In the L1B2 products, why are the block dimensions different for some cameras and bands?
Most of the time that MISR is acquiring Earth imagery it operates in a configuration called Global Mode, which allows the spatial resolution to be set for each individual channel (there are 36 channels on MISR: 4 bands at each of 9 angles). Currently Global Mode is defined to provide 275-m resolution data in all bands of the An (nadir) camera and in the red band of all the off-nadir cameras (this is the highest resolution available and is called 1×1 data since it involves no on-board pixel averaging). In the remaining channels 4 samples x 4 lines are averaged within the instrument to create a 4×4, or 1.1-km resolution sample. In the L1B2 product, 1×1 data map to a 2048×512 array, whereas 4×4 data map to a 512×128 array. Thus, samples 1-4 in lines 1-4, for example, in 2048×512 data correspond on the SOM grid to the same location as sample 1, line 1, in a 512×128 array.
