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Data Set ID: 
SV08V

SMAPVEX08 In Situ Vegetation Data, Version 1

This data set includes in situ vegetation data collected during the Soil Moisture Active Passive Validation Experiment 2008 (SMAPVEX08) 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

Parameter(s):
  • Vegetation > Leaf Characteristics > Leaf Area Index (LAI)
  • Vegetation > Plant Characteristics > Vegetation Water Content
Spatial Coverage:
  • N: 39.02, S: 38.95, E: -75.94, W: -76.09

Spatial Resolution:
  • 800 m x 800 m
Temporal Coverage:
  • 2 October 2008 to 7 October 2008
Temporal Resolution: Varies
Data Format(s):
  • Microsoft Excel
Platform(s) FIELD SURVEYS
Sensor(s): SOIL SAMPLER
Version: V1
Data Contributor(s): McKee, L., M. Cosh, and T. Jackson.

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.

McKee, L., M. Cosh, and T. Jackson. 2015. SMAPVEX08 In Situ Vegetation Data, Version 1. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: https://doi.org/10.5067/US4X5QPYH6DB. [Date Accessed].

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Detailed Data Description

This data set includes in situ vegetation data collected during the Soil Moisture Active Passive Validation Experiment 2008 (SMAPVEX08) 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.

Format

The following table provides descriptions for each column in the data file, Sum_VEG_SMAPVEX.xls. An associated Extensible Markup Language (XML) metadata file is also provided.

Table 1. Data Column Descriptions
Column Heading Description
Field Site Location
Crop SB: Soybean
Plant Part NA, Stalk, Ears, Leaves
Date 2-Digit Month/1-Digit Day/4-Digit Year
Average Field VWC Average Field Vegetation Water Content (Kg/m^2)
Average Field LAI Average Leaf Area Index
Average Field Latitude Decimal Degree, WGS84
Average Field Longitude Decimal Degree, WGS84
Notes Sampling notes, if any
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File and Directory Structure

Data files are available at:

https://n5eil01u.ecs.nsidc.org/SAN/SMAP_VAL/SV08V.001/

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File Naming Convention

The data file is named SV08V_Sum_VEG_SMAPVEX.xls.

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File Size

The data file is approximately 22 MB.

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Spatial Coverage

Southernmost Latitude: 38.95°N
Northernmost Latitude: 39.02°N
Westernmost Longitude: 76.09°W
Easternmost Longitude: 75.94°W

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Spatial Resolution

The spatial resolution for this data set is 800 m. To observe parameters at resolutions similar to SMAP footprints, data were aquired at relatively coarse resolutions. At such scales, satellite footprints are unlikely homogeneous, so individual fields were not correlated to footprints. Thus, soil moisture has been characterized for all fields within an area or block large enough to include several aircraft footprints. Each block included ten or more fields. Each field was sampled to provide statistically meaningful field average soil moisture. The groups of fields were then scaled up to various footprint and locations. For more details, see the SMAPVEX08 Experiment Plan.

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Projection

Latitude and longitude are in World Geodetic System (WGS84) coordinates.

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Temporal Coverage and Resolution

Vegetation samples were collected at least once between 08:00 and 17:00 local time from 2 October 2008 through 7 October 2008.

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Parameter or Variable

The parameters in this data set include Vegetation Water Content (VWC) [kg/m2], Leaf Area Index (LAI), and Plant Type.

Parameter Range

VWC: 0-10 kg/m2. Missing data are represented with NA.

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Software and Tools

No special tools are required to view these data. A spreadsheet program which recognizes tab-delimited text files, such as MS Excel is recommended. A word-processing program or Web browser will display the data.

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Data Acquisition and Processing

The goal of vegetation sampling is to generate the vegetation products used to estimate surface soil moisture from passive microwave radiometers. Sampling was designed to coincide with satellite overpasses, such as TM 5 and MODIS/Terra, which can be used to estimate vegetation water content on the regional scale.

Vegetation was collected at most SMAPVEX08 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, and collecting vegetation biomass samples from a .46 m by .46 m square. For more details, see the SMAPVEX08 Experiment Plan.

Samples were manually collected 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 provides vegetation water content and LAI only.

Error Sources

Since all of the data were manually collected, human error is possible.

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Contacts and Acknowledgments

Lynn G. McKee, Michael H. Cosh, Thomas J. Jackson
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

DOCUMENT REVISION DATE

N/A

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