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1 ################################################################################ |
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2 # MODIS Global Land Cover Classifications at 0.25, 0.5 and 1 degree (2000-2001)# |
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3 ################################################################################ |
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4 |
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5 The files in this directory were provided by Drs. Mark Friedl and Alan Strahler, |
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6 and Mr. John Hodges from the Department of Geography at Boston University. These |
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7 are global, coarse resolution (1/4, 1/2 and 1 degree spatial resolutions) land |
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8 cover classifications (dominant type, classification confidence and fractional |
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9 cover) generated using a full year of MODerate Resolution Imaging |
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10 Spectroradiometer (MODIS) data covering the period from October 2000 to October |
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11 2001. These land cover products use the classification scheme proposed by the |
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12 International Geosphere-Biosphere Programme (IGBP). Original 1km MODIS data and |
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13 land cover products are available from the EROS Data Center Distributed Active |
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14 Archive Center (DAAC) or from Boston University at |
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15 http://geography.bu.edu/landcover/index.html |
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16 |
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17 The objective of the MODIS Land Cover Product is to provide a suite of land |
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18 cover types useful to global system science modelers by exploiting the |
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19 information content of MODIS data in the spectral, temporal, spatial, and |
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20 directional domains. The MODIS Land Cover Product describes the geographic |
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21 distribution of the 17 IGBP land cover types based on an annual time series of |
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22 observations (See below for a list of the cover types included). Confidence |
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23 assessments of the classifications are also provided in a separate layer. The |
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24 data set also provides the fraction of each of the 17 classes within the coarser |
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25 resolution cells. These data sets have been adjusted to match the land/water |
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26 boundaries and fractions of the ISLSCP2 land/water masks. The user should always |
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27 refer to the full data set documentation and/or the reference below for more |
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28 information on data processing. |
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29 |
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30 Please cite the following publication when these data are used: |
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31 |
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32 Friedl M.A., D.K. McIver, J.C.F. Hodges, X.Y. Zhang, D. Muchoney, A.H. Strahler, |
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33 C.E. Woodcock, S. Gopal, A. Schneider, A. Cooper, A. Baccini, F. Gao, and C. |
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34 Schaaf, Global Land Cover Mapping from MODIS: Algorithms and Early Results, |
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35 Remote Sensing of Environment 83(1-2):287-302. |
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36 |
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37 Any problems encountered with the data set should be reported to Eric Brown de |
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38 Colstoun at ericbdc@ltpmail.gsfc.nasa.gov |
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39 |
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40 ############################################################################## |
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41 |
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42 File Name Convention |
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43 -------------------- |
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44 The data sets in this directory are provided at three spatial resolutions of |
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45 0.25, 0.5 and 1 degrees lat./long. For each spatial resolution there is a land |
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46 cover type classification layer (with numbers from 0 to 17), a classifier |
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47 confidence assessment layer, in percent, and 17 associated layers that provide |
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48 the fraction, from 0 to 100, of each land cover type per cell. The land cover |
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49 type files are named "modis_landcover_class_XX.asc", where XX is qd, hd, or 1d, |
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50 denoting a spatial resolution of 1/4, 1/2 or 1 degrees, respectively. The |
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51 classifier confidence layer is named "modis_landcover_conf_XX.asc", where XX is |
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52 the same as above. The fractional files are called "modis_landcover_XX_cZZ.asc", |
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53 where XX is the same as above, and ZZ is a number from 00 to 17 which represents |
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54 the land cover type code as described below. As an example, the file named |
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55 "modis_landcover_qd_c02.asc" is the fraction of Evergreen Broadleaf Forest at a |
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56 quarter degree spatial resolution. This file is associated with the |
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57 "modis_landcover_class_qd.asc" land cover type file and the |
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58 "modis_landcover_conf_qd.asc" classifier confidence file. |
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59 |
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60 ############################################################################## |
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61 |
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62 ASCII File Format |
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63 ------------------ |
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64 All of the files in the ISLSCP Initiative II data collection are in the ASCII, |
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65 or text format. The file format consists of numerical fields of varying length, |
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66 which are delimited by a single space and arranged in columns and rows. The |
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67 values in the land cover class type and classifier confidence files are written |
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68 as integers from 0 to 17 and 0 to 255, respectively. In the classifier |
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69 confidence files a value of 254 is assigned to all water bodies while a value of |
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70 255 is assigned to cells with no data. All values in the land cover fraction |
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71 files are written as real numbers. |
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72 |
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73 The files at different spatial resolutions each contain the following numbers of |
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74 columns and rows: |
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75 One degree: 360 columns by 180 rows |
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76 1/2 degree: 720 columns by 360 rows |
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77 1/4 degree: 1440 columns by 720 rows |
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78 |
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79 All files are gridded to a common equal-angle lat/long grid, where the |
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80 coordinates of the upper left corner of the files are located at 180oW, 90oN and |
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81 the lower right corner coordinates are located at 180oE, 90oS. Data in the files |
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82 are ordered from North to South and from West to East beginning at 180 degrees |
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83 West and 90 degrees North. |
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84 |
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85 The data files are PKZip compressed. On UNIX, they can be decompressed using the |
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86 "unzip -a" command. On Windows, they can be decompressed using WinZip or other |
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87 PKZip software. On the Macintosh, they can be decompressed using Stuffit |
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88 Expander. |
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89 |
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90 ################################################################################ |
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91 |
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92 Land Cover Type Codes and Definitions |
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93 ------------------------------------- |
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94 The following 17 IGBP classes are used. |
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95 |
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96 0 = Water Bodies: Oceans, seas, lakes, reservoirs, and rivers. Can be either fresh |
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97 or salt water bodies. Note that this class has not been mapped directly from |
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98 MODIS data in this provisional release. It is overlaid from a Digital Elevation |
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99 Model (DEM) generated for the MODIS processing stream at the Jet Propulsion |
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100 Laboratory (JPL). This has been adjusted to match the ISLSCP2 land/water masks. |
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101 |
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102 1= Evergreen Needleleaf Forests: Lands dominated by trees with a percent canopy |
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103 cover >60% and height exceeding 2 meters. Almost all trees remain green all |
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104 year. Canopy is never without green foliage. |
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105 |
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106 2= Evergreen Broadleaf Forests: Lands dominated by trees with percent canopy |
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107 cover >60% and height exceeding 2 meters. Almost all trees remain green year all |
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108 year. Canopy is never without green foliage. |
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109 |
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110 3= Deciduous Needleleaf Forests: Lands dominated by trees with a percent canopy |
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111 cover >60% and height exceeding 2 meters. Consists of seasonal needleleaf tree |
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112 communities with an annual cycle of leaf-on and leaf-off periods. |
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113 |
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114 4= Deciduous Broadleaf Forests: Lands dominated by trees with a percent canopy |
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115 cover >60% and height exceeding 2 meters. Consists of seasonal broadleaf tree |
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116 communities with an annual cycle of leaf-on and leaf-off periods. |
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117 |
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118 5= Mixed Forests: Lands dominated by trees with a percent canopy cover >60% and |
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119 height exceeding 2 meters. Consists of tree communities with interspersed |
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120 mixtures or mosaics of the other four forest cover types. None of the forest |
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121 types exceeds 60% of landscape. |
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122 |
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123 6= Closed Shrublands: Lands with woody vegetation less than 2 meters tall and |
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124 with shrub canopy cover is >60%. The shrub foliage can be either evergreen or |
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125 deciduous. |
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126 |
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127 7= Open Shrublands: Lands with woody vegetation less than 2 meters tall and with |
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128 shrub canopy cover is between 10-60%. The shrub foliage can be either evergreen |
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129 or deciduous. |
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130 |
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131 8= Woody Savannas: Lands with herbaceous and other understory systems and forest |
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132 canopy cover of 30-60%. The forest cover height exceeds 2 meters. |
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133 |
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134 9= Savannas: Lands with herbaceous and other understory systems and forest canopy |
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135 cover of 10-30%. The forest cover height exceeds 2 meters. |
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136 |
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137 10=Grasslands: Lands with herbaceous types of cover. Tree and shrub cover is |
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138 less than 10%. |
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139 |
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140 11=Permanent Wetlands: Lands with a permanent mixture of surface water and |
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141 herbaceous or woody vegetation. The vegetation can be present in either salt, |
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142 brackish, or fresh water. |
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143 |
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144 12=Croplands: Lands covered with temporary crops followed by harvest and a bare |
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145 soil period (e.g., single and multiple cropping systems). Note that perennial |
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146 woody crops will be classified as the appropriate forest or shrub land cover |
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147 type. |
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148 |
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149 13=Urban and Built-Up: Land primarily covered by buildings and other man-made |
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150 structures. Note that this class has not been mapped directly from MODIS data in |
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151 this provisional release. It is overlaid from the populated places layer from |
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152 the EDC Global Land Cover Characterization project (GLCC, |
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153 http://edcdaac.usgs.gov/glcc/glcc.html). |
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154 |
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155 14=Cropland/Natural Vegetation Mosaic: Lands with a mosaic of croplands, |
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156 forests, shrublands, and grasslands in which no one component comprises more |
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157 than 60% of the landscape. |
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158 |
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159 15=Permanent Snow and Ice: Lands under snow and/or ice cover throughout the year. |
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160 |
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161 16=Barren or Sparsely Vegetated: Lands with exposed soil, sand, rocks, or snow |
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162 that never has more than 10% vegetated cover during any time of the year. |
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163 |
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164 17=Unclassified: Artifacts due to discrepancies between the EDC GLCC water mask |
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165 and the JPL DEM. Found in coastal zones and mid-ocean islands in this |
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166 provisional release. |
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167 |
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168 ################################################################################ |