POSC Specifications
Version 2.2.2		 Epicentre Standard Values
ref_coordinate_transformation_parameter

ref_coordinate_transformation_parameter

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Standard Instance Values

name description ref _parameter _attribute source version status
    ref _parameter _attribute .name ref _source .name ref _epicentre _version .name  
longitude of natural origin The longitude of the projection origin. The projection origin is the point of definition of an orthogonal grid constructed on a map projection. Where the longitude of false origin is not given as a parameter, the grid coordinate value corresponding to the longitude of natural origin is defined by the false easting. location POSC 2.2 current
latitude of natural origin The latitude of the projection origin. The projection origin is the point of definition of an orthogonal grid constructed on a map projection. Where the latitude of false origin is not given as a parameter, the grid coordinate value corresponding to the latitude of natural origin is defined by the false northing. any quantity POSC 2.2 current
scale factor at natural origin The factor by which the map grid is reduced or enlarged during the projection process. any quantity POSC 2.2 current
false easting The value of the easting assigned to the projection origin. Easting values increase to the east. any quantity POSC 2.1 current
false northing The value of the northing assigned to the projection origin. Northing values increase to the north. any quantity POSC 2.1 current
latitude of first standard parallel For a conic projection with two standard parallels, this is the latitude of intersection of the cone with the ellipsoid that is nearest the pole. any quantity POSC 2.1 current
latitude of second standard parallel For a conic projection with two standard parallels, this is the latitude of intersection of the cone with the ellipsoid that is furthest from the pole. any quantity POSC 2.1 current
latitude of false origin The longitude of false origin, latitude of false origin give the graticular coordinate system point for which the false easting and false northing are defined. any quantity POSC 2.1 current
longitude of false origin The longitude of false origin, latitude of false origin give the graticular coordinate system point for which the false easting and false northing are defined. location POSC 2.1 current
easting at false origin The longitude of false origin, latitude of false origin give the graticular coordinate system point for which the false easting and false northing are defined. any quantity POSC 2.1 current
northing at false origin The longitude of false origin, latitude of false origin give the graticular coordinate system point for which the false easting and false northing are defined. any quantity POSC 2.1 current
latitude of projection center Latitude of a point on the central line of an oblique projection, which serves as the origin of the projected coordinate system. It will have map grid coordinates of easting and northing at the projection center. any quantity POSC 2.1 current
longitude of projection center Longitude with respect to the prime meridian of a point on the central line of an oblique projection, which serves as the origin of the projected coordinate system. It will have map grid coordinates of easting and northing at the projection center. location POSC 2.1 current
easting at projection center The easting value of the projection center. It increases in the graticular easterly direction. any quantity POSC 2.1 current
northing at projection center The northing value of the projection center. It increases in the graticular northerly direction. any quantity POSC 2.1 current
azimuth of initial line The azimuthal direction (north zero, east of north being positive) of the great circle which is the center line of an oblique projection. The azimuth is given at the projection center. any quantity POSC 2.2 current
angle from rectified to skew grid   any quantity POSC 2.2 current
scale factor on initial line The factor by which scale distances are decreased or enlarged at the projection center. any quantity POSC 2.2 current
longitude rotation The amount by which the longitude is increased, remaining within the -180 to +180 degree branch cut. any quantity POSC 2.2 current

ref_coordinate_transformation_parameter

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name description ref _parameter _attribute source version status
x-axis translation The amount the x value is increased: x(new) = x(old) + x-axis translation. It is generally applied in and R3--> R3 geocentric transformation. any quantity POSC 2.2 current
y-axis translation The amount the y value is increased: y(new) = y(old) + y-axis translation. It is generally applied in and R3--> R3 geocentric transformation. any quantity POSC 2.2 current
z-axis translation The amount the z value is increased: z(new) = z(old) + z-axis translation. It is generally applied in and R3--> R3 geocentric transformation. any quantity POSC 2.2 current
semi-major axis length difference a(old)-a(new), where a is the length of the semi-major axis of the ellipsoid. any quantity POSC 2.2 current
flattening difference f(old) - f(new), where f is the flattening of the ellipsoid. any quantity POSC 2.2 current
x-axis rotation In an orthogonal (or affine) transformation, the rotation about the x (first) axis as viewed from the origin looking along the axis. The particular method defines which direction is positive, and what is being rotated (point or axis). any quantity POSC 2.2 current
y-axis rotation In an orthogonal (or affine) transformation, the rotation about the y (second) axis as viewed from the origin looking along the axis. The particular method defines which direction is positive, and what is being rotated (point or axis). any quantity POSC 2.2 current
z-axis rotation In an orthogonal (or affine) transformation, the rotation about the z (third) axis as viewed from the origin looking along the axis. The particular method defines which direction is positive, and what is being rotated (point or axis). any quantity POSC 2.2 current
vertical offset The value of the origin of vertical coordinate system 2 in vertical coordinate system 1. any quantity POSC 2.2.1 current
scale difference The scale factor - 1.0. Usually given in parts per mission. any quantity POSC 2.2 current
ordinate 1 of source evaluation point The x (first ordinate) value of the source evaluation point. any quantity POSC 2.2 current
ordinate 2 of source evaluation point The y (second ordinate) value of the source evaluation point. any quantity POSC 2.2 current
ordinate 1 of target evaluation point The x (first ordinate) value of the target evaluation point. any quantity POSC 2.2 current
ordinate 2 of target evaluation point The y (second ordinate) value of the target evaluation point. any quantity POSC 2.2 current
ax The x coefficient of the first ordinate in a 2d affine or R2-->R2 polynomial transformation. any quantity POSC 2.2 current
ay The y coefficient of the first ordinate in a 2d affine or R2-->R2 polynomial transformation. any quantity POSC 2.2 current
bx The x coefficient of the second ordinate in a 2d affine or R2-->R2 polynomial transformation. any quantity POSC 2.2 current
by The y coefficient of the second ordinate in a 2d affine or R2-->R2 polynomial transformation. any quantity POSC 2.2 current
axx The x squared coefficient for the first ordinate in an R2-->R2 polynomial transformation. any quantity POSC 2.2 current
axy The x*y coefficient for the first ordinate in an R2-->R2 polynomial transformation. any quantity POSC 2.2 current

ref_coordinate_transformation_parameter

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name description ref _parameter _attribute source version status
ayy The y squared coefficient for the first ordinate in an R2-->R2 polynomial transformation. any quantity POSC 2.2 current
bxx The x squared coefficient for the second ordinate in an R2-->R2 polynomial transformation. any quantity POSC 2.2 current
bxy The x*y coefficient for the second ordinate in an R2-->R2 polynomial transformation. any quantity POSC 2.2 current
byy The y squared coefficient for the second ordinate in an R2-->R2 polynomial transformation. any quantity POSC 2.2 current
axxx The x cubed coefficient for the first ordinate in an R2-->R2 polynomial transformation. any quantity POSC 2.2 current
axxy The x squared y coefficient for the first ordinate in an R2-->R2 polynomial transformation. any quantity POSC 2.2 current
axyy The x y squared coefficient for the first ordinate in an R2-->R2 polynomial transformation. any quantity POSC 2.2 current
ayyy The y cubed coefficient for the first ordinate in an R2-->R2 polynomial transformation. any quantity POSC 2.2 current
bxxx The x cubed coefficient for the second ordinate in an R2-->R2 polynomial transformation. any quantity POSC 2.2 current
bxxy The x squared y coefficient for the second ordinate in an R2-->R2 polynomial transformation. any quantity POSC 2.2 current
bxyy The x y squared coefficient for the second ordinate in an R2-->R2 polynomial transformation. any quantity POSC 2.2 current
byyy The y cubed coefficient for the second ordinate in an R2-->R2 polynomial transformation. any quantity POSC 2.2 current
axxxx The x fourth coefficient for the first ordinate in an R2-->R2 polynomial transformation. any quantity POSC 2.2 current
axxxy The x cubed y coefficient for the first ordinate in an R2-->R2 polynomial transformation. any quantity POSC 2.2 current
axxyy The x squared y squared coefficient for the first ordinate in an R2-->R2 polynomial transformation. any quantity POSC 2.2 current
axyyy The x y cubed coefficient for the first ordinate in an R2-->R2 polynomial transformation. any quantity POSC 2.2 current
ayyyy The y fourth coefficient for the first ordinate in an R2-->R2 polynomial transformation. any quantity POSC 2.2 current
bxxxx The x fourth coefficient for the second ordinate in an R2-->R2 polynomial transformation. any quantity POSC 2.2 current
bxxxy The x cubed y coefficient for the second ordinate in an R2-->R2 polynomial transformation. any quantity POSC 2.2 current
bxxyy The x squared y squared coefficient for the second ordinate in an R2-->R2 polynomial transformation. any quantity POSC 2.2 current

ref_coordinate_transformation_parameter

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name description ref _parameter _attribute source version status
bxyyy The x y cubed coefficient for the second ordinate in an R2-->R2 polynomial transformation. any quantity POSC 2.2 current
byyyy The y fourth coefficient for the second ordinate in an R2-->R2 polynomial transformation. any quantity POSC 2.2 current
version For describing a software program, the version is the version number of the software being used. string POSC 2.1 current
filename For describing a file that has been used as input to a software transformation program. string POSC 2.2 current
row count For a general affine transformation, this is the number of rows in the transformation matrix. The number of rows is equivalent to the dimension of the output vector. integer POSC 2.1 current
column count For a general affine transformation, this is the number of columns in the transformation matrix. The number of columns is equivalent to the dimension of the input vector. integer POSC 2.1 current
a11 For a general matrix transformation, this is the value in the first row, first column of the matrix: y = Ax + b. any quantity POSC 2.1 current
a12 For a general matrix transformation, this is the value in the first row, second column of the matrix: y = Ax + b. any quantity POSC 2.1 current
a13 For a general matrix transformation, this is the value in the first row, third column of the matrix: y = Ax + b. any quantity POSC 2.1 current
a21 For a general matrix transformation, this is the value in the second row, first column of the matrix: y = Ax + b. any quantity POSC 2.1 current
a22 For a general matrix transformation, this is the value in the second row, second column of the matrix: y = Ax + b. any quantity POSC 2.1 current
a23 For a general matrix transformation, this is the value in the second row, third column of the matrix: y = Ax + b. any quantity POSC 2.1 current
a31 For a general matrix transformation, this is the value in the third row, first column of the matrix: y = Ax + b. any quantity POSC 2.1 current
a32 For a general matrix transformation, this is the value in the third row, second column of the matrix: y = Ax + b. any quantity POSC 2.1 current
a33 For a general matrix transformation, this is the value in the third row, third column of the matrix: y = Ax + b. any quantity POSC 2.1 current
b1 For a general matrix transformation, this is the first element of the vector, b: y = Ax + b. any quantity POSC 2.1 current
b2 For a general matrix transformation, this is the second element of the vector, b: y = Ax + b. any quantity POSC 2.1 current
b3 For a general matrix transformation, this is the third element of the vector, b: y = Ax + b. any quantity POSC 2.1 current
a The coefficient of the variable in a 1d affine transformation: ax + b any quantity POSC 2.1 current
b The shift value in a 1d affine transformation: ax + b any quantity POSC 2.1 current

ref_coordinate_transformation_parameter

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name description ref _parameter _attribute source version status
element removed For an identity transformation that reduces the dimension by 1, this represents the element of the vector that is removed (1, 2, 3, etc.) integer POSC 2.1 current
element kept For an identity transformation that reduces the dimension to 1, this represents the element of the vector that is kept. If it increases the dimension from 1, this represents the element of the output vector that is nonzero. integer POSC 2.1 current
zero inserted For an identity transformation that increases the dimension by 1, this represents the element of the output vector for which a zero is inserted. integer POSC 2.1 current
latitude difference gridded binary file The NADCON file that contains the gridded latitude data. string POSC 2.2.2 current
longitude difference gridded binary file The NADCON file that contains the gridded longitude data. string POSC 2.2.2 current
longitude of origin Deprecated. Use longitude of natural origin. location POSC 2.2 deprecated
latitude of origin Deprecated. Use latitude of natural origin. any quantity POSC 2.2 deprecated
scale factor at origin Deprecated. Use scale factor at natural origin. any quantity POSC 2.2 deprecated
azimuth of initial line at proj center Deprecated. Use azimuth of initial line any quantity POSC 2.2 deprecated
scale factor at proj center Deprecated. Use scale factor on initial line. any quantity POSC 2.2 deprecated
rotation x Deprecated. Use x-axis rotation. any quantity POSC 2.2 deprecated
rotation y Deprecated. Use y-axis rotation. any quantity POSC 2.2 deprecated
rotation z Deprecated. Use z-axis rotation. any quantity POSC 2.2 deprecated
scale increment Deprecated. Use scale difference. any quantity POSC 2.2 deprecated
coefficient a Deprecated. Use ax. The a coefficient in the affine transformation x' = a*x + b*y +c; y' = d*x + e*y +f; where (x',y') is the new value. any quantity POSC 2.2 deprecated
coefficient b Deprecated. Use ay. The b coefficient in the affine transformation x' = a*x + b*y +c; y' = d*x + e*y +f; where (x',y') is the new value. any quantity POSC 2.2 deprecated
coefficient c Deprecated. Use x-axis translation. The c coefficient in the affine transformation x' = a*x + b*y +c; y' = d*x + e*y +f; where (x',y') is the new value. any quantity POSC 2.2 deprecated
coefficient d Deprecated. Use bx. The d coefficient in the affine transformation x' = a*x + b*y +c; y' = d*x + e*y +f; where (x',y') is the new value. any quantity POSC 2.2 deprecated
coefficient e Deprecated. Use by. The e coefficient in the affine transformation x' = a*x + b*y +c; y' = d*x + e*y +f; where (x',y') is the new value. any quantity POSC 2.2 deprecated
coefficient f Deprecated. Use y-axis translation. The f coefficient in the affine transformation x' = a*x + b*y +c; y' = d*x + e*y +f; where (x',y') is the new value. any quantity POSC 2.2 deprecated

ref_coordinate_transformation_parameter

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name description ref _parameter _attribute source version status
delta x Deprecated. Use x-axis translation. any quantity POSC 2.2 deprecated
delta y Deprecated. Use y-axis translation. any quantity POSC 2.2 deprecated
delta z Deprecated. Use z-axis translation. any quantity POSC 2.2 deprecated

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