The Wokingham Weather Page

AVHRR imagery is received at Wokingham using 
Orbit hardware, and is processed using David
Taylor's excellent HRPTRead software.

http://www.david-taylor.pwp.blueyonder.co.uk/


The maximum image resolution is 1km
at sub-satellite point, but decreases to 3km near
the edge of the scan. See below for an explanation
of the information contained in the file names.

Image files are in Jpeg format, and are saved at
about half compression. This reduces the file 
size by about 75%, with minimal loss of image
definition.

The satellites currently operational are NOAA16, 
NOAA12 and NOAA17. These are in polar 
sun-synchronous orbits, at about 800 km altitude.

Text and Word format files on the web page will 
contain climatological data for Wokingham:

LOG indicates monthly or annual files of daily
climatological data.

The format being adopted for naming the images will
be as follows:

YMDD-HHHH-N-LL(L)-(Q).JPG

Where:
Y = Code letter for year
M = Code letter for month
DD = day of month
HHHH = Time of image, GMT (time of closest 
approach of the satellite to nearest minute)
N = Alphabetical indicator for an image 
in a sequence of images for the same pass.
LL(L) = Location indicator, for approximate
location of image.
Q = Optional additional location indicator, 
normally N (north), E (east) etc.

The following values for LL(L) will be used :

AD = Adriatic
AF = Africa
AL = Alps
APT = Full pass at reduced resolution
ARC = Arctic
ATL = Atlantic
AZ = Azores
BAL = Balkans
BLA = Black Sea
CAN = Canaries
DK = Denmark
EU = Europe
FA = Faeroes
FR = France
GE = Germany
GRN = Greenland
IB = Iberia
IC = Iceland
IR = Ireland
IT = Italy
MA = Madeira
MED = Mediterranean
MO = Morocco
NOS = Norwegian Sea
SAH = Sahara
SCA = Scandinavia
RU = Russia
UK = United Kingdom

Additions may be made to this list from time to time.


With effect from 7th November 2002, image file name
will include information on year and month.
Two letters will be inserted at the start of the file name.
The first letter denotes the year. The second letter 
denotes the month. The two figures denote the day.

Decode:
 Year             Month
A  1992       January
B  1993       February
C  1994       March
D  1995       April
E  1996       May
F  1997       June
G  1998       July
H  1999       August
I  2000       September
J  2001       October
K  2002       November
L  2003       December
M  2004
N  2005
O  2006
P  2007
Q  2008
R  2009
S  2010

Thus, image for 1st November 2002 would have
been 01-1234-A-APT will now become
     KK01-1234-A-APT



Bernard Burton
Wokingham   30 March 2002
Updated 29 November 2002
b.j.burton@btinternet.com