Thematic Mapping ArcView_module_3 May 12, 1:30 PM

Outline Getting a data into ArcView Choosing a Legend Choosing a Symbol

ArcView Shapefiles File extension Functions.shpthe feature geometry.shxan index to the feature geometry.dbfthe associated dBASE file of attribute information Shapefiles come in the following three files Getting a data into ArcView

How to add a Theme Click the Add Theme button Feature data will be displayed by default Getting a data into ArcView

The Table of Contents Getting a data into ArcView

The Table of Contents shows … Getting a data into ArcView The name of each theme in the view The feature type of each theme The legend for each theme Whether a theme is on or off The order the themes are drawn in Which themes are active Which theme is editable

Steps for making thematic map 1. Choose a theme 2. Choose a Legend 3. Choose a Symbol

How to open Legend Editor Choosing a Legend Double-click a theme in the Table of Contents to open the Legend Editor Legend Types

Single Symbol displayed with the same colors and symbols. useful when you only need to show where a theme ’ s features are located. Choosing a Legend – legend type

Graduated Color displayed with the same symbol type, but different colors shade (e.g., dark blue to light blue) or tone (e.g., warm tone, cold tone) represents the progression of values for a data attribute Choosing a Legend – legend type

Graduated Symbol symbolize data that expresses size or magnitude. only available for point and line data. Choosing a Legend – legend type

Unique Value each unique value in a theme is represented with a unique symbol effective for displaying categorical data. Choosing a Legend – legend type

Dot Density displayed with a number of dots corresponding to a value only available for polygon data Choosing a Legend – legend type

Chart displayed with a chart the components of the chart correspond to data attributes you specify the size of each part in a chart is determined by the value of each data attribute good for displaying the values of many attributes Choosing a Legend – legend type

Choosing an Appropriate Legend depends on characteristics of the attributes of interest (e.g. categorical vs numeric) (e.g. normalized or not) feature type of the theme (e.g. point, line, polygon) Choosing a Legend

Choosing an Appropriate Legend Is your data categorical, like names of places or types of roads? Use Unique Value Is your data ranked, like best sales territory to worst sales territory? Use Graduated Symbol for point/line feature Use Graduated Color for polygon feature Choosing a Legend

Choosing an Appropriate Legend Is your data raw count, like population or barrels of crude oil? Use Dot Density for polygon feature Use Graduated Symbols for point/line feature Is your data normalized, like percentage data or population per unit of area? Use Graduated Color for polygon feature Use Graduated Symbol for point/line feature Use Chart for several normalized attributes Choosing a Legend

Steps for making thematic map 1. Choose a theme 2. Choose a Legend 3. Choose a Symbol Choosing a Symbol

How to open Symbol Window Choosing a Symbol Double-click here to open the Symbol Window Color Palette: choose a color for all feature types and text Palette Manager: customize palettes Symbol Palettes

Fill Palette: choose how to fill the polygon (e.g., color-filled, empty, pattern-filled). Pen Palette: choose the pattern for the line (e.g., solid, dashed, double). Marker Palette: choose the marker suitable for the point theme (e.g., basic shapes Font Palette: select a font to draw the label Choosing a Symbol

Color Palette Unlike the Symbol Palette, the Color Palette applies to all feature types and text. Choosing a Symbol Point, Line Polygon Text

Auto-labeling  choose a text symbol/color from font palette/color palette  choose a theme  choose the Auto-label … from the Theme menu  choose a field to be used for labeling  choose a labeling option Choosing a Symbol

Auto-labeling Choosing a Symbol Unchecked not to display overlapping labels Checked to make labels dependent on a map scale Checked not to display duplicate labels

Map Tips use color/shape to represent qualitative attributes (i.e. type) [unique value] use shade/size to represent quantitative attributes (i.e. magnitude) [graduated color/graduated symbol] normalize attributes for choropleth map due to the effect of variant area size [graduated color map with normalization] Choosing a Symbol

How to load additional markers select ESRI font (e.g., ESRI cartography) from the font palette, and then click “ Create Marker ” button at the bottom. Choosing a Symbol

How to make a transparent polygon symbol set Background to nothing while Foreground is set to pattern-filled. Choosing a Symbol