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Words List   (D)
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   daily range of temperature  
Subject: The Earth
    The difference between the maximum and minimum temperatures for any given day.
 
 
  
   Dam  
Subject: Geography
    Structure built in rivers or estuaries, basically to separate water at both sides and/or to retain water at one side.


more
 
 
  
   Damkjermanite  
Subject: rock
    Damkjermanite is a calcite bearing ultramafic lamprophyre.
 
 
  
   Darcy  
Subject: Resources & Reserves
    A standard unit of permeability, equivalent to the passage of one cubic centimeter of fluid of one centipoise viscosity flowing in one second under a pressure diffrential of one atmosphere through a porous medium having an area of cross section of one square centimeter and a length of one centimeter. Reference: R.L. Bates & J.A. Jackson, DICTIONARY OF GEOLOGICAL TERMS, Third Edition, American Geological Institute, 1983.
 
  
   Dark silicate  
Subject: Geology
    Silicate minerals containing ions of iron and/ or magnesium in their structure. They are dark in color and have a higher specific gravity than nonferromagnesian silicates. Reference : Tarbouk, E.J. & F.K. Lutgens, (2006), EARTH, 8th edition, Pearson Education International.
 
 
  
   dasymetric  
Subject: The Earth
    a method proposed by John K. Wright to estimate densities using areal interpolation and quantitative puzzle-solving; more generally, a type of thematic map whose boundaries are conditioned by some other distribution.
 
 
  
   Data Collection System (DCS)  
Subject: Remote Sensing
    DCS units are flown on both GOES and NOAA polar-orbiting spacecraft. They gather and relay data from both mobile and stationary platforms at various locations. DCS units on NOAA satellites can also determine the precise location of moving platforms at the time the data were acquired. Ref: Remote Sensing Glossary Reference Information for Virtual Nebraska
 
 
  
   data dictionary   
Subject: The Earth
    detailed definitions of the codes employed for identifying objects and for attribute values.
 
 
  
   data model   
Subject: The Earth
    In the database literature 1) general description of sets of entities and the relationships between these sets of entities (Ullman 1982) 2) collection of object types, collection of operators on those object types and a collection of integrity constraints (Codd 1981). [Integrity constaints are the axioms of a data model.] In a GIS, composed of a measurement framework and scheme for representation.
 
 
  
   Data rate   
Subject: Remote Sensing
    The amount of information transmitted per unit time. Ref: Remote Sensing Glossary Reference Information for Virtual Nebraska
 
 
  
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