United States Department of the Interior

BUREAU OF LAND MANAGEMENT

Arizona State Office

One North Central Avenue, Suite 800

Phoenix, Arizona 85004-4427

www.blm.gov/az/

In Reply Refer To:

9621 (9560)

EMS TRANSMISSION

Memorandum

To:	Branch of Cadastral Survey

From:	Gerald Davis

Chief Cadastral Surveyor (Acting)

Subject:	Point Naming Standards and Engineering Survey Descriptor Codes

The majority of the below information was issued in a memo from Stephen Malloy to the Unit One Team on April 17, 1996. I am now reissuing this information, with some updates and additions, as a reminder for us all. This will help in point naming confusion when technical reviews are made and will also standardize engineering survey codes for up and coming field to finish software. If a correction needs to be made, please contact me, so that the information can be disseminated to the entire Branch.

Point Naming Standards

Traverse Points	Begin with 1 and number sequentially up to 1,000.

Topo Shots	Begin with 1,001 and number sequentially.

Angle Points	Begin with AP1, AP1T if it’s a temp., sequentially numbering in a counter clockwise direction. Starting point is job dependent.

Mineral Claim Corners	Use Initials of the claim, combined with corner number and a letter designator. Example: Claim names are Blackjack 1 and 2. We find corner 3 of Blackjack 1. Its name would be 1B3F. Similarly, we set a temp. for corner 4 of Blackjack2; its name is 2B4T. The East End Center of Blackjack 2 is 2BEECT or 2BEECTF.

Misc. Monuments	Begin with M1 and number sequentially.

100100	PLSS Brass Cap that will not be remonumented. If a new date or Township and Range is added, it still remains without a letter designator suffix.

100100F	Found stone, or original evidence that will be remonumented. Additional points will be named in the same style and numbered consecutively.

100100	When a found position is monumented, it does NOT get a letter designator.

100100T	A temp.

100100L	Use for local evidence. Additional points will be named in the same style and numbered consecutively.

C100100	Any calculated position.

G100100	GCDB: Begin with G (preceding appropriate GCDB point number).

100100B1	A bearing tree in the NE quadrant, 2-4 follow respectively.

100100WC	A witness corner.

100100R1	A reference monument in the NE quadrant, 2-4 follow respectively.

100100X1	A bearing object in the NE quadrant, 2-4 follow respectively.

In addition to these guidelines, please remove all extraneous data (search points, local corners not returned, etc.) from CMM files.

AZ-956 Engineering Survey Descriptor Codes

This document contains a list of standard survey key codes for AZ-956 to be used on all engineering survey projects. Codes are listed by type and then by object. With all codes, additional data can be entered with the code as either an attribute or as a description. In the Code List, the Data Format Column shows which codes have attributes, such as a diameter for a pipe.

This list is not all inclusive, if there is an object that is needed that is not on this list, note the object and code used in your survey notes and notify the Field Chief so the list can be updated.

Using the Codes

Each point should begin with a Code from the list, followed by the Linework Code, if applicable, any attributes, and then any additional description. If a second code applies to the point, add it to the end of the description. Use spaces to separate each Code, Linework Code, Attribute or Description.

Attributes are used for specific Codes such as pipes, trees, culverts and signs, where it is typical to get a measurement or description with the Code. These should follow the Code or Linework Code, separated by a space. Codes that have Attributes are shown under Data Format.

Descriptions are any additional information that you want to include for a point that isn’t an Attribute. These should follow the Code, Linework Code or Attribute and begin with a ‘/’. If a second code is used for the point, end the Description with a ‘/’ also.

Some examples:

BRK (point on Breakline)

CMP 24 (24” diam. Corrugated Metal Pipe)

TR 0817O (8”DBH OAK, 17’Radius dripline)

RE B /HWY 22/ CLF 8 – (Begin Road Edge for Highway 22, and 8’ Chain Link Fence)

No Elevation Points

All points that are not intended to be used for creating contour lines should have the Descriptor “NOEL” added.

Linework Codes

For linear features, such as breaklines, road edges, centerlines, fences, etc., use Linework Codes to show which codes belong to the same line. These codes will allow for lines to be auto-generated in Civil 3D.

There are several different Linework Codes that can be used and will be listed at the end of this document and in the Civil 3D documentation, but the two codes used most often are B (begin line) and E (end line).

Linework is processed by Point Number, so, where possible, try and collect points in one direction. To begin a line, on the first point collected on the line use a B after the code (ex: BRK B). If there are multiple lines of the same type, use an E on the last point of the initial line, and a B at the first point of the next line.

If you are creating linework for multiple lines of the same type at the same time, such as both edges of a road, you can use a number after the code to mark which side it belongs to, such as RE1 for the right edge and RE2 for the left.

The following example shows a case where two road edges and a breakline were collected by working one direction along the road. The resulting linework would create lines BRK, RE1 and RE2.

Pt # Desc Pt # Desc 1001 BRK B 1006 RE1 1002 RE1 B 1007 BRK 1003 RE2 B 1008 RE1 E 1004 RE2 1009 RE2 1005 RE1 1010 RE2 E The Close Line code (C) would be used to end the linework at the beginning point. Such as a square concrete pad. In this instance you would use the following code sequence to create a closed “square” figure instead of an open “C” shape: CC B, CC, CC, CC C. To create a 3 point circular curve you would use the Begin Curve (BC) and End Curve (EC) codes. To code a Road Edge for example: RE B, RE, RE BC, RE, RE EC, RE E. The shot taken between the BC and EC should be as close to the approximate mid-curve as possible to avoid skewing the curve radius. The same attention needs to be paid to the location of BCs and ECs. Linework Codes: B – Begin Line BC – Begin Curve E – End Line EC – End Curve C – Close Line
All Control Markers	Code	Data format
Aluminum Disk	AD	AD
Benchmark	BM	BM (name)
Lath	LTH	LTH
Nail	NAIL	NAIL
Rebar	RB	RB
Rebar, with cap	RBC	RBC
Right-of-way	ROW	ROW
Features	Code	Data format
Fence, Chain link	CLF	CLF (height FT)
Fence, Wire	WIF	WIF (height FT)
Fence, Wood	WDF	WDF (height FT)
Fence Corner	FNC	FNC (type) (num1) (num2)
Gate	GT	GT
Handrail	HR	HR
Post	PS	PS (diameter IN)
Sign	SG	SG
Vault	VLT	VLT
Hydro	Code	Data format
Flowline	FL	FL
Ground shot, water	GSW	GSW
High water mark	HWM	HWM
Water edge	WE	WE
Well	WELL	WELL
Water surface	WS	WS
Structures	Code	Data format
Building, corner	BLDC	BLDC
Building, face	BLDF	BLDF
Concrete	CC	CC
Concrete, Top	TOC	TOP CONC
Concrete, Edge	ECC	ECC
Culvert	CLV	CLV (diameter IN)
Pipe Invert	INV	INV (diameter IN)
Pipe, Corrugated Metal	CMP	CMP (diameter IN)
Pipe, Corrugated, Plastic	CPP	CPP (diameter IN)
Pipe, Top	PT	PT (diameter IN)
Wall	WALL	WALL (height FT)
Transportation	Code	Data format
Back of curb, top	TBC	TBC
Bridge	BRDG	BRDG
Centerline	CL	CL
Face of curb, top	TFC	TFC
Face of curb, bottom	BFC	BFC
Guard rail	GR	GR
Pavement, edge	EP	EP
Road, edge	RE	RE
Topography	Code	Data format
Asphalt	AC	AC
Breakline	BRK	BRK
Ground shot	GS	GS
Riprap	RP	RP
Toe of Slope	TOE	TOE
Top of Slope	TOP	TOP
Utilities	Code	Data format
Anchor, guy wire	GWA	GW
Drain Inlet	DI	DI
Electric line, buried	ELB	ELB
Electric line, overhead	ELO	ELO
Electrical panel	ELP	ELP (height IN) (width IN) (depth IN)
Fire hydrant	FH	FH
Gas	GAS	GAS (diameter IN)
Gas meter	GM	GM
Gas valve	GV	GV
Manhole, Drain	DMH	DMH (diameter IN)
Manhole, Sewer	SMH	SMH (diameter IN)
Overhead utility	OHU	OHU
Pole, guy	GP	GP
Pole, light	LP	LP
Pole, power	PP	PP
Pole, utility	UP	UP
Sewer	SWR	SWR (diameter IN)
Telephone line, buried	TLB	TLB
Telephone line, overhead	TLO	TLO
Transformer	TRN	TRN
Water	WTR	WTR
Water line, buried	WLB	WLB
Water meter	WM	WM
Water valve	WV	WV
Vegetation	Code	Data format
Brush line	BL	BL
Dripline	DRIP	DRIP
Shrub	SH	SH
Stump	STP	STP (diameter IN) (height FT)
Tree	TR	TR (trk diam IN)(dripline rad. FT) (type) TR 08 12 F = 8” FIR with 12’ dripline D=Deciduous E=Evergreen F=Fir O=Oak P=Pine R=Redwood
Tree, two trunks	TRD	TRD (trk diam IN)(dripline rad. FT) (type)
Tree, three trunks	TRT	TRT (trk diam IN)(dripline rad. FT) (type)
Tree, cluster	TRC	TRC (trk diam IN)(dripline rad. FT) (type)
Vegetation	VEG	VEG
Miscellaneous	Code	Data format
Miscellaneous	X	X