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# week7 - Week 7 GEOREFERENCING PROJECTIONS Part I PRESENTING...

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URP 4273: Survey of Planning Information Systems, UF - College of Design, Construction and Planning - URP Department GEOREFERENCING, PROJECTIONS Part I PRESENTING DATA Part II Week 7

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URP 4273: Survey of Planning Information Systems, UF - College of Design, Construction and Planning - URP Department topics of the week Georeferencing Coordinate systems Map Projections ArcMap and Projections
URP 4273: Survey of Planning Information Systems, UF - College of Design, Construction and Planning - URP Department Geo-referencing Geo-referencing is the process of establishing a relationship between the data displayed in your GIS software and its real-world location In simple terms, it is a process that adds geographic intelligence to the data Geo-referencing is accomplished by using: Coordinate systems – four components Ellipsoid Datum Projection Units

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URP 4273: Survey of Planning Information Systems, UF - College of Design, Construction and Planning - URP Department Coordinate systems Geographic coordinate system Parallels and Meridians form a graticular network Latitude and longitude are angles measured from Earth’s center to a point on the Earth’s surface Cartesian coordinate system Measures of length and angle are uniform X - Y + X + Y + X - Y - X + Y - X Y Data usually here
URP 4273: Survey of Planning Information Systems, UF - College of Design, Construction and Planning - URP Department Datums A datum is a mathematical representation of the shape of the Earth’s surface. A datum is defined by a spheroid, which approximates the shape of the Earth and the spheroid’s position relative to the center of the Earth. There are many spheroids that represent the shape of the Earth and many more datum s based on them. A horizontal datum provides a frame of reference for measuring locations on the surface of the Earth. A local datum aligns its spheroid to closely fit the Earth’s surface in a particular area, its origin point is located on the surface of the Earth.

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URP 4273: Survey of Planning Information Systems, UF - College of Design, Construction and Planning - URP Department Datums - continues
URP 4273: Survey of Planning Information Systems, UF - College of Design, Construction and Planning - URP Department Datums and referencing Two horizontal datums used almost exclusively in North America North American Datum of 1927 North American Datum of 1983 Locations on the earth are referenced to the datum Different datums have different coordinate values for the same location 13 th Street in Gainesville State Plane Florida North NAD27 State Plane Florida North NAD83

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Projections Projection is the process that transforms three-dimensional space onto a two-dimensional map.
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week7 - Week 7 GEOREFERENCING PROJECTIONS Part I PRESENTING...

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