ISLSCP II Carbon Dioxide Emissions from Fossil Fuels, Cement, and Gas Flaring 
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File Name Convention
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There is one *.zip file with this data set: co2_emis_1d_1950-1995.zip. 
When extrapolated, there are 18 files, or 3 files for each of the 6 years                                                                                                                                                                                      (1950, 1960, 1970, 1980, 1990, 1995) in the following format:

1) co2_emis_1d_X.asc: gridded ASCII maps of the global Carbon Dioxide 
   Emissions. "co2_emis" stands for CO2 emissions, "1d" stands for 1-degree,
  "X" is the 4-digit year (1950, 1960, 1970, 1980, 1990, and 1995), and
  ".asc" means this is ASCII data.
2) co2_emis_1d_X.dif: ASCII tables of "differences" or points in the original 
   file that didn't match the ISLSCP-2 Land/Water mask, and were removed from
   the ASCII map files.
3) co2_emis_1d_X_changemap.asc: gridded ASCII map showing the differences
   between the ISLSCP2 land/water mask and the original data set: All points 
   with negative values ("-1") are those where the ISLSCP2 mask showed water but
   where the original data set showed land (i.e. CO2 emissions>0) and this point 
   was removed. All points with a value of zero are those points where the two
   land/water masks agreed.

Two additional files named NDP058.pdf and NDP058a.pdf contain the original 
documentation available from CDIAC for the two data sets provided here. These 
two documents contain many more details on data processing. These files are in 
Portable Document Format (PDF).

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ASCII File Format
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All of the files in the ISLSCP Initiative II data collection are in ESRI ArcGIS ASCII grid, 
or text format. The file format for the mapped files consists of numerical 
fields of varying length, which are delimited by a single space and arranged in 
columns and rows. The file format for these data files consists of ASCII 
numerical fields in real number format. The files contain 360 columns by 180 rows. 
Water cells are assigned the value of "-99". 

These files are gridded to a common equal-angle lat/long grid, where the 
coordinates of the upper left corner of the files are located at 180 degrees W, 90 degrees N and 
the lower right corner coordinates are located at 180 degrees E, 90 degrees S. Data in the files 
are ordered from North to South and from West to East beginning at 180 degrees 
West and 90 degrees North.