Section 3 - Template 31 : Albers equal area

Templates for Section 3

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Octets Key Type Content
15 shapeOfTheEarth codetable Shape of the earth (see Code Table 3.2)
16 scaleFactorOfRadiusOfSphericalEarth unsigned Scale factor of radius of spherical earth
17-20 scaledValueOfRadiusOfSphericalEarth unsigned Scaled value of radius of spherical earth
21 scaleFactorOfMajorAxisOfOblateSpheroidEarth unsigned Scale factor of major axis of oblate spheroid earth
22-25 scaledValueOfMajorAxisOfOblateSpheroidEarth unsigned Scaled value of major axis of oblate spheroid earth
26 scaleFactorOfMinorAxisOfOblateSpheroidEarth unsigned Scale factor of minor axis of oblate spheroid earth
27-30 scaledValueOfMinorAxisOfOblateSpheroidEarth unsigned Scaled value of minor axis of oblate spheroid earth
31-34 Nx unsigned Nx - number of points along the X-axis
35-38 Ny unsigned Ny - number of points along the Y-axis
39-42 latitudeOfFirstGridPoint signed La1 - latitude of first grid point
43-46 longitudeOfFirstGridPoint unsigned Lo1 - longitude of first grid point
47 resolutionAndComponentFlags codeflag Resolution and component flags (see Flag table 3.3)
48-51 LaD signed LaD - Latitude where Dx and Dy are specified
52-55 LoV unsigned LoV - Longitude of meridian parallel to Y-axis along which latitude increases as the Y- coordinate increases
56-59 Dx unsigned Dx - X-direction grid length (see Note 1)
60-63 Dy unsigned Dy - Y-direction grid length (see Note 1)
64 projectionCentreFlag codeflag Projection centre flag (see Flag table 3.5)
65 scanningMode codeflag Scanning mode (see Flag table 3.4)
66-69 Latin1 signed Latin 1 - first latitude from the pole at which the secant cone cuts the sphere
70-73 Latin2 unsigned Latin 2 - second latitude from the pole at which the secant cone cuts the sphere
74-77 latitudeOfTheSouthernPoleOfProjection signed Latitude of the southern pole of projection
78-81 longitudeOfTheSouthernPoleOfProjection unsigned Longitude of the southern pole of projection
Notes:

( 1) Grid lengths are in units of 10-3 m, at the latitude specified by LaD.

( 2) If Latin 1 = Latin 2, then the projection is on a tangent cone.

( 3) The resolution flags (bits 3-4 of Flag table 3.3) are not applicable

( 4) LoV is the longitude value of the meridian which is parallel to the Y-axis (or columns of the grid) along which latitude increases as the Y-coordinate increases (the orientation longitude may or may not appear on a particular grid).

( 5) A scaled value of radius of spherical Earth, or major or minor axis of oblate spheroid Earth is derived from applying appropriate scale factor to the value expressed in metres.