Textbook: Slocum,
T. A. 1999. Thematic Cartography and
Visualization. Prentice Hall: New Jesey.
URL :
https://www.angelfire.com/mo/yagoub
Chapter 9: Symbolizing Smooth Continuous Phenomena
List the methods used
to symbolizing smooth continuous
phenomena, illustrate by figures? (see Figure 9.1, page 155).
1. Contour lines
2. Hyposmetric tints (shading areas
between contour lines)
3. Continuous-tone maps (shades
analogous to those used on un-classed choropleth maps).
4. Fishnet symbolization (a net like
structure that simulates the three dimensional character of smooth continuous
surface)
What is difference
between slope and aspect?
Slope considers the steepness of the land surface (e.g. 20%, 1 in
20). While aspect deals with the direction of the land faces (e.g. north,
south).
Define dasymetric map,
cartogram, and flow map, illustrate by figures?
Dasymetric map: is constructed by using area
symbols to represent zones of uniformity. Dasymetric map is similar to
choropleth map, but the boundary of zones are based on ancillary variables, and
thus need not match enumeration unit boundaries (Figure 10.1, page 169). As
with choropleth maps, only standardized data should be mapped with Dasymetric
method.
Cartogram: is a map in which spatial geometry
is purposely distorted to reflect a theme, for example, sizes of countries may
be made proportional to the population of each country (Figure 11.9, page 182).
Flow map: is used to depict the movement of
phenomena between geographic locations (e.g. migration and transportation of
goods) (Figure 11.3, page 185, plate 14).
List the new tools
that are used to enhance visualization of spatial data?
1. fly-by or fly-through
2. Animation (change in position or
attribute, Plate 22/23/27 )
3. Virtual reality (realistic
representations of the earth's natural and built environment)(see Plate
31/32) see also
(http://www.clr.utoronto.ca:1080/links/gisw/origarticle.html).
4.
Use of sound to represent spatial data (sonification or acustic visualization
e.g. use of high and low sounds according to the magnitude of phenomena
and in directing a car) ( see Plate 29).
