Replaces the geometry of input raster features with a polygon covering the extents of the raster.
Parameters
Extents Type
Raster Extents: The polygon covers the entire extents of the raster. If the raster is rotated, the rotated corners of the raster are used for the polygon.
Data MBR Extents and Data Extents: These modes examine the data in the raster to more accurately determine the extents. A cell is considered to be nodata when, for each selected band, the value for that cell is equal to that band's nodata value. If any cell value is not equal to that band's nodata value, the cell will be considered data. In these modes, this transformer will only operate on selected raster bands, and each selected band is required to have a nodata value.
In Data MBR Extents mode, the polygon will be an axis-aligned bounding rectangle that covers all data cells in the raster. This is more computationally expensive than finding the Raster Extents.
In Data Extents mode, the output geometry will be either a single polygon or an aggregate of polygons that exactly cover only the data cells in the raster. This is more computationally expensive than finding the Data MBR Extents.
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.
Transformer Categories
FME Licensing Level
FME Professional edition and above
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Tags Keywords: raster grid band channel vector spatial extent extract polygon vectorisation vectorization nodata footprint