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Investigation:

LC-22 (DeFries / Shimabukuro)

LBA Dataset ID:

LC22_Ground_Validation_Tree_Cover

Originator(s):

1. DeFries-Bajpai, Ruth
2. Shimabukuro, Yosio Edemir
3. Anderson, Liana Oighenstein
4. Espirito-Santo, Fernando Del Bon
5. Hansen, Matthew C.
      6. Jasinski, Ellen W.
7. Latorre, Marcelo Lopes
8. Lima, Andre
9. Morton, Douglas C.

Point(s) of Contact:

Morton, Douglas C. (morton@geog.umd.edu)

Dataset Abstract:

This data set includes densiometer readings along transects at several research sites in the areas of Brasilia, DF; Sinop, MT; and the state of Rondonia. Readings were taken at 5m intervals to cover transects 100m long and 20-30m wide. Estimates of crown and canopy fractional cover derived from these readings are also provided, as well as basal area measurements, biomass estimates, representative tree heights, and brief descriptions of the land cover at each site. Data are given in three Excel spreadsheets, one for each region. These data were gathered in June-July 2003 as part of a validation effort for the University of Maryland\'s Vegetation Continuous Fields (VCF) product and to provide ground observations for the comparative assessment of automated deforestation monitoring methods being undertaken by this team. Funding for the research was provided by NASA\'s Terrestrial Ecology program.

Beginning Date:

2003-06-24

Ending Date:

2003-07-05

Metadata Last Updated on:

2008-11-05

Data Status:

In Preparation for Archive

Access Constraints:

Public

Data Center URL:

Distribution Contact(s):

LBA-DIS User Services (lba-dis@cptec.inpe.br)

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):

Download data at:   Search at ORNL DAAC
Download data at:   Search at ORNL DAAC
Download data at:   Search at ORNL DAAC
Access data via ORNL DAAC ftp :  Search at ORNL DAAC

Documentation/Other Supporting Documents:

Data Set User's Guide (draft):  Search at ORNL DAAC

Citation Information - Other Details:

DeFries, R.S., Y.E. Shimabukuro, M.C. Hansen, D.C. Morton, L.O. Anderson, M.L. Latorre, E.W. Jasinski. 2008. LBA-ECO LC-22 Field Validation of MODIS Tree Cover Density Analyses: July 2003. Data set. Available on-line [http://lba.cptec.inpe.br/] from LBA Data and Information System, National Institute for Space Research (INPE/CPTEC), Cachoeira Paulista, Sao Paulo, Brazil.

Keywords - Theme:

Parameter Topic Term Source Sensor
VEGETATION COVER BIOSPHERE VEGETATION GROUND-BASED OBSERVATION DENSIOMETER

Uncontrolled Theme Keyword(s):  canopy/crown cover, tree cover

Keywords - Place (with associated coordinates):

Region
(click to view profile)
Site
(click to view profile)
North South East West
Brasilia Brasilia National Park -15.58333 -15.75000 -47.88333 -48.08333
Brasilia Reserva Ecologica Aguas Emendadas -15.55000 -15.55000 -47.60000 -47.60000
Brasilia Reserva Ecologica do Roncador IBGE -15.93280 -15.93280 -47.85060 -47.85060
Mato Grosso Sinop -11.41230 -11.41230 -55.32470 -55.32470
Rondonia Alto Paraiso 0.00000 0.00000
Rondonia Fazenda Nossa Senhora -10.76180 -10.76180 -62.35720 -62.35720
Rondonia Fazenda Nova Vida -10.15600 -10.15600 -62.81100 -62.81100
Rondonia Ouro Preto do Oeste -10.75000 -10.75000 -62.26000 -62.26000

Related Publication(s):

Morton, D.C., R.S. DeFries, Y.E. Shimabukuro, L.O. Anderson, F. Del Bon Espirito-Santo, M. Hansen, and M. Carroll. 2005. Rapid Assessment of Annual Deforestation in the Brazilian Amazon Using MODIS Data. Earth Interactions 9(8):1-22.

Data Characteristics (Entity and Attribute Overview):

Data Characteristics:

Readings include HIT (vegetation reading, over 5m high), GAP (non-vegetation reading, but within crown), and TOTAL MISS (non-vegetation reading outside of any crown). Additional columns include 5, indicating the number of times vegetation below 5m height was within the densitometer scope; 2, indicating the number of times vegetation below 2m height intersected the sample point; and nada, indicating the number of times there was no vegetation at all at that point, out of the 105 observations made.



From these readings, estimates of crown and canopy fractional cover were made and are also included, as well as the estimated canopy/crown ratio for the transect.

Biomass estimates from basal area measurements are also given, made at several points for each transect. Palm trees are excluded from these tree counts and biomass estimates.

Tree heights (m) are also given for trees or palms whose heights were obtainable using a laser altimeter instrument.

Data Application and Derivation:

These data were collected to serve as validation information for classification of remotely sensed data. Field information and observations describe the ground conditions at particular MODIS 250 m pixels and polygons of new deforestation that can be used to train or validate algorithms for deforestation detection.

Quality Assessment (Data Quality Attribute Accuracy Report):

Quality Assessment:

These data were reviewed and deemed accurate, ready for use.

Process Description:

Data Acquisition Materials and Methods:

Densiometer measurements follow methodology of Hansen et al., 2002.

Basal area measurements for biomass estimation were made with a standard angle gauge. The basal area factor (BAF, in square meters) for each plot is recorded with the data. The method creates a variable-radius plot count of the number of trees (excluding palms) in a 360-degree rotation with trunks of width equal to or greater than the BAF index on the tool at breast height. These counts were taken at 3-5 points within each transect.

Tree heights were estimated with a laser altimeter. Both emergents and trees at average canopy height were measured. Several trees were measured at each site to gather representative canopy height samples at each site.

References:

Hansen, M.C., DeFries, R.S., Townshend, J.R.G., Marufu, L., and Sohlberg, R. (2002) Development of a MODIS tree cover validation data set for Western Province, Zambia. Remote Sensing of Environment 83(1-2), 320-335.

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