ACOLITE forum

Hi Philippe Do you think the turbidity is high enough to warrant the use of the NIR band for the retrieval? Looking at the spectra derived from Sentinel-2 it seems that in addition to glint effects there is also a vegetation red-edge signal in the river, which originates from land adjacency. I will ...

Hi Erick Indeed the rhot variables represent the top-of-atmosphere reflectance, i.e. the ratio of radiance measured by the sensor to the (modeled) extraterrestrial solar irradiance, and a factor pi over the cosine of the sun zenith angle. The rhos is the surface level reflectance, i.e. after atmosph...

Hi Philippe This indeed looks like sun glint. For higher latitudes this occurs during summer months, and the patterns occur because of local differences in the water surface roughness. You can try the SWIR based glint correction integrated in ACOLITE. With no correction: S2A_MSI_2023_08_04_15_30_07_...

Hi Philippe I could manage to get the ancillary download working for the latest Windows binary by creating a .netrc file in my home directory with the following: machine earthdata login YOUR_LOGIN password YOUR_PASSWORD The config or settings methods may not be working if there is a hash # in either...

Hi Philippe I have tested here on Windows 10 and it seems that indeed none of the methods specifying the EARTHDATA credentials (i.e. netrc, settings, config) are working for the latest binary version. It could be that I made a mistake in the packages included in this binary release. Were you using t...

Hi Graeme If you could share the data that would be the most efficient way for me to troubleshoot! I think for WorldView subsetting is currently only supported if the input data are in a geographic projection. If they are not there is an option to attempt a reprojection with "worldview_reprojec...

Hi Graeme For the commercial sensors I don't always have many scenes available for testing. If you could share via email your specific input bundle for testing/development purposes I can take a look at it specifically. In this case there seem to be two potential issues in your settings file: 1) you ...

This post shows some examples of query and download of VIIRS data. VIIRS data are distributed as L1B and GEO files that can be directly processed by ACOLITE. The function will download both geometry and radiance data files for both I (375 m) and M (750 m) bands that can be used in ACOLITE processing...

This post shows some examples of query and download of PACE_OCI data. You can query based on a sensor, date and location. Currently only querying for a single lon/lat point is supported. This function will return the urls and scene names. Note that start_date and end_date can be specified with/witho...

I have implemented a simple query and download function for the EarthData API to get VIIRS and OCI L1B data. To use the EarthData portal please make an account at https://urs.earthdata.nasa.gov/ and put your credentials in your .netrc file: machine urs.earthdata.nasa.gov login YOUR_LOGIN password YO...