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 MiB325
qdgc_antarctica.7z1.1 MiB171
qdgc_asia.7z1.0 MiB176
qdgc_europe.7z2.2 MiB213
qdgc_northamerica.7z1.5 MiB162
qdgc_oceania.7z1.8 MiB189
qdgc_openocean.7z3 KiB178
qdgc_southamerica.7z0.4 MiB177

Here is a list of countries level files:

Qdgc Afg.7z80 KiB206
Qdgc Ago.7z1.5 MiB184
Qdgc Alb.7z9 KiB195
Qdgc Are.7z23 KiB161
Qdgc Arg.7z0.4 MiB168
Qdgc Arm.7z11 KiB170
Qdgc Ata.7z4.4 MiB177
Qdgc Atf.7z6 KiB161
Qdgc Aus.7z0.6 MiB187
Qdgc Aut.7z22 KiB151
Qdgc Aze.7z18 KiB164
Qdgc Bdi.7z64 KiB163
Qdgc Bel.7z13 KiB165
Qdgc Ben.7z0.1 MiB169
Qdgc Bfa.7z0.3 MiB180
Qdgc Bgd.7z22 KiB162
Qdgc Bgr.7z14 KiB161
Qdgc Bhs.7z13 KiB156
Qdgc Bih.7z15 KiB150
Qdgc Blr.7z40 KiB168
Qdgc Blz.7z8 KiB170
Qdgc Bol.7z0.1 MiB159
Qdgc Bra.7z0.7 MiB158
Qdgc Brn.7z5 KiB145
Qdgc Btn.7z10 KiB152
Qdgc Bwa.7z0.8 MiB168
Qdgc Caf.7z0.5 MiB157
Qdgc Can.7z1.6 MiB154
Qdgc Che.7z10 KiB159
Qdgc Chl.7z0.2 MiB157
Qdgc Chn.7z0.9 MiB168
Qdgc Civ.7z0.4 MiB146
Qdgc Cmr.7z0.9 MiB192
Qdgc Cod.7z3.0 MiB156
Qdgc Cog.7z0.6 MiB164
Qdgc Col.7z0.1 MiB169
Qdgc Cri.7z12 KiB159
Qdgc Cub.7z39 KiB153
Qdgc Cyp.7z6 KiB182
Qdgc Cze.7z19 KiB162
Qdgc Deu.7z54 KiB161
Qdgc Dji.7z97 KiB154
Qdgc Dnk.7z17 KiB154
Qdgc Dom.7z9 KiB167
Qdgc Dza.7z2.7 MiB148
Qdgc Ecu.7z31 KiB157
Qdgc Egy.7z1.0 MiB146
Qdgc Eri.7z0.5 MiB158
Qdgc Esh.7z0.4 MiB162
Qdgc Esp.7z58 KiB156
Qdgc Est.7z12 KiB154
Qdgc Eth.7z1.0 MiB173
Qdgc Fin.7z79 KiB169
Qdgc Fji.7z0.4 MiB156
Qdgc Flk.7z7 KiB159
Qdgc Fra.7z1.2 MiB171
Qdgc Gab.7z0.2 MiB168
Qdgc Gbr.7z69 KiB153
Qdgc Geo.7z14 KiB167
Qdgc Gha.7z0.7 MiB175
Qdgc Gin.7z0.4 MiB154
Qdgc Gmb.7z35 KiB154
Qdgc Gnb.7z67 KiB146
Qdgc Gnq.7z54 KiB160
Qdgc Grc.7z30 KiB155
Qdgc Grl.7z0.6 MiB150
Qdgc Gtm.7z17 KiB158
Qdgc Guy.7z27 KiB152
Qdgc Hnd.7z21 KiB166
Qdgc Hrv.7z19 KiB162
Qdgc Hti.7z8 KiB146
Qdgc Hun.7z18 KiB163
Qdgc Idn.7z0.4 MiB158
Qdgc Ind.7z0.5 MiB158
Qdgc Irl.7z15 KiB156
Qdgc Irn.7z0.2 MiB142
Qdgc Irq.7z40 KiB155
Qdgc Isl.7z29 KiB136
Qdgc Isr.7z8 KiB146
Qdgc Ita.7z94 KiB151
Qdgc Jam.7z6 KiB153
Qdgc Jor.7z17 KiB173
Qdgc Jpn.7z90 KiB157
Qdgc Kaz.7z0.3 MiB164
Qdgc Ken.7z0.8 MiB149
Qdgc Kgz.7z29 KiB148
Qdgc Khm.7z16 KiB147
Qdgc Kor.7z12 KiB129
Qdgc KOSOVO.7z1 KiB149
Qdgc Kwt.7z8 KiB164
Qdgc Lao.7z56 KiB155
Qdgc Lbn.7z5 KiB153
Qdgc Lbr.7z0.2 MiB152
Qdgc Lby.7z2.2 MiB155
Qdgc Lka.7z12 KiB148
Qdgc Lso.7z0.1 MiB151
Qdgc Ltu.7z16 KiB138
Qdgc Lux.7z5 KiB148
Qdgc Lva.7z13 KiB144
Qdgc Mar.7z1.8 MiB164
Qdgc Mda.7z14 KiB146
Qdgc Mdg.7z0.8 MiB144
Qdgc Mex.7z0.3 MiB149
Qdgc Mkd.7z7 KiB151
Qdgc Mli.7z2.2 MiB159
Qdgc Mmr.7z0.1 MiB156
Qdgc Mne.7z7 KiB152
Qdgc Mng.7z0.1 MiB137
Qdgc Moz.7z1.2 MiB166
Qdgc Mrt.7z1.3 MiB148
Qdgc Mwi.7z0.3 MiB155
Qdgc Mys.7z66 KiB159
Qdgc Nam.7z1.2 MiB181
Qdgc Ncl.7z10 KiB156
Qdgc NCYPRUS.7z1 KiB152
Qdgc Ner.7z1.6 MiB148
Qdgc Nga.7z0.9 MiB145
Qdgc Nic.7z18 KiB157
Qdgc Nld.7z14 KiB142
Qdgc Nor.7z0.3 MiB145
Qdgc Npl.7z24 KiB149
Qdgc Nzl.7z0.1 MiB153
Qdgc Omn.7z58 KiB156
Qdgc Pak.7z0.2 MiB149
Qdgc Pan.7z13 KiB158
Qdgc Per.7z0.1 MiB163
Qdgc Phl.7z55 KiB145
Qdgc Png.7z88 KiB150
Qdgc Pol.7z36 KiB152
Qdgc Pri.7z6 KiB148
Qdgc Prk.7z25 KiB145
Qdgc Prt.7z19 KiB159
Qdgc Pry.7z47 KiB155
Qdgc Pse.7z5 KiB159
Qdgc Qat.7z6 KiB153
Qdgc Rou.7z37 KiB145
Qdgc Rus.7z5.3 MiB161
Qdgc Rwa.7z35 KiB147
Qdgc Sau.7z0.2 MiB144
Qdgc Sdn.7z1.4 MiB143
Qdgc Sen.7z0.2 MiB139
Qdgc Slb.7z27 KiB153
Qdgc Sle.7z0.2 MiB153
Qdgc Slv.7z9 KiB129
Qdgc Som.7z1.1 MiB158
Qdgc SOMALILAND.7z95 B137
Qdgc Srb.7z14 KiB159
Qdgc Ssd.7z1.1 MiB148
Qdgc Sur.7z23 KiB138
Qdgc Svk.7z13 KiB159
Qdgc Svn.7z8 KiB135
Qdgc Swe.7z0.1 MiB155
Qdgc Swz.7z75 KiB151
Qdgc Syr.7z31 KiB160
Qdgc Tcd.7z1.3 MiB137
Qdgc Tgo.7z0.2 MiB149
Qdgc Tha.7z89 KiB145
Qdgc Tjk.7z26 KiB148
Qdgc Tkm.7z55 KiB150
Qdgc Tls.7z7 KiB140
Qdgc Tto.7z4 KiB143
Qdgc Tun.7z0.3 MiB158
Qdgc Tur.7z71 KiB149
Qdgc Twn.7z9 KiB156
Qdgc Tza.7z2.4 MiB157
Qdgc Uga.7z0.8 MiB156
Qdgc Ukr.7z55 KiB154
Qdgc Ury.7z22 KiB160
Qdgc Usa.7z2.3 MiB181
Qdgc Uzb.7z67 KiB161
Qdgc Ven.7z0.1 MiB144
Qdgc Vnm.7z82 KiB154
Qdgc Vut.7z6 KiB148
Qdgc Yem.7z43 KiB153
Qdgc Zaf.7z1.5 MiB241
Qdgc Zmb.7z0.8 MiB172
Qdgc Zwe.7z0.6 MiB183

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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