https://data-gis.unep-wcmc.org/portal/home/item.html?id=1d5d46888b1e4fb19c45042de1e576b2#overview


Bailey's Ecoregions of the World (BYES,1989/2013)

the purpose of the work, which began in 1976, was to show how the national forests of the United States fit within the global ecoregional scheme. In this system an ecoregion is defined as any large portion of the Earth's surface over which the ecosystems have characteristics in common. There are three levels in this classification system, the Domains, the Divisions and the Provinces. Supplemental Information: Ecoregions of the continents are based on macroclimate (i.e., the climate that lies just beyond the local modifying irregularities of landform and vegetation). The theory behind the approach is that macroclimates are among the most significant factors affecting the distribution of life on Earth. As the macroclimate changes, the other components of the ecosystem change in response. Macroclimates influence soil formation and help shape surface topography, as well as affecting the suitability for human habitation. Four Domains were defined: Polar, Humid temperate, Humid tropical and Dry. The combination of temperature and rainfall to indicate major climatic zones was based on Köppen and Trewartha's work, where dry climates were treated as a separate entity from Tropical humid and Temperate humid. However, the Köppen system defines an addtional "Subtropical" division at this level. The next level in the Bailey system is the Divisions, and these are also climate - based, for example in the Humid temperate Domain there is Hot continental, Warm continental, Subtropical, Marine, Prairie and Mediterranean, all with Mountain variants (i.e., a total of 12 Divisions in this Domain). There are a total of 30 of these. The third and last level is the Provinces, which are based on physiognomy of vegetation, modified by climate. For example, the Forest-Meadow of Eastern Oceanic (Monsoon climate). There are a total of 98 of these subdivisions. 

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HLC Tree (YW);HLC-M;HLC-D;HLC-X;HLC-S;REF-CODE;DESCRIPTION;Details

800-7995 (0.04);7995;0E80;R0E80;YE80|YEO;YE80;Bailey Ecoregions (oceanic);macroclimate after Dietrich & Spalding

800-7996 (0.05);7996;0E50;R0E50;YE50|BA|POD;YE50;500 - Polar Domain (DB);low salinity, permanent/seasonal ice
800-7996-0E51;0E51;0E51;R0E51;YE51|BB|Bi;YE51;510 - Inner Polar Division;(PO01,PO34,PO35)
800-7996-0E52;0E52;0E52;R0E52;YE52|BC|Bä;YE52;520 - Outer Polar Division;(PO02,PO03,PO37)

800-7997 (0.13);7997;0E60;R0E60;YE60|WA|TED;YE60;600 - Temperate Domain (DW);westerlies, subtropical gyres, boundary currents
800-7997-0E61;0E61;0E61;R0E61;YE61|WB|Wp;YE61;610 - Poleward Westerlies Division;(PO31,PO14,PO36)
800-7997-0E62;0E62;0E62;R0E62;YE62|WC|Wä;YE62;620 - Equatorward Westerlies Division;(PO22,PO53,PO55,PO51*)
800-7997-0E63;0E63;0E63;R0E63;YE63|RA;YE63;630 - Subtropical Division (DR);(PO15*,PO20*,PO21,PO32*,PO33*)
800-7997-0E63-0E64;0E64;0E64;R0E64;YE64|RB;YE64;640 - High Salinity Subtropical Division;(PO30) - Elliott (1954) - unknown to Dietrich
800-7997-0E63-0E64-0E68;0E68;0E68;R0E68;YE68|RC;YE68;648 - Black Sea (part of MEDI);(PO24) - Spalding only
800-7997-0E65;0E65;0E65;R0E65;YE65|FA;YE65;650 - Jet Stream Division (DF);(PO28,PO12,PO29,PO04,PO45) western boundary currents
800-7997-0E69;0E69;0E69;R0E69;YE69|MA;YE69;690 - Monsoon ocean regions (DM);Dietrich only
800-7997-0E69-0E66;0E66;0E66;R0E66;YE66|MB|Mp;YE66;660 - Poleward Monsoon Division;(PO06,PO19,PO41)

800-8002 (0.20);8002;0E70;R0E70;YE70|MC|TRD;YE70;700 - Tropical Domain;monsoon, trades, equatorial countercurrent
800-8002-0E71;0E71;0E71;R0E71;YE71|MD|Mt;YE71;710 - Tropical Monsoon Division;(PO16,PO18,PO11,PO46,PO49)
800-8002-0E72;0E72;0E72;R0E72;YE72|ME;YE72;720 - High Salinity Tropical Monsoon Division;(PO17) - Elliott (1954) - unknown to Dietrich
800-8002-0E76;0E76;0E76;R0E76;YE76|AA;YE76;760 - Equatorial Countercurrent Division (DA);(PO07 - incl. PNEC)
800-8002-0E79;0E79;0E79;R0E79;YE79|PA;YE79;790 -Trade wind regions (DP);Dietrich only
800-8002-0E79-0E73;0E73;0E73;R0E73;YE73|PB|Pp;YE73;730 - Poleward Trades Division;(PO05,PO10,PO25,PO23,PO13*)
800-8002-0E79-0E74;0E74;0E74;R0E74;YE74|PC|Pw;YE74;740 - Trade Winds Division;(PO15*,PO20*,PO32*,PO33*,PO26)
800-8002-0E79-0E75;0E75;0E75;R0E75;YE75|PD|Pä;YE75;750 - Equatorward Trades Division;(PO09,PO08,PO27)

810-8100 (0.49);8100;0E90;R0E90;YE90|YEC;YE90;Bailey Ecoregions (continental);macroclimate after Koeppen-Trewartha

810-8105 (0.50);8105;0E10;R0E10;YE10|EA|PBD;YE10;100 - Polar & Boreal Domain (KE);all months below 10C / short cool summer
810-8105-0E13;0E13;0E13;R0E13;YE13|EB|E;YE13;130 - Subarctic Division;(GZ61,GZ62)
810-8105-0E13-0M13;0M13;0M13;R0M13;YM13|EB3|EM;YM13;M130 - Subarctic Regime Mountains;altitudinal (GZ63)

810-8106 (0.60);8106;0E15;R0E15;YE15|FA|PLC;YE15;150 - Polar climates (KF);Köppen only
810-8106-0E11;0E11;0E11;R0E11;YE11|FC|Fi;YE11;110 - Ice Cap Division;not in every version
810-8106-0E11-0M11;0M11;0M11;R0M11;YM11|FC3|FiM;YM11;M110 - Ice Cap Regime Mountains;not in every version
810-8106-0E12;0E12;0E12;R0E12;YE12|FB|Ft;YE12;120 - Tundra Division;(GZ51)
810-8106-0E12-0M12;0M12;0M12;R0M12;YM12|FB3|FtM;YM12;M120 - Tundra Regime Mountains;altitudinal (GZ63*)

810-8107 (0.70);8107;0E20;R0E20;YE20|CA|HTD;YE20;200 - Humid Temperate Domain (KC);rainy mid-latitude, polar/tropical air masses
810-8107-0E23;0E23;0E23;R0E23;YE23|CC|Cf;YE23;230 - Subtropical Division;(GZ81)
810-8107-0E23-0M23;0M23;0M23;R0M23;YM23|CC3|CfM;YM23;M230 - Subtropical Regime Mountains;altitudinal (GZ85)
810-8107-0E25;0E25;0E25;R0E25;YE25|CD|DE;YE25;250 - Prairie Division;subhumid Cf/Dca/Dcb (GZ72/GZ73 transition)
810-8107-0E25-0M25;0M25;0M25;R0M25;YM25|CD3|CfdM;YM25;M250 - Prairie Regime Mountains;altitudinal (GZ75)
810-8107-0E26;0E26;0E26;R0E26;YE26|CB|Cs;YE26;260 - Mediterranean Division;(GZ82)
810-8107-0E26-0M26;0M26;0M26;R0M26;YM26|CB3|CsM;YM26;M260 - Mediterranean Regime Mountains;altitudinal (GZ85)
899-8107-0E29;0E29;0E29;R0E29;YE29|DA;YE29;290 -Temperate climates (KD);Köppen only
810-8107-0E29-0E21;0E21;0E21;R0E21;YE21|DD|Dcb;YE21;210 - Warm Continental Division;(GZ72*)
810-8107-0E29-0E21-0M21;0M21;0M21;R0M21;YM21|DD3|DcbM;YM21;M210 - Warm Continental Regime Mountains;altitudinal (GZ75)
810-8107-0E29-0E22;0E22;0E22;R0E22;YE22|DC|Dca;YE22;220 - Hot Continental Division;(GZ72*)
810-8107-0E29-0E22-0M22;0M22;0M22;R0M22;YM22|DC3|DcaM;YM22;M220 - Hot Continental Regime Mountains;altitudinal (GZ75)
810-8107-0E29-0E24;0E24;0E24;R0E24;YE24|DB|Do;YE24;240 - Marine Division;GZ71)
810-8107-0E29-0E24-0M24;0M24;0M24;R0M24;YM24|DB3|DoM;YM24;M240 - Marine Regime Mountains;altitudinal (GZ75)

810-8108 (0.80);8108;0E30;R0E30;YE30|BA|DRD;YE30;300 - Dry Domain (KB);evaporation exceeds precipitation
810-8108-0E31;0E31;0E31;R0E31;YE31|BB|BSh;YE31;310* - (Sub-)Tropical Steppe Division;(GZ83 + GZ94) - also in 400
810-8108-0E31-0M31;0M31;0M31;R0M31;YM31|BB3|BShM;YM31;M310 - (Sub-)Tropical Steppe Regime Mountains;altitudinal (GZ85/GZ96)
810-8108-0E32;0E32;0E32;R0E32;YE32|BC|BWh;YE32;320* - (Sub-)Tropical Desert Division;(GZ84 + GZ95) - also in 400
810-8108-0E32-0M32;0M32;0M32;R0M32;YM32|BC3|BWhM;YM32;M320 - (Sub-)Tropical Desert Regime Mountains;not in every version
810-8108-0E33;0E33;0E33;R0E33;YE33|BD|BSk;YE33;330 - Temperate Steppe Division;(GZ73)
810-8108-0E33-0M33;0M33;0M33;R0M33;YM33|BD3|BSkM;YM33;M330 - Temperate Steppe Regime Mountains;altitudinal (GZ75)
810-8108-0E34;0E34;0E34;R0E34;YE34|BE|BWk;YE34;340 - Temperate Desert Division;(GZ74)
810-8108-0E34-0M34;0M34;0M34;R0M34;YM34|BE3|BWkM;YM34;M340 - Temperate Desert Regime Mountains;altitudinal (GZ75)

810-8109 (0.90);8109;0E40;R0E40;YE40|AA|HRD;YE40;400 - Humid Tropical Domain (KA);all months frost-free
810-8109-0E41;0E41;0E41;R0E41;YE41|AC|Aw;YE41;410 - Savanna Division;(GZ92 + GZ93)
810-8109-0E41-0M41;0M41;0M41;R0M41;YM41|AC3|AwM;YM41;M410 - Savanna Regime Mountains;altitudinal (GZ96)
810-8109-0E42;0E42;0E42;R0E42;YE42|AB|Ar;YE42;420 - Rainforest Division;(GZ91)
810-8109-0E42-0M42;0M42;0M42;R0M42;YM42|AB3|ArM;YM42;M420 - Rainforest Regime Mountains;altitudinal (GZ96)

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The global map has been digitised and converted to a geographic (lat/long) projection by the WCMC, Cambridge, UK. It is also available on CD from NOAAs National Geophysical Data Center in Boulder, Colorado as part of their Global Ecosystem Database Project. http://www.ngdc.noaa.gov/Store/.