QDGC shapefiles available for national and continental scale distribution

Aqdgc_logo new set of the Quarter Degree Grid Cell shapefiles has been generated. The update is global and delivers an error fix for the country level files as well as a new product – continent level files.

The QDGC shapefiles contain center lon/lat coordinates and the QDGC string for the different squares. The files are offered down to level four. For a country around the equator level four covers around 45 square kilometers with length and height a little under seven kilometres.

Read more about the use of QDGC on this page:

The calculations/export  this time took around 60 hours computer pricessing time including generation of world fishnet with the different sizes, square area calculations, assigning QDGC strings, compression and more.

The below images shows how quarter degree grid cells covers Uganda.

Since last time I have moved the files to my own server. Figured out I wanted to have statistics for the files. The naming convention in the below list is based on the ISO 3166-1 alpha-3 standard. This means that the first three letters in the files below indicate which country the file is for. UGA is for example for Uganda.

This i s a list of the continents level files:

qdgc_africa.7z0.4 MiB280
qdgc_antarctica.7z1.1 MiB144
qdgc_asia.7z1.0 MiB143
qdgc_europe.7z2.2 MiB167
qdgc_northamerica.7z1.5 MiB134
qdgc_oceania.7z1.8 MiB158
qdgc_openocean.7z3 KiB150
qdgc_southamerica.7z0.4 MiB150

Here is a list of countries level files:

Qdgc Afg.7z80 KiB171
Qdgc Ago.7z1.5 MiB148
Qdgc Alb.7z9 KiB165
Qdgc Are.7z23 KiB132
Qdgc Arg.7z0.4 MiB142
Qdgc Arm.7z11 KiB144
Qdgc Ata.7z4.4 MiB144
Qdgc Atf.7z6 KiB135
Qdgc Aus.7z0.6 MiB156
Qdgc Aut.7z22 KiB125
Qdgc Aze.7z18 KiB138
Qdgc Bdi.7z64 KiB134
Qdgc Bel.7z13 KiB139
Qdgc Ben.7z0.1 MiB141
Qdgc Bfa.7z0.3 MiB144
Qdgc Bgd.7z22 KiB126
Qdgc Bgr.7z14 KiB131
Qdgc Bhs.7z13 KiB131
Qdgc Bih.7z15 KiB123
Qdgc Blr.7z40 KiB139
Qdgc Blz.7z8 KiB143
Qdgc Bol.7z0.1 MiB129
Qdgc Bra.7z0.7 MiB130
Qdgc Brn.7z5 KiB120
Qdgc Btn.7z10 KiB126
Qdgc Bwa.7z0.8 MiB138
Qdgc Caf.7z0.5 MiB130
Qdgc Can.7z1.6 MiB127
Qdgc Che.7z10 KiB133
Qdgc Chl.7z0.2 MiB122
Qdgc Chn.7z0.9 MiB127
Qdgc Civ.7z0.4 MiB119
Qdgc Cmr.7z0.9 MiB163
Qdgc Cod.7z3.0 MiB118
Qdgc Cog.7z0.6 MiB129
Qdgc Col.7z0.1 MiB134
Qdgc Cri.7z12 KiB134
Qdgc Cub.7z39 KiB127
Qdgc Cyp.7z6 KiB151
Qdgc Cze.7z19 KiB137
Qdgc Deu.7z54 KiB134
Qdgc Dji.7z97 KiB127
Qdgc Dnk.7z17 KiB123
Qdgc Dom.7z9 KiB135
Qdgc Dza.7z2.7 MiB123
Qdgc Ecu.7z31 KiB127
Qdgc Egy.7z1.0 MiB121
Qdgc Eri.7z0.5 MiB131
Qdgc Esh.7z0.4 MiB136
Qdgc Esp.7z58 KiB128
Qdgc Est.7z12 KiB128
Qdgc Eth.7z1.0 MiB145
Qdgc Fin.7z79 KiB135
Qdgc Fji.7z0.4 MiB129
Qdgc Flk.7z7 KiB131
Qdgc Fra.7z1.2 MiB140
Qdgc Gab.7z0.2 MiB140
Qdgc Gbr.7z69 KiB123
Qdgc Geo.7z14 KiB140
Qdgc Gha.7z0.7 MiB142
Qdgc Gin.7z0.4 MiB126
Qdgc Gmb.7z35 KiB124
Qdgc Gnb.7z67 KiB117
Qdgc Gnq.7z54 KiB134
Qdgc Grc.7z30 KiB125
Qdgc Grl.7z0.6 MiB124
Qdgc Gtm.7z17 KiB130
Qdgc Guy.7z27 KiB123
Qdgc Hnd.7z21 KiB139
Qdgc Hrv.7z19 KiB136
Qdgc Hti.7z8 KiB121
Qdgc Hun.7z18 KiB137
Qdgc Idn.7z0.4 MiB131
Qdgc Ind.7z0.5 MiB130
Qdgc Irl.7z15 KiB129
Qdgc Irn.7z0.2 MiB116
Qdgc Irq.7z40 KiB120
Qdgc Isl.7z29 KiB111
Qdgc Isr.7z8 KiB119
Qdgc Ita.7z94 KiB121
Qdgc Jam.7z6 KiB125
Qdgc Jor.7z17 KiB142
Qdgc Jpn.7z90 KiB131
Qdgc Kaz.7z0.3 MiB138
Qdgc Ken.7z0.8 MiB123
Qdgc Kgz.7z29 KiB121
Qdgc Khm.7z16 KiB119
Qdgc Kor.7z12 KiB103
Qdgc KOSOVO.7z1 KiB123
Qdgc Kwt.7z8 KiB138
Qdgc Lao.7z56 KiB122
Qdgc Lbn.7z5 KiB126
Qdgc Lbr.7z0.2 MiB125
Qdgc Lby.7z2.2 MiB128
Qdgc Lka.7z12 KiB119
Qdgc Lso.7z0.1 MiB124
Qdgc Ltu.7z16 KiB102
Qdgc Lux.7z5 KiB121
Qdgc Lva.7z13 KiB119
Qdgc Mar.7z1.8 MiB129
Qdgc Mda.7z14 KiB121
Qdgc Mdg.7z0.8 MiB118
Qdgc Mex.7z0.3 MiB122
Qdgc Mkd.7z7 KiB115
Qdgc Mli.7z2.2 MiB130
Qdgc Mmr.7z0.1 MiB123
Qdgc Mne.7z7 KiB122
Qdgc Mng.7z0.1 MiB111
Qdgc Moz.7z1.2 MiB133
Qdgc Mrt.7z1.3 MiB121
Qdgc Mwi.7z0.3 MiB129
Qdgc Mys.7z66 KiB122
Qdgc Nam.7z1.2 MiB149
Qdgc Ncl.7z10 KiB121
Qdgc NCYPRUS.7z1 KiB125
Qdgc Ner.7z1.6 MiB119
Qdgc Nga.7z0.9 MiB119
Qdgc Nic.7z18 KiB127
Qdgc Nld.7z14 KiB118
Qdgc Nor.7z0.3 MiB120
Qdgc Npl.7z24 KiB125
Qdgc Nzl.7z0.1 MiB125
Qdgc Omn.7z58 KiB124
Qdgc Pak.7z0.2 MiB123
Qdgc Pan.7z13 KiB124
Qdgc Per.7z0.1 MiB131
Qdgc Phl.7z55 KiB117
Qdgc Png.7z88 KiB119
Qdgc Pol.7z36 KiB119
Qdgc Pri.7z6 KiB119
Qdgc Prk.7z25 KiB120
Qdgc Prt.7z19 KiB130
Qdgc Pry.7z47 KiB126
Qdgc Pse.7z5 KiB134
Qdgc Qat.7z6 KiB124
Qdgc Rou.7z37 KiB118
Qdgc Rus.7z5.3 MiB134
Qdgc Rwa.7z35 KiB123
Qdgc Sau.7z0.2 MiB119
Qdgc Sdn.7z1.4 MiB116
Qdgc Sen.7z0.2 MiB110
Qdgc Slb.7z27 KiB129
Qdgc Sle.7z0.2 MiB126
Qdgc Slv.7z9 KiB102
Qdgc Som.7z1.1 MiB121
Qdgc SOMALILAND.7z95 B111
Qdgc Srb.7z14 KiB128
Qdgc Ssd.7z1.1 MiB121
Qdgc Sur.7z23 KiB114
Qdgc Svk.7z13 KiB124
Qdgc Svn.7z8 KiB110
Qdgc Swe.7z0.1 MiB129
Qdgc Swz.7z75 KiB125
Qdgc Syr.7z31 KiB133
Qdgc Tcd.7z1.3 MiB113
Qdgc Tgo.7z0.2 MiB117
Qdgc Tha.7z89 KiB113
Qdgc Tjk.7z26 KiB120
Qdgc Tkm.7z55 KiB125
Qdgc Tls.7z7 KiB113
Qdgc Tto.7z4 KiB116
Qdgc Tun.7z0.3 MiB131
Qdgc Tur.7z71 KiB120
Qdgc Twn.7z9 KiB124
Qdgc Tza.7z2.4 MiB130
Qdgc Uga.7z0.8 MiB126
Qdgc Ukr.7z55 KiB125
Qdgc Ury.7z22 KiB133
Qdgc Usa.7z2.3 MiB149
Qdgc Uzb.7z67 KiB131
Qdgc Ven.7z0.1 MiB115
Qdgc Vnm.7z82 KiB126
Qdgc Vut.7z6 KiB117
Qdgc Yem.7z43 KiB117
Qdgc Zaf.7z1.5 MiB204
Qdgc Zmb.7z0.8 MiB131
Qdgc Zwe.7z0.6 MiB143

The associated code for generating the QDGC is kept in the following project on github:

The error mentioned on the country level QDGC files was related to level 3 only where the grid set was somewhat off and thus not in compliance with the standard. It has been fixed now.

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