I can say that this is the first time I have heard a request for this format. I could create a feature request. Can you tell me more about how you are using this format or do any major data distributors use it?

Instead of doing mosaics written to file you can use a virtual raster which is basically a text file (similar to envi .series files) point to the actual data files. In this case is the mosaic 75000 x 75000 pixels (10 bands) and then it is handy not to create a new huge file.
ARCGIS PRO and QGIS open thee file without problem
/
Jonas


Example:

PROJCS["BU MEaSUREs Lambert Azimuthal Equal Area - AF - V01",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433]],PROJECTION["Lambert_Azimuthal_Equal_Area"],PARAMETER["latitude_of_center",5],PARAMETER["longitude_of_center",20],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]]]
9.8773000000000000e+05, 1.0000000000000000e+01, 0.0000000000000000e+00, -4.2795000000000000e+04, 0.0000000000000000e+00, -1.0000000000000000e+01

NEAREST



61838.77250940034,87682.03391390214,119528.3322053163,144786.0439623834,187107.592191568,208485.4482169376,222320.168272171,236497.696574106,284298.2178249336,210742.9626043507

10146
273.10607440413
-433
1
1
248.67402861859

-9999
Gray


-433
10146
256
1
0

Sure, it is much like the ENVI meta file:
http://www.harrisgeospati...teENVIMetaFiles.html

I created a feature request for this: ENVI-72128