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I see. Thanks so much, Sean.
-brian

Looking at the files to download from the Level-3 browser.  For search parameters: MODIS/A, Chlorophyll concentration, monthly climatology, 4km, mission date range. These are the files returned for download:https://oceandata.sci.gsfc.nasa.gov/cgi/getfile/A20022442018273.L3m_MC_CHL_chlor_a_4km.n...

Perfect! Thanks, Sean.
-brian

Any advice on getting getanc.py to run for S2A MSI L1C? I get an error with this command - seahawk 222 :/tmp/brian_port_miami4766/D2018011T17RNJ/S2A_MSIL1C_20180111T160501_N0206_R054_T17RNJ_20180111T174508.SAFE> getanc.py ./manifest.safe Traceback (most recent call last):  File "/optics1/s...

Thanks again Danny. That's just what I needed to know!If I duplicate the bowtie logic, the answer I get from pyresample is the same as the GPT output for the area near the scan edge. Yay! Note I tried the GPT/pyresample comparison for the region you proposed at the center of the image. The pyres...

Thanks Danny.I tried at ~8km resolution - same xml as above, but using:         <pixelSizeX>0.072727272</pixelSizeX>         <pixelSizeY>0.072727272</pixelSizeY>Again, the outputs of Nearest, Bilinear, and Bicubic are identical (at least to floating ...

Thanks Danny. Given a bilinear grid size of 2x2, I'm not that surprised that there's no difference between the Nearest and Bilinear. However, I would expect some difference from Bicubic (4x4 grid) - even for a footprint at the scan edge (a 4 x 4 grid would cover 1km x 1km, which is bigger th...

I'm trying to decipher what happens under the hood of the GPT Mosaic and Reproject routines (SeaDAS 7.4).Here's what I've done that's got me to the point of totally confused: Start with A2016316180000.L1A_LAC -> modis_GEO.py -> modis_L1A_extract.py (24 to 26 Lat, -83 to -80 Lon) -> m...

Exactly what I needed. Thanks, Sean and Bryan.
-brian

Bryan-Yes, that's very helpful. Thank you.So in practice, l2gen will use the timestamp to determine which field within the xcalfile is needed. This xcal dataset (168x2) is then interpolated to 1354x2. Then, for any given pixel, l2gen will extract the pixel number/mframe and line number/nscan fro...