Accession Number : ADA257770
Title : The Division of a Circle or Spherical Surface Into Equal-Area Cells or Pixels.
Descriptive Note : Interim rept.,
Corporate Author : PHILLIPS LAB HANSCOM AFB MA
Personal Author(s) : Gringorten, Irving I ; Yepez, Penelope J
Report Date : 30 Jun 1992
Pagination or Media Count : 11
Abstract : The need to partition a circular area into many equally sized cells or pixels had arisen in several problems dealing with mapping phenomena within a circle. A radar picture of the horizontal extent of precipitation surrounding a station is usually of the circular area surrounding the station within approximately 192 kilometers (120 miles) radius. The radar picture is conveniently analyzed by the presence or absence of a radar echo in each small cell within the circle. Since the spherical surface of the earth can be portrayed on an equal-area map, the proposed method of dividing the circle into equally sized pixels is especially applicable for detailed mapping of a spherical surface such as the northern hemisphere.
Descriptors : *MAPPING , *RADAR MAPPING , PRECIPITATION , CIRCLES , NORTHERN HEMISPHERE , EARTH SURFACE , PIXELS
Subject Categories : Cartography and Aerial Photography
Distribution Statement : APPROVED FOR PUBLIC RELEASE