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Fields for table: GPR_LINK_LAYER

Field NameCodesData TypeUnitsTest ProtocolDescription
STATE_CODE
STATE_PROVINCENUMBER(2)


Numerical code for state or province. U.S. codes are consistent with Federal Information Processing Standards.
SHRP_ID

VARCHAR2(4)


Test section identification number assigned by LTPP program. Must be combined with STATE_CODE to be unique.
GPR_DATE

DATE


Date survey was performed.
GPR_TIME

VARCHAR2(4)
hhmm

Time of day at beginning of measurement run.
LANE_POSITION
LANE_POSITIONVARCHAR2(1)


Code indicating lane position of the GPR measurement
GPR_LAYER_NO

NUMBER(1)


Layer number from interpretation of GPR measurement: layer one corresponds to the surface layer.
L05B_LAYER_NO

NUMBER(2)


Layer number fromTST_L05B table corresponding to layer identified by GPR interpretation.
RECORD_STATUS

VARCHAR2(1)


A code indicating the general quality of the data.
CONSTRUCTION_NO

NUMBER(2)


Event number used to relate changes in pavement structure with other time dependent data elements. This field is set to 1 when a test section is initially accepted into LTPP and is incremented with each change to the layer structure.