Merits and Demerits of GIS and Geostatistical Techniques

2019 ◽  
pp. 17-21 ◽  
Author(s):  
C.R. Paramasivam
Keyword(s):  
Geostatistical Techniques

scholarly journals High-resolution ice-thickness mapping in South Greenland

2014 ◽  
Vol 55 (67) ◽  
pp. 64-70 ◽  
Author(s):  
M. Morlighem ◽  
E. Rignot ◽  
J. Mouginot ◽  
H. Seroussi ◽  
E. Larour
Keyword(s):  
High Resolution ◽  
Optimization Problems ◽  
Mass Conservation ◽  
Ice Thickness ◽  
Soft Constraint ◽  
Hard Constraint ◽  
Conservation Of Mass ◽  
Motion Data ◽  
Geostatistical Techniques ◽  
Thickness Measurements

AbstractAirborne radar sounding is difficult in South Greenland because of the presence of englacial water, which prevents the signal from reaching the bed. Data coverage remains suboptimal for traditional methods of ice-thickness and bed mapping that rely on geostatistical techniques, such as kriging, because important features are missing. Here we apply two alternative approaches of high-resolution (~300m) ice-thickness mapping, that are based on the conservation of mass, to two regions of South Greenland: (1) Qooqqup Sermia and Kiattuut Sermiat, and (2) Ikertivaq. These two algorithms solve optimization problems, for which the conservation of mass is either enforced as a hard constraint, or as a soft constraint. For the first region, very few measurements are available but there is no gap in ice motion data, whereas for Ikertivaq, more ice-thickness measurements are available, but there are gaps in ice motion data. We show that mass-conservation algorithms can be used as validation tools for radar sounding. We also show that it is preferable to apply mass conservation as a hard constraint, rather than a soft constraint, as it better preserves elongated features, such as glacial valleys and ridges.

scholarly journals Sampling grid density and lime recommendation in an Oxisol

2014 ◽  
Vol 18 (11) ◽  
pp. 1142-1148 ◽  
Author(s):  
Eduardo L. Bottega ◽  
Daniel M. de Queiroz ◽  
Francisco A. C. Pinto ◽  
Antonio M. de Oliveira Neto ◽  
Cesar C. Vilar ◽  
...  
Keyword(s):  
Soil Analysis ◽  
Sample Point ◽  
Brazilian Cerrado ◽  
Mato Grosso ◽  
Sampling Grid ◽  
Sampling Points ◽  
Regular Sampling ◽  
Geostatistical Techniques ◽  
Mato Grosso Do Sul ◽  
Kriging Maps

The objective of this study was to evaluate the influence of different sampling grids density in the lime requirements in an Oxisol. The experiment was conducted at a rural property located in Sidrolândia city, Mato Grosso do Sul state, in the Brazilian ‘Cerrado’. In the soil attributes mapping, regular sampling grid was used consisting of 99 points, spread over an area of 90 ha. Other two grids (51 and 27 points) were derived by deleting lines or lines and points from the original one. Based on the results of soil analysis, the lime requirement at each sample point was calculated. Using geostatistical techniques the spatial variability of lime requirement was studied and grid configuration for each sample was tested. By kriging, maps were made. By reducing the number of sampling points, 11% of the experimental area showed an overestimation and 8% underestimation comparing with the lime requirement made using the highest sampling grid density.

scholarly journals Guidelines for depth data collection in rivers when applying interpolation techniques (kriging) for river restoration

2007 ◽  
Vol 4 (3) ◽  
pp. 1069-1094
Author(s):  
M. Rivas-Casado ◽  
S. White ◽  
P. Bellamy
Keyword(s):  
River Restoration ◽  
Sampling Strategy ◽  
Spatial Dimension ◽  
Sampling Strategies ◽  
Depth Data ◽  
Cyclic Patterns ◽  
Efficient Sampling ◽  
Before And After ◽  
Geostatistical Techniques ◽  
River Site

Abstract. River restoration appraisal requires the implementation of monitoring programmes that assess the river site before and after the restoration project. However, little work has yet been developed to design effective and efficient sampling strategies. Three main variables need to be considered when designing monitoring programmes: space, time and scale. The aim of this paper is to describe the methodology applied to analyse the variation of depth in space, scale and time so more comprehensive monitoring programmes can be developed. Geostatistical techniques were applied to study the spatial dimension (sampling strategy and density), spectral analysis was used to study the scale at which depth shows cyclic patterns, whilst descriptive statistics were used to assess the temporal variation. A brief set of guidelines have been summarised in the conclusion.

scholarly journals Assessment of soil and soil-water salinity in Ben Tre province by electromagnetic technology

2020 ◽  
Vol 19 (4) ◽  
pp. 507-516
Author(s):  
Le Ngoc Thanh ◽  
Nguyen Quang Dung ◽  
Luu Hai Tung
Keyword(s):  
Electrical Conductivity ◽  
Soil Water ◽  
Ground Surface ◽  
Fold Increase ◽  
Water Salinity ◽  
Current Status ◽  
Soil Electrical Conductivity ◽  
Geostatistical Techniques ◽  
Data Point ◽  
Total Dissolved Solid

Assessment of soil and soil-water salinity is essential in agricultural production, therefore it is necessary to find out the non-costly, effective, rapid and reliable integrated methodology for this purpose. The paper presents the results of using the electromagnetic induction instrument EM31-MK2Ô in combination with collecting and analyzing soil and soil-water samples, and applying GIS and geostatistical techniques to assess the current status of soil and soil-water salinity in Ben Tre province. Apparent soil electrical conductivity ECa measured from ground surface to 6 m in depth increases from inland to the sea in northwest - southeast direction; ECa is closely related to topsoil salinity to 30 cm deep and to soil-water salinity at depth of 10–100 cm. Current status of soil and soil-water salinity in 2018 was assessed with a 4-fold increase in information, from 16 km2/data point to 4 km2/data point. Consequently four maps were established, consisting of electrical conductivity ECe and total solube salt TSS distributions of soil; electrical conductivity σw and total dissolved solid TDS distributions of soil-water.

scholarly journals Geostatistics and Structure from Motion Techniques for Coastal Pollution Assessment along the Policoro Coast (Southern Italy)

Geosciences ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 28 ◽  
Author(s):  
Cosimo Cagnazzo ◽  
Ettore Potente ◽  
Sabino Rosato ◽  
Giuseppe Mastronuzzi
Keyword(s):  
Structure From Motion ◽  
Southern Italy ◽  
Pollution Assessment ◽  
Processing Technique ◽  
Coastal Pollution ◽  
Coastal System ◽  
Physical Chemical ◽  
Aerial Vehicle ◽  
Geostatistical Techniques ◽  
Considerable Impact

The coastal system, with its physical chemical and biological components, is the place where the lithosphere, atmosphere and hydrosphere intersect and interact, and in which human activity has a considerable impact on the balance of the whole ecosystem. The aim of this study is to assess the health of the coastal environment in a natural protected area in Policoro (Italy). Sand samples have been collected and analysed to detect the presence of environmental contaminants and pollutants (heavy metals). A photogrammetric survey was carried out using an unmanned aerial vehicle (UAV), and an updated orthophoto of the area was obtained using the Structure from Motion (SfM) processing technique. Geostatistical techniques have been used to assess the distribution of the contaminants in the study area.

Delineation of trace metals contamination in groundwater using geostatistical techniques: A study on Dhaka City of Bangladesh

2019 ◽  
Vol 9 ◽  
pp. 100212 ◽  
Author(s):  
Md. Bodrud-Doza ◽  
Mohammad Amir Hossain Bhuiyan ◽  
S.M. Didar-Ul Islam ◽  
Shamshad B. Quraishi ◽  
Md.Iftakharul Muhib ◽  
...  
Keyword(s):  
Trace Metals ◽  
Dhaka City ◽  
Geostatistical Techniques
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