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# Convert UTM in meters to State Plane in Feet

3882
2
04-23-2020 11:47 AM
New Contributor

=1= SEEKING INSTRUCTIONS

I want to convert XYZ coordinates in UTM N15 to NAD83 State Plane Coordinates Louisiana South.

I am looking for a set of steps to follow; but any advice will be appreciated.

=2= UNSUCCESSFUL ATTEMPTS

I have displayed XY data to create a shape file successfully in UTM N15

But when I try to convert the file to state plane coordinates, the resulting files does not overlay and match my other state plane files.

=3= DATA FILE

I have attached a CSV file with about 325 points of a much larger (huge!) file with about 3.4 million Lidar points for one quarter of a USGS Quad for there City of Lafayette, Louisiana. The data was downloaded from the Atlas GIS site at Louisiana State University (LSU):

=4= DATA STRUCTURES

The file has 325 points with four fields:

-1- FID: an identification number from 1 to 325

-2- YUTMn15mt: The Y coordinate (Northing) for UTM N15 in meters

-3- XUTMn15mt: The X coordinate (Eastring) for UTM N15 in meters

-4- ZUTMn15ft: The Z coordinate (Elevation ) for UTM N15 in feet.

=4= UTM N15

Here is a quote from the readme file  attached to the data:

The points are stored as X,Y,Z values.  The X, Y coordinates are UTM zone 15 North meters with a datum of North American Datum 1983.  The z value is in feet.

The ArcMap WKID for UTM N15 file is 26915 with these parameters:

Authority: EPSG Projection:

Transverse_Mercator False_Easting: 500000.0

False_Northing: 0.0

Central_Meridian: -93.0

Scale_Factor: 0.9996

Latitude_Of_Origin: 0.0

Linear Unit: Meter (1.0)

=5= LA SOUTH STATE PLANE NAD83

The ArcMap WKID for Louisiana State Plane South NAD 83 is 3452 with these parameters:

WKID: 3452 Authority: EPSG Projection:

Lambert_Conformal_Conic False_Easting: 3280833.333333333

False_Northing: 0.0

Central_Meridian: -91.33333333333333

Standard_Parallel_1: 29.3

Standard_Parallel_2: 30.7 L

atitude_Of_Origin: 28.5

Linear Unit: Foot_US (0.3048006096012192)

2 Replies
Regular Contributor

How are you re-projecting? Your UTM coordinates look valid to me.

New Contributor

Dana,

Thanks for your kind response. I am at a loss and have been trying to solve this problems for 3 days now.

Any suggestions would be appreciated.

Thanks,

Mike LeBlanc

=METHDOLOGY=

Here is list of the steps that I used to generate the last two screen shorts:

-1- add data in a new MXD by attaching the csv file posted on the community board.

-2- right lick on file and then select display X Y data.

-3- enter values as shown on the screen shot below:

-4- press OK and then OK to the pop up box.

-5- The event shape file is created with points indicated with red circles:

-6- open the project (data management tool)

-7- Select YES to the Active X pop up box as shown below:

8. Enter the values on the project (data management) dialog box as shown below:

-9- The XY coords for the South La State Plane shape file (shown as black X’s) matches the XY coords for the UTM N15 event (shown as red circles):

-10- The Layer properties - Source Tab for the South LA state plane shape file has these values:

Data Type: Shapefile Feature Class

Shapefile: P:\SLCC\21_SLCC_GIS_Spring_2020\01_SLCC_GIS_2020\18_lidair_points\_try_3\_csv_sub_sets\Lidair_pts_Lafayette_louisiana_LA_South_State_Plane_1x0.shp

Geometry Type: Point

Coordinates have Z values: Yes

Coordinates have measures: Yes

Projection: Lambert_Conformal_Conic

False_Easting: 3280833.33333333

False_Northing: 0.00000000

Central_Meridian: -91.33333333

Standard_Parallel_1: 29.30000000

Standard_Parallel_2: 30.70000000

Latitude_Of_Origin: 28.50000000

Linear Unit: Foot_US

Geographic Coordinate System: GCS_North_American_1983

Datum: D_North_American_1983

Prime Meridian: Greenwich

Angular Unit: Degree

-11- Add the South LA State Plane point shape file first (black X) and then a South LA State Plane roadway shape file (red blob) inside the City of Lafayette to a new MXD:

The first image shows the pointer values in the lower right hand corner of the center of the roadway blob as 3108889.3, 603705.75 feet:

The second image shows the pointer values in the lower right hand corner of the center of the black X blob as 12424607.457,-7966754.92 feet.