InSAR Scientific Computing Environment (ISCE) Reader/Writer

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

The ISCE Reader/Writer allows FME to read and write data in the ISCE format.


ISCE files contain numerical raster data. Numeric rasters may contain up to two bands, provided all bands are the same data type and no band has a palette.

The ISCE reader and writer support multiple image types, including

  • Radar Amplitude Image
  • Digital Elevation Model
  • Complex-Valued Interferogram
  • Magnitude and Height Image
  • Raw Image
  • Single Look Complex

Each image type has a unique file extension. All image types are read automatically and the writer provides a feature type option to select the output image type. See Writer Feature Type Parameters.

The reader and writer support band data types of Byte, UInt16, Int16, UInt32, Int32, Real32, and Real64.

ISCE does not support palettes.

The reader and writer support the ISCE required fixed coordinate system LL-WGS84.

Reader Overview

The ISCE reader considers a single ISCE image file and accompanying XML file to be a dataset.

The XML file may contain well-defined metadata about the raster data including interleaving, byte order, and ISCE version, which are listed as Format Attributes.

Writer Overview

The ISCE writer considers a dataset to be a folder name. The names of the ISCE output files written to the output dataset folder are determined from the FME Feature Type. The folder does not have to exist before the translation occurs. Any existing files in the folder which have the same name are overwritten with the new feature data. The ISCE writer distinguishes duplicate output files by appending numbers to the filenames.

The ISCE writer requires a coordinate system of LL-WGS84 and will reproject incoming raster features with known coordinate systems. If incoming raster features do not know their coordinate system, the writer will return an error message. The ISCE writer requires raster feature input. Supplying the writer with features with non-raster geometry will cause the writer to return an error. The ISCE writer provides both feature type and format attribute level options to set the interleaving and image type of the output file.

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