Field Name | Datatype | CDCS name | NOTE: |
Angle_err_est | Numeric | none | Allows angles to be calculated then used in the adjustment with an angle_err_est. Format for value is A DD.MMSSss, appended to Bearing_Type in SID file, Ex: BT:GA 0.0530. |
Direction_correction | Numeric | none | Constant to be applied to each measurement to achieve truer representation of direction. This would be applied when the correction has been validated. Format: DD.MMSSss GMM example: BC:-0.0025 means move 25 seconds in counter-clockwise direction |
Direction_err_est | Numeric | none | This is the estimate of the direction (bearing|azimuth) error. Seconds units. |
Direction_type | String | units of measure link -> direction type | Basis of bearing or basis of azimuth. GMM values: BT:M (mean), BT:F (forward), BT:G (grid), BT:C (compass/magnetic) or BT:L (local/assumed). CDCS values: Assumed, Astronomic North, Astronomic South, Geodetic North, Geodetic South, magnetic North, Magnetic South, free text, unkown |
Distance_correction | String | none | Constant and ppm Multiplier to be applied to each measurement to achieve truer representation of distance. This would be applied to a surveyor is known to have used a short|long steel tape or out-of-adjustment EDM. GMM example: DC:-.05 +1.03 means subtract .05 from distance then multiply result by 1.03. |
Distance_err_est_constant | Numeric | none | This is the estimate of the distance error irrespective of line length, feet units |
Distance_err_est_PPM | Numeric | none | This is the estimate of the distance error that is based on the line distance. Parts Per Million. |
Distance_type | Char | units of measure link -> distance type | Describes reference surface for the distance. Allowable GMM values: DT:G (ground), DT:E (ellipsoid), or DT:P (plane/grid) |
Distance_unit | Numeric | units of measure link -> distance unit | In GMM, codes are F, I, M and C to represent survey feet, international feet, meters and chains. A more flexible system would store the divisor to convert current units to a baseline unit such as survey feet. Ex: survey feet = 1.0, chains = 66, and meters = 3.2808333. |
Lat_measurement_err_est | Numeric | none | This field is irrelevant and has never been implemented. |
Long_measurement_err_est | Numeric | none | This field is irrelevant and has never been implemented. |
SID_code | Char | n/a | An "S" in the first column denotes a line with Survey_ID and error values. A "C" in the first column denotes free text comments, although some lines contain standard formats. |
SID_suffix | String | none, see notes. | Additional categorization of lines, appended to Survey_ID. On alphanumeric Survey IDs, a hyphen delimits the ID with the suffix. Standard values BLM-wide: - TIE used on non-boundary lines. Denotes invisibility in coverage. Connector Line
- LC means Long Chord of curve. Denotes invisibility in coverage. None
- RP follows Long Chord entry. Invisible line segment to Radius Point. None
- PBLT Protracted Bearing Line True, an example of a line in an Amended Protraction Diagram. None
There are often arbitrary user-assigned values that separate out different areas within a survey that have differing reliabilities. Ex. 7123-A, 7123-B. Note: In GMM nomenclature the "SID number" refers to both the Survey_ID and SID_suffix. |
Survey_ID | String | source link | Unique alphanumeric identifier that identifies a particular source document for brg/dists There are only local standards for these values. There can be several values for any given survey. |
>