FAQ: 什么时候需要定义投影,什么时候需要投影数据?

问题： 什么时候需要定义投影,什时候需要投影数据?

回答： 使用定义投影工具来定义数据的投影与数据定义投影.投影定义的选择必须与数据本身的投影坐标系相符.
例如,下面描述的坐标对是以不同的坐标系统显示USGS测量控制点.定义这些点投影时要与点本身的坐标系统匹配.

= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =

U.S.地质测量等级1的测量控制点

DESIGNATION - FAA L12 A

PID - EV9276

STATE/COUNTY- CA/SAN BERNARDINO

USGS QUAD - REDLANDS (1996)

X-坐标(经度) : Y-坐标 (纬度) : 坐标系统

-117.147115997222222222 : 34.0847576722222222222 : GCS_NAD_1983_HARN

6,819,912.12 : 1,854,322.74 : NAD 1983 State Plane CA_V, FIPS 0405, Feet

486,427.659 : 3,771,563.570 : NAD 1983 UTM Zone 11, Meters

= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =

如果数据的坐标系统与别的数据不匹配,使用Arctoolbox里的投影工具.这个工具可以在选择坐标系统时创建副本.

正如上面显示的例子,如果数据地理坐标系统,可以使用投影工具更改数据的投影为State Plane,UTM或其它坐标系统.

更多相关主题的信息请参阅编号为
23025,
29129的文章.




创建时间：2004-04-09
最近更新： 2011-12-12


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