Reprojects feature coordinates from one coordinate system to another using the Grid InQuest reprojection library. This library allows you to use the GridInQuestReprojector to transform coordinates between ETRS89 (WGS84) and the national coordinate systems of Great Britain, Northern Ireland and the Republic of Ireland.
This transformer always reprojects from the source coordinate system to the destination coordinate system, tagging the features with the destination coordinate system on output. Any coordinate system set on the input features is ignored.
Parameters
Source Coordinate System
The name of the source coordinate system
Source Vertical Datum
Choose a vertical datum from the list.
Destination Coordinate System
Choose the destination coordinate system.
Destination Vertical Datum
Choose a vertical datum from the list.
Interpolation Type (Raster Only)
The Interpolation Type affects only raster data. Cell values are interpolated in order to change the raster to the specified size.
- Nearest Neighbor is the fastest but produces the poorest image quality.
- Bilinear provides a reasonable balance of speed and quality.
- Bicubic is the slowest but produces the best image quality.
- Average 4 and Average 16 have a performance similar to Bilinear and are useful for numeric rasters such as DEMs.
Cell Size (Raster Only)
The Cell Size applies only to raster features.
- Stretch Cells: The cell size of the raster will be adjusted to maintain the same number of rows and columns in the reprojected raster as there were in the input raster.
- Square Cells: The number of rows and columns as well as the spacing will be changed to maintain approximately the same cell ground area and form square cells where the horizontal and vertical cell sizes are equal.
- Preserve Cells: Like the Square Cells option, this option will change both the number of rows and columns and the spacing to maintain cell ground area, but will also try to preserve the original cell aspect ratio, taking into account any warping caused by the reprojection.
Tolerance (cells) (Raster Only)
Sets the tolerance, in cells, for approximating cell locations for raster reprojection.
If a value of 0.0 is specified, every cell location in the raster will be reprojected. This is the default.
If a value > 0.0 is specified, rather than reprojecting every single cell location in the raster, some cell locations will be approximated. The difference between an approximated cell location and the true cell location should be at most the tolerance value. For example, if a value of 0.5 is specified, each approximated cell location should be at most half a pixel away from its true location. Specifying a value > 0.0 may improve performance.
Usage Notes
The GridInQuestReprojector is supported on the 32-bit Windows edition of FME only. The GridInQuestIIReprojector is supported on both 32-bit and 64-bit Windows edition of FME.
This transformer is unaffected by raster band and palette selection.
Editing Transformer Parameters
Using a set of menu options, transformer parameters can be assigned by referencing other elements in the workspace. More advanced functions, such as an advanced editor and an arithmetic editor, are also available in some transformers. To access a menu of these options, click 
beside the applicable parameter. For more information, see Transformer Parameter Menu Options.
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Tags Keywords: reproject resample upsample downsample raster grid band channel "nearest neighbor" "nearest neighbour" bilinear bicubic average interpolate cell pixel "coordinate system" coordsys "spatial reference" srid georeference