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HRPT dish and G-5500 rotator system


MSG-1 MPE RSS Animation dated 10th. January 2009 ........ Click on image for animation ........ Original imagery is copyright of EUMETSAT


Animations of European Meteosat Imagery with "Bracknell"* MSLP Isobaric chart overlay

and equivalent processing of NOAA Goes imagery

dated 14th. February 2008

Original imagery is copyright of EUMETSAT and the U.K. Meteorological Office, and NOAA NESDIS

Data reception, and image processing with software produced by David. J. Taylor

A more detailed article on the methodology has just been published in the March 2008 Quarterly Journal No.17 of the Group for Earth Observation (GEO)

The licensed MSG HRIT data mainly affords images at 15 minute intervals, whilst the "Bracknell" charts are six-hourly.


Four areas of data processing for Mean Sea Level Pressure chart overlain images are covered on this page

INFRARED Meteosat Ch.09 .....VISIBLE Meteosat Ch.01 .......MPE (Precipitation) .....INFRARED NOAA GOES (G12)

preceded by a brief rundown of settings used within the GSS software for the IR Ch.09 imagery


The large IR image of the first frame of the animation below is of the approach of the depression which brought severe gales to the Southern U.K. in mid March 2008. The animation was compiled by GSS -

"GeoSatSignal" - version 6.1.2 (6/12/07)

- the "job" set-up was: MSG-1 (Meteosat 8) Channel 09 IR

GENERAL: 'Refresh' is here set to the Meteosat present minimum of 15 minutes (note that when the Rapid Scan Service - RSS - returns later in 2008 this may be set at 5 mins), otherwise a setting of a minimum of 60 minutes will be required if the hourly data from GOES is processed. If, e.g., 360 minutes is selected, and six-hourly images are processed from either Goes or Meteosat then the overlay will of course advance with each image.

PROCESSING: False colour - Normal; Brightness adjust - Histo equalise (or 'Stretch' - to taste); Crispen - None; Space - White;

.......................................Vis channel - LUTLLandSea-zw2 (modified);

REMAPPING - 1024 x 768 (automatic & required with Bracknell Mean Sea Level Pressure [MSLP] Chart Overlay) Polar Stereographic projection

ANIMATION: running with 200 frames at 5 minute RSS intervals, 'cache' checked, uncompressed and not 'smoothed'.

...................................''Frames per second' should be set as required.

ANNOTATION: Country boundaries are enabled using a green colour similar to the land mask.

This accentuates the basic black outlines of the.Bracknell MSLP overlay.


Other example images, and smaller animation files, follow below.

A comparatively high resolution representative .WMV animation/file (9,000kb) is available by clicking the image below.

This approx. 3 minute download will display the exceptional low pressure systems transiting the U.K. between the 9th. and 12th. of March 2008 and bringing severe gales particularly to the Southern coastal areas of England. The animation's frames are advancing at 15 minute intervals, and the six-hourly Met. Office surface pressure chart overlay shifts therefore occur every 24 frames.

Alternatively, you may click here to download the original 200 frame GSS zipped full resolution .AVI animation file compressed to 19.6MB - approx. 6 minute download.

Either animation should display satisfactorily with 'Irfanview' , Windows Media Player or equivalent video viewer.

As mentioned, every 6 hours the MSLP chart overlay advances automatically with the weather -

- with a 'merging' effect over 3 frames if the 'smoothing' option is selected when animating in GSS.

NB. The original GSS filesize of the 200 frame animation, from which these reduced files are compiled, is 848 MB.


It is obviously also possible to overlay the HRIT Visible spectrum and Water Vapour imagery with Isobaric charts.

For this purpose the GeoSatSignal software permits use of weather chart overlays from many parts of the World.

These charts can be automatically downloaded to your chosen schedule with the associated Autoget programme.

Your colour palette choices are all but infinite.


More recent (Feb. 2008) indicative medium resolution 100 frame .WMV animation files are available for download/viewing by clicking the respective images below, each of which gives some idea of the variation in palettes possible with the Infra-red data.

To the left,

a 6.9 MB file, and

to the right,

a 3.5 MB file,

respectively

2 min & 1 min

downloads at normal

broadband speeds.T

........

 

Here is a visible spectrum Channel 1 image overlain with the Bracknell MSLP chart

A medium resolution 100 frame .WMV animation file of approx 3.5MB is available for download/viewing by clicking the image below.

Continuing the theme, here is an overlaid animation of the Eumetsat MPE data (Multi-Sensor Precipitation Estimate)

The first is a rather busy image, but will give an idea of what can be achieved. To produce this, it has hitherto been necessary to save and rename the received GRIB image data files as JPEG with Gribviewer, in the appropriately dated directories, prior to animating with Geosatsignal. One can, of course, utilise palettes within GSS to give image, boundary and chart colourings of your own choice.

David Taylor has only recently adapted a Beta version of his GSS software that will, in one process, convert the Grib files and animate them in the same way that the HRIT and other Jpeg files have hitherto been dealt with.

It should be noted that the MPE data does not cover the entire area of the MSLP chart; the Northern parts (upper left) are therefore clear of weather imagery. However, most of the full-disc world image is covered by this data's imagery. The example animation below has 15 minute frame advancement over approximately eight hours.

Click the single-frame image below to download/view a 2,200 kb 38 frame overnight animation

The hiccup in the overlay shift is as a result of finger-trouble

 

PROCESSING

Remapped only 1024 x768

VisCh: LutCloudTop

Country Boundaries coloured

Overlay coloured

 

 

 

An alternative display - using the Thermal False Colour GSS option (not here animated)

PROCESSING

Thermal FC checked (normal)

Stretched

Remapping 1024 x 768

Temperature Range -50 to +40

If anyone wishes to know a little more of all this, then the topic "GSS animations with Bracknell overlay" is running on the Satsignal Yahoo forum, from whence contact and queries can be made.


 

A final "Bracknell MSLP" overlain MPE image/animation, recently processed in a single stage by the trial version of GSS, is shown below. This (and following images) is from Meteosat 9 (MSG-2), the current operational Geostationary satellite.

A medium resolution 100 frame .WMV animation file of approx 3.5MB is available for download/viewing by clicking the image below.


U.S. NOAA GOES East - Infra Red and MPE Images

Below, the G12 Infra Red image overlain with the 'Mid Atlantic' chart downloaded by Autoget

A medium resolution 100 frame .WMV animation file of approx 8.4MB is available for download/viewing by clicking the image below.

and here, the MPE image with the same processing, but chart colur changed to white, for obvious reasons. The charts used on the following two images are daily midnight situations only.

A medium resolution 100 frame .WMV animation file of approx 5.8MB is available for download/viewing by clicking the image below.

 

Whilst the British Meteorological Office moved, in 2003, from Bracknell in Berkshire to its new base in Exeter, Devon, many years of general usage of the term "Bracknell", to describe Met. Office output, have led to that reference remaining to this day acceptable to all but the most pedantic; nostalgia largely holds sway.

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