The rotation point is the top left corner of the top left cell of the raster. Note that a different rotation from the x and y axes produces a shear. The y rotation is the angle in radians as measured in a counterclockwise direction from the negative y axis. The x rotation is the angle in radians as measured in a counterclockwise direction from the positive x axis. Rotation is used to represent rasters that are not aligned with the x and y axes. The minimum x and maximum y values that comprise the upper left corner of the raster extents are equivalent to the raster origin. This is sometimes referred to as cell bounded. A cell origin of 0.5 in x and 0.5 in y would put the data point for each cell in the center of the cell, which is the default representation in FME.Įxtents or bounds for a raster are represented by the lower left ground coordinate and the upper right coordinate covered by the raster data. The lower left corner of the cell in the x or y dimension is 0.0, while the upper right corner is 1.0. Specifically, the raster origin in FME is the upper left corner of the upper left cell in the raster.Ĭell origin is the point within each cell of a raster from which the pixel for that cell is derived. The raster origin is the upper left x and y of the raster at which the coverage of the data sample begins. Some formats store only one spacing value, meaning that it must be the same for both the x and y dimensions – this is often referred to as square cells. Spacing or cell size is the fixed distance in the x and y dimensions between each pixel in the raster. number of rows and columns (lines and pixels)Ī cell is the rectangular area created in the x and y dimensions by the spacing of pixels from the raster origin.Rasters contain a set of metadata that defines the properties for the raster as a whole.

Raster x