
VO_geo = VO_geo.to_crs('epsg:4326')
有人知道这里出了什么问题吗?
def create_geodf_from_GPS (df, x, y, crs):
locations = gpd.points_from_xy(x, y)
geo_df = gpd.GeoDataFrame(df, geometry=locations)
geo_df.crs = crs
return geo_df
现在在WGS84纬度-经度中绘制数据按预期工作:
VO_geo = create_geodf_from_GPS(VO, x=VO[" X ITM"], y=VO[" Y ITM"], crs = 'epsg:2157')
VO_geo.to_crs('epsg:4326').plot()
注:必须通过使用geopandas(gpd)空间联接函数过滤掉非都柏林数据来清理数据以消除明显的异常值
VO_geo_clean = gpd.sjoin(VO_geo.to_crs('epsg:4326'), map_of_Dublin)
结果:VO data plotted over a map of Dublin