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Cartography. Creating Maps. Cartographers must: select the objects to be shown evaluate their relative importance find some way to simplify their form. Cartographers are limited by: the purpose of the map its scale the methods to produce it the accuracy of the data. Map Purpose.

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Presentation Transcript
creating maps
Creating Maps

Cartographers must:

select the objects to be shown

evaluate their relative importance

find some way to simplify their form.

Cartographers are limited by:

the purpose of the map

its scale

the methods to produce it

the accuracy of the data.

map purpose
Map Purpose

Aesthetics vs. conformality or equivalence

Political considerations (size vs. importance)

Website to discuss maps, mapmaking or related topics such as GIS, remote sensing and photogrammetry: http://www.cartotalk.com/

scale
Scale

Large Scale

Small Scale

the size of a map s smallest discernable unit is its
The size of a map’s smallest discernable unit is its

Scale

Density

Region

Resolution

Projection

d) Resolution - generally large-scale maps have a great resolution.

mapping methods
Mapping Methods

Mapping cycling rides around Toronto 2004 to 2009 using GPS https://www.youtube.com/watch?v=iC56P-Ro4PY

TTC Weekday Movement http://vimeo.com/1865789

Ork Posters http://www.orkposters.com/toronto.html

aggregation
Aggregation

Presidential elections

by county and by state

Gore

Bush

2000 Election Results

McCain

Obama

2008 Election Results

Information to be mapped is shown in a summary form e.g. USA elections

types of maps
Types of Maps
  • Reference Maps

CIA World Factbook: https://www.cia.gov/library/publications/the-world-factbook/docs/refmaps.html

  • ChoroplethMaps (shading, colouring or placement of symbols)
  • Isoline Maps (uses lines)
  • Proportional Symbol Maps
  • Dot Maps
  • Mental Maps
choropleth maps
Choropleth Maps

http://www.statcan.gc.ca/pub/92f0138m/2008003/figures/5200001-eng.htm

isoline maps
Isoline Maps

http://mapmaker.rutgers.edu/355/Journey_to_Work.jpg

isobar
Isobar

http://www.earthlyissues.com/images/isobar.gif

Connect points of equal atmospheric pressure

proportional symbol map
Proportional Symbol Map

http://personal.frostburg.edu/kebachtel0/square%20map.jpg

slide16

AP exam Free Response Question based on a Cartogram:

Shown above is a special type of graphic used by geographers.

1. Identify the type of graphic by name.

2. What qualities does it have that qualify it as a graph?

3. What qualities would qualify it as a map?

sources
Sources

United Kingdom Department for communities and local government. http://www.neighbourhood.statistics.gov.uk/HTMLDocs/images/Statistical%20Maps%20-%20Best%20Practice%20v5_tcm97-51126.pdf