original reduced grid (N80)

octahedral reduced grid (O80)regular grid (F80)
Total number of grid points357182848051200
Resolution at equator
(lat-lon)
1.125°1.125°1.125°
Resolution at equator (km)125125125
Average resolution (km)120134100
  • 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 \( \sqrt{4 \pi R^{2}_{\mbox{earth}}/N_{p}} \)

    km, where \( N_{p} \) is the total number of grid points.

 

latitude numberreduced points
(original - N80)
reduced points
(octahedral - O80)

regular points
(full - F80)

latitude
1182032089.141519
2252432088.029429
3362832086.910771
4403232085.790629
5453632084.669924
6544032083.548947
7604432082.427818
8644832081.306595
9725232080.185310
10725632079.063982
11806032077.942624
12906432076.821243
13966832075.699844
141007232074.578432
151087632073.457008
161208032072.335576
171208432071.214136
181288832070.092690
191359232068.971240
201449632067.849784
2114410032066.728326
2215010432065.606864
2316010832064.485399
2416011232063.363932
2518011632062.242462
2618012032061.120991
2718012432059.999518
2819212832058.878044
2919213232057.756569
3020013632056.635092
3120014032055.513614
3221614432054.392135
3321614832053.270655
3421615232052.149175
3522515632051.027694
3622516032049.906212
3724016432048.784729
3824016832047.663246
3924017232046.541763
4025617632045.420279
4125618032044.298794
4225618432043.177309
4325618832042.055824
4428819232040.934338
4528819632039.812852
4628820032038.691366
4728820432037.569880
4828820832036.448393
4928821232035.326906
5028821632034.205418
5128822032033.083931
5228822432031.962443
5330022832030.840955
5430023232029.719467
5530023632028.597979
5630024032027.476491
5732024432026.355002
5832024832025.233514
5932025232024.112025
6032025632022.990536
6132026032021.869047
6232026432020.747558
6332026832019.626069
6432027232018.504580
6532027632017.383091
6632028032016.261601
6732028432015.140112
6832028832014.018622
6932029232012.897133
7032029632011.775643
7132030032010.654153
723203043209.532664
733203083208.411174
743203123207.289684
753203163206.168194
763203203205.046704
773203243203.925215
783203283202.803725
793203323201.682235
803203363200.560745
81320336320-0.560745
82320332320-1.682235
83320328320-2.803725
84320324320-3.925215
85320320320-5.046704
86320316320-6.168194
87320312320-7.289684
88320308320-8.411174
89320304320-9.532664
90320300320-10.654153
91320296320-11.775643
92320292320-12.897133
93320288320-14.018622
94320284320-15.140112
95320280320-16.261601
96320276320-17.383091
97320272320-18.504580
98320268320-19.626069
99320264320-20.747558
100320260320-21.869047
101320256320-22.990536
102320252320-24.112025
103320248320-25.233514
104320244320-26.355002
105300240320-27.476491
106300236320-28.597979
107300232320-29.719467
108300228320-30.840955
109288224320-31.962443
110288220320-33.083931
111288216320-34.205418
112288212320-35.326906
113288208320-36.448393
114288204320-37.569880
115288200320-38.691366
116288196320-39.812852
117288192320-40.934338
118256188320-42.055824
119256184320-43.177309
120256180320-44.298794
121256176320-45.420279
122240172320-46.541763
123240168320-47.663246
124240164320-48.784729
125225160320-49.906212
126225156320-51.027694
127216152320-52.149175
128216148320-53.270655
129216144320-54.392135
130200140320-55.513614
131200136320-56.635092
132192132320-57.756569
133192128320-58.878044
134180124320-59.999518
135180120320-61.120991
136180116320-62.242462
137160112320-63.363932
138160108320-64.485399
139150104320-65.606864
140144100320-66.728326
14114496320-67.849784
14213592320-68.971240
14312888320-70.092690
14412084320-71.214136
14512080320-72.335576
14610876320-73.457008
14710072320-74.578432
1489668320-75.699844
1499064320-76.821243
1508060320-77.942624
1517256320-79.063982
1527252320-80.185310
1536448320-81.306595
1546044320-82.427818
1555440320-83.548947
1564536320-84.669924
1574032320-85.790629
1583628320-86.910771
1592524320-88.029429
1601820320-89.141519

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