ee.Projection

    • The ee.Projection function creates a Projection object with a specified base coordinate system and an optional transform.

    • The base coordinate system ( crs ) can be provided as a well-known authority code (e.g., 'EPSG:4326') or a WKT string.

    • An optional transform can be provided either as a 2x3 affine transform matrix in row-major order using the transform argument, or as a WKT string using the transformWkt argument, but not both.

     Returns a Projection with the given base coordinate system and the given transform between projected coordinates and the base. If no transform is specified, the identity transform is assumed.
    Usage Returns
    ee.Projection(crs, transform , transformWkt ) Projection
    Argument Type Details
    crs
    		Object The base coordinate reference system of this Projection, given as a well-known authority code (e.g., 'EPSG:4326') or a WKT string.
    transform
    		List, default: null The transform between projected coordinates and the base coordinate system, specified as a 2x3 affine transform matrix in row-major order: [xScale, xShearing, xTranslation, yShearing, yScale, yTranslation]. May not specify both this and 'transformWkt'.
    transformWkt
    		String, default: null The transform between projected coordinates and the base coordinate system, specified as a WKT string. May not specify both this and 'transform'.

    Examples

    Code Editor (JavaScript) 

     // Construct projections. 
 // Printing the projection will show the EPSG code if it is a direct match. 
 // 
 // e.g. You will see this for the string 'EPSG:3857' 
 //   type: Projection 
 //   crs: EPSG:3857 
 //   transform: [1,0,0,0,1,0] 
 print 
 ( 
 ee 
 . 
 Projection 
 ( 
 'EPSG:3857' 
 )); 
  
 // https://epsg.io/3857 
 print 
 ( 
 ee 
 . 
 Projection 
 ( 
 'EPSG:4326' 
 )); 
  
 // https://epsg.io/4326 
 // WKT projection description for https://epsg.io/27572 
 var 
  
 proj 
  
 = 
  
 ee 
 . 
 Projection 
 ( 
  
 'PROJCS["NTF (Paris) / Lambert zone II", ' 
  
 + 
  
 '  GEOGCS["NTF (Paris)", ' 
  
 + 
  
 '    DATUM["Nouvelle Triangulation Francaise (Paris)", ' 
  
 + 
  
 '      SPHEROID["Clarke 1880 (IGN)", 6378249.2, 293.4660212936269,' 
 + 
  
 '               AUTHORITY["EPSG","7011"]], ' 
  
 + 
  
 '      AUTHORITY["EPSG","6807"]], ' 
  
 + 
  
 '    PRIMEM["Paris", 2.5969213, AUTHORITY["EPSG","8903"]], ' 
  
 + 
  
 '    UNIT["grade", 0.015707963267948967], ' 
  
 + 
  
 '    AXIS["Geodetic longitude", EAST], ' 
  
 + 
  
 '    AXIS["Geodetic latitude", NORTH], ' 
  
 + 
  
 '    AUTHORITY["EPSG","4807"]], ' 
  
 + 
  
 '  PROJECTION["Lambert_Conformal_Conic_1SP", AUTHORITY["EPSG","9801"]], ' 
  
 + 
  
 '  PARAMETER["central_meridian", 0.0], ' 
  
 + 
  
 '  PARAMETER["latitude_of_origin", 52.0], ' 
  
 + 
  
 '  PARAMETER["scale_factor", 0.99987742], ' 
  
 + 
  
 '  PARAMETER["false_easting", 600000.0], ' 
  
 + 
  
 '  PARAMETER["false_northing", 2200000.0], ' 
  
 + 
  
 '  UNIT["m", 1.0], ' 
  
 + 
  
 '  AXIS["Easting", EAST], ' 
  
 + 
  
 '  AXIS["Northing", NORTH], ' 
  
 + 
  
 '  AUTHORITY["EPSG","27572"]]' 
 ); 
 print 
 ( 
 proj 
 ); 
  
 // crs: EPSG:27572

    Python setup

    See the Python Environment page for information on the Python API and using geemap for interactive development.

     import 
  
 ee 
 import 
  
 geemap.core 
  
 as 
  
 geemap

    Colab (Python) 

     # Construct projections. 
 # Printing the projection will show the EPSG code if it is a direct match. 
 # 
 # e.g. You will see this for the string 'EPSG:3857' 
 #   type: Projection 
 #   crs: EPSG:3857 
 #   transform: [1,0,0,0,1,0] 
 display 
 ( 
 ee 
 . 
 Projection 
 ( 
 'EPSG:3857' 
 )) 
 # https://epsg.io/3857 
 display 
 ( 
 ee 
 . 
 Projection 
 ( 
 'EPSG:4326' 
 )) 
 # https://epsg.io/4326 
 # WKT projection description for https://epsg.io/27572 
 proj 
 = 
 ee 
 . 
 Projection 
 ( 
 'PROJCS["NTF (Paris) / Lambert zone II", ' 
 + 
 '  GEOGCS["NTF (Paris)", ' 
 + 
 '    DATUM["Nouvelle Triangulation Francaise (Paris)", ' 
 + 
 '      SPHEROID["Clarke 1880 (IGN)", 6378249.2, 293.4660212936269,' 
 + 
 '               AUTHORITY["EPSG","7011"]], ' 
 + 
 '      AUTHORITY["EPSG","6807"]], ' 
 + 
 '    PRIMEM["Paris", 2.5969213, AUTHORITY["EPSG","8903"]], ' 
 + 
 '    UNIT["grade", 0.015707963267948967], ' 
 + 
 '    AXIS["Geodetic longitude", EAST], ' 
 + 
 '    AXIS["Geodetic latitude", NORTH], ' 
 + 
 '    AUTHORITY["EPSG","4807"]], ' 
 + 
 '  PROJECTION["Lambert_Conformal_Conic_1SP", AUTHORITY["EPSG","9801"]], ' 
 + 
 '  PARAMETER["central_meridian", 0.0], ' 
 + 
 '  PARAMETER["latitude_of_origin", 52.0], ' 
 + 
 '  PARAMETER["scale_factor", 0.99987742], ' 
 + 
 '  PARAMETER["false_easting", 600000.0], ' 
 + 
 '  PARAMETER["false_northing", 2200000.0], ' 
 + 
 '  UNIT["m", 1.0], ' 
 + 
 '  AXIS["Easting", EAST], ' 
 + 
 '  AXIS["Northing", NORTH], ' 
 + 
 '  AUTHORITY["EPSG","27572"]]' 
 ) 
 display 
 ( 
 proj 
 ) 
 # crs: EPSG:27572
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