Section 3 - Template 2 : Stretched Latitude/longitude (or equidistant cylindrical, or Plate Carree)
Templates for Section 3
More Sections
| Octets | Key | Type | Content |
| 15-72 | Same as Grid Definition Template 3.0 (see Note 1) | ||
| 73-76 | latitudeOfThePoleOfStretching | signed | Latitude of the pole of stretching |
| 77-80 | longitudeOfThePoleOfStretching | signed | Longitude of the pole of stretching |
| 81-84 | stretchingFactorScaled | unsigned | Stretching factor |
| 85-nn | pl | unsigned | List of number of points along each meridian or parallel (These octets are only present for quasi-regular grids as described in note 3) |
( 1) Basic angle of the initial production domain and subdivisions of this basic angle are provided to manage cases where the recommended unit of 10-6 degrees is not applicable to describe the extreme longitudes and latitudes, and direction increments. For these last six descriptors, unit is equal to the ratio of the basic angle and the subdivisions number. For ordinary cases, zero and missing values should be coded, equivalent to respective values of 1 and 106 (10-6 degrees unit).
( 2) The stretching is defined by three parameters:
(a) The latitude in degrees (measured in the model coordinate system) of the "pole of stretching";
(b) The longitude in degrees (measured in the model coordinate system) of the "pole of stretching"; and
(c) The stretching factor C in units of 10-6 represented as an integer. The stretching is defined by representing data uniformly in a coordinate system with longitude Y and latitude X1, where:
X1 = sin-1 ( (1-C2)+(1+C2)sinX ) / ( (1+C2)+(1-C2)sinX) )
and Y and X are longitude and latitude in a coordinate system in which the "pole of stretching" is the northern pole. C = 1 gives uniform resolution, while C > 1 give enhanced resolution around the pole of stretching.
( 3) See Note (3) under Grid Definition Template 3.0.