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Beale, J.E.P.; Grabowski, R.C.; Vercruysse, K.

Riparian vegetation dynamics in the Beas and Sutlej catchments, India, 1989-2020

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https://doi.org/10.5285/9a96e199-34d0-46f9-9a64-140d300a2531
The data comprises river section, zone and test site delineation, winter Season average NDVI by section and zone 1989-2020, land cover maps seasonally 1989-2020, and derived land cover fractions by section and zone 1989-2020. The data was produced as part of a study to determine how changes in geomorphic form and dynamics due to human alteration to river flows and riparian land management relate to changes in vegetation communities in the Sutlej and Beas Rivers, India. Vegetated and other land cover, including water area, were quantified by winter season NDVI trends (in the plains of Punjab) and seasonal supervised classification of Landsat data for over a 30-year period. The work was supported by the Natural Environment Research Council (Grant NE/S01232X/1).
Publication date: 2022-04-25
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More information

View numbers valid from 01 June 2023 Download numbers valid from 20 June 2024 (information prior to this was not collected)

Formats

Comma-separated values (CSV), Shapefile, TIFF

Spatial information

Study area
Spatial representation types
Raster
Tabular (text)
Vector
Spatial reference system
WGS 84

Temporal information

Temporal extent
1989-01-01    to    2020-12-31

Provenance & quality

Winter season Landsat 5, 7 and 8 top of atmosphere (TOA) images between 1989 and 2020 were processed in Google Earth Engine (GEE) using images from the winter season (January to March). Cloudy pixels were masked by the algorithm provided in GEE for analysis of Landsat data. NDVI and mNDWI were calculated at each pixel, then averaged across all images to produce an image of winter season mean values. Those pixels with mean mNDWI > 0.15 (water surface) were excluded from the NDVI analysis. For each combination of section and zone, a spatially averaged, mean winter season NDVI was calculated for each year using GEE zonal statistics functions.
Landcover classification maps were created in GEE, using the same Landsat images as the NDVI analysis, by Gradient Tree Boost classifier with 10 decision trees. The raw data comprised the blue, green, red, NIR, SWIR1 and SWIR2 channels (bands 1-5 and 7 of Landsat 5/ 7 and bands 2-7 of Landsat 8). The classification was repeated for all seasons; winter (January to March), pre-monsoon (April to June), monsoon (July to September) and post-monsoon (October to December). The bands were averaged within each season using all the available cloud-free images.

The training datasets were created by manual inspection of the visible band colour images for each year of the 32-year record, identifying locations that were invariant in landcover. The classes and training locations are summarised in the supplementary information. Separate training sets (locations provided in .csv files) were used for map creation below the dams (Sutlej and Beas) and above the Pong Dam (Beas only) to mitigate effects due to differing spectral characteristics of soil and vegetation due to topography.

Taking each image in turn, as the output of the supervised classification process, the number of pixels within each section and zone were counted by landcover class. These counts were divided by the total pixel count in each area to obtain a fractional landcover for each class, by section and zone. This process was also repeated for the three test sites without differentiation into zone or section.

Quality control: Landsat satellite data was used to collect provide information on spectral surface reflectance, respectively. These data are accompanied by quality assessment bands which were used to select det afro processing, particularly with respect to obtaining cloud-free images. Processing was conducted by the project team, with using statistical analysis (such as consumer’s accuracy) and spot validation against aerial satellite photography. Data were checked for errors at all stages by members of the project team at Cranfield University.

Licensing and constraints

This dataset is available under the terms of the Open Government Licence

Cite this dataset as:
Beale, J.E.P.; Grabowski, R.C.; Vercruysse, K. (2022). Riparian vegetation dynamics in the Beas and Sutlej catchments, India, 1989-2020. NERC EDS Environmental Information Data Centre. https://doi.org/10.5285/9a96e199-34d0-46f9-9a64-140d300a2531

Correspondence/contact details

Grabowski, R.C.
Cranfield University
 r.c.grabowski@cranfield.ac.uk

Authors

Beale, J.E.P.
Cranfield University
Grabowski, R.C.
Cranfield University
Vercruysse, K.
Cranfield University

Other contacts

Rights holder
Cranfield University
Custodian
NERC EDS Environmental Information Data Centre
 info@eidc.ac.uk
Publisher
NERC EDS Environmental Information Data Centre
 info@eidc.ac.uk

Additional metadata

Topic categories
geoscientificInformation
Keywords
Fluvial geomorphology , geomorphology , land cover , Landsat , NDVI , remote sensing , vegetation
Funding
Natural Environment Research Council Award: NE/S01232X/1
Last updated
05 March 2024 08:39