Intergraph Raster

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File Format
Name Intergraph Raster
Ontology
Extension(s) .cot, .cit, .rle, .rgb, others
PRONOM x-fmt/229
Released ~1986

Intergraph Raster (INGR) is a raster graphics format associated with geospatial products from Intergraph.

Some sources mention a bi-level format named Intergraph File Format, Intergraph, IntergraphRLE, or ITG. It's not clear whether this refers to a particular type of INGR file, or to an entirely different file format.

Intergraph Raster is apparently distinct from Intergraph Standard File Formats (ISFF) [1].

Contents

Identifiers

One source gives the following "partial listing" of INGR file extensions: .cot, .ctc, .rgb, .ctb, .grd, .crl, .tpe, .lsr, .rle, .cit, .g3, .g4, .tg4, .cmp, .jpg.

XnView also gives .itg.

LEADTOOLS also gives .t27, .t29.

PRONOM gives .ing.

Identification

The documentation implies that all INGR files begin with 0x08 0x09.

Specifications

  • Intergraph Raster File Format (from archive.org)
  • Intergraph Raster File Format Reference (formerly at ftp://ftp.intergraph.com/pub/bbs/scan/note/rffrgps.zip)

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