burst ID syntax

[yunjunz]

The current syntax for the unique burst ID is t{trackNum}s{subSwathNum}b{burstNum}. How about changing it to the following?

T{trackNum}{acquisitionMode}{subSwathNum}B{burstNum}

where {acquisitionMode} can be IW (by default), EW, WV and SM (https://sentinels.copernicus.eu/web/sentinel/user-guides/sentinel-1-sar/acquisition-modes). Since the mode string is upper case, we could use upper case for T and B as well; or all lower case also works.

We should use the same syntax in isce-framework/s1-reader#1.

[LiangJYu]

Assuming file naming convention is consistent across all modes, then this is automatically accounted for here. Removing iw here and in the comments would also be required.

[yunjunz]

The current burst ID calculation depends on the duration of each burst, thus, I don't think it's applicable to other Sentinel-1 modes. Saying that, the current unique burst ID syntax is perfectly fine. Close this issue.