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342 - GEOSPATIAL REFERENCE DATA (R)
A description of the frame of reference for the coordinates in a data set. To work with a data set a user must be able to identify how location accuracy has been affected through the application of a geospatial reference method thus enabling the user to manipulate the data set to recover location accuracy.
Indicators
- First - Geospatial reference dimension
- 0 - Horizontal coordinate system
- 1 - Vertical coordinate system
- Second - Geospatial reference method
- 0 - Geographic
- 1 - Map projection
- 2 - Grid coordinate system
- 3 - Local planar
- 4 - Local
- 5 - Geodetic model
- 6 - Altitude
- 7 - Method specified in $2
- 8 - Depth
Subfield Codes
- $a - Name (NR)
- $b - Coordinate or distance units (NR)
- $c - Latitude resolution (NR)
- $d - Longitude resolution (NR)
- $e - Standard parallel or oblique line latitude (R)
- $f - Oblique line longitude (R)
- $g - Longitude of central meridian or projection center (NR)
- $h - Latitude of projection origin or projection center (NR)
- $i - False easting (NR)
- $j - False northing (NR)
- $k - Scale factor (NR)
- $l - Height of perspective point above surface (NR)
- $m - Azimuthal angle (NR)
- $n - Azimuth measure point longitude or straight vertical longitude from pole (NR)
- $o - Landsat number and path number (NR)
- $p - Zone identifier (NR)
- $q - Ellipsoid name (NR)
- $r - Semi-major axis (NR)
- $s - Denominator of flattening ratio (NR)
- $t - Vertical resolution (NR)
- $u - Vertical encoding method (NR)
- $v - Local planar local or other projection or grid description (NR)
- $w - Local planar or local georeference information (NR)
- $2 - Reference method used (NR)
- $6 - Linkage (NR) See Control Subfields
- $8 - Field link and sequence number (R) See Control Subfields
Examples
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01$aPolyconic$g0.9996$h0$i500 0 |
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16$aNational geodetic vertical datum of 1929 coordinates. |
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00$c0.0004$d0.0004$bDecimal degrees |
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05$sWorld geodetic system 72 |
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18$aLowest astronomical tide |
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05$aWorld Geodetic System 1984 (WGS-84)$c0.0000001$d0.0000001$bDegrees Minutes and Decimal seconds$qWorld Geodetic System 1984 (WGS-84)$r6378137.0$s298.257223563 |
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02$aUniversal Transverse Mercator$p13$k0.9996$g-105.00$h0.00$i500 0 |
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02$aState Plane Coordinate System 27 Lambert Conformal Conic$p0405$g-69.0$h0.0$i500000.0$j0.0 |
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03$vMissouri East State Plane NAD27$qClarke 1866$r6378206.4 M$s294.97869821 |
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18$aNGVD 1929 depth coordinate included with horizontal coordinates |

