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Fields for table: GPR_THICK_SECT

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_THICK_MIN

NUMBER(3)
mm

Minimum interpreted thickness of layer for the section.
LAYER_THICK_MAX

NUMBER(3)
mm

Maximum interpreted thickness of layer for the section.
LAYER_THICK_STD

NUMBER(3)
mm

Standard deviation of the interpreted thickness of layer for the section.
LAYER_DIELECTRIC_MEAN

NUMBER(4,2)


Average interpreted dielectric constant of layer for the section.
LAYER_DIELECTRIC_MIN

NUMBER(4,2)


Minimum interpreted dielectric constant of layer for the section.
LAYER_DIELECTRIC_MAX

NUMBER(4,2)


Maximum interpreted dielectric constant of layer for the section.
LAYER_DIELECTRIC_STD

NUMBER(4,2)


Standard deviation of the interpreted dielectric constant of layer for the section.
LAYER_TYPE_SECTION
LAYER_TYPEVARCHAR2(2)


A character code indicating the type of layer for the section.
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.
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.
LAYER_THICK_MEAN

NUMBER(3)
mm

Average interpreted thickness of layer for the section.