I am working on surafce salinity mapping on Irrigated areas inorder to investigate the effect of irrigation on salinity. Meanwhile, I would like to see the distribution of salts with in the root zone. I can't do it based on ground data as it is time consuming and costy. I am, thus, curious to know if it is possible to map sub surface salinity using satellite data.
Thank you Hanumantharao. Can you please send me some litratures on the topic.
Yes , very much possible
Cost effective and timely approaches are needed to enhance the quantitative analysis of soil salinity, mapping and modelling for improved monitoring. The use of broadband sensors for studying salt-affected soils is not satisfactory due to limited spectral information. The ground truth data of soil salinity from selected sampling points is tied to the corresponding pixels from the satellite image bands. Remotely sensed data based salinity indices (band combinations) and principal components using principal component analysis (PCA) are developed to find out the occurrence pattern of the salinization.
Hyperspectral remote sensing is promising to overcome the limitations of broadband sensors. The use of hyperspectral remote sensing for monitoring salt-affected soils still warrants more investigations. The use of land components delineated by object based image analysis from DEM’s has good potential for mapping saline soils. The integration of land components and spectral reflectance of vegetation/crops to study saline soils as soil properties are theoretically uniform within land components is promising. Hence, investigations on the value of using terrain attributes to identify saline prone areas should be conducted.
Spectral signatures defining various phases of soil salinity and sodicity , is perhaps , most important .
Find below some PDFs fro further reading
the salt content needs to be extracted from other soil and vegetation properties and possibly requires in situ calòibration on the same type of soil profile as in http://www.ncbi.nlm.nih.gov/pubmed/9419293
Yes indeed but using indirect cross-correlation methods. Read this - "A Simplified Sub-Surface Soil Salinity estimation using Synergy of Sentinel-1 SAR and Sentinel-2 multispectral satellite data, for early stages of wheat crop growth in Rupnagar, Punjab, India", Land Degradation and Development, (Wiley) 2021. Authors - Akshar Tripathi & Reet Kamal Tiwari
- Badges
- Science topic
- Similar topics
- Agricultural Science
- Environmental Science