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Investigation:

LC-07 (Melack / Novo / Forsberg)

LBA Dataset ID:

LC07_BATHYMETRY_CURUAI

Originator(s):

1. MELACK, J.M.
2. NOVO, E.M.L.M.
3. BARBOSA, C.C.F.
      4. FREITAS, C.C.
5. FILHO, W.P.

Point(s) of Contact:

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

Dataset Abstract:

The bathymetry data provided represent a continuous surface from interpolated transect measurements of depth values of Lago Curuai, an Amazon River floodplain lake, upstream from Santarem, Para, Brazil. Field measurements were made in June of 2004. The first product contains the actual depth values (in meters) of the interpolated continuous surface in both ENVI and GeoTIFF formats. Also available is a color scaled depth GeoTIFF image which has an embedded color scale bar. This secondary file is meant only for viewing but has the unique advantage of being a GeoTIFF file. Therefore, this map can be a background image with other projected files of interest in the area.
Data provided in this data set were used to develop a methodology for processing and applying high resolution bathymetric linear transect field data acquired with a Lowrance-480M ecosounder in the Amazon floodplain. This research was supported by the addition of Landast/TM images for planning and executing the survey. 4600 km of transects were processed semi-automatically and integrated into a georeferenced database. A digital elevation model with 15 m horizontal resolution and 1 cm vertical resolution was generated for the floodplain. The changes in inundated area and volume of water on the floodplain were estimated. Regression models were constructed to predict flood area and water stored volume from water level. The results of this research show that water level and flooded area mapped from images are good enough for estimating water stored volume in the Lago Grande de Curuai (Barbosa et al., 2006).

Beginning Date:

2004-06-01

Ending Date:

2004-06-30

Metadata Last Updated on:

2011-03-07

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-07 Bathymetric Survey of Floodplain Lake, Lago Curuai, Para, Brazil: 2004 :  http://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=999

Documentation/Other Supporting Documents:

LBA-ECO LC-07 Bathymetric Survey of Floodplain Lake, Lago Curuai, Para, Brazil: 2004 :  http://daac.ornl.gov/LBA/guides/LC07_Bathymetry_Curuai.html

Citation Information - Other Details:

Melack, J.M., E.M.L. Novo, C. Barbosa, C.C. Freitas, W.P. Filho. 2011. LBA-ECO LC-07 Bathymetric Survey of Floodplain Lake, Lago Curuai, Para, Brazil: 2004. Data set. Available on-line [http://daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. doi:10.3334/ORNLDAAC/999

Keywords - Theme:

Parameter Topic Term Source Sensor
BATHYMETRY LAND SURFACE TOPOGRAPHY BOAT ECHO SOUNDERS
DEPTH LAND SURFACE TOPOGRAPHY BOAT ECHO SOUNDERS
DEPTH LAND SURFACE GEOMORPHOLOGY BOAT ECHO SOUNDERS
DEPTH LAND SURFACE TOPOGRAPHY BOAT ECHO SOUNDERS
DEPTH LAND SURFACE GEOMORPHOLOGY BOAT ECHO SOUNDERS
INUNDATION LAND SURFACE TOPOGRAPHY SATELLITES TM (THEMATIC MAPPER)
INUNDATION LAND SURFACE GEOMORPHOLOGY SATELLITES TM (THEMATIC MAPPER)
INUNDATION LAND SURFACE TOPOGRAPHY SATELLITES TM (THEMATIC MAPPER)
INUNDATION LAND SURFACE GEOMORPHOLOGY SATELLITES TM (THEMATIC MAPPER)

Uncontrolled Theme Keyword(s):  BATHYMETRY, ECOHYDROLOGY, FLOODED AREA DYNAMIC, FLOODING, FLOODPLAIN, IMAGE PROCESSING, INUNDATION, LAKE VOLUMNE, TIME SERIES, VARZEA, WETLAND, WETLANDS

Keywords - Place (with associated coordinates):

Region
(click to view profile)
Site
(click to view profile)
North South East West
  AMAZONAS (MANAUS) -1.92750 -2.31440 -55.05610 -55.95310

Related Publication(s):

Barbosa, C.C.F., E.M.L.M. Novo, J.M. Melack, R.M. Freitas, and W.P. Filho. 2006. A methodology for analysis of volume and flooded area dynamics: Lago Grande de Curuai Lago as an example. Revista Brasileira de Cartografia 58/3.

Lima, I.B.T., C.C. Barbosa, E.M. Novo, J.C. Carvalho, and J.L. Stech. 2005. Location of telemetric monitoring sites in Amazon floodplain Lakes, Acta Amazonica: 36(3), Manaus.

Novo, E.M.L.M., C.C.D. Barbosa, R.M. de Freitas, Y.E. Shimabukuro, J.M. Melack, and W. Pereira. 2006. Seasonal changes in chlorophyll distributions in Amazon floodplain lakes derived from MODIS images. Limnology 7(3):153-161.

Data Characteristics (Entity and Attribute Overview):

Data Characteristics:

The bathymetry data product is a binary data file representing a continuous surface of interpolated point measurements of depth values of Lago Curuai. The bathymetric map is provided as 4-byte float, plain binary raster image, 6527 columns by 2857 rows, 1 band, with 15 m pixel resolution. The data are provided in both an ENVI and a GeoTIFF file format.



Also available is a color scaled depth GeoTIFF image which has an embedded color scale bar. The secondary file is meant only for viewing but has the unique advantage of being a GeoTIFF file. Therefore, this map can be a background image with other projected files of interest in the area.



Bathymetry Data Product:

These files contain the actual depth values (in meters) of the interpolated continuous surface and are saved as real numbers. Zero depth refers to a water surface of 936 cm at the water gauge. The gauge Hidroweb number is 17060000. The background is masked and has its pixels set to a value of 13 m. The deepest point of the lake is less than 13 m deep.



The files are in two formats, an ENVI file format called Barbosa_Curuai_masked_bathymetry.img and it�s associated header file, Barbosa_Curuai_masked_bathymetry.hdr. The .hdr file is a plain text header file formatted for ENVI software. It contains the necessary parameters to open the ENVI file. The second file is a GeoTIFF file format and is called, Barbosa_Curuai_masked_bathymetry.tif. This file has the same pixel values, map, and projection information as the ENVI file. A color-key legend is embedded in the upper left, with a block of pixels graded in value from 0 to 13 so that whatever color scale is applied, it will automatically create a legend image in that box. The no-data-value pixels surrounding the lake are set to 13.0 as a mask value.



File Parameters:

Col: 6527

Rows: 2857

Bands: 1

Data Type: 32 bit

Interleave: bsq

Pixel resolution: 15 meters

Projection: GCS_South_American_1969

Datum: SAD-69/Brazil

UL Map: 618356.194, 9786941.598



Color-scaled Depth GeoTIFF Image:





This GeoTIFF, Barbosa_Curuai_bathymetry_colorscale_mapgrid.tif, is a 3-band file with pixels scaled to 1-byte (0 - 255) and is for display only. This image (or regular grid) is georeferenced and can be used as a background image with other georeferenced images for this area. The northwest corner is at 55 deg 56 min 10.39 sec west and 1 deg 55 min 39.74 sec south. The projection is UTM zone 21 south, SAD-69/Brazil.



File Parameters:

Col: 6727

Row: 3057

Bands: 3

Cellsize (X, Y) 15, 15



Projection Information:

SAD_1969_UTM_Zone_21S

False_Easting: 500,000

False_Northing: 10,000,000

Central_Meridian: -57

Latitude of Origin: 0

Datum: D_South_American_1969

Data Application and Derivation:

This bathymetry map was used to plan measurement sites and to study flow between the lake and surrounding floodplain. The results of this research show that water level and flooded area mapped from images are accurate enough for estimating the water stored volume in the Lago Grande de Curuai.



This data set could be used in the future to estimate the volume and the flooded area for different values of water level at the floodplain.

Quality Assessment (Data Quality Attribute Accuracy Report):

Quality Assessment:

The digital elevation model of the bottom of Curuai floodplain has a horizontal resolution of 15 meters and vertical resolution of 1 centimeter. The error in horizontal position is +-15 meters and the depths have +- 1 centimeter of error.

Process Description:

Data Acquisition Materials and Methods:

High resolution bathymetric data was acquired with a sonar device, the Lowrance-480M ecosounder, deployed from a boat on a series of tracks across Lago Curuai. in the Amazon River floodplain upstream from Santarem, Para, Brazil, in June of 2004 (Barbosa, 2005). This data was supported by Landast/TM images for planning and executing the survey. Transects totaling 4600 km were processed semi-automatically and integrated into a georeferenced database. A digital elevation model with 15 m horizontal resolution and 1 cm vertical resolution was generated for the floodplain. The changes in inundated area and volume of water on the floodplain were estimated. Regression models were constructed to predict flood area and water stored volume from water level. The resulting irregular grid of depth points was used to create a surface map using kriging methods.

References:

Novo, E.M.L.M., C.C.D. Barbosa, R.M. de Freitas, Y.E. Shimabukuro, J.M. Melack, and W. Pereira. 2006. Seasonal changes in chlorophyll distributions in Amazon floodplain lakes derived from MODIS images. Limnology 7(3):153-161. doi:10.1007/s10201-006-0179-8



Lima, I.B.T., C.C. Barbosa, E.M. Novo, J.C. Carvalho, and J.L. Stech. 2005. Location of telemetric monitoring sites in Amazon floodplain Lakes, Acta Amazonica: 36(3), Manaus.



Barbosa, C.C.F., E.M.L.M. Novo, J.M. Melack, R.M. Freitas, and W.P. Filho. 2006. A methodology for analysis of volume and flooded area dynamics: Lago Grande de Curuai Lago as an example. Revista Brasileira de Cartografia 58/3.




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