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Fields for table: GPR_THICK_POINT

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.
LAYER_DIELECTRIC_CONST

NUMBER(4,2)


Interpreted dielectric constant of layer.
LAYER_THICKNESS

NUMBER(3)
mm

Interpreted thickness of layer.
LAYER_TYPE
LAYER_TYPEVARCHAR2(2)


A character code indicating the type of layer.
SECTION_STAT_INCLUDE_FLAG
SECTION_STAT_INCLUDE_FLAGVARCHAR2(1)


Code indicating whether the record is included in the section statistics.
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
POINT_LOC

NUMBER(4,1)
m

The distance from the start of the section to where the test was performed.
GPR_LAYER_NO

NUMBER(1)


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