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 MiB271
qdgc_antarctica.7z1.1 MiB139
qdgc_asia.7z1.0 MiB138
qdgc_europe.7z2.2 MiB161
qdgc_northamerica.7z1.5 MiB130
qdgc_oceania.7z1.8 MiB152
qdgc_openocean.7z3 KiB147
qdgc_southamerica.7z0.4 MiB144

Here is a list of countries level files:

NameSizeHits
NameSizeHits
Qdgc Afg.7z80 KiB167
Qdgc Ago.7z1.5 MiB145
Qdgc Alb.7z9 KiB160
Qdgc Are.7z23 KiB128
Qdgc Arg.7z0.4 MiB138
Qdgc Arm.7z11 KiB139
Qdgc Ata.7z4.4 MiB139
Qdgc Atf.7z6 KiB131
Qdgc Aus.7z0.6 MiB152
Qdgc Aut.7z22 KiB120
Qdgc Aze.7z18 KiB132
Qdgc Bdi.7z64 KiB129
Qdgc Bel.7z13 KiB135
Qdgc Ben.7z0.1 MiB138
Qdgc Bfa.7z0.3 MiB140
Qdgc Bgd.7z22 KiB122
Qdgc Bgr.7z14 KiB128
Qdgc Bhs.7z13 KiB126
Qdgc Bih.7z15 KiB119
Qdgc Blr.7z40 KiB136
Qdgc Blz.7z8 KiB137
Qdgc Bol.7z0.1 MiB124
Qdgc Bra.7z0.7 MiB125
Qdgc Brn.7z5 KiB116
Qdgc Btn.7z10 KiB122
Qdgc Bwa.7z0.8 MiB134
Qdgc Caf.7z0.5 MiB124
Qdgc Can.7z1.6 MiB124
Qdgc Che.7z10 KiB127
Qdgc Chl.7z0.2 MiB119
Qdgc Chn.7z0.9 MiB122
Qdgc Civ.7z0.4 MiB115
Qdgc Cmr.7z0.9 MiB158
Qdgc Cod.7z3.0 MiB114
Qdgc Cog.7z0.6 MiB124
Qdgc Col.7z0.1 MiB131
Qdgc Cri.7z12 KiB128
Qdgc Cub.7z39 KiB122
Qdgc Cyp.7z6 KiB144
Qdgc Cze.7z19 KiB133
Qdgc Deu.7z54 KiB131
Qdgc Dji.7z97 KiB123
Qdgc Dnk.7z17 KiB120
Qdgc Dom.7z9 KiB130
Qdgc Dza.7z2.7 MiB119
Qdgc Ecu.7z31 KiB123
Qdgc Egy.7z1.0 MiB115
Qdgc Eri.7z0.5 MiB126
Qdgc Esh.7z0.4 MiB131
Qdgc Esp.7z58 KiB124
Qdgc Est.7z12 KiB123
Qdgc Eth.7z1.0 MiB141
Qdgc Fin.7z79 KiB130
Qdgc Fji.7z0.4 MiB126
Qdgc Flk.7z7 KiB127
Qdgc Fra.7z1.2 MiB135
Qdgc Gab.7z0.2 MiB137
Qdgc Gbr.7z69 KiB119
Qdgc Geo.7z14 KiB135
Qdgc Gha.7z0.7 MiB139
Qdgc Gin.7z0.4 MiB123
Qdgc Gmb.7z35 KiB121
Qdgc Gnb.7z67 KiB113
Qdgc Gnq.7z54 KiB128
Qdgc Grc.7z30 KiB121
Qdgc Grl.7z0.6 MiB120
Qdgc Gtm.7z17 KiB126
Qdgc Guy.7z27 KiB116
Qdgc Hnd.7z21 KiB133
Qdgc Hrv.7z19 KiB133
Qdgc Hti.7z8 KiB116
Qdgc Hun.7z18 KiB130
Qdgc Idn.7z0.4 MiB126
Qdgc Ind.7z0.5 MiB124
Qdgc Irl.7z15 KiB125
Qdgc Irn.7z0.2 MiB112
Qdgc Irq.7z40 KiB116
Qdgc Isl.7z29 KiB107
Qdgc Isr.7z8 KiB113
Qdgc Ita.7z94 KiB117
Qdgc Jam.7z6 KiB121
Qdgc Jor.7z17 KiB132
Qdgc Jpn.7z90 KiB126
Qdgc Kaz.7z0.3 MiB134
Qdgc Ken.7z0.8 MiB119
Qdgc Kgz.7z29 KiB115
Qdgc Khm.7z16 KiB115
Qdgc Kor.7z12 KiB100
Qdgc KOSOVO.7z1 KiB118
Qdgc Kwt.7z8 KiB133
Qdgc Lao.7z56 KiB117
Qdgc Lbn.7z5 KiB121
Qdgc Lbr.7z0.2 MiB120
Qdgc Lby.7z2.2 MiB122
Qdgc Lka.7z12 KiB114
Qdgc Lso.7z0.1 MiB120
Qdgc Ltu.7z16 KiB99
Qdgc Lux.7z5 KiB116
Qdgc Lva.7z13 KiB114
Qdgc Mar.7z1.8 MiB124
Qdgc Mda.7z14 KiB118
Qdgc Mdg.7z0.8 MiB114
Qdgc Mex.7z0.3 MiB117
Qdgc Mkd.7z7 KiB110
Qdgc Mli.7z2.2 MiB126
Qdgc Mmr.7z0.1 MiB120
Qdgc Mne.7z7 KiB116
Qdgc Mng.7z0.1 MiB106
Qdgc Moz.7z1.2 MiB128
Qdgc Mrt.7z1.3 MiB118
Qdgc Mwi.7z0.3 MiB125
Qdgc Mys.7z66 KiB117
Qdgc Nam.7z1.2 MiB145
Qdgc Ncl.7z10 KiB116
Qdgc NCYPRUS.7z1 KiB121
Qdgc Ner.7z1.6 MiB115
Qdgc Nga.7z0.9 MiB115
Qdgc Nic.7z18 KiB124
Qdgc Nld.7z14 KiB115
Qdgc Nor.7z0.3 MiB115
Qdgc Npl.7z24 KiB121
Qdgc Nzl.7z0.1 MiB120
Qdgc Omn.7z58 KiB120
Qdgc Pak.7z0.2 MiB119
Qdgc Pan.7z13 KiB119
Qdgc Per.7z0.1 MiB124
Qdgc Phl.7z55 KiB113
Qdgc Png.7z88 KiB115
Qdgc Pol.7z36 KiB115
Qdgc Pri.7z6 KiB115
Qdgc Prk.7z25 KiB117
Qdgc Prt.7z19 KiB126
Qdgc Pry.7z47 KiB120
Qdgc Pse.7z5 KiB128
Qdgc Qat.7z6 KiB119
Qdgc Rou.7z37 KiB115
Qdgc Rus.7z5.3 MiB129
Qdgc Rwa.7z35 KiB118
Qdgc Sau.7z0.2 MiB116
Qdgc Sdn.7z1.4 MiB113
Qdgc Sen.7z0.2 MiB105
Qdgc Slb.7z27 KiB124
Qdgc Sle.7z0.2 MiB122
Qdgc Slv.7z9 KiB98
Qdgc Som.7z1.1 MiB116
Qdgc SOMALILAND.7z95 B105
Qdgc Srb.7z14 KiB122
Qdgc Ssd.7z1.1 MiB115
Qdgc Sur.7z23 KiB110
Qdgc Svk.7z13 KiB121
Qdgc Svn.7z8 KiB106
Qdgc Swe.7z0.1 MiB126
Qdgc Swz.7z75 KiB121
Qdgc Syr.7z31 KiB130
Qdgc Tcd.7z1.3 MiB108
Qdgc Tgo.7z0.2 MiB112
Qdgc Tha.7z89 KiB107
Qdgc Tjk.7z26 KiB116
Qdgc Tkm.7z55 KiB119
Qdgc Tls.7z7 KiB110
Qdgc Tto.7z4 KiB111
Qdgc Tun.7z0.3 MiB127
Qdgc Tur.7z71 KiB115
Qdgc Twn.7z9 KiB120
Qdgc Tza.7z2.4 MiB125
Qdgc Uga.7z0.8 MiB120
Qdgc Ukr.7z55 KiB120
Qdgc Ury.7z22 KiB129
Qdgc Usa.7z2.3 MiB144
Qdgc Uzb.7z67 KiB128
Qdgc Ven.7z0.1 MiB110
Qdgc Vnm.7z82 KiB122
Qdgc Vut.7z6 KiB113
Qdgc Yem.7z43 KiB114
Qdgc Zaf.7z1.5 MiB197
Qdgc Zmb.7z0.8 MiB126
Qdgc Zwe.7z0.6 MiB138

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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