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 MiB370
qdgc_antarctica.7z1.1 MiB214
qdgc_asia.7z1.0 MiB213
qdgc_europe.7z2.2 MiB246
qdgc_northamerica.7z1.5 MiB192
qdgc_oceania.7z1.8 MiB227
qdgc_openocean.7z3 KiB211
qdgc_southamerica.7z0.4 MiB216

Here is a list of countries level files:

Qdgc Afg.7z80 KiB243
Qdgc Ago.7z1.5 MiB223
Qdgc Alb.7z9 KiB231
Qdgc Are.7z23 KiB198
Qdgc Arg.7z0.4 MiB206
Qdgc Arm.7z11 KiB205
Qdgc Ata.7z4.4 MiB212
Qdgc Atf.7z6 KiB197
Qdgc Aus.7z0.6 MiB223
Qdgc Aut.7z22 KiB187
Qdgc Aze.7z18 KiB200
Qdgc Bdi.7z64 KiB196
Qdgc Bel.7z13 KiB206
Qdgc Ben.7z0.1 MiB210
Qdgc Bfa.7z0.3 MiB225
Qdgc Bgd.7z22 KiB200
Qdgc Bgr.7z14 KiB200
Qdgc Bhs.7z13 KiB196
Qdgc Bih.7z15 KiB189
Qdgc Blr.7z40 KiB204
Qdgc Blz.7z8 KiB204
Qdgc Bol.7z0.1 MiB197
Qdgc Bra.7z0.7 MiB193
Qdgc Brn.7z5 KiB184
Qdgc Btn.7z10 KiB194
Qdgc Bwa.7z0.8 MiB201
Qdgc Caf.7z0.5 MiB195
Qdgc Can.7z1.6 MiB188
Qdgc Che.7z10 KiB196
Qdgc Chl.7z0.2 MiB193
Qdgc Chn.7z0.9 MiB208
Qdgc Civ.7z0.4 MiB185
Qdgc Cmr.7z0.9 MiB231
Qdgc Cod.7z3.0 MiB196
Qdgc Cog.7z0.6 MiB203
Qdgc Col.7z0.1 MiB212
Qdgc Cri.7z12 KiB194
Qdgc Cub.7z39 KiB193
Qdgc Cyp.7z6 KiB222
Qdgc Cze.7z19 KiB195
Qdgc Deu.7z54 KiB194
Qdgc Dji.7z97 KiB190
Qdgc Dnk.7z17 KiB190
Qdgc Dom.7z9 KiB207
Qdgc Dza.7z2.7 MiB186
Qdgc Ecu.7z31 KiB194
Qdgc Egy.7z1.0 MiB182
Qdgc Eri.7z0.5 MiB199
Qdgc Esh.7z0.4 MiB197
Qdgc Esp.7z58 KiB193
Qdgc Est.7z12 KiB191
Qdgc Eth.7z1.0 MiB212
Qdgc Fin.7z79 KiB203
Qdgc Fji.7z0.4 MiB190
Qdgc Flk.7z7 KiB197
Qdgc Fra.7z1.2 MiB204
Qdgc Gab.7z0.2 MiB205
Qdgc Gbr.7z69 KiB191
Qdgc Geo.7z14 KiB200
Qdgc Gha.7z0.7 MiB211
Qdgc Gin.7z0.4 MiB191
Qdgc Gmb.7z35 KiB191
Qdgc Gnb.7z67 KiB181
Qdgc Gnq.7z54 KiB198
Qdgc Grc.7z30 KiB190
Qdgc Grl.7z0.6 MiB180
Qdgc Gtm.7z17 KiB191
Qdgc Guy.7z27 KiB189
Qdgc Hnd.7z21 KiB199
Qdgc Hrv.7z19 KiB193
Qdgc Hti.7z8 KiB186
Qdgc Hun.7z18 KiB197
Qdgc Idn.7z0.4 MiB194
Qdgc Ind.7z0.5 MiB194
Qdgc Irl.7z15 KiB190
Qdgc Irn.7z0.2 MiB180
Qdgc Irq.7z40 KiB187
Qdgc Isl.7z29 KiB171
Qdgc Isr.7z8 KiB185
Qdgc Ita.7z94 KiB183
Qdgc Jam.7z6 KiB197
Qdgc Jor.7z17 KiB210
Qdgc Jpn.7z90 KiB192
Qdgc Kaz.7z0.3 MiB195
Qdgc Ken.7z0.8 MiB183
Qdgc Kgz.7z29 KiB183
Qdgc Khm.7z16 KiB182
Qdgc Kor.7z12 KiB164
Qdgc KOSOVO.7z1 KiB180
Qdgc Kwt.7z8 KiB200
Qdgc Lao.7z56 KiB192
Qdgc Lbn.7z5 KiB185
Qdgc Lbr.7z0.2 MiB202
Qdgc Lby.7z2.2 MiB187
Qdgc Lka.7z12 KiB181
Qdgc Lso.7z0.1 MiB190
Qdgc Ltu.7z16 KiB171
Qdgc Lux.7z5 KiB186
Qdgc Lva.7z13 KiB177
Qdgc Mar.7z1.8 MiB194
Qdgc Mda.7z14 KiB182
Qdgc Mdg.7z0.8 MiB172
Qdgc Mex.7z0.3 MiB183
Qdgc Mkd.7z7 KiB194
Qdgc Mli.7z2.2 MiB193
Qdgc Mmr.7z0.1 MiB189
Qdgc Mne.7z7 KiB187
Qdgc Mng.7z0.1 MiB176
Qdgc Moz.7z1.2 MiB205
Qdgc Mrt.7z1.3 MiB181
Qdgc Mwi.7z0.3 MiB193
Qdgc Mys.7z66 KiB192
Qdgc Nam.7z1.2 MiB220
Qdgc Ncl.7z10 KiB190
Qdgc NCYPRUS.7z1 KiB187
Qdgc Ner.7z1.6 MiB186
Qdgc Nga.7z0.9 MiB179
Qdgc Nic.7z18 KiB187
Qdgc Nld.7z14 KiB177
Qdgc Nor.7z0.3 MiB179
Qdgc Npl.7z24 KiB198
Qdgc Nzl.7z0.1 MiB188
Qdgc Omn.7z58 KiB191
Qdgc Pak.7z0.2 MiB183
Qdgc Pan.7z13 KiB190
Qdgc Per.7z0.1 MiB195
Qdgc Phl.7z55 KiB173
Qdgc Png.7z88 KiB178
Qdgc Pol.7z36 KiB185
Qdgc Pri.7z6 KiB182
Qdgc Prk.7z25 KiB174
Qdgc Prt.7z19 KiB192
Qdgc Pry.7z47 KiB188
Qdgc Pse.7z5 KiB195
Qdgc Qat.7z6 KiB189
Qdgc Rou.7z37 KiB177
Qdgc Rus.7z5.3 MiB197
Qdgc Rwa.7z35 KiB181
Qdgc Sau.7z0.2 MiB201
Qdgc Sdn.7z1.4 MiB179
Qdgc Sen.7z0.2 MiB177
Qdgc Slb.7z27 KiB188
Qdgc Sle.7z0.2 MiB194
Qdgc Slv.7z9 KiB168
Qdgc Som.7z1.1 MiB195
Qdgc SOMALILAND.7z95 B172
Qdgc Srb.7z14 KiB195
Qdgc Ssd.7z1.1 MiB184
Qdgc Sur.7z23 KiB177
Qdgc Svk.7z13 KiB197
Qdgc Svn.7z8 KiB175
Qdgc Swe.7z0.1 MiB187
Qdgc Swz.7z75 KiB190
Qdgc Syr.7z31 KiB199
Qdgc Tcd.7z1.3 MiB174
Qdgc Tgo.7z0.2 MiB186
Qdgc Tha.7z89 KiB183
Qdgc Tjk.7z26 KiB183
Qdgc Tkm.7z55 KiB186
Qdgc Tls.7z7 KiB177
Qdgc Tto.7z4 KiB177
Qdgc Tun.7z0.3 MiB192
Qdgc Tur.7z71 KiB186
Qdgc Twn.7z9 KiB187
Qdgc Tza.7z2.4 MiB194
Qdgc Uga.7z0.8 MiB202
Qdgc Ukr.7z55 KiB189
Qdgc Ury.7z22 KiB198
Qdgc Usa.7z2.3 MiB217
Qdgc Uzb.7z67 KiB196
Qdgc Ven.7z0.1 MiB179
Qdgc Vnm.7z82 KiB190
Qdgc Vut.7z6 KiB181
Qdgc Yem.7z43 KiB190
Qdgc Zaf.7z1.5 MiB303
Qdgc Zmb.7z0.8 MiB206
Qdgc Zwe.7z0.6 MiB223

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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