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Investigation:

LC-03 (Dobson / Soares)

LBA Dataset ID:

LC03_HYPSOGRAPHY_DEM

Originator(s):

1. DOBSON, M.C.
      2. PIERCE, L.E.

Point(s) of Contact:

ORNL DAAC User Services Office Oak Ridge National Laboratory Oak Ridge, Tennessee 37 (ornldaac@ornl.gov)

Dataset Abstract:

Raster Digital Elevation Model (DEM) images for four study areas in the Brazilian Amazon: Manaus, Tapajos, Rio Branco, and Rondonia.
The DEM images were encoded from the hypsography vectors [See related data set: LBA-ECO LC-03 Hypsography, Rivers, and Roads for Four Areas in the Brazilian Amazon]. The attribute value associated with each line and point in the vector segment is encoded into the image channel; the image channel is then filled in by interpolating image data between encoded vector data.
The vectors were hand-digitized by the Images Company in Brazil from paper maps produced by the Brazilian government. Depending on the scale of the original maps, the digitization errors vary. For some maps, some vectors were missing. We hand-checked to make sure that there were no extra vectors.
These data sets were derived from several map sheets. Each map was produced from aerial coverage. The Start date provided here for each site represents the earliest date of any one map in a set, because this is the worst-case value. For each DEM:
1 image channel with pixel resolution = 25m x 25m
Due to limited resources, these data have been neither validated nor quality-assured for general use. For that reason, extreme caution is advised when considering the use of these data.
- Any use of the derived data is not recommended because the results have not been validated.
- However, these DEM, vectors (hypsography, roads and rivers), and orthorectified SAR data can be used if the user understands how these data were produced and accepts the limitations.

Beginning Date:

1974-01-01

Ending Date:

1978-01-01

Metadata Last Updated on:

2012-06-08

Data Status:

Archived

Access Constraints:

PUBLIC

Data Center URL:

http://daac.ornl.gov/

Distribution Contact(s):

ORNL DAAC User Services Office Oak Ridge National Laboratory Oak Ridge, Tennessee 37 (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):

LBA-ECO LC-03 Hypsography, Rivers, Roads, and DEM, Four Areas across Brazilian Amazon:  http://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=1094

Documentation/Other Supporting Documents:

LBA-ECO LC-03 Hypsography, Rivers, Roads, and DEM, Four Areas across Brazilian Amazon:  http://daac.ornl.gov/LBA/guides/LC03_Hypsography_DEM.html

Citation Information - Other Details:

Dobson, M.C. and L.E. Pierce. 2012. LBA-ECO LC-03 Hypsography, Rivers, Roads, and DEM, Four Areas across Brazilian Amazon. Data set. Available on-line [http://daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. http://dx.doi.org/10.3334/ORNLDAAC/1094

Keywords - Theme:

Parameter Topic Term Source Sensor
LAND COVER LAND SURFACE LAND USE/LAND COVER MAPS DIGITIZER
LAND COVER LAND SURFACE TOPOGRAPHY AERIAL PHOTOGRAPH DIGITIZER
LAND COVER LAND SURFACE LAND USE/LAND COVER MAPS DIGITIZER
LAND COVER LAND SURFACE TOPOGRAPHY AERIAL PHOTOGRAPH DIGITIZER
TERRAIN ELEVATION LAND SURFACE TOPOGRAPHY TOPOGRAPHIC MAP DIGITIZER

Uncontrolled Theme Keyword(s):  AMAZON, DIGITAL ELEVATION MODEL, HYPSOGRAPHY, TOPOGRAPHIC MAPS, TOPOGRAPHY

Keywords - Place (with associated coordinates):

Region
(click to view profile)
Site
(click to view profile)
North South East West
    -2.00170 -10.50140 -54.49890 -68.50080

Data Characteristics (Entity and Attribute Overview):

Data Characteristics:

The data associated with this data set is from 4 study sites in the Amazon:

Manaus

Tapajos

Rio Branco

Rondonia



The Manaus and Tapajos sites have the following data:



*.pix: PCI-formatted file with everything in it.

*dem.raw: DEM data, 2-bytes/pixel, pentium-byte-order

*georef.txt: Georeferencing information for the site,

including #pixels, #lines,

UTM zone/row, Ellipsoid,

and UTM corner coordinates.

*radar.geotiff: 3-channel geotiff file of the orthorectified

radar data.

channel 1 is L-band wet season

2 is L-band dry season

3 is C-band

data has been scaled such that it is

in dB power, with -40 dB linearly

scaled to DN=0, and 0dB scaled to be DN=255.

*classification.geotiff: 1-channel land-cover data.

0=no data

1=flat

2=short vegetation

3=forest regrowth

4=undisturbed forest

*biomass.geotiff: 1-channel biomass data.

Values are in Tons/hectare.



*roads.e00: road vectors in arc/info format, as hand-digitized

from paper topo maps.

*rivers.e00: river vectors in arc/info format, as hand-digitized

from paper topo maps.

*hypsography.e00: hypsography vectors in arc/info format,

as hand-digitized from paper topo maps.





The Rio Branco and Rondonia sites have the following data:



They each have 2 separate rasters:

- one raster for the DEM and vectors (hypsography, roads, rivers) and

- a different raster for the radar data (orthorectified SAR), land-cover, and biomass.



raster#1:

*.pix: PCI-formatted file with everything in it.

*dem.raw: DEM data, 2-bytes/pixel, pentium-byte-order

*georef.txt: Georeferencing information for the site,

including #pixels, #lines,

UTM zone/row, Ellipsoid,

and UTM corner coordinates.

*roads.e00: road vectors in arc/info format, as hand-digitized

from paper topo maps.

*rivers.e00: river vectors in arc/info format, as hand-digitized

from paper topo maps.

*hypsography.e00: hypsography vectors in arc/info format,

as hand-digitized from paper topo maps.



raster#2:

*.pix: PCI-formatted file with everything in it.

*georef.txt: Georeferencing information for the site,

including #pixels, #lines,

UTM zone/row, Ellipsoid,

and UTM corner coordinates.

*radar.geotiff: 3-channel geotiff file of the orthorectified

radar data.

channel 1 is L-band wet season

2 is L-band dry season

3 is C-band

data has been scaled such that it is

in dB power, with -40 dB linearly

scaled to DN=0, and 0dB scaled to be DN=255.

*classification.geotiff: 1-channel land-cover data.

0=no data

1=flat

2=short vegetation

3=forest regrowth

4=undisturbed forest

*biomass.geotiff: 1-channel biomass data.

Values are in Tons/hectare.





Temporal Coverage:

Hypsography, road, and river vectors:

Manaus: 1977-01-01

Rio Branco: 1976-01-01

Rondonia: 1974-01-01

Tapajos: 1978-01-01



Note: The date provided above for each site is the earliest date of any one map in a set because this is the worst-case value.





Data Application and Derivation:

These data sets were derived from several map sheets; each map was produced from aerial coverage.

Quality Assessment (Data Quality Attribute Accuracy Report):

Quality Assessment:

Due to limited resources, these data have been neither validated nor quality-assured for general use. For that reason, extreme caution is advised when considering the use of these data.



- Any use of the derived data is not recommended because the results have not been validated.



- However, the DEM, vectors (hypsography, rivers, and roads included in this data set), and orthorectified SAR data can be used if the user understands how these were produced and accepts the limitations.

Process Description:

Data Acquisition Materials and Methods:

The vectors were hand-digitized by the Images Company in Brazil from paper maps produced by the Brazilian government. Depending on the scale of the original maps, the digitization errors vary. For some maps, some vectors are missing. We hand-checked to make sure that there were no extra vectors.


These data sets were derived from several map sheets. Each map was produced from aerial coverage. The Start date provided here for each site represents the earliest date of any one map in a set because this is the worst-case value.

References:

None.

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