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Coordinate Reference System

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1. What is the difference between a coordinate reference system and a projection (transformation)? Why would you want to change your coordinate reference system during any analysis? Remember that a coordinate reference system is a special type (and thought of as a key component) of the broader concept of ‘spatial reference system’.
The difference between a coordinate reference system and a projection (transformation) are that a projection provides various mechanisms to project maps of the earth's spherical surface onto a two-dimensional Cartesian coordinate plane whereas a coordinate reference system enables geographic datasets to use common locations for integration. A coordinate system is a reference system used to represent the locations …show more content…

10. What do the values in the field A1_FMTXT appear to mean and what is their level of measurement? (see the pdf metadata file)
The values in the field A1_FMTXT provide a text summary of the type of land or environment and the material the cell is made up of. The scale of measurement is nominal.

11. Zoom in close on the shorelines to see how they are different. Compare the landscape makeup or conditions at four locations, two where land conditions in NLCD and SZLINETH are similar and two more where they differ. Use x,y coordinates to record the location and write a short description.
Where they differ:
Location 1: 124°3'22.398"W 46°57'36.813"N
SZLINETH states that this location is a flat sandy area whereas Washington_NLCD_erd_032200 recognizes it as a value of 51, representing shrubland or areas dominated by shrubs.
Location 2: 124°6'36.612"W 46°51'3.126"N
SZLINETH states that this location is a beach with relic ridges or a vegetated dune compared to Washington_NLCD_erd_032200, which recognizes it as a value of 42 which indicates evergreen forest and areas characterized by trees where 75% or more of the tree species maintain their leaves all

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