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Purdue Agronomy Farm Instrument Altitude (791811)

Listed in Datasets

By Craig S. T. Daughtry

The object of the experiment is to determine how the canopy reflectance varies as a function of height above the crop and, particularly, what minimum height is needed to acquire repeatable reflectance measurements.

Additional materials available

Version 1.0 - published on 05 May 2015 doi:10.4231/R75T3HFN - cite this Archived on 25 Oct 2016

Licensed under CC0 1.0 Universal

Description

The object of the experiment is to determine how the canopy reflectance varies as a function of height above the crop and, particularly, what minimum height is needed to acquire repeatable reflectance measurements. Data were acquired on three canopies, mature corn planted in 76 cm rows (field 52) mature soybeans planted in 96 cm rows with 50 to 70% ground cover (field 898) and mature soybeans planted in 76 cm rows with 100% ground cover (field 899). The canopies provided scenes with a range of row effects from pronounced rows to no obvious rows. Data were acquired at 10 heights hanging from 0.5m to 10m above the canopy. At each height 12 reflectance data points were acquired at 15 cm intervals in the direction perpendicular to the rows by moving the spectrometer along a horizontal board. The data analysis involves determining how the variance of the data obtained at each height changes with height. This analysis will provide the information necessary to place error bounds on reflectance data acquired at a particular height.

The test took place in 1979.

The supporting docs include a brief summary of used instruments, a wavelength table (Wavelength_ASCII.txt), reflectance note and reflectance tables (ReflectanceTable206.txt and ReflectanceTableMulti.txt), and file format description (ExperimentDataFormat3.txt). The format description file is in ASCII format in lines of 80 characters.

This research dataset is part the Field Research Data Library that consists of over 200,000 spectral observations of soils and vegetation that have been collected since 1972 till 1991 as part of the research focused on vegetation and soils at the Laboratory for Applications of Remote Sensing (LARS) located at the Purdue University.

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Notes

  • Location: Purdue Agronomy Farm, West Lafayette, IN
  • County: Tippecanoe
  • Latitude/Longitude: 0402813N 0865927W
  • Illumination: Solar
  • Landsat MSS Band Radiometer: Exotech 100
  • Wavelength Range: 0.50-1.10 um
  • Experiment Type: Crops - Corn, Soybeans
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