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ee.Projection

  • Theee.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 thetransform argument, or as a WKT string using thetransformWkt 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.

UsageReturns
ee.Projection(crs,transform,transformWkt)Projection
ArgumentTypeDetails
crsObjectThe base coordinate reference system of this Projection, given as a well-known authority code (e.g., 'EPSG:4326') or a WKT string.
transformList, default: nullThe 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'.
transformWktString, default: nullThe 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/3857print(ee.Projection('EPSG:4326'));// https://epsg.io/4326// WKT projection description for https://epsg.io/27572varproj=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 usinggeemap for interactive development.

importeeimportgeemap.coreasgeemap

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/3857display(ee.Projection('EPSG:4326'))# https://epsg.io/4326# WKT projection description for https://epsg.io/27572proj=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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Last updated 2024-07-13 UTC.