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Investigation:

LC-04 (Foley / Costa)

LBA Dataset ID:

LC04_Regional_Boundary_5min

Originator(s):

1. Costa, Marcos Heil
2. Oliveira, Carlos Henrique C.
3. Andrade, Ricardo Guimaraes
      4. Bustamante, Thiago R.
5. Silva, Fabricio A.
6. Coe, Michael T.

Point(s) of Contact:

Costa, Marcos Heil (mhcosta@mail.ufv.br)

Dataset Abstract:

The Amazon and Tocantins River Basins Border data set consists of a
single grid with values of 1 for cells within the basins and 0 for
cells outside. The resolution of the data set is 5 x 5 min
(approximately 9 x 9 km). The original data set covered the area of 6N
to 21S and 80W to 44W. This area was slightly expanded in the version
of the data set available for download from Oak Ridge National
Laboratory to be consistent with the LBA study area as defined for the
ORNL/LBA subsetting activity. The methodology described in the original documentation is as follows: Initially, two borders were drawn independently. The first one was
digitized from a 1:5.000.000 hydrogeological map of South America, that
has the borders of the Amazon and Tocantins basins marked. The second
one was digitized from a 1:000.000 map of Northern South America. This
map doesnÍt show the basin borders, so it was assumed that the border
would be in the middle point between nearby rivers that run into and
out of the basin. Then, the two maps were overlaid. The final version
was obtained together with the river directions data set, to match the
drainage areas of fluviometric stations, provided by ANEEL - Brazilian
Agency for Waters and Electrical Energy (see also the methodology
section of the river direction data set). References:
Brazil - IBGE, 1972: International chart of the world on the millionth
scale - Brazil. 46 p. Brazil - DNPM/UNESCO, 1996: Mapa hidrogeologico de America del Sur.

Beginning Date:

None indicated.

Ending Date:

None indicated.

Metadata Last Updated on:

2011-01-17

Data Status:

Archived

Access Constraints:

Public

Data Center URL:

http://daac.ornl.gov/

Distribution Contact(s):

ORNL DAAC User Services Office ornldaac@ornl.gov

Access Instructions:

Public

Data Access:

IMPORTANT: The LBA-ECO Project website is no longer being supported. Links to external websites may be inactive. Final data products from the LBA project can be found at the ORNL DAAC. Please follow the fair use guidelines found in the dataset documentation when using or citing LBA data.
Datafile(s):

ORNL DAAC:  http://daac.ornl.gov/cgi-bin/cart/order.pl?ds_id=670

Documentation/Other Supporting Documents:

Data Set Users Guide at ORNL DAAC:  http://daac.ornl.gov/LBA/guides/lba_basin_costa.html

Citation Information - Other Details:

Costa, M.H., C H C. Oliveira, R G. Andrade, T R. Bustamante, F A. Silva, and M T. Coe. 2003. LBA Regional Boundary for the Amazon and Tocantins River Basins, 5-min. Data set. Available on-line [http://www.daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. doi:10.3334/ORNLDAAC/670.

Keywords - Theme:

Parameter Topic Term Source Sensor
DRAINAGE HYDROSPHERE SURFACE WATER DIGITAL ELEVATION MODEL MODEL ANALYSIS
RIVERS/STREAMS HYDROSPHERE SURFACE WATER DIGITAL ELEVATION MODEL MODEL ANALYSIS

Uncontrolled Theme Keyword(s):  Amazon River, Tocantins River, drainage basin

Keywords - Place (with associated coordinates):

Region
(click to view profile)
Site
(click to view profile)
North South East West
Amazon Basin Amazon Basin 10.00000 -30.00000 -30.00000 -85.00000

Related Publication(s):

Costa, M.H., C.H.C. Oliveira, R.G. Andrade, T.R. Bustamante, F.A. Silva, and M.T. Coe. (2002) A macroscale hydrological data set of river flow routing parameters for the Amazon Basin. Journal of Geophysical Research-Atmospheres 107(D20):Article-8039.

Data Characteristics (Entity and Attribute Overview):

Data Characteristics:

The data file is in ASCII GRID format for ArcInfo. Complete format information can be found at ftp://daac.ornl.gov/data/lba/surf_hydro_and_water_chem/basin_border/comp/basin_readme.pdf.



The Amazon and Tocantins River Basins Border data set consists of a single grid with values of 1 for cells within the basins and 0 for cells outside. The resolution of the data set is 5 x 5 min (approximately 9 x 9 km). The original data set covered the area of 6N to 21S and 80W to 44W. This area was slightly expanded in the version of the data set available for download from Oak Ridge National Laboratory to be consistent with the LBA study area as defined for

the ORNL/LBA subsetting activity.



DATA FORMAT

-------------------------------------------------------------------

The downloadable file, lba_basin.dat.gz, is a UNIX compressed ASCII file.

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

ASCII array with integer Coordinates listed below are in decimal degrees.

Rows 420

Columns 660

UpLeftX -85

UpLeftY 10

LoRightX -30

LoRightY -25

cellsize 0.083333

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.

To import this file into ArcInfo use the following command at an ARC prompt:

ASCIIGRID <in_ascii_file> <out_grid> {INT FLOAT}

Arguments

<in_ascii_file> - the ASCII file to be converted.

<out_grid> - the name of the grid to be created.

{INT FLOAT} - the data type of the output grid.

INT - an integer grid will be created.

FLOAT - a floating-point grid will be created.

Process Description:

Data Acquisition Materials and Methods:



The methodology described in the original documentation is as follows: Initially, two borders were drawn independently. The first one was digitized from a 1:5.000.000 hydrogeological map of South America, that has the borders of the Amazon and Tocantins basins marked. The

second one was digitized from a 1:000.000 map of Northern South America. This map doesnÍt

show the basin borders, so it was assumed that the border would be in the middle point

between nearby rivers that run into and out of the basin. Then, the two maps were overlaid.

The final version was obtained together with the river directions data set, to match the drainage areas of fluviometric stations, provided by ANEEL - Brazilian Agency for Waters and Electrical Energy (see also the methodology section of the river direction data set).



-------------------------------------------------------------------

PROCEDURE USED TO CREATE THE LBA STUDY AREA SUBSET

-------------------------------------------------------------------

The original data file was provided by Marcos Heil Costa, at Federal University of Vicosa (UFV), Vicosa, MG, Brazil (mhcosta@mail.ufv.br). The original data were imported into ArcInfo using the ASCIIGRID command.

The original data set covered the area of 6N to 21S and 80W to 44W. In order to be consistent

with the other data sets provided for the LBA study area, the data set needed to be expanded to 10N to 25S and 85W to 30W. The extra cells added to the original data were all given the value of 0.

An ASCII array was created from the new expanded grid using the GRID command

GRIDASCII.

file.dat = GRIDASCII(expanded_grid)

LEGEND & ADDITIONAL SOURCES OF INFORMATION

-------------------------------------------------------------------

0 outside basin

1 within basin

For additional information please contact Marcos Heil Costa, at Federal University of Vicosa

(UFV), Vicosa, MG, Brazil (mhcosta@mail.ufv.br)

References:

Brazil - Instituto Brasileiro de Geografia e Estatística (IBGE). 1972: International chart of the

world on the millionth scale - Brazil. 46 p.

Brazil - DNPM/UNESCO, 1996: Mapa hidrogeologico de America del Sur.

References:

Costa, M. H., C. H. C. Oliveira, R. G. Andrade, T. R. Bustamante, F. A. Silva, and M. T. Coe. 2000. Amazon and Tocantins Basins Border. Data set. Federal University of Vicosa, Vicosa, MG, Brazil.



Instituto Brasileiro de Geografia e Estatística (Brasilian Institute of National Statistics and Geography). 1972. International chart of the world on the millionth scale. Brazil.



UNESCO, DNPM, and CPRM. 1996. Mapa hidrogeologico de America del Sur. Braisilia, Brazil.

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