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:

NameSizeHits
NameSizeHits
qdgc_africa.7z0.4 MiB308
qdgc_antarctica.7z1.1 MiB160
qdgc_asia.7z1.0 MiB162
qdgc_europe.7z2.2 MiB184
qdgc_northamerica.7z1.5 MiB150
qdgc_oceania.7z1.8 MiB175
qdgc_openocean.7z3 KiB168
qdgc_southamerica.7z0.4 MiB166

Here is a list of countries level files:

NameSizeHits
NameSizeHits
Qdgc Afg.7z80 KiB193
Qdgc Ago.7z1.5 MiB164
Qdgc Alb.7z9 KiB182
Qdgc Are.7z23 KiB150
Qdgc Arg.7z0.4 MiB158
Qdgc Arm.7z11 KiB159
Qdgc Ata.7z4.4 MiB159
Qdgc Atf.7z6 KiB150
Qdgc Aus.7z0.6 MiB176
Qdgc Aut.7z22 KiB140
Qdgc Aze.7z18 KiB152
Qdgc Bdi.7z64 KiB149
Qdgc Bel.7z13 KiB154
Qdgc Ben.7z0.1 MiB157
Qdgc Bfa.7z0.3 MiB159
Qdgc Bgd.7z22 KiB142
Qdgc Bgr.7z14 KiB149
Qdgc Bhs.7z13 KiB146
Qdgc Bih.7z15 KiB139
Qdgc Blr.7z40 KiB155
Qdgc Blz.7z8 KiB159
Qdgc Bol.7z0.1 MiB144
Qdgc Bra.7z0.7 MiB147
Qdgc Brn.7z5 KiB135
Qdgc Btn.7z10 KiB142
Qdgc Bwa.7z0.8 MiB154
Qdgc Caf.7z0.5 MiB145
Qdgc Can.7z1.6 MiB144
Qdgc Che.7z10 KiB149
Qdgc Chl.7z0.2 MiB138
Qdgc Chn.7z0.9 MiB144
Qdgc Civ.7z0.4 MiB134
Qdgc Cmr.7z0.9 MiB179
Qdgc Cod.7z3.0 MiB134
Qdgc Cog.7z0.6 MiB143
Qdgc Col.7z0.1 MiB151
Qdgc Cri.7z12 KiB148
Qdgc Cub.7z39 KiB142
Qdgc Cyp.7z6 KiB171
Qdgc Cze.7z19 KiB152
Qdgc Deu.7z54 KiB151
Qdgc Dji.7z97 KiB143
Qdgc Dnk.7z17 KiB139
Qdgc Dom.7z9 KiB150
Qdgc Dza.7z2.7 MiB137
Qdgc Ecu.7z31 KiB145
Qdgc Egy.7z1.0 MiB135
Qdgc Eri.7z0.5 MiB146
Qdgc Esh.7z0.4 MiB151
Qdgc Esp.7z58 KiB144
Qdgc Est.7z12 KiB143
Qdgc Eth.7z1.0 MiB161
Qdgc Fin.7z79 KiB152
Qdgc Fji.7z0.4 MiB145
Qdgc Flk.7z7 KiB146
Qdgc Fra.7z1.2 MiB154
Qdgc Gab.7z0.2 MiB157
Qdgc Gbr.7z69 KiB141
Qdgc Geo.7z14 KiB156
Qdgc Gha.7z0.7 MiB162
Qdgc Gin.7z0.4 MiB143
Qdgc Gmb.7z35 KiB141
Qdgc Gnb.7z67 KiB134
Qdgc Gnq.7z54 KiB149
Qdgc Grc.7z30 KiB143
Qdgc Grl.7z0.6 MiB139
Qdgc Gtm.7z17 KiB147
Qdgc Guy.7z27 KiB139
Qdgc Hnd.7z21 KiB154
Qdgc Hrv.7z19 KiB151
Qdgc Hti.7z8 KiB136
Qdgc Hun.7z18 KiB152
Qdgc Idn.7z0.4 MiB146
Qdgc Ind.7z0.5 MiB146
Qdgc Irl.7z15 KiB144
Qdgc Irn.7z0.2 MiB132
Qdgc Irq.7z40 KiB135
Qdgc Isl.7z29 KiB127
Qdgc Isr.7z8 KiB135
Qdgc Ita.7z94 KiB139
Qdgc Jam.7z6 KiB140
Qdgc Jor.7z17 KiB162
Qdgc Jpn.7z90 KiB146
Qdgc Kaz.7z0.3 MiB154
Qdgc Ken.7z0.8 MiB139
Qdgc Kgz.7z29 KiB135
Qdgc Khm.7z16 KiB135
Qdgc Kor.7z12 KiB119
Qdgc KOSOVO.7z1 KiB137
Qdgc Kwt.7z8 KiB154
Qdgc Lao.7z56 KiB138
Qdgc Lbn.7z5 KiB143
Qdgc Lbr.7z0.2 MiB141
Qdgc Lby.7z2.2 MiB144
Qdgc Lka.7z12 KiB136
Qdgc Lso.7z0.1 MiB140
Qdgc Ltu.7z16 KiB119
Qdgc Lux.7z5 KiB138
Qdgc Lva.7z13 KiB135
Qdgc Mar.7z1.8 MiB143
Qdgc Mda.7z14 KiB136
Qdgc Mdg.7z0.8 MiB133
Qdgc Mex.7z0.3 MiB139
Qdgc Mkd.7z7 KiB131
Qdgc Mli.7z2.2 MiB147
Qdgc Mmr.7z0.1 MiB139
Qdgc Mne.7z7 KiB137
Qdgc Mng.7z0.1 MiB126
Qdgc Moz.7z1.2 MiB153
Qdgc Mrt.7z1.3 MiB138
Qdgc Mwi.7z0.3 MiB145
Qdgc Mys.7z66 KiB137
Qdgc Nam.7z1.2 MiB168
Qdgc Ncl.7z10 KiB137
Qdgc NCYPRUS.7z1 KiB140
Qdgc Ner.7z1.6 MiB136
Qdgc Nga.7z0.9 MiB134
Qdgc Nic.7z18 KiB144
Qdgc Nld.7z14 KiB133
Qdgc Nor.7z0.3 MiB134
Qdgc Npl.7z24 KiB139
Qdgc Nzl.7z0.1 MiB139
Qdgc Omn.7z58 KiB141
Qdgc Pak.7z0.2 MiB138
Qdgc Pan.7z13 KiB141
Qdgc Per.7z0.1 MiB143
Qdgc Phl.7z55 KiB135
Qdgc Png.7z88 KiB134
Qdgc Pol.7z36 KiB134
Qdgc Pri.7z6 KiB133
Qdgc Prk.7z25 KiB135
Qdgc Prt.7z19 KiB145
Qdgc Pry.7z47 KiB140
Qdgc Pse.7z5 KiB148
Qdgc Qat.7z6 KiB138
Qdgc Rou.7z37 KiB134
Qdgc Rus.7z5.3 MiB150
Qdgc Rwa.7z35 KiB137
Qdgc Sau.7z0.2 MiB134
Qdgc Sdn.7z1.4 MiB131
Qdgc Sen.7z0.2 MiB123
Qdgc Slb.7z27 KiB142
Qdgc Sle.7z0.2 MiB142
Qdgc Slv.7z9 KiB118
Qdgc Som.7z1.1 MiB138
Qdgc SOMALILAND.7z95 B126
Qdgc Srb.7z14 KiB142
Qdgc Ssd.7z1.1 MiB135
Qdgc Sur.7z23 KiB128
Qdgc Svk.7z13 KiB141
Qdgc Svn.7z8 KiB125
Qdgc Swe.7z0.1 MiB144
Qdgc Swz.7z75 KiB140
Qdgc Syr.7z31 KiB149
Qdgc Tcd.7z1.3 MiB128
Qdgc Tgo.7z0.2 MiB133
Qdgc Tha.7z89 KiB133
Qdgc Tjk.7z26 KiB136
Qdgc Tkm.7z55 KiB139
Qdgc Tls.7z7 KiB129
Qdgc Tto.7z4 KiB131
Qdgc Tun.7z0.3 MiB146
Qdgc Tur.7z71 KiB136
Qdgc Twn.7z9 KiB140
Qdgc Tza.7z2.4 MiB144
Qdgc Uga.7z0.8 MiB143
Qdgc Ukr.7z55 KiB140
Qdgc Ury.7z22 KiB147
Qdgc Usa.7z2.3 MiB166
Qdgc Uzb.7z67 KiB146
Qdgc Ven.7z0.1 MiB130
Qdgc Vnm.7z82 KiB141
Qdgc Vut.7z6 KiB132
Qdgc Yem.7z43 KiB133
Qdgc Zaf.7z1.5 MiB225
Qdgc Zmb.7z0.8 MiB149
Qdgc Zwe.7z0.6 MiB158

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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