Referencing Data to Real Locations

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Presentation transcript:

Referencing Data to Real Locations

Objectives Explain what a map projection is List the major categories of map projections List spatial properties that may be distorted when different map projections are applied Change the map projection for a data frame and describe its effects

Map Projection Types Cylindrical Conical Planar

Cylindrical Projections

Conic Projections

Planar Projections

Understanding Distortion Distortion cannot be avoided; we have to choose from distortion of Shape Area Distance Direction

Preserving Properties If two properties are to be preserved then one is always direction These properties are incompatible:

Equatorial (normal) Aspect

Transverse Aspect

Oblique Aspect

Classifying Projections

Choosing a Map Projection Conformal (shape-preserving) maps Topographic and cadastral Navigation Civil engineering Weather

Choosing a Map Projection Area-preserving maps Population density Land use Quantitative attributes

Choosing a Map Projection Scale-preserving maps no map preserves true distance for all measurements Airline distances Distance from epicenter of an earthquake Cost calculations

Choosing a Map Projection

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