Can anyone help me merge remote sensing and ground based Aeronet data of Aerosol optical depth using Geostatical fusion method?
Dear Singh
I am similar to Geostatistics models such as Kriging, co-kriging, ...
These method are OK for you? if yes, then i could help you
Best
First of all thank you so much
Yes, I want to use Krigiing method, please explain the steps of Fusion.
Thanking you
Raj kumar singh
Dear Singh
you can use of Geostatistics tool in ArcGIS or some geostatistics softwares such as GS+ 5.1 - Software.
i cant explain steps one-by-one...
you search on these tools, they have a good help.
Best
Thank you sir
It will be very helpful, I will explore the proper steps.
regards
Raj Kumar singh
@ Felix, Thanks for this interesting paper. Can we use the MODIS-derived spectral albedo at e.g. 550nm or your "critical surface albedo" to correct the large AOD bias in MODIS retrievals over reflective surfaces, like arid areas over the southwest US? The bias in MODIS AOD is often considerable there (typically in the 100-400% range). In my experience, MISR behaves better, but still has a large bias. Over darker surfaces, MODIS performs better than MISR, again in my experience.
So my question is, what can we do to correct this problem? Data fusion is one potential solution, but there are not many Aeronet stations where we need them most for this purpose.
Another question is about the temporal overlap issue you mention.I agree with you if the purpose is to evaluate an instantaneous AOD. But in many applications, what we aim for is daily, or even just monthly, AOD. It is then impossible to perfectly synchronize the observations and MODIS L3 aggregated products. What would you suggest?
Felix, Thanks for your interesting discussion.
Regarding the aerosol transport models, I have been using the MACC reanalysis (2003-2012), whose model is constrained by MODIS obs. On paper, this is a good solution. So far, however, its accuracy appears relatively poor, particularly over the problem regions--precisely because it uses MODIS obs that are biased in the first place.
There are other models too (like GOCART), but in general I found that their accuracy is poor compared to satellite obs.
Do you think there could be a correlation between the MODIS-observed albedo at 550 nm and the bias in its AOD derivation at that wavelength? Do you anticipate an improvement with Collection 6?
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