Bounding Box Issue using L1/2 browser

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dsgrimmer
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Bounding Box Issue using L1/2 browser

by dsgrimmer » Thu Mar 30, 2023 2:19 pm America/New_York

Hi, I'm looking into the effectiveness of different satellites of capturing ocean color at local scales. I've been creating spatial subsets in SeaDAS to get a closer view at local coastlines. However, even when using the exact same geospatial coordinates, sometimes the bounding box does not represent the same area. I'm attaching an image for context. The change was more gradual than shown here, but this just represents the extreme. The first is accurate, and as I went through images (I'm going chronologically) the change became more apparent. Does anyone have an idea of why this might occur? Please let me know, thanks!

Dorothy Sue Grimmer
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OB SeaDAS - xuanyang02
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Re: SeaDAS Spatial Subset Issue

by OB SeaDAS - xuanyang02 » Fri Mar 31, 2023 11:26 am America/New_York

Are you asking a question concerning the bounding box issue with the subsetting or a question about the gradual change of chlor_a of the Hawkeye data as you asked in the other posts? -- viewtopic.php?t=4080

As I mentioned in the other posts, it's helpful that you provide the file names and attach the images instead of PDF files...

dsgrimmer
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Re: SeaDAS Spatial Subset Issue

by dsgrimmer » Sat Apr 01, 2023 7:13 pm America/New_York

Hi! This is separate from the chlorophyll pattern I mentioned in another post. I'm talking about an issue with the bounding box here. I can't attach the images as they are .nc files, but I'm going to include links to the images I got from the Ocean Color website. Does this work?

29-09-2021
https://oceancolor.gsfc.nasa.gov/cgi/browse.pl?sub=level1or2&per=DAY&day=18899&prm=TC&set=10&mon=18871&sen=hawk&rad=0&frc=0&all=1&id=1680390648.3518424&cn=90&cs=-90&cw=-180&ce=180&dnm=D&file=SEAHAWK1_HAWKEYE.20210929T183752.L1A.nc_BRS_BRS&ndx=0&wid=450&hgt=1484

04-09-2022
https://oceancolor.gsfc.nasa.gov/cgi/browse.pl?sub=level1or2&per=DAY&day=19239&prm=TC&set=10&mon=19236&sen=hawk&rad=0&frc=0&all=1&id=1680390732.3572039&cn=90&cs=-90&cw=-180&ce=180&dnm=D&file=SEAHAWK1_HAWKEYE.20220904T183758.L1A.nc_BRS_BRS&ndx=0&wid=450&hgt=1484

Please let me know if you need a different type of file. Thank you so much for your help!

Dorothy Sue Grimmer

OB SeaDAS - xuanyang02
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Re: Bounding Box Issue using L1/2 browser

by OB SeaDAS - xuanyang02 » Wed Apr 05, 2023 2:28 pm America/New_York

The link you provided shows nothing. Judging from the parameters in the link, your search returns two scenes -

SEAHAWK1_HAWKEYE.20210929T183752.L1A.nc
SEAHAWK1_HAWKEYE.20210929T183752.L2.OC.nc (You probably downloaded L2 files)

SEAHAWK1_HAWKEYE.20220904T183758.L1A.nc
SEAHAWK1_HAWKEYE.20220904T183758.L2.OC.nc

L1/2 browser is not mapped. When you enter the coordinates for the bounding box, the browser will return scenes that meet the search criteria. Those scenes will not have the exact coordinates of the bounding box you provided.

dsgrimmer
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Re: Bounding Box Issue using L1/2 browser

by dsgrimmer » Fri Apr 07, 2023 3:01 pm America/New_York

That helps, thanks!

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