A novel method for enhancement of radiometric resolution using image fusion     

Ch. Venkateswara Rao  K.M.M. Rao  P. Shasidhar Reddy  Girish Pujar 《International Journal of Applied Earth Observation and Geoinformation》2008,10(2):165-1

The Resourcesat-I satellite is equipped with different types of sensors with varied characteristics. For the effective utilization of the available multi-sensor, multi-temporal, multi-spectral and multi-radiometric data from these sensors, fusion of digital image data has become a valuable technique. Image fusion enhances the information content and helps in better discrimination of various land cover types. The Resourcesat-1 has equipped with three sensors, AWiFS, LISS-III and LISS-IV, which are having identical spectral resolutions, with different spatial, radiometric and temporal resolutions. The spatial resolutions ratio of the data set for merging are required to be maximum of 1:6, where as the data sets (AWiFS and LISS-III) that are used in the current study are having the ratio of 1:2.5 approximately. A novel merging technique is designed, which retains the multi-spectral response of the input data in the output data. The merged data set provides the higher spatial and radiometric resolutions. In order to evaluate the fusion merits quantitatively, all the data sets are digitally classified and studied the output classes for homogeneity and clear discrimination. A comprehensive comparative study is carried out between the fused image and the LISS-III image based on the contingency matrix and the scatter plots, which demonstrates the strength of fused image for discriminating the object classes at 23.5 m spatial and 10-bit radiometric resolutions. The merged data set gives the improved classification accuracy.  相似文献   

Estimation of Above Ground Biomass Using Texture Metrics Derived from IRS Cartosat-1 Panchromatic Data in Evergreen Forests of Western Ghats,India     

R. Suraj Reddy  G. Rajashekar  C. S. Jha  V. K. Dadhwal  Raphel Pelissier  Pierre Couteron 《Journal of the Indian Society of Remote Sensing》2017,45(4):657-665

Assessment of above ground forest biomass (AGB) is essential in carbon modelling studies to provide mitigation strategies as demonstrated by reducing emissions from deforestation and forest degradation. Several researchers have demonstrated the use of remote sensing data in spatial AGB estimation, in terms of spectral and radar backscatter based approaches at a landscape scale with several known limitations. However, these methods lacked the predictive ability at high biomass ranges due to saturation. The current study addresses the problem of saturation at high biomass ranges using canopy textural metric from high resolution optical data. Fourier transform based textural ordination (FOTO) technique, which involves deriving radial spectrum information via 2D fast Fourier transform and ordination through principal component analysis was used for characterizing the textural properties of forest canopies. In the current study, plot level estimated AGB from 15 (1 ha) plots was used to relate with texture derived information from very high resolution datasets (viz., IKONOS and Cartosat-1). In addition to the estimation of high biomass ranges, one of the prime objective of the current study is to understand the effects of spatial resolution on deriving textural-AGB relationship from 2.5 m IRS Cartosat data (Cartosat-A, viewing angle = ?5°) to that of IKONOS imagery with near nadir view. Further, since texture is impacted by several illumination geometry issues, the effect of viewing geometry on the relationship was evaluated using Cartosat-F (Viewing angle = 26°) imagery. The results show that the FOTO method using stereo Cartosat (A and F) images at 2.5 m resolution are able to perform well in characterizing high AGB values since the texture-biomass relationship is only subjected to 18 % relative error to that of 15 % in case of IKONOS and could aid in reduction of uncertainty in AGB estimation at a large landscape levels.  相似文献   

Crustal structure of the west Bengal basin, India from deep seismic sounding investigations     

K. L. Kaila  P. R. Reddy  D. M. Mall  N. Venkateswarlu  V. G. Krishna  A. S. S. S. R. S. Prasad 《Geophysical Journal International》1992,111(1):45-66

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Developing a geographic expert system for regional mapping of volcanogenic massive sulfide (VMS) deposit potential     

R. K. T. Reddy  G. F. Bonham-Carter  A. G. Galley 《Natural Resources Research》1992,1(2):112-124

A personal computer-based geographic information system (GIS) is used to develop a geographic expert system (GES) for mapping and evaluating volcanogenic massive sulfide (VMS) deposit potential. The GES consists of an inference network to represent expert knowledge, and a GIS to handle the spatial analysis and mapping. Evidence from input maps is propagated through the inference network, combining information by means of fuzzy logic and Bayesian updating to yield new maps showing evaluation of hypotheses. Maps of evidence and hypotheses are defined on a probability scale between 0 and 1. Evaluation of the final hypothesis results in a mineral potential map, and the various intermediate hypotheses can also be shown in map form.The inference net, with associated parameters for weighting evidence, is based on a VMS deposit model for the Chisel Lake deposit, a producing mine in the Early Protoerzoic Snow Lake greenstone belt of northwest Manitoba. The model is applied to a small area mapped at a scale of 1:15,840. The geological map, showing lithological and alteration units, provides the basic input to the model. Spatial proximity to contacts of various kinds are particularly important. Three types of evidence are considered: stratigraphic, heat source, and alteration. The final product is a map showing the relative favorability for VMS deposits. The model is implemented as aFortran program, interfaced with the GIS. The sensitivity of the model to changes in the parameters is evaluated by comparing predicted areas of elevated potential with the spatial distribution of known VMS occurrences.  相似文献   

Sudden post-midnight decrease in equatorial F-region electron densities associated with severe magnetic storms     

D. R. Lakshmi  B. Veenadhari  R. S. Dabas  B. M. Reddy 《Annales Geophysicae》1997,15(3):306-313

A detailed analysis of the responses of the equatorial ionosphere to a large number of severe magnetic storms shows the rapid and remarkable collapse of F-region ionisation during post-midnight hours; this is at variance with the presently accepted general behaviour of the low-latitude ionosphere during magnetic storms. This paper discusses such responses as seen in the ionosonde data at Kodaikanal (Geomagn. Lat. 0.6 N). It is also observed that during magnetic storm periods the usual increase seen in the hF at Kodaikanal during sunset hours is considerably suppressed and these periods are also characterised by increased foF2 values. It is suggested that the primary process responsible for these dramatic pre- and post-midnight changes in foF2 during magnetic storms could be due to changes in the magnitude as well as in the direction of usual equatorial electric fields. During the post-midnight periods the change in electric-field direction from westward to eastward for a short period causes an upward E × B plasma drift resulting in increased hF and decreased electron densities in the equatorial region. In addition, it is also suggested that the enhanced storminduced meridional winds in the thermosphere, from the poles towards the equator, may also cause the decreases in electron density seen during post-midnight hours by spatially transporting the F-region ionisation southwards away from Kodaikanal. The paper also includes a discussion on the effects of such decreases in ionisation on low-latitude HF communications.  相似文献   

Hydrogeochemical processes of fluoride enrichment in Chimakurthy pluton,Prakasam District,Andhra Pradesh,India     

A. G. S. Reddy  D. V. Reddy  M. Sudheer Kumar 《Environmental Earth Sciences》2016,75(8):663

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Reimagining e-waste circuits: calculation,mobile policies,and the move to urban mining in Global South cities     

Rajyashree N. Reddy 《Urban geography》2016,37(1):57-76

In this article, I describe how calculative practices of enumeration and visualization mobilized by policy actors to govern the multiple mobilities of e-waste and its re-materialization as value in the informal-recycling economies of Global South cities have resulted in e-waste being recalibrated as an “urban mine.” To properly govern and fully exploit e-waste qua urban mines, policy actors have developed the Best-of-2-Worlds (Bo2W) model. I show that the antecedent of the Bo2W model is the Clean e-Waste Channel implemented in Bangalore, India’s “Cyber City,” which has retroactively been recast as the first successful implementation of the Bo2W model. While policy actors mobilize Bangalore’s success to boost this model and facilitate its mobility to other Global South cities, I conclude by offering a critical assessment of the Bo2W model for the prospects of informal recyclers in Global South cities and the creation of uneven geographies of e-waste toxicity.  相似文献   

Estimation of daily average net radiation and its variation over West Bengal,India using MODIS products     

Dibyendu Dutta  Prachi Goel  Manisha Singh  Vinay Kumar Dadhwal  Rodda Suraj Reddy 《国际地球制图》2017,32(3):286-297

A simple and exclusively satellite-based instantaneous net radiation (INR) and its components have been estimated and it is based on the method proposed. The method has been used to check its suitability over West Bengal, India on clear sky days which is eliminating the need for ground-based observations. The method explicitly recognizes the need for spatially varied input parameters to estimate net radiation using remote sensing information and provides a distributed daily average net radiation map with finer spatial resolution. The satellite-derived radiative flux components were compared with the Eddy Flux Tower measurements located at Bonnie camp within mangrove forest. The bias, root-mean square error and R² between modelled and measured INR are 52.07, 49.5 W m^?2 and 0.74, respectively which are within the acceptable limit. The errors in the downward short wave and long wave as well as upward short-wave and long-wave radiative flux are 13.78, 3.54, 12.41 and 3.54%, respectively. Further, variations of all the radiative flux components were analysed over different eco-systems.  相似文献   

Geospatial Analysis of Reed Bamboo (<Emphasis Type="Italic">Ochlandra travancorica</Emphasis>) Invasion in Western Ghats,India     

Kalloli Dutta  C. Sudhakar Reddy 《Journal of the Indian Society of Remote Sensing》2016,44(5):699-711

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The North Cape oil spill: hydrocarbons in Rhode Island coastal waters and Point Judith Pond.     

C M Reddy  J G Quinn 《Marine environmental research》2001,52(5):445-461

On 19 January 1996, the North Cape oil barge ran aground near Moonstone Beach, RI, and spilled over 2700 metric tons of No. 2 fuel oil during a severe winter storm. High winds and rough seas drove the oil into the water column, and the oil spread throughout Block Island Sound and into several coastal salt ponds. Over 50 water samples were collected from Point Judith Pond (PJP) and the southern coast of Rhode Island for four months after the spill and analyzed for polycyclic aromatic hydrocarbons (PAHs) and total petroleum hydrocarbons (TPHs). These analyses revealed that at least 60 km2 of coastal waters were impacted from the spill. Maximum concentrations of sigmaPAHs and TPHs were 115 and 3940 microg l(-1), respectively. The percentage of sigmaPAHs relative to the TPHs for all samples varied from 0.2 to 43%, showing that there was no clear relationship between sigmaPAHs and TPHs for the whole dataset and likely resulting from spatial and temporal partitioning over the course of the spill. However, within the dataset, there were stronger correlations for distinct samples collected at similar locations and times. In PJP, water column concentrations of individual PAHs decreased at rates of 0.08-0.24 day(-1) and lower-molecular weight PAHs were removed faster than higher-molecular weight PAHs.  相似文献