original reduced grid (N48)

octahedral reduced grid (O48)regular grid (F48)
Total number of grid points132801094418432
Resolution at equator
(lat-lon)
1.875°1.875°1.875°
Resolution at equator (km)210210210
Average resolution (km)196216166
  • The lat-lon resolution at the equator is given by 90o/N where N is the number of Gaussian latitudes between the pole and equator.
  • The resolution in kilometres at the equator is given by ~10000/N km (assuming a circumference of the earth of ~40000 km).

  • The average resolution is given by √(4 π R2 / Np) km, where R is the radius of the earth and Np the total number of grid points.

 

latitude numberreduced points
(original - N48)
reduced points
(octahedral - O48)

regular points
(full - F48)

latitude
1202019288.572169
2252419286.722531
3362819284.861970
4403219282.998942
5453619281.134977
6504019279.270559
7604419277.405888
8604819275.541061
9725219273.676132
10755619271.811132
11806019269.946081
12906419268.080991
13966819266.215872
141007219264.350730
151087619262.485571
161208019260.620396
171208419258.755209
181208819256.890013
191289219255.024808
201359619253.159595
2114410019251.294377
2214410419249.429154
2316010819247.563926
2416011219245.698694
2516011619243.833459
2616012019241.968220
2716012419240.102979
2818012819238.237736
2918013219236.372491
3018013619234.507243
3118014019232.641994
3218014419230.776744
3319214819228.911492
3419215219227.046239
3519215619225.180986
3619216019223.315731
3719216419221.450475
3819216819219.585219
3919217219217.719962
4019217619215.854704
4119218019213.989446
4219218419212.124187
4319218819210.258928
441921921928.393669
451921961926.528409
461922001924.663150
471922041922.797890
481922081920.932630
49192208192-0.932630
50192204192-2.797890
51192200192-4.663150
52192196192-6.528409
53192192192-8.393669
54192188192-10.258928
55192184192-12.124187
56192180192-13.989446
57192176192-15.854704
58192172192-17.719962
59192168192-19.585219
60192164192-21.450475
61192160192-23.315731
62192156192-25.180986
63192152192-27.046239
64192148192-28.911492
65180144192-30.776744
66180140192-32.641994
67180136192-34.507243
68180132192-36.372491
69180128192-38.237736
70160124192-40.102979
71160120192-41.968220
72160116192-43.833459
73160112192-45.698694
74160108192-47.563926
75144104192-49.429154
76144100192-51.294377
7713596192-53.159595
7812892192-55.024808
7912088192-56.890013
8012084192-58.755209
8112080192-60.620396
8210876192-62.485571
8310072192-64.350730
849668192-66.215872
859064192-68.080991
868060192-69.946081
877556192-71.811132
887252192-73.676132
896048192-75.541061
906044192-77.405888
915040192-79.270559
924536192-81.134977
934032192-82.998942
943628192-84.861970
952524192-86.722531
962020192-88.572169

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