Results 181 to 190 of about 2,181,373 (224)

Illuminated Choropleth Maps

Annals of the Association of American Geographers, 2010
Choropleth maps are commonly used to show statistical variation among map enumeration units. Mapmakers take into account numerous considerations and make many decisions to produce a product that will effectively communicate spatially complex information to the map user. One design consideration is the choice between classed or unclassed choropleth maps.
James Stewart, Patrick J. Kennelly
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APPLICATIONS OF BIVARIATE CHOROPLETH MAPS

SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings, 2011
Since their appearance two centuries ago, choropleth maps have become the most widely used map type for quantitative thematic cartography. Basic principle is the – typically classified – aggregation of data over regions previously defined (e.g. administration districts, distribution areas, etc.).
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Choropleth Map Production by Facsimile

The Cartographic Journal, 1978
Abstract A continuous tone image can be produced by facsimile to simulate the various shaded patterns of a choropleth map. The image can be subsequently screened for half-tone reproduction. Up to 255 hues of tone can be reproduced. The facsimile technique removes the need for finding manufactured tones whose visual intensity is closely proportional to ...
Jean-Claude Muller, John L. Honsaker
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Parallel optimal choropleth map classification in PySAL

International Journal of Geographical Information Science, 2013
In this article, we report on our experiences with refactoring a spatial analysis library to support parallelization. Python Spatial Analysis Library PySAL is a library of spatial analytical functions written in the open-source language, Python.
Sergio J. Rey, Luc Anselin, Robert Pahle, Xing Kang, Philip Stephens   +4 more
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Issues of Change Detection in Animated Choropleth Maps

Cartographica, 2009
One primary utility of animated maps is their ability to depict change over time and space; unfortunately, recent research suggests that humans frequently fail to perceive changes within dynamic graphics. However, different types of dynamic graphics include different manifestations of change.
Kirk Goldsberry, Sarah Battersby
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Knowledge Acquisition from Choropleth Maps

Cartography and Geographic Information Systems, 1993
Today's computer graphics technology enables map users to acquire spatial knowledge in ways not possible with traditional static displays; for example, classes of data on a choropleth map can be sequenced from low to high values. Although sequencing and related approaches are often judged to be novel and exciting, it is unknown whether such approaches ...
Terry A. Slocum, Stephen L. Egbert
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Unclassed Choropleth Maps Revisited/Some Guidelines For The Construction Of Unclassed And Classed Choropleth Maps

Cartographica, 1994
The debate over the value of unclassed versus classed choropleth maps is revisited and updated in light of new research which confirms the communicative effectiveness of unclassed maps. A resolution-independent algorithm for continuous tone unclassed maps is introduced and some guidelines are suggested for the appropriate use of both classsed and ...
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VISUAL AND STATISTICAL COMPARISON OF CHOROPLETH MAPS

Annals of the Association of American Geographers, 1977
ABSTRACT It may be possible to make the visual similarity of a set of maps conform to the statistical intercorrelations among the variables used to produce the maps. Conceptualizing the intercorrelations as the signal and blackness differences as noise, three sets of maps were produced allowing blackness differences to vary for the first and second'set
ROBERT LLOYD, THEODORE STEINKE
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Unclassed Animated Choropleth Maps

The Cartographic Journal, 2007
Abstract The potential of unclassed animated choropleth maps as a solution to false patterns of geographic change arising from data classification is investigated. Old concerns about unclassed choropleth maps may be mitigated through map interactivity that offers four advantages over traditional data legends, and previous insights from testing static ...
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JUDGING THE SIMILARITY OF CHOROPLETH MAP IMAGES

Cartographica, 1983
An experiment was conducted to determine if people can form mental images of choropleth maps, if they can compare map patterns on those images, and if they make the comparisons in the same way that people make visual comparisons of map patterns. Subjects committed choropleth maps to memory and were given experience in the use of these images to make ...
THEODORE STEINKE, ROBERT STEINKE
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