Results 311 to 320 of about 110,255 (346)

Directional vegetation index and its effects on normalized-difference-vegetation-index-based agricultural applications

SPIE Proceedings, 2006
The directional normalized difference vegetation index (NDVI) was calculated by using field measured spectral data of the winter wheat canopies at the crop different growth and development stages. In the principal plane, the hotspot and directional NDVI were analyzed.
Jun-hui Chen, Peng-xin Wang, Wei Sun, Li-ping Ling   +3 more
openaire   +1 more source

Upscale integration of normalized difference vegetation index: the problem of spatial heterogeneity

IEEE Transactions on Geoscience and Remote Sensing, 1992
The correspondence between the normalized difference vegetation index (NDVI) calculated from average reflectances, M/sub NDVI/, and NDVI integrated from individual NDVIs, I/sub NDVI/, by simulating AVHRR data from high spatial resolution SPOT 1 Haute Resolution Visible radiometer and Landsat Thematic Mapper data is analyzed.
Angora Aman, Heremino P. Randriamanantena, Alain Podaire, Robert Frouin   +3 more
openaire   +1 more source

Relative sensitivity of normalized difference vegetation Index (NDVI) and microwave polarization difference Index (MPDI) for vegetation and desertification monitoring

Remote Sensing of Environment, 1988
A simple equation relating the Microwave Polarization Difference Index (MPDI) and the Normalized Difference Vegetation Index (NDVI) is proposed which represents well data obtained from Nimbus 7/SMMR at 37 GHz and NOAA/AVHRR Channels 1 and 2. It is found that there is a limit which is characteristic of a particular type of cover for which both indices ...
Francois Becker, Bhaskar J Choudhury
openaire   +1 more source

Relation between the normalized difference vegetation index and ecological variables

Remote Sensing of Environment, 1991
Abstract The objectives of this study were to analyze the relationship between the AVHRR data [transformed into a normalized difference vegetation index (NDVI)] and ecological variables and, secondly, to evaluate the possibility of estimating actual evapotranspiration using AVHRR and other readily available data.
J. Cihlar, L. St.-Laurent, J.A. Dyer
openaire   +1 more source

Infrared Normalized Difference Vegetation Index for Sentinel-2A Imagery

2020 17th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON), 2020
Normalized Difference Vegetation Index (NDVI) is widely applied in several applications. It can be used to classify or identify the land coverage. However, the haze and cloud often disturb the accuracy of this value, which decreases the application performance.
openaire   +1 more source

A Simplified Atmospheric Correction Procedure for the Normalized Difference Vegetation Index

Photogrammetric Engineering & Remote Sensing, 2003
Accurate corrections of the Normalized Difference Vegetation Index (NDVI) for atmospheric effects are currently based on modeling the physical behavior of radiation as it passes through the atmosphere. An important requirement for application of the physical models is detailed information on atmospheric humidity and particles.
Jie Song, Duanjun Lu, M.L. Wesely
openaire   +1 more source

On the Use of the Normalized Difference Vegetation Index as an Indicator of Rainfall

1994
The remotely sensed Normalized Difference Vegetation Index, or NDVI, is being used operationally to evaluate rainfall and vegetation growth. It shows a good relationship to these variables in relatively dry locations, but the index saturates under humid conditions.
openaire   +1 more source

Simulating the relationship between thermal emissivity and the Normalized Difference Vegetation Index

International Journal of Remote Sensing, 1995
Abstract An experimental relation between the thermal ermssrvity and the Normalized Difference Vegetation Index of vegetation canopies has been found by van de Griend and Owe. This relationship is investigated by means of aradiative transfer model. The relationship was highly sensitive to soil and leaf emissivities, canopy structure, optical properties
openaire   +2 more sources

Optimum Monitoring Time for the Normalized Difference Vegetation Index of Crops

Transactions of the ASABE, 2015
Influenced by such factors as air temperature, humidity, solar radiation, and soil moisture, the normalized difference vegetation index (NDVI) for remote sensing of vegetation always changes dynamically within a day. Therefore, choosing the proper time to monitor the index is very important so as to minimize the effects of these factors. In this study,
openaire   +1 more source

On the relationship between normalized difference vegetation index and land surface temperature: MODIS-based analysis in a semi-arid to arid environment

Geocarto International, 2021
Salahuddin M Jaber
exaly