This is the native file format used by Intergraph software applications to store raster data. 1-128-bit colour. Each INGR file contains a single header composed of two more subheaders called Header Blocks. Each Header Block is exactly 512 bytes in length and an INGR file may contain as many Header Blocks as necessary to provide a proper interpretation of the raster data. Three major versions of the INGR file format exist. Versions 1 and 2 always have only two header blocks, and therefore always contain a header 1024 bytes in length. The version 3 file header contains two or more header blocks, and therefore may vary in length starting at 1024 bytes and increasing in increments of 512 bytes. See Figure INGR-1.
http://oreilly.com/www/centers/gff/formats/ingr/index.htm
The following is a partial listing of INGR file extensions:
| .cot | 8 -bit grayscale or color table data |
| .ctc | 8-bit grayscale using PackBits-type compression (uncommon) |
| .rgb | 24-bit color and grayscale (uncompressed and PackBits-type compression) |
| .ctb | 8-bit color table data (uncompressed or run-length encoded) |
| .grd | 8, 16 and 32 bit elevation data |
| .crl | 8 or 16 bit, run-length compressed grayscale or color table data |
| .tpe | 8 or 16 bit, run-length compressed grayscale or color table data |
| .lsr | 8 or 16 bit, run-length compressed grayscale or color table data |
| .rle | 1-bit run-length compressed data (16-bit runs) |
| .cit | CCITT G3 or G4 1-bit data |
| .g3 | CCITT G3 1-bit data |
| .g4 | CCITT G4 1-bit data |
| .tg4 | CCITT G4 1-bit data (tiled) |
| .cmp | JPEG grayscale, RGB, or CMYK |
| .jpg | JPEG grayscale, RGB, or CMYK |
See full list of Dataset Formats
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