9. 1 overview 3 1 scope and application 3



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9.5.3 GPS UNIT


Record the kind of GPS unit used to collect coordinates. If suitable coordinates cannot be obtained, record 0.
When collected: All field visited plots

Field width: 1 digit

Tolerance: No errors

MQO: At least 99% of the time

Values:


0

GPS coordinates not collected

1

Rockwell Precision Lightweight GPS Receiver (PLGR)

2

Other brand capable of field-averaging

3

Other brands capable of producing files that can be post-processed

4

Other brands not capable of field-averaging or post processing


9.5.4 GPS SERIAL NUMBER


Record the last six digits of the serial number on the GPS unit used.
When collected: When GPS UNIT >0

Field width: 6 digits

Tolerance: No errors

MQO: At least 99% of the time

Values: 000001 to 999999


9.5.5 GPS DATUM


Record the acronym indicating the map datum that the GPS coordinates are collected in (i.e., the map datum selected on the GPS unit to display the coordinates).
When collected: When GPS UNIT >0

Field width: 5 characters (cccnn)

Tolerance: No errors

MQO: At least 99% of the time



Values:


NAD27

North American Datum of 1927

NAD83

North American Datum of 1983

WGS84

World Geodetic System of 1984



9.5.6 Latitude


Record the latitude of the plot center to the nearest hundredth second, as determined by GPS.
NOTE: The following can be customized at the region level (e.g., decimal minutes to the nearest thousandth) as long as the final results recorded are within the specified tolerance to the nearest hundredth of a second or +/- 1.01 ft.


9.5.6.1 LATITUDE DEGREES


Record the latitude degrees of the plot center as determined by GPS.
When collected: When GPS UNIT = 1, 2, 3 or 4

Field width: 2 digits

Tolerance: No errors

MQO: At least 99% of the time

Values:


9.5.6.2 LATITUDE MINUTES


Record the latitude minutes of the plot center as determined by GPS.
When collected: When GPS UNIT = 1, 2, 3 or 4

Field width: 2 digits

Tolerance: No errors

MQO: At least 99% of the time

Values: 1 – 59


9.5.6.3 LATITUDE SECONDS


Record the latitude decimal seconds of the plot center to the nearest hundredth place as determined by GPS.
When collected: When GPS UNIT = 1, 2, 3 or 4

Field width: 4 digits

Tolerance: +/- 140 ft

MQO: At least 99% of the time

Values: 0.00 – 59.99


9.5.7 Longitude


Record the longitude of the plot center to the nearest hundredth second, as determined by GPS.
NOTE: The following can be customized at the region level (e.g., decimal minutes to the nearest thousandth) as long as the final results recorded are within the specified tolerance to the nearest hundredth of a second or +/- 1.01 ft.


9.5.7.1 LONGITUDE DEGREES


Record the longitude degrees of the plot center as determined by GPS
When collected: When GPS UNIT = 1, 2, 3 or 4

Field width: 3 digits

Tolerance: No errors

MQO: At least 99% of the time

Values:


9.5.7.2 LONGITUDE MINUTES


Record the longitude minutes of the plot center as determined by GPS.
When collected: When GPS UNIT = 1, 2, 3 or 4

Field width: 2 digits

Tolerance: No errors

MQO: At least 99% of the time

Values: 1 – 59


9.5.7.3 LONGITUDE SECONDS


Record the longitude decimal seconds of the plot center to the nearest hundredth place as determined by GPS.
When collected: When GPS UNIT = 1, 2, 3 or 4

Field width: 4 digits

Tolerance: +/- 140 ft

MQO: At least 99% of the time

Values: 0.00 – 59.99


9.5.8 GPS ELEVATION


Record the elevation above mean sea level of the plot center, in feet, as determined by GPS.

If no GPS Unit is available, record elevation from the appropriate USGS topographic map.
When collected: When GPS UNIT = 1, 2 or 4

Field width: 6 digits

Tolerance:

MQO: At least 99% of the time

Values: -00100 to 20000




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