GIS Presentation and Output --charts --maps. Presentation: Charts charts can be used to display tabular data. the types of charts available in ArcView.

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Presentation transcript:

GIS Presentation and Output --charts --maps

Presentation: Charts charts can be used to display tabular data. the types of charts available in ArcView are typical of these available in GIS desktop systems most systems have dynamic (as opposed to static) charting: charts automtically updated as data in underlying tables changes: 6 types in ArcView: area, bar, column, line, pie, scatter Area Bar Column Line Pie Scatter

Presentation: Maps What’s a map? "a representation, normally to scale and on a flat medium, of a selection of material or abstract features on, or in relation to, the surface of the earth.” International Cartographic Association A spatial model of the real world, but differentiated from it by: abstraction, focus, simplification, symbolization scale, projection, and purpose

What’s in a Map? Abstraction – Imaginary features (i.e. political boundaries) as well as physical features – Past, present, and future (archaeological sites, current, and planned roads) features Focus – Selection and classification of features in real world to include in the map Simplification –Simplification of complex features such as coastlines –Exaggeration of features that are too small to show at the scale of the map Symbolization –Use of symbols or graphic to represent classified objects (e.g. church) Scale –The ratio of distance on a map, to the equivalent distance on the earth's surface. Projection – Representing curved surface of the earth on a flat plane. Distortion is inevitable. Purpose –To describe, measure, communicate/persuade

Types of Maps 1. Planimetric (e.g municipal base map) A map designed to portray the horizontal positions of features; vertical information is specifically ignored. 2. Topographic (e.g. USGS 7.5 minute quads) A map designed to portray features on the surface of the Earth, including relief (elevation), hydrography, and cultural features. 3. Cadastral (e.g municipal parcel map) A map representing boundaries of land parcels, ownership, land use, valuation, and other related information. 4. Image (e.g LANDSAT image ‘map’) A map representing a remotely sensed picture or reflection of all or part of the Earth's surface –may or may not be orthomorphically correct. 5. Thematic (see next slide for types and examples) –A map used to visualize spatial relationships and patterns among information pertaining to some theme or concept (e.g. income)

Types of Thematic Maps Thematic Map: A map used to visualize spatial relationships and patterns among information pertaining to some theme or concept (e.g. income) »Choropleth map: uses zones or polygons to display information using shading, dot, density, or other techniques. –e.g population change, ethnicity distribution »Proximal (dasymetric) map: shows zones of constant attributes, such as soil type or vegetation (similar to choropleth except that data determines boundary lines; no pre-defined polygons) –e.g zoning, soil map »Isopleth map (contour or isarithmic) : shows a contiuous three dimensional surface such as elevation using lines connecting points of equal value (contours). –e.g elevation, travel time contours from a point(s), land values, income »Point (dot) or symbol map: shows information relating to specific points using marker sysmbols whose size and/or frequency relates to magnitude of phenomena –housing sales, code violations, crimes

Making Better Maps: some general principles keep it simple, but don’t rely on software defaults show only the area under study (e.g. if Texas, don’t show AK or LA counties): use small insert map to show relative location put title at top using ‘thick line’ font: serif/sans-serif and case not critical map labels – best in serif font (letters have ‘tails’), with first letter upper and rest lower case –place above and to the right of the feature (2nd choice: above to left) –use font size hierarchy to indicate relative importance: US, Texas, Dallas –water features traditionally labelled in italic font for legends/choice of shading – patterns should have natural visual progression corresponding to data values; –shades of same color better than multi-colored –can highlight top and bottom with contrasting color –be sure legend is big enough to show different patterns

Making Better Maps: some general principles (cont’d.) to create more varied styles/colors for lines or polygon shading, place a copy of a theme on top of itself allow for size reduction (e.g for journal publication), –point symbols visually reduce at twice the rate of line features (a function of area) for dot patterns, keep density constant and change size of dots (rather than converse): but most software won’t do this! color or dot screen or stipple oceans and large water bodies import to graphics design package for major customization.