C3D 2013: Survey Databases-What Point Coordinate System used in the .fkb file?

[scottchang]

Hi all,

1) I just imported the Survey-1.fbk and Survey-X.fbk files of AutoCAD Civil 3D 2013 into the Survey Database of my Survey 1 project to get 2 drawings (see the 2 attached files) for these 2 sets of .fbk data:

Survey-1.fbk:

UNIT FOOT DMS
HORIZ ANGLE RIGHT
PRISM CONSTANT 0
PRISM OFFSET 0
EDM OFFSET 0
CR OFF
ATMOS OFF
COLLIMATION OFF
JOB LINEWORK SAMPLE
SCALE FACTOR 1.000000
VERT ANGLE ZENITH
NE 1 5000.000 5000.000 263.650 "STA1"
NE 6 5088.000 6104.000 249.635 "STA6"
AZ 6 6000 135.000000
AZ 1 1000 315.000000
STN 1 0.000000 "STA1"
PRISM 0.000000
FC1 VA 1000 0.000000 00.000 90.000000 "AZMK"
FC1 VA 2 117.563300 300.023 90.421692 "STA2"
FC1 VA 101 29.082602 91.481  89.454093 "SDWK1 B"
FC1 VA 102 28.024103 85.731  89.401866 "SHD1 B"
FC1 VA 103 27.134289 81.910  89.495311 "EP1 B"
FC1 VA 104 20.092686 59.515  89.171525 "EP2 B"
FC1 VA 105 19.192302 57.714  88.440647 "TC1 B H0.5 H-0.1 V-0.5"
FC1 VA 106 15.234405 50.640  88.011060 "CLM B"
FC1 VA 107 10.132014 43.849  88.193331 "TC2 B H-0.5 H0.1 V-0.5"
FC1 VA 108 8.402312 42.206  88.594830 "EP3 B"
FC1 VA 109 336.480464 26.931  89.292180 "EP4 B"
FC1 VA 110 328.294524 25.715  88.542934 "SHD2 B"
FC1 VA 111 315.000000 25.003  89.074501 "SDWK2 B"
FC1 VA 112 84.000234 20.591  90.352368 "WSO"
FC1 VA 113 135.000000 25.003  90.521499 "SDWK2"
FC1 VA 114 121.301476 25.711  90.360605 "SHD2"
FC1 VA 115 113.115536 26.935  91.062236 "EP4"
FC1 VA 116 81.193688 42.200  90.014753 "EP3"
FC1 VA 117 79.463986 43.833  89.191297 "TC2"
FC1 VA 118 74.361595 50.620  88.524570 "CLM"
FC1 VA 119 70.403698 57.702  89.290118 "TC1"
FC1 VA 120 69.503314 59.510  90.011625 "EP2"
FC1 VA 121 62.461711 81.912  90.215195 "EP1"
FC1 VA 122 61.571897 85.730  90.105203 "SHD1"
FC1 VA 123 60.513398 91.481  90.141907 "SDWK1"
FC1 VA 124 39.161996 72.360  89.552921 "SMH"
FC1 VA 125 85.262407 115.624 90.300356 "SDWK1"
FC1 VA 126 87.264988 111.134 90.275227 "SHD1"
FC1 VA 127 88.523605 108.216 90.363391 "EP1"
FC1 VA 128 99.144607 92.422  90.241512 "EP2"
FC1 VA 129 100.155504 91.260  90.040862 "TC1"
FC1 VA 130 104.360500 86.951  89.454601 "CLM"
FC1 VA 131 109.213204 83.190  90.043274 "TC2"
FC1 VA 132 110.364910 82.353  90.271055 "EP3"
FC1 VA 133 127.241904 75.669  90.521488 "EP4"
FC1 VA 134 130.253396 75.245  90.410715 "SHD2"
FC1 VA 135 135.000000 75.007  90.461754 "SDWK2"
FC1 VA 136 140.143512 54.732  91.121426 "UP"
FC1 VA 137 135.000000 125.011 90.450605 "SDWK2"
FC1 VA 138 132.150706 125.149 90.420173 "SHD2"
FC1 VA 139 130.253396 125.413 90.484763 "EP4"
FC1 VA 140 119.470107 129.546 90.340124 "EP3"

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Survey-X.fbk:

UNIT FOOT DMS
HORIZ ANGLE RIGHT
PRISM CONSTANT 0
PRISM OFFSET 0
EDM OFFSET 0
CR OFF
ATMOS OFF
COLLIMATION OFF
JOB LWV7
!NOTE  LINEWORK DEMO
LINEWORK DEMO
SCALE FACTOR 1.000000
VERT ANGLE ZENITH
END
NE 1 5000.000   5000.000   263.650    "STA1"
NE 6 5088.000   6104.000   249.635    "STA6"
END
END
STN 1 0.000000 "STA1"
AZ 1 1000 315.000000
PRISM 0.000000
END
FC1 VA 1000 0.000000 00.000     90.000000 "AZMK"
END
FC1 VA 2 117.563300 300.023    90.421692 "STA2"
BEGIN SDWK1
FC1 VA 101 29.082602 91.481     89.454093 "SDWK1"
BEGIN SHD1
FC1 VA 102 28.024103 85.731     89.401866 "SHD1"
BEGIN EP1
FC1 VA 103 27.134289 81.910     89.495311 "EP1"
BEGIN EP2
FC1 VA 104 20.092686 59.515     89.171525 "EP2"
BEGIN TC1
FC1 VA 105 19.192302 57.714     88.440647 "TC1"
BEGIN CLM
FC1 VA 106 15.234405 50.640     88.011060 "CLM"
BEGIN TC2
FC1 VA 107 10.132014 43.849     88.193331 "TC2"
BEGIN EP3
FC1 VA 108 8.402312 42.206     88.594830 "EP3"
BEGIN EP4
FC1 VA 109 336.480464 26.931     89.292180 "EP4"
BEGIN SHD2
FC1 VA 110 328.294524 25.715     88.542934 "SHD2"
BEGIN SDWK2
FC1 VA 111 315.000000 25.003     89.074501 "SDWK2"
END
FC1 VA 112 84.000234 20.591     90.352368 "WSO"
CONT SDWK2
FC1 VA 113 135.000000 25.003     90.521499 "SDWK2"
CONT SHD2
FC1 VA 114 121.301476 25.711     90.360605 "SHD2"
CONT EP4
FC1 VA 115 113.115536 26.935     91.062236 "EP4"
CONT EP3
FC1 VA 116 81.193688 42.200     90.014753 "EP3"
CONT TC2
FC1 VA 117 79.463986 43.833     89.191297 "TC2"

......................................................................

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I have following questions to ask:

Q#1: What Point Coordinate System used in these 2 .fbk files? In the Lat.-Longs. system or the Easting-Northing system?

Q#2: Where is the origin (0,0) point for these 2 sets of the  points in the .fbk file?

Q#3: What are the grid coordinates and the ground coordinates for these 2 sets of points in these 2 fbk files?

2) If I want to create a new line (or a new building) from some "existing" points of the non-control points, how can I set up a new Figure-LineCodes in the Network of the each Survey Database?

Please kindly help, answer my questions, advise and respond.

Thanks in advance,

Scott Chang 

[Pointdump]

Scott,

From Sinc's White Paper on Coordinate Conversions:

"FBK files typically contain unit settings, but not coordinate zone settings."

"It is important to note that settings in the Transformation Tab are NOT applied to survey data being imported into the Survey Database via a FBK file."

So whatever Coordinate System you have set in Drawing Settings is what those points represent.

Dave

[KirkNoonan]

Your fbk files are in an assumed coordinate system. You can tell by the 'NE' lines which establish the control points (STA1 and STA6) for the rest of the observations. These statements set those points at the coordinates shown. STA1 is set at 5000, 5000 which is a very typical location to start at if the crew is working in assumed coordinates. The coordinates are in northing - easting, thus the NE at the beginning of the line. If you have "real" coordinates for those points, you can modify them in the Control Points section of your network, and the whole network will move to the new reference location.

If you want to create a new figure, right-click on Figures in the database and select Add New. Follow the prompts on the command line.

[scottchang]

Hi Kirk and Dave, Thanks for your nice responses.

One more question to ask you:  Where can I find the specifications of the FBK file for importing into AutoCAD Civil 3D 2013? Please kindly reply.

Thanks in advance,

Scott Chang

[KirkNoonan]

These two documents are probably installed on your computer in versions that match your Civil 3D. Search the help for Survey Command Language and also for Field to Finish.

http://docs.autodesk.com/CIVIL/2010/ENU/AutoCAD%20Civil%202010%20User%20Documentation/index.html?url...

http://docs.autodesk.com/CIV3D/2013/ENU/index.html?url=filesCUG/GUID-00ABBF25-B6DB-470B-A180-CC12849...