Investigate consistency of coord_acy_cd across all sites

[Kevin-M-Smith]

The coord_acy_cd describes the latitude and longitude coordinate accuracy at a given site.

---------------------------------
Code   Description
---------------------------------
H      Accurate to +/- .01 second (differentially corrected GPS)
1      Accurate to +/- .1 second (differentially corrected GPS)
5      Accurate to +/- .5 second (Precise Positioning Service (PLGR/PPS GPS))
S      Accurate to +/- 1 second
R      Accurate to +/- 3 seconds (Standard Positioning Service (SPS GPS))
F      Accurate to +/- 5 seconds
T      Accurate to +/- 10 seconds
M      Accurate to +/- 1 minute
U      Unknown

References

http://waterdata.usgs.gov/usa/nwis/uv?codes_help

[Kevin-M-Smith]

coord_acy_cd Frequency Distribution

postgres=# select distinct coord_acy_cd as coord_acy_cd, count(*) 
from active_sites group by coord_acy_cd order by count desc;

 coord_acy_cd | count 
--------------+-------
 S            |  6198
 F            |  1675
 U            |  1069
 1            |  1060
 5            |   827
 H            |   452
 M            |   448
 T            |   298
 R            |   150
 C            |    34
              |     7
 D            |     3
 E            |     3
 B            |     1
(14 rows)