Data and Resources

SEVIRI Images, Products & Time Series (data courtesy of Eumetsat)

Data Availability

SEVIRI data over the RADAGAST region were collected from 1st December 2005 (when the ARM Mobile Facility started operating in Niamey), through to 11th January 2007 (when the AMF facility was decommissioned). Data for March 2004 and for part of March 2005 were also collected in support of dust event studies. Missing data within these date ranges are listed here.

SEVIRI sensor bands are at 3km resolution, except for HRV (1km), and are acquired every 15 minutes:

Visible: 0.6, 0.8µm and HRV (High Resolution Visible)
Near-IR: 1.3µm
IR: 3.4, 6.2, 7.3, 8.7, 9.7, 10.8, 12.0 & 13.4µm

Products

Greyscale images of individual bands at full resolution
Cloud Mask images (created by SAFNWC, Météo France), at full resolution
Scene Analysis (aka EUMETSAT Cloud Analysis Image, created by SAFNWC, Météo France) images at 9km resolution, generated at 3 hour intervals starting at 00:00.
Derived products, formed by linear combinations of SEVIRI bands into colour images, at 6km resolution
Daily time series of individual bands (including cloud mask) over the Niamey and Banizoumbou AMF sites and also the BSRN sites at Tamanrasset (Algeria), University of Ilorin (Nigeria), and Djougou (Benin)
Special Dust and Pseudo Visible products covering the region (approx. 9E to 21.5E, 9N to 21N) surrounding the Bodele Depression. These are full resolution subsets, browsable as a montage.

Individual Bands

Cloud Mask

Scene Analysis

Site Time Series

Dust Product

Pseudo Visible Product

Water Vapour Product

Split Window Product

Notes

All dates/times are in UTC
SEVIRI image/product times are ~ 2min 20 sec earlier than nominal acquisition times
Browse tools require Javascript and reasonably up to date web browers
For on-line help with the browse tools click on the '?' button, located top right in each browser window
Browse tools are cross-linked so that users may switch between products for the same date/time
The Dust Product is generated from the IR 8.7, 10.8 & 12.0 µm bands using the Eumetsat dust product algorithm
The Pseudo Visible Product is generated by mapping the 1.3µm (near-IR) channel onto red, 0.6µm onto green and 0.8µm onto blue using a EUMETSAT algorithm
The Water Vapour Product is generated by mapping the brightness temperature difference between the 6.2 µm and 7.3 µm bands onto the red and blue channels and the 6.2 µm value onto green, using a EUMETSAT algorithm
The Split Window Product is generated by mapping the brightness temperature difference between the 10.8 µm and 12.0 µm bands onto the red and blue channels and the 10.8 µm value onto green

Ancillary Datasets/Images (resampled onto SEVIRI grid)

Topographic reference image (from ETOPO2 dataset): monochrome 6km resolution | colour 6km resolution
World Vector Shoreline coastline image: monochrome 6 km resolution | colour 6km resolution
World Vector Shoreline country borders image: monochrome 6 km resolution | colour 6 km resolution
Five degree graticule image: monochrome 6 km resolution

SEVIRI Imagery & Time Series

GERB Imagery & Time Series

Daily AMF Profiles

Notable Events

GERB

Data Availability

Data over the RADAGAST region will be collected for all of 2006 (and well into 2007) as and when they are generated.
Version 3 ARG and HR data are received via ftp from RMIB in near-real time, with about 1 to 2 hours latency.
Edition 1 ARG data (quality controlled Version 3 data) are received from GGSPS, with about 40 days latency.

Products

Greyscale images of ARG products re-sampled onto SEVIRI image grid
Greyscale images of High Resolution products (generated from SEVIRI and ARG data), also re-sampled onto SEVIRI image grid
Resolution at nadir ~40-45 km (ARG), ~9km (HR)
Short-wave: 0.6-5µm
Long-wave: 5 - 15µm
Archived by year/month/day
Daily Time Series, starting at 00:00 UTC, covering the Niamey and Banizoumbou AMF sites and BSRN sites at Tamanrasset (Algeria), University of Ilorin (Nigeria), and Djougou (Benin)
ARG time series are generated from 5 by 5 ~45 km ARG pixels centred on the closest ARG pixel to the site
HR time series are generated from 5 by 5 ~6 km High Resolution pixels centred on the closest HR pixel to the site

ARG Product

High Resolution Hybrid Product

Daily Time Series

Notes

All dates/times are in UTC
GERB image/product times vary by up to ±7.5 minutes from nominal acquisition times
'Latest' image times are ~2 hours later than current time
Browse tools require Javascript and reasonably up to date web browers
For on-line help with the browse tools click on the '?' button, located top right in each browser window
Browse tools are cross-linked so that users may switch between all products for the same date/time

The following links give the status of the data reception process and completeness of the GERB archive:

Backlog - data expected up to current date/time but not yet received, listed by date/time
Absent - data not acquired up to current date/time, listed by date/time

SEVIRI Imagery & Time Series

GERB Imagery & Time Series

Daily AMF Profiles

Notable Events