Difference between revisions of "GridLocation"

cornerPoints

[DMF/Data]

Earth location of the cells at opposite ends of grid coverage along two diagonals in the grid spatial dimensions, in the coordinate system defined by the Spatial Reference System and the grid coordinate. There are four corner points in a georectified grid; at least two corner points along one diagonal are required. The first corner point corresponds to the origin of the grid. The coordinates corresponds to the centre of the pixel.

The grid coordinate of any node P is noted P.indice[i] along the axis number i (i goes from 1 to the number of axisDimension properties). P.indice[i] goes from 1 to axisDimensionProperties[i].dimensionSize. When the orientation of the geographic coordinate axis matches the orientation of the grid axis, a single corner Point P1 can be expressed. The geographic coordinates of any node P follows this formula P.coordinate[i] = P1.coordinate[i] + axisDimensionProperties[i].resolution * (indice[i]-1). When the axis orientation does not match, 2 corner points are needed the formula becomes: P.coordinate[i] = ( P1.coordinate[i] * ( axisDimensionProperties[i].dimensionSize - indice[i] ) + (indice[i]-1) * P2.coordinate[i] ) / (axisDimensionProperties[i].dimensionSize-1)

crs

[DMF/Data]

CRS of the corner points expressed as a URI.

Example: http://www.opengis.net/def/crs/EPSG/0/4326