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 MiB362
qdgc_antarctica.7z1.1 MiB200
qdgc_asia.7z1.0 MiB202
qdgc_europe.7z2.2 MiB240
qdgc_northamerica.7z1.5 MiB187
qdgc_oceania.7z1.8 MiB217
qdgc_openocean.7z3 KiB204
qdgc_southamerica.7z0.4 MiB205

Here is a list of countries level files:

Qdgc Afg.7z80 KiB236
Qdgc Ago.7z1.5 MiB216
Qdgc Alb.7z9 KiB224
Qdgc Are.7z23 KiB192
Qdgc Arg.7z0.4 MiB196
Qdgc Arm.7z11 KiB198
Qdgc Ata.7z4.4 MiB212
Qdgc Atf.7z6 KiB190
Qdgc Aus.7z0.6 MiB217
Qdgc Aut.7z22 KiB181
Qdgc Aze.7z18 KiB194
Qdgc Bdi.7z64 KiB192
Qdgc Bel.7z13 KiB198
Qdgc Ben.7z0.1 MiB204
Qdgc Bfa.7z0.3 MiB212
Qdgc Bgd.7z22 KiB192
Qdgc Bgr.7z14 KiB191
Qdgc Bhs.7z13 KiB188
Qdgc Bih.7z15 KiB187
Qdgc Blr.7z40 KiB195
Qdgc Blz.7z8 KiB199
Qdgc Bol.7z0.1 MiB188
Qdgc Bra.7z0.7 MiB186
Qdgc Brn.7z5 KiB183
Qdgc Btn.7z10 KiB186
Qdgc Bwa.7z0.8 MiB197
Qdgc Caf.7z0.5 MiB185
Qdgc Can.7z1.6 MiB184
Qdgc Che.7z10 KiB189
Qdgc Chl.7z0.2 MiB189
Qdgc Chn.7z0.9 MiB199
Qdgc Civ.7z0.4 MiB177
Qdgc Cmr.7z0.9 MiB224
Qdgc Cod.7z3.0 MiB187
Qdgc Cog.7z0.6 MiB195
Qdgc Col.7z0.1 MiB200
Qdgc Cri.7z12 KiB194
Qdgc Cub.7z39 KiB182
Qdgc Cyp.7z6 KiB213
Qdgc Cze.7z19 KiB190
Qdgc Deu.7z54 KiB187
Qdgc Dji.7z97 KiB190
Qdgc Dnk.7z17 KiB183
Qdgc Dom.7z9 KiB197
Qdgc Dza.7z2.7 MiB179
Qdgc Ecu.7z31 KiB189
Qdgc Egy.7z1.0 MiB176
Qdgc Eri.7z0.5 MiB192
Qdgc Esh.7z0.4 MiB190
Qdgc Esp.7z58 KiB187
Qdgc Est.7z12 KiB187
Qdgc Eth.7z1.0 MiB211
Qdgc Fin.7z79 KiB196
Qdgc Fji.7z0.4 MiB186
Qdgc Flk.7z7 KiB190
Qdgc Fra.7z1.2 MiB198
Qdgc Gab.7z0.2 MiB202
Qdgc Gbr.7z69 KiB181
Qdgc Geo.7z14 KiB194
Qdgc Gha.7z0.7 MiB203
Qdgc Gin.7z0.4 MiB181
Qdgc Gmb.7z35 KiB184
Qdgc Gnb.7z67 KiB176
Qdgc Gnq.7z54 KiB188
Qdgc Grc.7z30 KiB185
Qdgc Grl.7z0.6 MiB176
Qdgc Gtm.7z17 KiB186
Qdgc Guy.7z27 KiB180
Qdgc Hnd.7z21 KiB195
Qdgc Hrv.7z19 KiB187
Qdgc Hti.7z8 KiB174
Qdgc Hun.7z18 KiB190
Qdgc Idn.7z0.4 MiB186
Qdgc Ind.7z0.5 MiB186
Qdgc Irl.7z15 KiB184
Qdgc Irn.7z0.2 MiB171
Qdgc Irq.7z40 KiB181
Qdgc Isl.7z29 KiB163
Qdgc Isr.7z8 KiB177
Qdgc Ita.7z94 KiB178
Qdgc Jam.7z6 KiB189
Qdgc Jor.7z17 KiB199
Qdgc Jpn.7z90 KiB186
Qdgc Kaz.7z0.3 MiB186
Qdgc Ken.7z0.8 MiB175
Qdgc Kgz.7z29 KiB172
Qdgc Khm.7z16 KiB175
Qdgc Kor.7z12 KiB158
Qdgc KOSOVO.7z1 KiB173
Qdgc Kwt.7z8 KiB199
Qdgc Lao.7z56 KiB183
Qdgc Lbn.7z5 KiB180
Qdgc Lbr.7z0.2 MiB194
Qdgc Lby.7z2.2 MiB183
Qdgc Lka.7z12 KiB178
Qdgc Lso.7z0.1 MiB182
Qdgc Ltu.7z16 KiB170
Qdgc Lux.7z5 KiB178
Qdgc Lva.7z13 KiB171
Qdgc Mar.7z1.8 MiB191
Qdgc Mda.7z14 KiB174
Qdgc Mdg.7z0.8 MiB171
Qdgc Mex.7z0.3 MiB175
Qdgc Mkd.7z7 KiB184
Qdgc Mli.7z2.2 MiB188
Qdgc Mmr.7z0.1 MiB185
Qdgc Mne.7z7 KiB179
Qdgc Mng.7z0.1 MiB166
Qdgc Moz.7z1.2 MiB197
Qdgc Mrt.7z1.3 MiB176
Qdgc Mwi.7z0.3 MiB183
Qdgc Mys.7z66 KiB186
Qdgc Nam.7z1.2 MiB209
Qdgc Ncl.7z10 KiB185
Qdgc NCYPRUS.7z1 KiB179
Qdgc Ner.7z1.6 MiB176
Qdgc Nga.7z0.9 MiB173
Qdgc Nic.7z18 KiB184
Qdgc Nld.7z14 KiB170
Qdgc Nor.7z0.3 MiB173
Qdgc Npl.7z24 KiB188
Qdgc Nzl.7z0.1 MiB182
Qdgc Omn.7z58 KiB184
Qdgc Pak.7z0.2 MiB177
Qdgc Pan.7z13 KiB185
Qdgc Per.7z0.1 MiB190
Qdgc Phl.7z55 KiB172
Qdgc Png.7z88 KiB176
Qdgc Pol.7z36 KiB181
Qdgc Pri.7z6 KiB177
Qdgc Prk.7z25 KiB173
Qdgc Prt.7z19 KiB186
Qdgc Pry.7z47 KiB182
Qdgc Pse.7z5 KiB185
Qdgc Qat.7z6 KiB181
Qdgc Rou.7z37 KiB171
Qdgc Rus.7z5.3 MiB187
Qdgc Rwa.7z35 KiB176
Qdgc Sau.7z0.2 MiB188
Qdgc Sdn.7z1.4 MiB170
Qdgc Sen.7z0.2 MiB169
Qdgc Slb.7z27 KiB182
Qdgc Sle.7z0.2 MiB183
Qdgc Slv.7z9 KiB159
Qdgc Som.7z1.1 MiB187
Qdgc SOMALILAND.7z95 B170
Qdgc Srb.7z14 KiB187
Qdgc Ssd.7z1.1 MiB176
Qdgc Sur.7z23 KiB165
Qdgc Svk.7z13 KiB188
Qdgc Svn.7z8 KiB164
Qdgc Swe.7z0.1 MiB179
Qdgc Swz.7z75 KiB181
Qdgc Syr.7z31 KiB185
Qdgc Tcd.7z1.3 MiB168
Qdgc Tgo.7z0.2 MiB177
Qdgc Tha.7z89 KiB174
Qdgc Tjk.7z26 KiB181
Qdgc Tkm.7z55 KiB178
Qdgc Tls.7z7 KiB169
Qdgc Tto.7z4 KiB169
Qdgc Tun.7z0.3 MiB187
Qdgc Tur.7z71 KiB176
Qdgc Twn.7z9 KiB184
Qdgc Tza.7z2.4 MiB186
Qdgc Uga.7z0.8 MiB192
Qdgc Ukr.7z55 KiB182
Qdgc Ury.7z22 KiB191
Qdgc Usa.7z2.3 MiB210
Qdgc Uzb.7z67 KiB188
Qdgc Ven.7z0.1 MiB171
Qdgc Vnm.7z82 KiB180
Qdgc Vut.7z6 KiB175
Qdgc Yem.7z43 KiB183
Qdgc Zaf.7z1.5 MiB292
Qdgc Zmb.7z0.8 MiB200
Qdgc Zwe.7z0.6 MiB210

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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