Landsat_17Apr2005.dat
This is a portion of a Landsat Thematic Mapper (TM) satellite image covering New Haven, CT

The scene has 800 rows, 800 columns, and 6 bands (or layers) of data.
The data type is 8-bit integer (byte).
Data are stored band sequentially, beginning at the upper left corner

Landsat_17Apr2005.hdr
This is the ASCII based header file ENVI uses to open the satellite image