148
(3)Show file list
PCODE. LIB code fixed file
COORD. PTS known data
Those two files are system file , which could not
be deleted or changed.
JOB1.JOB job file
JOB1.HAL horizontal alignment file
JOB1.VCL vertical curve file
JOB1.TXT text file
PCODE. LIB [CODE]
COORD. PTS [Know]
JOB1.JOB [JOB]
JOB1.HAL [HZAL]
JOB1.JVCL [VTAL]
ATTR SRCH EXIT P1
20.7 Setting for Grid Factor
When calculating coordinates, measured horizontal distance should be multiplied by scale factor. The raw data will
not be changed by scale factor.
Formula:
1
.
Height factor =
ELEV
R
R
R
:
the average radius of the earth
ELEV
:
the average height of sea level
2
.
Scale factor
Scale factor
:
the scale factor of station point
3
.
Grid factor
Grid factor = height factor × scale factor
Distance calculation
1
.
Grid distance
HDg = HD × grid factor
HDg
:
Grid distance
HD
:
ground distance
2
.
Ground distance
HD = HDG/ grid factor
Note
:
1. Input range of scale factor: 0.990000
~
1.010000 Default value: 1.00000.
2. The input range of average altitude
:
-9999.8
~
9999.8.
Average altitude keeps 1 digit after radix point, default value is 0.