Regulations of Connecticut State Agencies
(a) All surveys prepared in metric format shall use: 1 meter = 3.28083333 U.S. Survey feet.
(b) Horizontal Accuracy
Each survey depicting horizontal locations shall conform to a Horizontal Accuracy Class the tolerance of which is defined as follows:
|
Class |
Positional |
Linear |
Angular |
||
|---|---|---|---|---|---|
|
Feet |
Meters |
(Use the ratio for D>...) |
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|
AA |
1:15,000 |
±0.01' |
±.003m |
(1:22,500 @D>225'(69m)) |
±8" |
|
A-1 |
1:10,000 |
±0.01' |
±.003m |
(1:15,000 @D>150'(46m)) |
±10" |
|
A-2 |
1:5,000 |
±0.02' |
±.006m |
(1:7,500 @D>150'(46m)) |
±20" |
|
B |
1:1,000 |
±0.5' |
±.15m |
(1:1,500 @D>750'(229m)) |
±2' |
|
C |
±2' |
±2' |
±.6m |
±30' |
|
|
D |
compilation of existing data-NOT A FIELD SURVEY |
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Linear accuracies expressed as "±"apply to distances less than (<) those prescribed as a ratio.
(c) Vertical Accuracy
Each survey depicting vertical location shall conform to a Vertical Accuracy Class the tolerance of which is defined as follows:
|
Level Loop Closure Greater Than One Mile |
Level Loop Closure Less Than One Mile |
||||
|---|---|---|---|---|---|
|
Class |
Feet |
Meters |
Feet |
Meters |
|
|
V-1 |
±.02√M |
±.005√K |
±.006√N |
±.002√N |
|
|
V-2 |
±.035√M |
±.008√K |
±.010√N |
±.003√N |
|
|
V-3 |
±.05√M |
±.012√K |
±.020√N |
±.006√N |
|
|
M or K = The lengthof the level loop in miles/kilometers |
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|
N = The number ofinstrument setups in the level loop |
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(d) Topographic Survey Accuracy
Each Topographic Survey shall conform to a Topographic Accuracy Class the tolerance of which is defined as follows:
|
Class |
Horizontal Position |
Contour Interval Test |
|
|---|---|---|---|
|
Feet |
Meters |
||
|
T-1 |
1/40of map scale |
1/1500of map scale |
90% within ½ contour interval |
|
T-2 |
1/40 of map scale |
1/1500 of map scale |
80% within ½ contour interval |
|
T-3 This class of topographic map applies to photogrammetric maps for which the surveyor provides the horizontal and vertical control. Refer to the “National Map Standards for Photogrammetric Mapping” for requirements. |
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|
T-D This class of map standard applies to a topographic map compiled from various sources of information not necessarily verified by the surveyor. |
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In using Topographic Accuracy Class T-1 or T-2, the surveyor is expressing confidence that should a test profile be run in the field, a plotted comparison with a profile scaled from the map shall be in agreement within the above criteria and the remainder shall be within the contour interval.
(Adopted effective June 21, 1996)