ERDAS RAW Reader/Writer

Licensing options for this format begin with FME Desktop Professional Edition.

The reader enables FME to read a binary raw raster file with an associated ERDAS .raw header file, with or without an Esri world file. The writer enables FME to output a binary raw raster file and an associated ERDAS .raw header file, along with an Esri world file.

Overview

An ERDAS® .raw file is a header file that stores the properties of an associated raw raster file.

The georeferencing information is read from or written to an Esri world file and some properties are stored in the .raw file with the following keywords.

For each raster, there is only a single feature returned, since this feature will contain the entire raster.

Note: The current version of ERDAS RAW Reader/Writer does not support the LAYER_SKIP_BYTES, RECORD_SKIP_BYTES, TILE_WIDTH and TILE_HEIGHT directives.

Since the reader does not read the PIXEL_FILES directive, the reader always assumes that the raw binary file is the dataset, and the name of this file is the name of the header without the extension. Currently, the reader does not support multiple raw binary files in one dataset or a single file with both the header and the raw binary data at the same time.

Reader Overview

FME considers a single binary ERDAS RAW file associated with a header file to be a dataset. The ERDAS RAW file contains pixel data, and each pixel in the file is a point in a single FME raster feature. The header file contains the raster properties.

Writer Overview

The ERDAS RAW writer creates and writes data into a single folder specified by the Dataset parameter.

The ERDAS RAW file contains pixel data: each pixel in the file is a point in a single FME raster feature. The ERDAS RAW writer distinguishes duplicate output files by appending numbers to the filenames.

FME Raster Features

FME raster features represent raster data and use several concepts that are unlike those used in the handling of vector data. The topics below describe how FME processes raster data.

About FME Rasters Tiling and Mosaicking
Raster Properties Band Combining and Separating
Band Properties Band and Palette Selection
Palette Properties Raster Processing
Compression Raster versus Vector Features
Pyramiding Raster File Naming
Interleaving World Files
Interpretation and Data Type TAB Files
Palette Resolution  

ERDAS Raw supports rasters with an arbitrary number of bands, provided all bands are the same data type and no band has a palette.