Search found 1450 matches
- Wed Aug 02, 2017 8:03 am America/New_York
- Forum: Questions/Comments
- Question: Can't Add bathymetry and elevation bands and masks
- Replies: 6
Can't Add bathymetry and elevation bands and masks
If you are looking for a way to obtain chlorophyll concentration at various depths within the water column, that is not possible with satellite remote sensing. If you are looking to define an area based on the 250m isobath for limiting the data for your study, that is exactly why we include th...
- Tue Aug 01, 2017 3:53 pm America/New_York
- Forum: Questions/Comments
- Question: Sentinel 3A OLCI L2 data?
- Replies: 4
Sentinel 3A OLCI L2 data?
ESA has their Sentinel science data hub:
https://scihub.copernicus.eu/
L2 data from ESA was made available last month. I found some on the "S3 PreOps Hub"...
Sean
https://scihub.copernicus.eu/
L2 data from ESA was made available last month. I found some on the "S3 PreOps Hub"...
Sean
- Tue Aug 01, 2017 11:48 am America/New_York
- Forum: Questions/Comments
- Question: Sentinel 3A OLCI L2 data?
- Replies: 4
Sentinel 3A OLCI L2 data?
Matt,Our current funding only supports the distribution of the L1B data for Sentinel-3 OLCI. We have a proposal in to provide funding for processing and distribution of L2 and above, and are awaiting the response from those who control the purse strings. That said, the processing capabil...
- Mon Jul 31, 2017 7:44 pm America/New_York
- Forum: Questions/Comments
- Question: Refined subscription NRT mixing
- Replies: 1
Refined subscription NRT mixing
Stephen,While scratching our heads over this one, we surmise that there is a race condition involved. As refined files are generated they are checked to see if they match any active subscriptions.If so, a record in a table for that subscription is updated. The new file replaces the old i...
- Fri Jul 28, 2017 3:45 pm America/New_York
- Forum: Questions/Comments
- Question: sea level correction at atmospheric correction
- Replies: 2
sea level correction at atmospheric correction
Slava,
Yes, the height of the water body is accounted for in our data processing. An adjustment to the Rayleigh correction is made based on the lake surface height relative to mean sea level. Yes, ALL mission we support are so corrected.
Regards,
Sean
Yes, the height of the water body is accounted for in our data processing. An adjustment to the Rayleigh correction is made based on the lake surface height relative to mean sea level. Yes, ALL mission we support are so corrected.
Regards,
Sean
- Fri Jul 28, 2017 3:42 pm America/New_York
- Forum: Questions/Comments
- Question: Atmospheric correction for NIR-Red bands of MODIS
- Replies: 4
Atmospheric correction for NIR-Red bands of MODIS
The source data are available from our L1/2 browser. For MODIS, you would need to process the L1A data to produce an L1B and geolocation file to input into l2gen for processing. SeaDAS is the software of choice :grin: However, we do not yet support data processing under the W...
- Thu Jul 27, 2017 6:57 pm America/New_York
- Forum: Questions/Comments
- Question: l2gen resolution 250 m
- Replies: 6
l2gen resolution 250 m
Cassandra,
The resolution is only a nominal resolution at nadir. Off nadir, the pixels will grow. For example, a 1km nominal pixel is more like 2x5 km at the edge of the swath.
Sean
The resolution is only a nominal resolution at nadir. Off nadir, the pixels will grow. For example, a 1km nominal pixel is more like 2x5 km at the edge of the swath.
Sean
- Thu Jul 27, 2017 8:27 am America/New_York
- Forum: Questions/Comments
- Question: Atmospheric correction for NIR-Red bands of MODIS
- Replies: 4
Atmospheric correction for NIR-Red bands of MODIS
Mohd,The bands *are* atmospherically corrected.The default atmospheric correction approach uses the NIR bands (748 and 869nm for MODIS), and so we do not report Rrs for the bands used in the aerosol determination in our standard products. However, you can process the data to return the Rrs val...
- Thu Jul 27, 2017 7:47 am America/New_York
- Forum: Questions/Comments
- Question: l2gen resolution 250 m
- Replies: 6
l2gen resolution 250 m
Casandra, The 1km resolution bands will not magically obtain a higher resolution when processed at 250m. The only bands that will truly be at 250m are the 645 and 859nm bands.The others will interpolated (but effectively be supersampled) to 250m resolution and will appear blockier than the nat...
- Thu Jul 27, 2017 7:27 am America/New_York
- Forum: Questions/Comments
- Question: L1B problems
- Replies: 14
L1B problems
You can use the Band Properties option to set the spectral wavelength for the bands manually (right click on the band in the File Manager tab to select the Properties GUI).
Once you have set the wavelengths, the Spectrum View GUI will identify the data as capable of being displayed.
Regards,
Sean
Once you have set the wavelengths, the Spectrum View GUI will identify the data as capable of being displayed.
Regards,
Sean