Soil and groundwater, both finite and invaluable natural resources, play fundamental roles in supporting ecosystems, regulating water cycles and sustaining agricultural productivity. However, the growing global demand for raw materials, food and energy, has intensified pressure on land, resulting in resource depletion, soil degradation and groundwater depletion (
Cronin, 2009).
Prasad (2004) emphasized that soil degradation in India threatens food security, urging urgent measures to protect soil health and here soil survey and soil classification help in better understanding of their characteristics, constraints and potential. Effective management of these resources is essential to maintain environmental sustainability, particularly in the face of climate change and land degradation. Soil, as the foundation of all production systems, exhibits significant spatial variability of variety of soil properties depending on spatial locations. Understanding its characteristics, spatial distribution and quality is crucial for ecosystem balance (
Gessler, 1996). In this regard, soil survey is a potential tool which provides a systematic and scientific understanding of different soil types, their characteristics and distribution, enabling predictions about their potential uses (
Mandal and Sharma, 2005). These surveys also classify soils and offer valuable insights that enhance natural resource management.
Groundwater a vital source of irrigation and human consumption, also require careful management. In regions, where irrigation is crucial, groundwater depletion poses a significant challenge. Additionally, issues such as soil salinization and pollution from solid waste further degrade soil health, necessitating monitoring and remediation efforts. Traditional methods of assessing soil and groundwater quality, although valuable, are time consuming, labour intensive and expensive (
Laake, 2000). These conventional techniques are limited in their ability to capture spatial variability of soil properties and groundwater dynamics across large areas.
Recent advancements in geospatial technologies, particularly Geographical Information System (GIS), Remote Sensing (RS) and also Digital Soil Mapping (DSM), have revolutionized how soil and ground water are characterized, monitored and managed. These technologies allow for more efficient, precise and comprehensive approaches to natural resources management by integrating high resolution satellite imageries, with machine learning, geostatistics and advanced modelling techniques (
Yeung and Lo, 2002;
Shrestha, 2006). The integration of RS and GIS not only accelerates soil and groundwater mapping processes but also enhances the detail and accuracy of the data, reducing time and cost involved
(Kalra et al., 2010). Such advancements offer significant potential to address growing challenges related to land degradation, soil salinization and ground water depletion, while promoting sustainable resource use.
In this review article, we explore the role of advanced geospatial techniques in soil survey, RS and GIS in soil resource mapping and characterization, groundwater mapping and discuss the application in addressing the pressing issues of land degradation, resource depletion and environmental sustainability.
RS and GIS in terrain characterization
Traditionally, landform mapping relied on aerial photograph interpretation (
Dent and Young, 1981). With remote sensing, more accurate resource mapping is possible
(Karale et al., 1988). Satellite data and GIS enable spatial analysis, aiding in erosion risk assessment, watershed characterization and soil conservation. Drainage morphometry offers insights into land resource distribution (
Strahler, 1964). Topographical variations significantly influence soil variability, necessitating geomorphological understanding and field surveys
(McBratney et al., 2000; Velmurugan and Carlos, 2009). Satellite imagery and topographic maps help delineate physiographic variations like slope and land-cover (
Speight, 1990). High-resolution satellite data improve geographic unit inventories. IRS-ID LISS-III data enhances geomorphological delineation by integrating lithology, drainage and contour information. Soil-landform units exhibit homogeneity in parent material, influencing soil-geomorphic processes (
Wilson and Gallant, 2000;
Hengl and Reuter, 2008). Digital Elevation Models (DEMs) enhance slope classification for soil surveys
(Hammer et al., 1995). DEM-derived terrain attributes effectively delineate soil boundaries
(McBratney et al., 2003). Integrating high-resolution satellite data, GIS and field validation improves terrain characterization and soil inventory in a toposequence
(Reddy et al., 2012).
RS and GIS in soil resource mapping and characterization
Soil is a vital resource requiring efficient management for sustainable agriculture. Soil mapping spatially defines soil types (
Abuzar and Ryan, 2001) and high-resolution satellite data enables detailed assessment of soil distribution and challenges. Advances in technology have improved soil mapping methods
(Borse et al., 2018; Ingle et al., 2019; Kuchnwar et al., 2021). Spatial databases aid planning and development assessments using repeated satellite coverage. Satellite imagery reduces soil mapping time by 60-80% compared to manual methods
(Liengsakul et al., 1993). Ingle et al., (2018) used geostatistics and GIS-based kriging to assess soil fertility, revealing high spatial variability in organic carbon and potassium levels for site-specific management.
Mondal et al., (2020) assessed spatial variability of available phosphorus under three landuses using geostatistics, revealing highest variability in poplar-wheat system and strong spatial dependence using nugget-sill ratio of semi-variogram. They also assessed spatial variability of Soil Organic Carbon (SOC) under three landuses (berseem, rice-wheat and poplar-wheat) using geostatistics and found highest SOC in poplar-wheat and also identified Gaussian, spherical, exponential models as best fitting semi-variogram models in respective landuse systems
(Mondal et al., 2021). Researchers highlight the effectiveness of satellite data Indian Remote Sensing (IRS-P6) (
Velmurugan and Carlos, 2009) and IRS-P6, Linear Imaging Self-Scanning Sensor (LISS-IV)
(Hiese et al., 2011, Reddy et al., 2012) for large-scale soil mapping. Panchromatic (PAN) merged satellite data provide detailed soil inventories
(Walia et al., 2010). RS and GIS are powerful tools for soil characterization (
Srivastava and Saxena, 2004;
Reddy et al., 2008; Pareta and Pareta, 2012). GIS-based soil information supports developmental projects and agricultural research (
Ramakrishnan and Guruswamy, 2009). Improved soil mapping enhances land-use planning, aiding farmers in sustainable land management
(Scull et al., 2003).
Role of RS and GIS in soil survey
RS and GIS have revolutionized soil surveys by providing high-precision mapping tools and detailed spatial analysis. Traditional methods are labour-intensive, whereas RS and GIS enable efficient soil characterization. High-resolution imagery, such as PAN and LISS III, is invaluable for updating cadastral maps, aiding local land management (
Barnes and Eckl, 1996). Satellite images facilitate soil series delineation, improving planning and resource allocation
(Karale et al., 1988). RS allows large-area coverage with high spatial resolution, supporting soil-landscape relationship studies. Physiographic mapping combines topographic maps with satellite imagery, using spectral variations for classification (
Velmurugan and Carlos, 2009). Global Positioning System (GPS) integration enhances soil surveys by providing precise location data, minimizing errors and improving field verification
(Stombaugh et al., 2002). High-resolution GPS data refines soil profile mapping and supports accurate classification
(Longley et al., 1999; Panhalkar, 2011).
Post-survey, GIS organizes soil databases, enabling spatial analysis and overlay with thematic layers such as landuse and hydrology (
Burrough and McDonnell, 1998). GIS tools assist in land capability classification, soil resource mapping and land degradation assessment (
Ekanayake and Dayawansa, 2003). Integrating RS, GPS and GIS enhances soil mapping precision and supports sustainable land management.
Prasad (2021) emphasized the significance of geospatial technologies, noting that multi-spectral and multi-temporal RS data improve accuracy, cost-effectiveness and efficiency in soil surveys. These tools are essential for addressing soil variability, land degradation and resource management challenges.
Practical utility of RS data for micro-level planning
Geo-spatial technology is crucial for sustainable watershed management, aiding in resource mapping, monitoring and prioritization
(Khan et al., 2001; Gosain and Rao, 2004;
Borse et al., 2018; Ingle et al., 2019; Kuchnwar et al., 2021). RS and GIS techniques help analyze watershed morphometry (
Agarwal, 1998;
Biswas et al., 1999) and support land-use planning. PAN merged with LISS III and IV data has been widely used for watershed characterization (
Singh, 2009;
Vittala et al., 2010; Das et al., 2012; Shanwad et al., 2012). Cartosat-1 stereo data aids in DEM construction for watershed demarcation and mapping
(Kumar et al., 2008; Mohamed and Murthy, 2008;
Sharma et al., 2010; Pareta and Pareta, 2012). Summary of different satellites used in micro-level planning is listed in Table 1.
Soil suitability mapping
Soil suitability is essential for maximizing the use of available land resources to support sustainable agricultural production
(Hanna et al., 2000; Ekanayake and Dayawansa, 2003). The advent of high-resolution satellite imagery, coupled with GIS-based terrain analysis, has significantly expanded and improved the efficiency of soil suitability mapping. This method focuses on soil characteristics, climate, landuse and topography, with the assumption that these factors vary continuously across space (
Lagacherie and McBratney, 2007). Recently, soil suitability for millets in Banka district has been done by
Vimal et al., (2024). Karthika et al., (2024) used Sentinel-2 data in characterization of soil resources for sorghum suitability in Mahbubnagar, Telangana and reported that only 1.51% area was highly suitable and 33.99% area was marginally suitable due to soil limitations. The spatial data can be easily visualized and analysed within a GIS framework.
Singha and Swain (2016) reviewed land suitability analysis methods, highlighting the effectiveness of integrating GIS, remote sensing, fuzzy logic and Analytic Hierarchy Process (AHP) for optimizing agricultural landuse planning. Several researchers have created soil suitability maps using multi-criteria evaluation techniques, along with Quick Bird (60 cm) and LISS-IV imagery (
Ceballos-Silva and Lopez-Blanco, 2003), while (
Ingle et al., 2021, 2024) employed IRS-P6 LISS-III, LISS-IV satellite data for land suitability assessments of watershed for cotton depicted in Fig 1.
RS in digital soil mapping
Understanding the spatial variation of soil properties is crucial for effective soil management
(Mondal et al., 2024). High-resolution soil mapping is essential, as conventional methods fail to capture soil variability and require extensive sampling, making them costly and time-consuming. Digital Soil Mapping (DSM) addresses these limitations by integrating remote sensing data with statistical, geostatistical, Machine Learning (ML) and Deep Learning (DL) models to predict soil properties at unsampled locations
(Hengl et al., 2014; Ma et al., 2019).
DSM utilizes the SCORPAN (S=Soil, C=Climate, O=Organisms, R= Relief, P=Parent material, A=Age, N=Spatial location) framework, incorporating soil samples and environmental variables to improve prediction accuracy
(Batjes et al., 2020). Techniques like regression kriging enhance interpolation
(Wang et al., 2022), while ML models outperform geostatistics in capturing non-linear relationships (
Taghizadeh-Mehrjardi et al., 2021). DL, with its multilayer neural networks, excels in large-scale mapping by extracting complex patterns from remote sensing data
(Behrens et al., 2018; Padarian et al., 2019). Prediction uncertainty is evaluated using prediction intervals
(Wadoux et al., 2020).
DSM is widely used to map soil properties such as moisture
(Das et al., 2023; Mondal et al., 2024), pH (
Pahlavan-Rad and Akbarimoghaddam, 2018), electrical conductivity (Ranjbar and Jalali, 2016) and organic carbon
(Mponela et al., 2020). Global-scale digital maps like the Global-Soil-Map aid in soil characterization
(Arrouays et al., 2014; Poggio et al., 2021). In India, national and regional DSM initiatives have mapped soil texture, pH, SOC and micronutrients, supporting site-specific nutrient management and sustainable agriculture
(Dharumarajan et al., 2017; Santra et al., 2017; Reddy et al., 2021; Dasgupta et al., 2023).
RS in soil salinity mapping
Soil salinity is a major land degradation issue, especially in arid, semi-arid and sub-humid regions (
Dehni and Lunis, 2012). It results from natural processes like mineral weathering and seawater intrusion, but human activities, particularly poor irrigation practices, exacerbate the problem (
El-Rawy et al., 2024). Climate change is expected to intensify soil salinity, further threatening agriculture
(Lekka et al., 2024). Traditional soil salinity assessment methods are costly and time-consuming (
El-Rawy et al., 2024), necessitating advanced geospatial technologies. Earth observation (EO) and RS provide efficient, large-scale soil salinity mapping (
Dehni and Lunis, 2012). Satellite sensors like Landsat Thematic Mapper (TM), Enhanced Thematic Mapper (ETM), Operational Land Imager (OLI) and IRS LISS-III integrate with GIS for accurate mapping. Spectral indices such as the Salinity Index (SI) and Normalized Difference Salinity Index (NDSI) are commonly used for soil salinity classification. Recent advancements in ML and DL enable digital soil salinity mapping by incorporating topographic and hyperspectral RS data. Google Earth Engine (GEE) is increasingly used for soil salinity analytics, with studies demonstrating the effectiveness of ML models like random forest and support vector machine
(Aksoy et al., 2022). Artificial Neural Network (ANN) models help analyze soil-water-salt dynamics
(Zickus et al., 2002; Rahouma and Aly, 2020), while Convolution Neural Network (CNN)-based DL models enhance soil salinity mapping (
El-Rawy et al., 2024). Integrating geospatial technology with ML and DL facilitates efficient, large-scale soil salinity monitoring, supporting sustainable agricultural management.
RS in detection, monitoring and mapping of dumping/waste disposal sites
Accurate identification and mapping of illegal dumping sites are essential to mitigate environmental hazards triggered by climate change
(Fraternali et al., 2024). Poorly managed sites emit greenhouse gases, degrade air quality and cause leachate contamination, threatening ecosystems and human health
(Alberti et al., 2022). Traditional on-site inspections are costly and time-consuming, but RS offers a cost-effective solution for monitoring landfill sites
(Fraternali et al., 2024).
Drone-based RS enables detailed local-scale mapping, while satellite RS provides large-area coverage. EO satellites, such as Sentinel and Landsat, capture multispectral and hyperspectral imagery, offering high spatial and temporal resolution for landfill monitoring (
Jutz and MilagroPerez, 2018). Landsat-8 and Landsat-9 with OLI and Thermal Infrared Sensors (TIRS) and Sentinel-1’s microwave data, are widely used for detecting land-cover changes, stressed vegetation and surface temperatures
(Gill et al., 2019). India’s IRS series and European Space Agency’s (ESA’s) Sentinel-2 provide free high-resolution optical data for large-scale monitoring. Meanwhile, WorldView and GeoEye-1 offer very high-resolution images suited for small-scale urban waste sites
(Fraternali et al., 2024).
RS-derived indices like Normalized Difference Vegetation Index (NDVI) and Soil Adjusted Vegetation Index (SAVI) detect poor vegetation health linked to landfill presence, while Land Surface Temperature (LST) is used for identifying heat anomalies in dumping areas
(Cadau et al., 2013). Multi-factor analysis integrates geospatial data to assess environmental impacts (
Abou El-Magd et al., 2022). Techniques like feature extraction, object classification and computer vision enhance landfill site detection and mapping (
Seror and Portnov, 2018;
Nazari et al., 2020).
RS and geospatial technology in groundwater mapping
Groundwater, constituting 26% of Earth’s freshwater, is vital for drinking, agriculture and industry
(Arulbalaji et al., 2019). Its significance is higher in arid, semi-arid and mountainous regions with scarce surface water
(Algaydi et al., 2019). Groundwater meets 40% of agricultural, 30% of industrial and half of the drinking water needs globally (
Famiglietti, 2014). However, traditional assessment methods are costly, time-consuming and fail to capture key sub-surface dynamics (
Kumar and Krishna, 2018;
Acharya et al., 2019). Geospatial technologies, particularly RS and GIS, provide cost-effective solutions for mapping groundwater potential and scarcity zones
(Rampheri et al., 2023; Bennett, 2025). RS offers critical hydrological data like soil moisture, vegetation conditions and land surface displacement
(Hilbich et al., 2022). Satellite and drone-based RS enhance groundwater storage assessment
(Adams et al., 2022), aiding in delineating groundwater zones and monitoring fluctuations
(Ni et al., 2018; Akhter et al., 2021; Sreekanth et al., 2023). In India, integrating geospatial and geophysical techniques with RS data identified groundwater potential in Dehradun using the Weighted Index Overlay method and 2D Electrical Resistivity Tomography
(Gyeltshen et al., 2020). RS-derived elevation models further aid in groundwater storage analysis
(Massoud et al., 2021). Multispectral and hyperspectral RS helps assess land surface and soil spectral properties influencing groundwater occurrence
(Kumar et al., 2022). While RS supports large-scale monitoring, limitations like sensor resolution and atmospheric variability necessitate refined methodologies to improve accuracy in groundwater mapping.