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CLASIC07 In Situ Vegetation Data, Version 1
This data set includes in situ vegetation data collected during the Cloud and Land Surface Interaction Campaign 2007 (CLASIC07) campaign. Sampling was designed to coincide with satellite overpasses, such as Landsat's Thematic Mapper (TM) 5 and the Moderate Resolution Imaging Spectroradiometer (MODIS) sensor on NASA's Terra satellite (MODIS/Terra), which can be then used to estimate vegetation water content on the regional scale.
Geographic Coverage
Spatial Coverage: |
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Spatial Resolution: |
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Temporal Coverage: |
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Temporal Resolution: | Varies |
Parameter(s): |
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Platform(s) | FIELD SURVEYS |
Sensor(s): | SOIL SAMPLER |
Data Format(s): |
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Version: | V1 |
Data Contributor(s): | Jackson, T. and L. McKee. |
Metadata XML: | View Metadata Record |
Data Citation
As a condition of using these data, you must cite the use of this data set using the following citation. For more information, see our Use and Copyright Web page.
Jackson, T. and L. McKee. 2015. CLASIC07 In Situ Vegetation Data, Version 1. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: http://dx.doi.org/10.5067/7V38PNLVUNES. [Date Accessed].Detailed Data Description
This data set includes in situ vegetation data collected during the Cloud and Land Surface Interaction Campaign 2007 (CLASIC07) campaign. Sampling was designed to coincide with satellite overpasses, such as Landsat's Thematic Mapper (TM) 5 and the Moderate Resolution Imaging Spectroradiometer (MODIS) sensor on NASA's Terra satellite (MODIS/Terra), which can be then used to estimate vegetation water content on the regional scale.
This data set contains both ASCII text and Extensible Markup Language (XML) files
Data are available on the HTTPS site in the https://n5eil01u.ecs.nsidc.org/SMAP_VAL/CL07V.001/
directory. Within this directory, there is one folder, 2007.06.10
. Within the folder there are two files: CL07V_SUM_VEG_CLASIC.txt
and CL07V_SUM_VEG_CLASIC.txt.xml
.
The following table provides descriptions for each column in the ASCII text data file, SUM_VEG_CLASIC.txt
. An associated Extensible Markup Language (XML) metadata file is also provided.
Column Heading | Description |
---|---|
Field | Site location ID (LW: Little Washita, FC: Fort Cobb) |
Crop | Corn, Cotton, Cut WW: Harvested Winter Wheat, Pasture, WW:Winter Wheat |
Date | 1-Digit Month/2-Digit Day/4-Digit Year |
DOY | Day of Year |
Time | Time of sampling in Central Daylight Time (CDT) |
Average Field VWC | Vegetation Water Content [kg/m2] |
Average Field Latitude | Decimal Degree, WGS84 |
Average Field Longitude | Decimal Degree, WGS84 |
Average Field UTM Easting | WGS84, Zone 14, [m] |
Average Field UTM Northing | WGS84, Zone 14, [m] |
The data file is approximately 1.2 KB
Southernmost Latitude: 34.79°N
Northernmost Latitude: 35.21°N
Westernmost Longitude: 98.60°W
Easternmost Longitude: 97.95°W
Spatial Resolution
In situ measurements were sampled within a .46 m by .46 m square.
Projection Description
Latitude and longitude are in Universal Transverse Mercator (UTM) Zone 14N easting and northing and World Geodetic System 1984 (WGS84) coordinates.
Depending on the site, vegetation samples were collected once or twice during the campaign between 10 June 2007 and 3 July 2007. The sampling was conducted between 08:00 and 17:00 local time.
The measured parameter for this data set is Vegetation Water Content (VWC) [kg/m2].
Parameter Range
Valid parameter values for VWC are 0-10 kg/m2. Missing data are represented with -999.
Software and Tools
No special tools are required to view these data. A spreadsheet program which recognizes tab-delimited text files, such as Microsoft Excel is recommended. A word-processing program or Web browser will display the data.
Data Acquisition and Processing
The goal of vegetation sampling is the generation of vegetation data products that enable estimation of surface soil moisture from passive microwave radiometers. The sampling was designed to coincide with satellite overpasses, such as Thematic Mapper 5 (TM5) and MODIS/Terra, which can be used to estimate vegetation water content on the regional scale.
Vegetation information was collected at most CLASIC field sites at least once during the field campaign. The poor weather conditions made it impossible to get to all of the field sites. The sampling was conducted between 08:00 and 17:00 local time.
Three locations (Plots) in each of the fields were sampled. An effort was made to have these locations coincide with the soil moisture sampling points. Sampling consisted of recording vegetation height, row spacing and plant spacing, as well as collecting vegetation biomass samples from a .46 m by .46 m square. In the laboratory they were weighed, dried at 60°C for 48 to 96 hours, and then weighed again. This data set consists solely of vegetation water content. See the CLASIC experiment plan for more details.
Error Sources
Because these data were manually collected, human error is possible.
Contacts and Acknowledgments
Thomas J. Jackson, Lynn G. McKee
United States Department of Agriculture - Agricultural Research Service (USDA ARS)
Hydrology and Remote Sensing Laboratory
10300 Baltimore Avenue
Bldg. 007, Rm. 104
BARC-West
Beltsville, MD 20705
Document Information
DOCUMENT CREATION DATE
June 2015
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