OUTPUTDATUM

Choose the datum to output

Platform:

OEM719, OEM729, OEM7500, OEM7600, OEM7700, OEM7720, PwrPak7, CPT7, CPT7700, SMART7, SMART2

This command is used to select the geodetic datum and co-ordinate epoch in which solutions are output. If not set, the factory default value is the service datum and service epoch.

For either a plate-fixed or earth-fixed output datum, using a fixed epoch will compensate for plate motion such that you get repeatable co-ordinates over time for a location. Compensation is controlled using the TECTONICSCOMPENSATIONSOURCE command and reported by the TECTONICSCOMPENSATION log. The TECTONICSCOMPENSATION log will warn when operating in a region where tectonics compensation may be imprecise.

In order for solutions to be transformed to the requested datum, the datum selected must be in the list of datums shown in the GEODETICDATUMS log.

To view the current datum, use the BESTDATUMINFO log.

Message ID: 1144

Abbreviated ASCII Syntax:

OUTPUTDATUM name epoch_option epoch

Factory Default:

OUTPUTDATUM SERVICE SERVICE_EPOCH 0

ASCII Example:

To output co-ordinates in NAD83(CSRS), 2018:

OUTPUTDATUM NAD83(CSRS) FIXED_EPOCH 2018.000

To output co-ordinates in ITRF2014, 2010.00:

OUTPUTDATUM ITRF2014 FIXED_EPOCH 2010.000

The OUTPUTDATUM command only accepts a non-zero epoch if the FIXED_EPOCH option is specified. The earliest fixed epoch must be greater than 1900.

Do not mix the OUTPUTDATUM command and the DATUM USER commands.

Field

Field Type

ASCII Value

Binary Value

Description

Format

Binary Bytes

Binary Offset

1

Command header

OUTPUTDATUM header

This field contains the command name for abbreviated ASCII or the message header for ASCII (see page 1) or Binary (see page 1).

H

0

2

name

 

The datum output.

Char[32]

variable

H

3

epoch_option

See Table: Epoch Options

Epoch type to enter coordinates in.

Enum

4

variable

4

epoch

0 = unknown (default),
else >1900.00

Co-ordinate epoch (decimal year).

Example:

2011.00 = Jan 1, 2011

2011.19 = Mar 11, 2011

Double

8

variable

Epoch Options

Binary

ASCII

Description

0

SERVICE_EPOCH

Output coordinates in the epoch of the corrections (default)

1

FIXED_EPOCH

Output coordinates in the specified epoch

2

CURRENT_EPOCH

Output coordinates in the current epoch