Advice on accessing extracted data: many years of L2 MODIS-A chlorophyll
Posted: Wed Apr 10, 2019 9:59 am America/New_York
I have a subscription for MODIS-A images of chlorophyll concentration from ocean color (the L2 product) which I receive by email (and also have retrieved from the http server). The images are extracted for a relatively small area (Massachusetts Bay).
The images are useful, but I would like to be able to access the L2 data values (and ideally the quality flags for them) underlying what is shown in each image.
I have many past years of images, and would like to access the underlying data for all of them. So I need to be able to do this via scripting-- an image browsing tool does not seem like a suitable solution.
Any suggestions for viable ways to accomplish this goal would be appreciated.
I understand that I could set up my subscription for images to also include data files. But this is only possible for images from now onward. And I would like the data from images of many past years.
Ideally I could access the data using OpenDAP or ERDDAP, in order to easily subset it to the small ___domain I am interested in. But so far I have been unable to find L2 data available in that way. (I see some L3 products are available via OpenDAP, but they don’t have the high resolution I need.) Is it correct that this is not possible for L2 data? Are there any plans to make L2 data available via OpenDAP/ERDDAP or equivalent? If so is there any anticipated timeline for them?
Barring access by OpenDAP/ERDDAP or equivalent as an option, I understand that I could use SeaDAS. But is SeaDAS really the only possibility?
And a final question, about using SeaDAS, if I pursue that: is there any anticipated timeline for when the “science data processing code” will be included in the Windows version?
The images are useful, but I would like to be able to access the L2 data values (and ideally the quality flags for them) underlying what is shown in each image.
I have many past years of images, and would like to access the underlying data for all of them. So I need to be able to do this via scripting-- an image browsing tool does not seem like a suitable solution.
Any suggestions for viable ways to accomplish this goal would be appreciated.
I understand that I could set up my subscription for images to also include data files. But this is only possible for images from now onward. And I would like the data from images of many past years.
Ideally I could access the data using OpenDAP or ERDDAP, in order to easily subset it to the small ___domain I am interested in. But so far I have been unable to find L2 data available in that way. (I see some L3 products are available via OpenDAP, but they don’t have the high resolution I need.) Is it correct that this is not possible for L2 data? Are there any plans to make L2 data available via OpenDAP/ERDDAP or equivalent? If so is there any anticipated timeline for them?
Barring access by OpenDAP/ERDDAP or equivalent as an option, I understand that I could use SeaDAS. But is SeaDAS really the only possibility?
And a final question, about using SeaDAS, if I pursue that: is there any anticipated timeline for when the “science data processing code” will be included in the Windows version?
