• Introduction
• The Utility of Maps
• Producing Displays
• Point Symbolization
• Line Symbolization
• Choropleth Symbolization
• Graduated Symbol
• Grid Symbolization
• Dot Density Symbolization
• Isopleth Symbolization
  • Monovariate
  • Bivariate Monochrome
  • Bivariate Color
  • Multivariate
• Thematic Mapping
• References
• Index
• Author Index
• Symbol Index
• Site Map

Bivariate Symbolization

Monochrome bivariate isoline maps can be generated by changing the line shape, texture, size, value, etc of the current line and using the monovariate line AML to draw a second isoline coverage.

Ratio Data and Ordinal Data--Surface Shaded with Value

Figure 9.1c: SFV.aml Value shaded surface. This can be used hypsometric tinting, as well as the display of meta-data.

Both polygon coverages and grid layers can be used to value shade a surface. In either case, the data should be ordinal. The ARCPLOT draping routine seems to work better with grids than with polygons. See SFV.aml and Figure 9.1c.

SFV <surface> <value_lookup> {zfactor} {lattice|tin} {resolution} {hue} {intensity}

<surface>

a grid layer of a TIN

<value_lookup>

specifies HLS lightness (0 to 100) for a polygon coverage or a grid

{zfactor}

`Z' expansion factor--defaults to z-range / the larger of x-range and y-range

{lattice|tin}

the type of <surface>--defaults to lattice

{resolution}

the density of fishnet lines--defaults to the smaller of x-range and y-range / 25

{hue} {intensity}

define a color to be value shaded.