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2	NATIONAL SPATIAL REFERENCE SYSTEM The National Spatial Reference System (NSRS) is a consistent national coordinate system that specifies latitude, longitude, height, scale, gravity, and orientation throughout the Nation, as well as how these values change with time.
3	NATIONAL SPATIAL REFERENCE SYSTEM
4	IMPROVING POSITIONAL ACCURACY
5	HIGH ACCURACY REFERENCE NETWORKS (HARN)
6	NAD 83 READJUSTMENT RESULTING REFERENCE FRAME IS CALLED NAD 83 (NSRS2007)
7	Continuously Operating Reference Stations
8	CORS ADVANTAGES
9	CORS DATA QUALITY
10	Common Question
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12	Common Question
13	Regional CORS Coverage
14	TWO TESTS FOR POSITIONING PRECISION
15	TEST DESIGN: DUAL FREQUENCY CARRIER PHASE
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17	Positioning error versus distance
18	Positioning Error vs. Duration of the Observing Session
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21	COMMENTS
22	TEST DESIGN: SINGLE-FREQUENCY CODE
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24	COMMENTS
25	SURVEYING METHODS
26	SURVEY PROJECTS