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Saturday, 4 April 2020

Unconformity, Disconformities and Nonconformities in Structural Geology



What is Unconformity, Disconformities and Nonconformities in Structural Geology?





Unconformity


An unconformity is a contact between two rock units in which the upper unit is usually much younger than the lower unit . Unconformities are typically buried erosional surfaces that can represent a break in the geologic record of hundreds of millions of years or more . 



For example, the contact between a 400-million-year-old sandstone that was deposited by a rising sea on a weathered bedrock surface that is 600 million years old is an unconformity that represents a time hiatus of 200 million years. 

Wednesday, 1 April 2020

WETLAND AND WATER RESOURCE MODELING AND ASSESSMENT A Watershed Perspective



WETLAND  AND WATER RESOURCE MODELING  AND  ASSESSMENT A Watershed Perspective


Preface: Toward a Watershed Perspective



This is a book about the methods and geospatial techniques for modeling and assessing wetlands and water resources at the watershed scale.The theme of the book, wetland and water resource modeling and assessment, is an active field of research that constantly undergoes theoretical and technical innovations. This book emphasizes a watershed perspective in the modeling and assessment areas. 



Wednesday, 25 March 2020

INTRODUCTIONTO GEOGRAPHIC INFORMATION SYSTEMS



INTRODUCTIONTO GEOGRAPHIC INFORMATION SYSTEMS



by Kang-tsung Chang, 9th Edition

Preface of the Book



A geographic information system (GIS) is a computer system for storing, managing, analyzing, and displaying geospatial data. Since the 1970s GIS has been important for professionals in natural resource management, land use planning, natural hazards, transportation, health care, public services, market area analysis, and urban planning. It has also become a necessary tool for government agencies of all the levels for routine operations. More recent integration of GIS with the Internet, global positioning system (GPS), wireless technology, and Web service has found applications in location-based services, Web mapping, in-vehicle navigation systems, collaborative Web mapping, and volunteered geographic information.

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