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 MiB304
qdgc_antarctica.7z1.1 MiB156
qdgc_asia.7z1.0 MiB158
qdgc_europe.7z2.2 MiB180
qdgc_northamerica.7z1.5 MiB145
qdgc_oceania.7z1.8 MiB171
qdgc_openocean.7z3 KiB163
qdgc_southamerica.7z0.4 MiB162

Here is a list of countries level files:

Qdgc Afg.7z80 KiB188
Qdgc Ago.7z1.5 MiB160
Qdgc Alb.7z9 KiB176
Qdgc Are.7z23 KiB144
Qdgc Arg.7z0.4 MiB153
Qdgc Arm.7z11 KiB154
Qdgc Ata.7z4.4 MiB154
Qdgc Atf.7z6 KiB145
Qdgc Aus.7z0.6 MiB169
Qdgc Aut.7z22 KiB135
Qdgc Aze.7z18 KiB147
Qdgc Bdi.7z64 KiB145
Qdgc Bel.7z13 KiB148
Qdgc Ben.7z0.1 MiB151
Qdgc Bfa.7z0.3 MiB155
Qdgc Bgd.7z22 KiB138
Qdgc Bgr.7z14 KiB145
Qdgc Bhs.7z13 KiB140
Qdgc Bih.7z15 KiB134
Qdgc Blr.7z40 KiB149
Qdgc Blz.7z8 KiB152
Qdgc Bol.7z0.1 MiB139
Qdgc Bra.7z0.7 MiB140
Qdgc Brn.7z5 KiB130
Qdgc Btn.7z10 KiB137
Qdgc Bwa.7z0.8 MiB150
Qdgc Caf.7z0.5 MiB140
Qdgc Can.7z1.6 MiB138
Qdgc Che.7z10 KiB143
Qdgc Chl.7z0.2 MiB134
Qdgc Chn.7z0.9 MiB140
Qdgc Civ.7z0.4 MiB129
Qdgc Cmr.7z0.9 MiB174
Qdgc Cod.7z3.0 MiB129
Qdgc Cog.7z0.6 MiB138
Qdgc Col.7z0.1 MiB145
Qdgc Cri.7z12 KiB143
Qdgc Cub.7z39 KiB137
Qdgc Cyp.7z6 KiB167
Qdgc Cze.7z19 KiB147
Qdgc Deu.7z54 KiB146
Qdgc Dji.7z97 KiB138
Qdgc Dnk.7z17 KiB135
Qdgc Dom.7z9 KiB145
Qdgc Dza.7z2.7 MiB132
Qdgc Ecu.7z31 KiB140
Qdgc Egy.7z1.0 MiB130
Qdgc Eri.7z0.5 MiB141
Qdgc Esh.7z0.4 MiB146
Qdgc Esp.7z58 KiB139
Qdgc Est.7z12 KiB139
Qdgc Eth.7z1.0 MiB157
Qdgc Fin.7z79 KiB147
Qdgc Fji.7z0.4 MiB140
Qdgc Flk.7z7 KiB142
Qdgc Fra.7z1.2 MiB150
Qdgc Gab.7z0.2 MiB152
Qdgc Gbr.7z69 KiB136
Qdgc Geo.7z14 KiB150
Qdgc Gha.7z0.7 MiB155
Qdgc Gin.7z0.4 MiB138
Qdgc Gmb.7z35 KiB135
Qdgc Gnb.7z67 KiB129
Qdgc Gnq.7z54 KiB144
Qdgc Grc.7z30 KiB138
Qdgc Grl.7z0.6 MiB133
Qdgc Gtm.7z17 KiB142
Qdgc Guy.7z27 KiB134
Qdgc Hnd.7z21 KiB150
Qdgc Hrv.7z19 KiB146
Qdgc Hti.7z8 KiB132
Qdgc Hun.7z18 KiB147
Qdgc Idn.7z0.4 MiB140
Qdgc Ind.7z0.5 MiB141
Qdgc Irl.7z15 KiB140
Qdgc Irn.7z0.2 MiB127
Qdgc Irq.7z40 KiB131
Qdgc Isl.7z29 KiB120
Qdgc Isr.7z8 KiB128
Qdgc Ita.7z94 KiB134
Qdgc Jam.7z6 KiB135
Qdgc Jor.7z17 KiB157
Qdgc Jpn.7z90 KiB142
Qdgc Kaz.7z0.3 MiB149
Qdgc Ken.7z0.8 MiB132
Qdgc Kgz.7z29 KiB130
Qdgc Khm.7z16 KiB131
Qdgc Kor.7z12 KiB113
Qdgc KOSOVO.7z1 KiB133
Qdgc Kwt.7z8 KiB149
Qdgc Lao.7z56 KiB132
Qdgc Lbn.7z5 KiB138
Qdgc Lbr.7z0.2 MiB136
Qdgc Lby.7z2.2 MiB138
Qdgc Lka.7z12 KiB130
Qdgc Lso.7z0.1 MiB135
Qdgc Ltu.7z16 KiB114
Qdgc Lux.7z5 KiB133
Qdgc Lva.7z13 KiB128
Qdgc Mar.7z1.8 MiB138
Qdgc Mda.7z14 KiB132
Qdgc Mdg.7z0.8 MiB127
Qdgc Mex.7z0.3 MiB133
Qdgc Mkd.7z7 KiB126
Qdgc Mli.7z2.2 MiB143
Qdgc Mmr.7z0.1 MiB132
Qdgc Mne.7z7 KiB133
Qdgc Mng.7z0.1 MiB122
Qdgc Moz.7z1.2 MiB149
Qdgc Mrt.7z1.3 MiB132
Qdgc Mwi.7z0.3 MiB140
Qdgc Mys.7z66 KiB132
Qdgc Nam.7z1.2 MiB163
Qdgc Ncl.7z10 KiB131
Qdgc NCYPRUS.7z1 KiB136
Qdgc Ner.7z1.6 MiB132
Qdgc Nga.7z0.9 MiB130
Qdgc Nic.7z18 KiB139
Qdgc Nld.7z14 KiB128
Qdgc Nor.7z0.3 MiB129
Qdgc Npl.7z24 KiB133
Qdgc Nzl.7z0.1 MiB133
Qdgc Omn.7z58 KiB137
Qdgc Pak.7z0.2 MiB134
Qdgc Pan.7z13 KiB134
Qdgc Per.7z0.1 MiB139
Qdgc Phl.7z55 KiB130
Qdgc Png.7z88 KiB129
Qdgc Pol.7z36 KiB130
Qdgc Pri.7z6 KiB128
Qdgc Prk.7z25 KiB130
Qdgc Prt.7z19 KiB141
Qdgc Pry.7z47 KiB135
Qdgc Pse.7z5 KiB144
Qdgc Qat.7z6 KiB132
Qdgc Rou.7z37 KiB129
Qdgc Rus.7z5.3 MiB145
Qdgc Rwa.7z35 KiB132
Qdgc Sau.7z0.2 MiB129
Qdgc Sdn.7z1.4 MiB126
Qdgc Sen.7z0.2 MiB119
Qdgc Slb.7z27 KiB138
Qdgc Sle.7z0.2 MiB137
Qdgc Slv.7z9 KiB112
Qdgc Som.7z1.1 MiB132
Qdgc SOMALILAND.7z95 B119
Qdgc Srb.7z14 KiB136
Qdgc Ssd.7z1.1 MiB130
Qdgc Sur.7z23 KiB123
Qdgc Svk.7z13 KiB136
Qdgc Svn.7z8 KiB119
Qdgc Swe.7z0.1 MiB139
Qdgc Swz.7z75 KiB134
Qdgc Syr.7z31 KiB144
Qdgc Tcd.7z1.3 MiB122
Qdgc Tgo.7z0.2 MiB128
Qdgc Tha.7z89 KiB128
Qdgc Tjk.7z26 KiB131
Qdgc Tkm.7z55 KiB134
Qdgc Tls.7z7 KiB125
Qdgc Tto.7z4 KiB127
Qdgc Tun.7z0.3 MiB142
Qdgc Tur.7z71 KiB132
Qdgc Twn.7z9 KiB135
Qdgc Tza.7z2.4 MiB140
Qdgc Uga.7z0.8 MiB139
Qdgc Ukr.7z55 KiB134
Qdgc Ury.7z22 KiB143
Qdgc Usa.7z2.3 MiB161
Qdgc Uzb.7z67 KiB141
Qdgc Ven.7z0.1 MiB125
Qdgc Vnm.7z82 KiB134
Qdgc Vut.7z6 KiB127
Qdgc Yem.7z43 KiB127
Qdgc Zaf.7z1.5 MiB216
Qdgc Zmb.7z0.8 MiB143
Qdgc Zwe.7z0.6 MiB154

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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