3.6 SURVEY CONTROL AND MARKERS--MAJOR CODE 150

Please note that proposals to either automate or discontinue the collection of Survey Control and Markers category DLGs are currently being evaluated.

The purpose of collecting Survey Control and Markers category data is to capture information about established horizontal and vertical positions which are used as fixed references in positioning and correlating map features. Elevation data of less than third order, such as spot elevations, or the "T" and "AT" spot elevations on provisional maps, are not collected in this category.

Because the survey control and markers depicted on the graphic cannot be revised from photographs, there is no photorevised feature code in this category.

None of the codes in this section applies to 1:100,000-scale maps.

3.6.1 General Principles

3.6.1.1 Node Attribute Codes

There are no node attribute codes.

3.6.1.2 Area Attribute Codes

There are no general principles that apply to area attribute codes.

3.6.1.3 Line Attribute Codes

There are no line attribute codes.

3.6.1.4 Single-Point Attribute Codes

The features in this category are generally digitized as single- point features, also called degenerate lines. Each single-point feature is assigned a code to describe the type of control point or marker and appropriate parameter codes to designate the location and elevation. Each single-point feature is also assigned the State and county FIPS codes.

3.6.1.5 General Purpose Attribute Codes

There are no general purpose attribute codes.

3.6.1.6 Descriptive Attribute Codes

There are no general principles that apply to descriptive attribute codes.

3.6.1.7 Parameter Attribute Codes

There are no general principles that apply to parameter attribute codes.

3.6.1.8 List of Survey Control and Markers Attribute Codes

o Node attribute codes

None

o Area attribute codes

000 0000 Outside area
150 0100 Void area

o Line attribute codes

150 0200 Closure Line - Code Deleted

o Single-point attribute codes

150 0300 Horizontal control station, third order or better, permanent mark
150 0301 Horizontal and vertical control station, third order or better
150 0302 Horizontal control station, vertical angle bench mark (VABM)
150 0303 Horizontal control station, checked spot elevation
150 0310 Vertical control station, third order or better, tablet
150 0311 Vertical control station, recoverable mark, third order or better, no tablet
150 0320 Boundary monument, third order or better, tablet
150 0321 Boundary monument, third order or better, no tablet
150 0330 Reference monument - Code deleted
150 0331 U.S. mineral or location monument - Code deleted
150 0332 Other control point - Code deleted

o General purpose attribute codes

None

o Descriptive attribute codes

150 0601 Decimal fraction of 0.1 feet or meters
150 0602 Decimal fraction of 0.2 feet or meters
150 0603 Decimal fraction of 0.3 feet or meters
150 0604 Decimal fraction of 0.4 feet or meters
150 0605 Decimal fraction of 0.5 feet or meters
150 0606 Decimal fraction of 0.6 feet or meters
150 0607 Decimal fraction of 0.7 feet or meters
150 0608 Decimal fraction of 0.8 feet or meters
150 0609 Decimal fraction of 0.9 feet or meters

o Parameter attribute codes

151 ---- State or State equivalent FIPS code
152 ---- County or county equivalent FIPS code
153 ---- Elevation, whole feet, 9999 or less
154 ---- Elevation, whole meters
155 ---- Elevation, whole feet below datum
156 ---- Elevation, whole feet greater than 9999
157 ---- Elevation, whole meters below datum
159 00-- Coincident feature - Code deleted

3.6.2 Node Attribute Codes

There are no attribute codes for nodes in this category.

3.6.3 Area Attribute Codes

        000 0000 Outside area

This code is described in section 3.0.6.1.

        150 0100 Void area

This code is used to identify the area beyond the national boundary to distinguish it from the background area. The line that defines the void area is unattributed.

3.6.4 Line Attribute Codes

        150 0200 Closure line

This code is no longer used.

3.6.5 Single-Point Attribute Codes

        150 0300 Horizontal control station, third order or better, permanent mark

This code identifies a degenerate line placed on a horizontal control station of third order or better with a permanent mark. It is shown by symbols 216(A), 512.99(C), or 2102.03(D).

        150 0301 Horizontal and vertical control station, third order or better

This code identifies a degenerate line placed on a horizontal control station of third order or better, having elevation data of third order or better and labeled BM (bench mark) as shown by symbols 217(A), 512.99(C), or 2102.03(D). See codes 153 ---- through 157 ---- for the appropriate elevation code.

        150 0302 Horizontal control station, vertical angle bench mark (VABM)

This code identifies a degenerate line placed on a horizontal control station, third order or better, with vertical angle elevation indicated by the label VABM as shown by symbols 218(A) or 2102.03(D). See codes 153 ---- through 157 ---- for the appropriate elevation code.

        150 0303 Horizontal control station, checked spot elevation

This code identifies a degenerate line placed on a horizontal control station, third order or better, with a checked spot elevation as shown by symbols 219(A), 512.99(C), or 2102.04(D). Do not code the elevation value in this category because it is coded in the Hypsography category.

        150 0310 Vertical control station, third order or better, tablet

This code identifies a degenerate line placed on a vertical control station with elevation data of third order or better and that is marked with a tablet as is shown by symbols 220(A), 512.100(C), or 2102.06(D). See codes 153 ---- through 157 ---- for the appropriate elevation code.

        150 0311 Vertical control station, recoverable mark, third order or better, no tablet

This code identifies a degenerate line placed on a vertical control station without a tablet but with a recoverable mark as shown by symbols 221(A), 512.100(C), or 2102.07(D). See codes 153 ---- through 157 ---- for the appropriate elevation code.

        150 0320 Boundary monument, third order or better, tablet

This code identifies a degenerate line placed on a boundary monument or land grant monument with elevation data of third order or better that has a tablet as shown by symbols 222, 501 (A) or 512.104, 523.11 (C). Although these symbols are digitized in the Boundaries or PLSS categories, they must also be digitized in this category to collect the elevation data. A monument number, if shown, is encoded in the Boundaries category. See codes 153 ---- through 157 ---- for the appropriate elevation code.

        150 0321 Boundary monument, third order or better, no tablet

This code identifies a degenerate line placed on a boundary monument or land grant monument with elevation data of third order or better but without a tablet as shown by symbols 223, 501 (A) or 512.104, 523.11 (C). Although these symbols are digitized in the Boundaries or PLSS categories, they must also be digitized in this category to collect elevation data. A monument number, if shown, is encoded in the Boundaries category. See codes 153 ---- through 157 ---- for the appropriate elevation code.

        150 0330 Reference monument

This feature is no longer collected in this category.

        150 0331 U.S. mineral or location monument

This feature is no longer collected in this category.

        150 0332 Other control point

This feature is no longer collected.

3.6.6 General Purpose Attribute Codes

There are no general purpose attribute codes in this category.

3.6.7 Descriptive Attribute Codes

150 060- Descriptive attribute codes 150 0601 through 150 0609 are used to represent decimal fractions of feet or meters. They are used only in conjunction with the elevation parameter attribute codes when the elevations are expressed to decimal fractions. It is not necessary to distinguish between feet and meters, because the unit of measurement is encoded in the associated parameter code. The specific decimal fraction values associated with each code are listed below.

        150 0601 Decimal fraction of 0.1 feet or meters

        150 0602 Decimal fraction of 0.2 feet or meters

        150 0603 Decimal fraction of 0.3 feet or meters

        150 0604 Decimal fraction of 0.4 feet or meters

        150 0605 Decimal fraction of 0.5 feet or meters

        150 0606 Decimal fraction of 0.6 feet or meters

        150 0607 Decimal fraction of 0.7 feet or meters

        150 0608 Decimal fraction of 0.8 feet or meters

        150 0609 Decimal fraction of 0.9 feet or meters

3.6.8 Parameter Attribute Codes

        151 00-- State or State equivalent FIPS code

Enter the two-digit FIPS code for the State in which the control point is located in the two spaces, flush right.

        152 0--- County or county equivalent FIPS code

Enter the three-digit FIPS code for the county in which the control point is located in the three spaces, flush right.

        153 ---- Elevation, whole feet, 9999 or less

Enter the elevation of a control point shown in feet (9999 or less) on the map in the four spaces, flush right. If a fractional part of a foot is shown, use the appropriate descriptive attribute to encode the value.

        154 ---- Elevation, whole meters

Enter the elevation of a control point shown in meters on the map in the four spaces, flush right. If a fractional part of a meter is shown, use the appropriate descriptive attribute to encode the value.

        155 ---- Elevation, whole feet below datum

Enter the elevation of a control point shown as a negative elevation in feet on the map in the four spaces, flush right.

        156 ---- Elevation, whole feet, greater than 9999

Enter the final four digits of the elevation of a control point shown in feet (greater than 9999) on the map in the four spaces, flush right. If a fractional part of a foot is shown, use the appropriate descriptive attribute to encode the value.

        157 ---- Elevation, whole meters below datum

Enter the elevation for a control point shown as a negative elevation in meters on the map in the four spaces, flush right. If a fractional part of a meter is shown, use the appropriate descriptive attribute to encode the value.

The following examples illustrate the application of the

elevation parameter attribute codes:

elevation 8,745 feet - encoded 153 8745

elevation 12,321 feet - encoded 156 2321

elevation 423 meters - encoded 154 0423

elevation 3,480.5 feet - encoded 153 3480, 150 0605

elevation -5 feet - encoded 155 0005

159 00-- Coincident feature

This code is no longer used.