投影参数内容:Ellipsoid 、 Datum ;Projection,可以参考《地图投影为什么》。 坐标系的文字描述的扩展BN范式(EBNF)定义如下: <coordinate system> = <projected cs> | <geographic cs> | <geocentric cs> <projection> = PROJECTION["<name>"] <parameter> = PARAMETER["<name>", <value>] <value> = <numbe...
PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",111],PARAMETER["scale_factor",1],PARAMETER["false_easting",500000],PARAMETER["false_northing",0], UNIT["metre",1], AUTHORITY["EPSG","4546"]] 从上面的字符串中我们可以看出一些参数的意思。PROJCS表...
PROJECTION["Lambert_Conformal_Conic"], PARAMETER["False_Easting",20500000.0], PARAMETER["False_Northing",0.0], PARAMETER["Central_Meridian",0.0], PARAMETER["Standard_Parallel_1",25.0], PARAMETER["Standard_Parallel_2",47.0], PARAMETER["Scale_Factor",1.0], PARAMETER["Latitude_Of_Origin",0.0], ...
PROJCS表示的是一个投影坐标系统,基于的地理坐标系统是CGCS2000 ,基准面是China_2000,椭球体是CGCS2000坐标系所依赖的椭球体,6378137表示的长半轴,298.257222101是扁率的倒数,起始经线是本初子午线,地理坐标系使用单位是度,0.0174532925199433代表一度所代表多少弧度。 PROJECTION["Transverse_Mercator"]表示是投影方法通用墨卡...
PROJECTION["Gauss_Kruger"], PARAMETER["False_Easting",13500000.000000], PARAMETER["False_Northing",0], PARAMETER["Central_Meridian",75.000000], PARAMETER["Scale_Factor",1.0], PARAMETER["Latitude_Of_Origin",0.0], UNIT["Meter",1.0]] ;
PROJECTION["Transverse_Mercator"], PARAMETER["False_Easting",500000.0], PARAMETER["False_Northing",0.0], PARAMETER["Central_Meridian",-123.0], PARAMETER["Scale_Factor",0.9996], PARAMETER["Latitude_Of_Origin",0.0], UNIT["Meter",1.0] ]
PROJECTION[“Gauss_Kruger”], PARAMETER[“False_Easting”,13500000.000000], PARAMETER[“False_Northing”,0], PARAMETER[“Central_Meridian”,75.000000], PARAMETER[“Scale_Factor”,1.0], PARAMETER[“Latitude_Of_Origin”,0.0], UNIT[“Meter”,1.0]] ; ...
投影坐标系的格式：<projected cs> = PROJCS["<name>", <geographic cs>, <projection>, {<parameter>,}* <linear unit>]WGS1984地理坐标，统一横轴墨卡托(UTM)投影，中央经线117E的投影坐标系WKT形式：PROJCS["WGS 84 / UTM zone 50N",GEOGCS["WGS 84", DATUM["WGS_1984", SPHEROID["WGS...
PROJECTION["Transverse_Mercator"], PARAMETER["latitude_of_origin",49], PARAMETER["central_meridian",-2], PARAMETER["scale_factor",0.999601272], PARAMETER["false_easting",400000], PARAMETER["false_northing",-100000], UNIT["metre",1,AUTHORITY["EPSG","9001"]], ...
nPROJECTION 用于指定从地理坐标到投影坐标转换的参数。 nSPHEROID 定义一个椭球体,椭球体是地球表面的近似。Spheroid和ellipsoid是同义词。Spheroid一般用于WKT中;而ellipsoid在任何地方使用,都是椭球体的意思。 nTOWGS84 用于指示Bursa Wolf变换的七个参数。这七个参数可以近似的从一个基准面到WGS基准面的变换。Bursa ...