What must be included on a plat when using GPS/GNSS methods?

When utilizing GPS/GNSS methods for surveys, it is essential to include a note that specifies the method employed along with the datum and epoch used in the calculations. This information is critical because it enhances the transparency and accuracy of the survey data, allowing others to understand the context in which the measurements were made. GPS/GNSS systems rely on specific reference frameworks, and different coordinates can yield different positional results based on the selected datum. Additionally, the epoch relates to the time at which the measurements were taken, which is vital for ensuring consistency in positional data, especially in areas where land or geographical features may change over time.

Including this information on a plat serves to communicate the technological processes behind the measurements, making it easier for subsequent users to assess and interpret the survey information accurately. This practice upholds professional standards and ensures the reliability of the data presented.