Search Results

You are looking at 1 - 10 of 82 items for :

  • normalized difference vegetation index x
  • Refine by Access: All x
Clear All
Open access

Ji-Jhong Chen, Shuyang Zhen, and Youping Sun

. Relative chlorophyll content measured with a SPAD-502 chlorophyll meter (Konica Minolta, Tokyo, Japan), MC-100 chlorophyll meter (Apogee Instruments, Logan, UT), and normalized difference vegetation index (NDVI) sensors (Apogee Instruments) under halogen

Free access

Georgene L. Johnson, Thomas R. Sinclair, and Kevin Kenworthy

monitored by measuring the normalized difference vegetation index (NDVI) using a Field Scout® TCM 500 “NDVI” turf color meter (Spectrum Technologies, Inc., Plainfield, IL) daily for each drying pot. The instrument was placed directly on the turfgrass because

Full access

Reginald S. Fletcher, David E. Escobar, and Mani Skaria

The normalized difference vegetation index (NDVI) provides relative estimates of vegetation vigor, density, and health. Little information is available on the application of NDVI imagery for citriculture. The objective of this study was to evaluate airborne NDVI imagery for assessing tree conditions in citrus (Citrus spp.) orchards. Images of two south Texas citrus groves with stressed and nonstressed trees were qualitatively evaluated. Stressed trees were easily detected from nonstressed trees in the images. The images were also helpful for developing survey plans of the citrus groves. Our results indicated that airborne NDVI images could be used as a tool to assess tree conditions in citrus orchards. Findings should be of interest to citrus growers, extension agents, agricultural consultants, and private surveying companies.

Full access

Monica Ann Pilat, Amy McFarland, Amy Snelgrove, Kevin Collins, Tina Marie Waliczek, and Jayne Zajicek

order from highest to lowest average NDVI value. Table 1. Minimum, maximum, and average normalized difference vegetation index (NDVI) for metropolitan statistical areas (MSA), ranked in order highest to lowest average NDVI in the study of the effect of

Free access

Thomas J. Trout, Lee F. Johnson, and Jim Gartung

photosynthetically active radiation absorbed by plant canopies ( Asrar et al., 1984 ; Daughtry et al., 1992 ; Goward and Huemmrich, 1992 ; Johnson and Scholasch, 2005 ). Spectral indices such as the normalized difference vegetation index (NDVI), derived as the

Open access

Eileen M. Perry, Ian Goodwin, and David Cornwall

) Normalized Difference Red-edge Index (NDRE), and ( F ) Modified Chlorophyll Absorption Reflectance Index (MCARI) and Normalized Difference Vegetation index (NDVI). The corresponding regression coefficients, adjusted R 2 values, and root mean square error

Full access

Alexander R. Kowalewski, Brian M. Schwartz, Austin L. Grimshaw, Dana G. Sullivan, and Jason B. Peake

NDVI revealed significant differences among the main effects of location and hybrid before the initiation of traffic, and no location × hybrid interaction was observed ( Table 2 ). Normalized difference vegetation index values at the Coastal Plain

Free access

Sarah E. Cathey, Jason K. Kruse, Thomas R. Sinclair, and Michael D. Dukes

.R. Kenworthy, K. 2009 Transpiration and normalized difference vegetation index response of seashore paspalum to soil drying HortScience 44 2046 2048 Kim, K.S. Beard, J.B. 1988 Comparative turfgrass evapotranspiration rates and associated plant morphological

Open access

Brian Schwartz, Jing Zhang, Jonathon Fox, and Jason Peake

higher mowing height ( Fig. 1B ). Fig. 1. Interactive effect of cultivar and mowing height on (A) turfgrass quality, (B) dark-green color index (DGCI), (C) green cover, and (D) normalized difference vegetation index (NDVI) in a hybrid bermudagrass field

Free access

Jeffrey C. Dunne, W. Casey Reynolds, Grady L. Miller, Consuelo Arellano, Rick L. Brandenburg, A. Schoeman, Fred H. Yelverton, and Susana R. Milla-Lewis

for testing null hypothesis of no effects from the analysis of variance for normalized difference vegetation index (NDVI), turfgrass cover and turfgrass uuality from data collected on 29 Sept. 2011 and 11 Sept. 2012 at the Lake Wheeler Turfgrass Field