Project (Data Management)


Projects spatial data from one coordinate system to another.



Project_management (in_dataset, out_dataset, out_coor_system, {transform_method}, {in_coor_system})
ParameterExplanationData Type

The feature class, feature layer, or feature dataset to be projected.

Feature Layer; Feature Dataset

The output dataset to which the results will be written.


Valid values are a Spatial Reference object, a file with a .prj extension, or a string representation of a coordinate system.

Coordinate System

This method can be used for converting data between two geographic coordinate systems or datums. This optional parameter may be required if the input and output coordinate systems have different datum.


Transformations are bi-directional. For example, if converting data from WGS 1984 to NAD 1927, you can pick a transformation called NAD_1927_to_WGS_1984_3, and the tool will apply it correctly.


The coordinate system of the input feature class or dataset. This parameter becomes enabled when the input has an Unknown, or unspecified, coordinate system. This allows you to specify the data's coordinate system without having to modify the input data (which may not be possible if the input is in read-only format).

Coordinate System

Code Sample

Project example 1 (Python window)

The following Python window script demonstrates how to use the Project function in immediate mode.

import arcpy
import os

input_features = "C:/data/input/projections.gdb/wells"
output_features_class = "C:/data/output/wells_UTM11N.shp"

install_dir = arcpy.GetInstallInfo()['InstallDir']
out_coordinate_system = os.path.join(install_dir, r"Coordinate Systems/Projected Coordinate Systems/UTM/NAD 1983/NAD 1983 UTM Zone 11N.prj")

arcpy.Project_management(input_features, output_features_class, out_coordinate_system)
Project example 2 (stand-alone script)

The following stand-alone script demonstrates how to use Project in a stand-alone script.

# Name:
# Description: project all feature classes in a geodatabase

# import modules
import arcpy
import os

# Set environment settings
arcpy.env.workspace = "C:/data/Redlands.gdb"

# Set local variables
outWorkspace = "c:/data/Redlands11UTM.gdb"

# Set output coordinate system to 'NAD 1983 UTM Zone 11N'
# by using its factory code 26911 (available in *.prj file)
outCS = arcpy.SpatialReference()
outCS.factoryCode = 26911

# Use ListFeatureClasses to generate a list of inputs 
for infc in arcpy.ListFeatureClasses():

    # Determine if the input has a defined coordinate system, can't project if it does not
    dsc = arcpy.Describe(infc)

    if dsc.spatialReference.Name == "Unknown":
        print('skipped this fc due to undefined coordinate system: ' + infc)
        # Determine the new output feature class path and name
        outfc = os.path.join(outWorkspace, infc)

        # project data
        arcpy.Project_management(infc, outfc, outCS)


Related Topics

Licensing Information

ArcView: Yes
ArcEditor: Yes
ArcInfo: Yes