110:, the cells are approximately "square" only adjacent to the equator, and become progressively narrower and tapered (also with curved northern and southern boundaries) as they approach the poles, and cells adjoining the poles are unique in possessing three faces rather than four. Each of the 540 10°x10° squares is allocated a unique number from 1 to 288 and from 300 to 551 (see image to the right), plus the sequence extends to 936 in higher latitudes; individual squares can also be subdivided into 100 one-degree squares numbered from 00 to 99 in order to improve precision.
31:
129:
However the rules for allocating numbers to squares do not follow a consistent pattern, so that reverse-engineering (decoding) the relevant square boundaries from any particular
Marsden Square identifier is not particularly straightforward (a look-up table is probably the simplest in practice).
105:
On the plate carrée projection the grid cells appear square, although if the
Mercator projection is used, the grid cells appear "stretched" vertically nearer the tops and bottoms of the map. On the actual surface of the
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126:(WMO). The 10°x10° square identifiers typically use a minimal number of characters (between 1 and 3 digits) which was/is an operational advantage for low bandwidth transmission systems.
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515:
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Slightly confusingly, an alternative (and more consistent), four-digit notation for global 10°x10° squares is actually known as
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567:
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317:
90:
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191:
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62:
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617:
424:
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97:, for collecting and combining geographically based information about the oceans.
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Marsden squares have mostly been used for identifying the geographic position of
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17:
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85:) into grid cells of 10° latitude by 10° longitude, each with a
27:
System dividing part of a world map into a grid of 10°×10° cells
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137:
but does not seem to be actively promoted by the WMO itself.
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data, and are described further in various publications of the
162:. Longman, Green, Longman, Roberts, & Green. p. 49.
89:, a unique numeric identifier. The method was devised by
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The
Weather Book: A Manual of Practical Meteorology
93:(b. 1754, d. 1836), when first secretary of the
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8:
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135:World Meteorological Organization squares
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156:"Chapter IV ... Between 1800 and 1850"
7:
25:
176:Example chart at Ocean Teacher’s
124:World Meteorological Organization
420:Military Grid Reference System
404:International Map of the World
1:
488:Ordnance Survey National Grid
473:(north-east Atlantic region)
568:ITU-T country calling codes
482:National Topographic System
477:Irish grid reference system
471:ICES Statistical Rectangles
45:is a system that divides a
634:
573:ITU-T mobile calling codes
591:Maidenhead Locator System
539:United Kingdom post codes
154:Fitzroy, Robert (1863).
59:plate carrée projection
528:New Zealand post codes
35:
524:(Republic of Ireland)
511:Australian post codes
33:
222:Administrative codes
178:Ocean Geography
101:Structure and design
34:A Marsden Square map
563:ITU-R country codes
533:Postal Index Number
595:Historical :
430:Open Location Code
265:MARC country codes
36:
605:
604:
497:
496:
425:Natural Area Code
355:FIFA country code
345:Aircraft prefixes
318:IANA country code
300:ICAO airport code
295:IATA airport code
229:FIPS country code
95:British Admiralty
16:(Redirected from
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372:
350:IOC country code
261:(United Kingdom)
241:FIPS county code
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57:gridlines (e.g.
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546:(United States)
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406:indexing system
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247:FIPS state code
235:FIPS place code
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215:Geocode systems
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91:William Marsden
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171:External links
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120:meteorological
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77:latitudes (or
39:Marsden square
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18:Marsden Square
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583:Amateur radio
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310:Country codes
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287:Airport codes
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503:Postal codes
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37:
597:QRA locator
455:WMO squares
368:place codes
231:(FIPS 10-4)
41:mapping or
450:what3words
394:Geohash-36
323:ISO 3166-1
249:(FIPS 5-2)
243:(FIPS 6-4)
141:References
69:) between
555:Telephony
440:UN/LOCODE
384:C-squares
270:SGC codes
259:GSS codes
237:(FIPS 55)
55:longitude
47:world map
618:Geocodes
612:Category
544:ZIP Code
522:Eircodes
518:(Brazil)
484:(Canada)
464:Regional
365:Geodesic
272:(Canada)
63:Mercator
51:latitude
535:(India)
410:Mapcode
389:Geohash
338:numeric
333:alpha-3
328:alpha-2
276:UN M.49
87:geocode
399:GEOREF
376:Global
108:globe
67:other
49:with
490:(UK)
435:QDGC
278:(UN)
255:(EU)
253:NUTS
180:page
83:80°S
81:and
79:90°N
75:70°S
73:and
71:80°N
516:CEP
445:UTM
114:Use
65:or
614::
158:.
61:,
207:e
200:t
193:v
53:-
20:)
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