ENVIROMENTAL INFORMATION

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Raster Image Features table


DESCRIPTION:

We proposed a new methodology based on NDVI time series autocorrelation values and machine learning algorithms to assess fallowing temporal patterns across rainfed agricultural areas that were tested in mainland Spain. We found that approximately half of rainfed agricultural areas were regularly cultivated (RC) and distributed mainly in the north- western Spain whereas lands with crop-fallow rotation patterns every two (CF-2) and three years (CF-3) were distributed across northeast, center and south of Spain. You can see the spatial distribution in the map viewer below.

MOD
09Q1
NDVI 250
TS 2000 - 2012
FILTERED
TS
ACF
SPECIFIC ACF
FALLOW LANDS
REGIME

Copyright: Creative Commons Attribution 4.0 International

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GDB Report Features tables


DESCRIPTION:

The objective of the present study was to analyze the dynamics of the vegetation in ribera del Duero through the use of the NDVI index and to relate this index with climatic variables to study how the climate influences the development of crops. For this, the time series of the NDVI extracted from MODIS images of the different crops in the studied region in the period 2002-2020 were analyzed and this NDVI was related to the time series of two climatic variables such as temperature and precipitation, to evaluate the influence that these have on the dynamics of the vegetation of the area.
The stationarity of the time series was analyzed using the Dickey-Fuller test and, through the use of autocorrelation graphs and periodograms, their seasonality was analyzed. It was observed that none of the climatic and NDVI series studied had a trend and it was also observed that the NDVI series had a clear annual cycle.

MOD
09A1
NDVI 250 TS
FILTERED
ACF
CLIMATOLOGY
VEGETATION
DUERO

Copyright: Creative Commons Attribution 4.0 International

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Raster Image


DESCRIPTION:

Using the AVHRR product provided by NOAA, the NDVI time series has been calculated, a periodogram has been made to study different factors that affect the periodicity of the vegetative cycles. In this case, the number of seasonal cycles of vegetation.
Value 1: one cycle
Value 2: two cycles
Value 3: three cycles

AVHRR-NDVI
AVHRR NDVI
TS
PERIODOGRAM
AMPLITUDE OF SEASONAL
CYCLES
FALLOW LANDS
REGIME

Copyright: Creative Commons Attribution 4.0 International

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Raster Image


DESCRIPTION:

Using the AVHRR product provided by NOAA, the NDVI time series has been calculated, a periodogram has been made to study different factors that affect the periodicity of the vegetative cycles. In this case, the amplitude of the cycles.

AVHRR-NDVI
AVHRR NDVI
TS
PERIODOGRAM
AMPLITUDE OF SEASONAL
CYCLES

Copyright: Creative Commons Attribution 4.0 International

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Raster Image


DESCRIPTION:

Using the AVHRR product provided by NOAA, the NDVI time series has been calculated, a periodogram has been made to study different factors that affect the periodicity of the vegetative cycles. In this case, the Stability of seasonal cycles of vegetation.

Copyright: Creative Commons Attribution 4.0 International

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Raster Image


DESCRIPTION:

The main objective of this research was to assess cropland intensification by means of spectral analysis of MODIS NDVI time series in a high cloudiness tropical area such as Ecuador. A surface of 89,225 ha of the main staple crops in this country, which are rice and maize crops, was monitored to assess the evolution of the number of crop cycles. The 20-year period of NDVI time series was used to calculate the periodograms across four subperiods (2001–2005, 2006–2010, 2011–2015, 2016–2020). The maximum ordinate value of each periodogram was used as an indicator of the number of growing crop cycles per year identifying single-, double-, and triple-cropping systems in each subperiod. Cropland intensification was assessed by comparing the cropping system between the subperiods. Results reveal that more than half of the studied croplands experienced changes in the cropping systems, and 40% showed positive trends in terms of the number of growing crop cycles, being principally located near the main rivers where irrigation facilitates crop development during the dry season.

MOD
09A1
NDVI 500
TS 2001 - 2020
FILTERED
TS
PERIODOGRAM
CROPLAND
INTENSIFICATION

Copyright: Creative Commons Attribution 4.0 International