Example of Image Data

1 Deg Global Land Cover Data Set Derived from AVHRR, southern Africa subset

Data File:

This printout shows the header and the first nine data rows in the data set.

ncols 55

nrows 40

xllcorner 5

yllcorner -35

cellsize 1

NODATA_value -9999

0 0 6 6 6 1 6 1 1 6 6 6 6 1 6 6 1 1 1 6 6 6 6 6 6 6 6 6 6 7 7 7 7 10 10 10 7 7 7 7 7 7 7 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 6 6 1 6 1 1 1 1 6 1 1 6 6 1 1 1 1 6 6 6 6 6 6 6 6 6 6 7 7 7 10 10 7 7 7 10 10 10 10 10 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 10 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 6 6 6 6 7 7 7 10 7 7 7 7 10 10 10 10 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 10 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 6 1 6 6 6 7 7 7 7 7 7 7 7 11 11 10 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 10 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 6 1 6 7 7 7 7 7 7 11 11 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 10 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 6 6 0 0 1 1 6 6 6 7 7 11 11 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 10 1 1 1 1 10 10 1 1 1 1 1 1 1 1 1 1 1 1 6 6 6 6 0 6 6 6 6 7 6 7 11 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 10 10 10 1 1 6 6 6 6 1 1 1 1 1 1 1 6 1 1 6 6 6 6 6 6 6 6 7 7 10 10 1 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 10 6 6 6 6 6 6 6 6 1 1 1 1 1 6 6 1 1 6 6 6 6 6 6 11 6 6 10 7 6 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

Companion File:

This file contains background information about the land cover data set for southern Africa. To view the full file, please visit the ftp site: ftp://daac.ornl.gov/data/safari2k/vegetation_wetlands/land_cover_data_1deg/comp/README

The glcf1deg.dat.gz file contains a subset of the 1 Degree Global Land Cover data set derived from AVHRR, available from the Global Land Cover Facility at the University of Maryland. The subset is for southern Africa. This README file contains information regarding:
  1. Data format
  2. Procedure used to create the southern Africa subset
  3. Legend and data source

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DATA FORMAT

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The downloadable file, glcf1deg.dat.gz, is a UNIX compressed file.

The data file is in ASCII Grid format for ArcInfo. The file contains a single

ASCII array with integer values. Data values range from 0 to 12.Coordinates listed below are in decimal degrees.

Rows 40

Columns 55

UpLeftX 5

UpLeftY -35

LoRightX 60

LoRightY 5

cellsize 1

Projection geographic

The ASCII file consists of header information containing a set of keywords,

followed by cell values in row-major order. The file format is

<NCOLS xxx>

<NROWS xxx>

<XLLCORNER xxx>

<YLLCORNER xxx>

<CELLSIZE xxx>

{NODATA_VALUE xxx}

row 1

row 2

.

.

.

row n

where xxx is a number, and the keyword NODATA_VALUE is optional and defaults to -9999. Row 1 of the data is at the top of the grid, row 2 is just under row 1 and so on. The end of each row of data from the grid is terminated with a carriage return in the file. Although the nodata_value is set to -9999 in the header portion of the glcf1deg.dat file, that value does not actually occur in the data set.

Companion File in Html Format:

This is another version of the companion file in HTML format with a thumbnail picture of the data set.
http://www-eosdis.ornl.gov/data/bluangel_harvest/S2K/VF/glcf1deg.html