TY - ABST ID - crippen1990 AU - Crippen, Robert E. TI - Calculating the vegetation index faster UR - http://www.sciencedirect.com/science/article/pii/003442579090085Z DO - 10.1016/0034-4257(90)90085-z T2 - Remote Sensing of Environment PY - 1990 SN - 0034-4257 VL - 1 IS - 34 SP - 71-73 AB - The near-infrared (NIR) versus red “infrared percentage vegetation index,” NIR/(NIR + Red), is functionally and linearly equivalent to the normalized difference vegetation index, (NIR-Red/(NIR + Red). Advantageously, it is both computationally faster and never negative. ER - TY - JOUR ID - kooistra2003 AU - Kooistra, L. AU - Leuven, R. S. E. W. AU - Wehrens, R. AU - Nienhuis, P. H. AU - Buydens, L. M. C. TI - A comparison of methods to relate grass reflectance to soil metal contamination UR - http://dx.doi.org/10.1080/0143116031000080769 DO - 10.1080/0143116031000080769 T2 - International Journal of Remote Sensing PY - 2003 DA - 2003/01/01 SN - 0143-1161 VL - 24 IS - 24 SP - 4995-5010 AB - Grass-dominated vegetation covers large areas of the Dutch river floodplains. Remotely sensed data on the conditions under which this vegetation grows may yield information about the degree of soil contamination. This paper explores the relationship between grassland canopy reflectance and zinc (Zn) contamination in the soil under semi-field conditions. A field radiometer was used to record reflectance spectra of perennial ryegrass (Lolium perenne) in an experimental field with Zn concentrations in the soil ranging from 32 to 1800mgkg?1. Several spectral vegetation indices (VIs) and a multivariate approach using partial least squares (PLS) regression were investigated to evaluate their potential use in estimating Zn contamination levels. Compared to the best PLS model (RMSEP = 181.4 mg kg?1), the narrow band vegetation index MSAVI2mm performed better (RMSEP = 162.9 mg kg?1). Both MSAVI2mm and PLS gave a high user accuracy for the strongly contaminated soil class (100% and 91%, respectively), while the total accuracy was satisfactory (60% and 55%, respectively). Results from this feasibility study indicate the potential of using remote sensing techniques for the classification of contaminated areas in river floodplains. But as the results from this study may be both resolution- and location-dependent, research on field and image scale is now required to test the established relations and to assess their susceptibility to seasonal influences, species heterogeneity, and increased levels of spectral noise. ER - TY - ELEC ID - idb AU - Henrich, V. AU - Krauss, G. AU - Götze, C. AU - Sandow, C. TI - The IndexDatabase UR - https://www.indexdatabase.de/ CY - Bonn PY - 2011 DA - 2011 ER -