Standard for Digital Terrain Data Capture
in British Columbia

Table of contents

Table 2-1 - Description of Terrain Mapping Project Data

Item #

Terrain Data Form Field Name

Coding Instructions

Field Length

Field Descrip

CSV Attribute Name

Note: The first 14 items refer to the metadata in the header of the Terrain Polygon Data Form.

1

Project Name

The common name of the project, usually a well known local place or feature. See Table 2-2.

40

c-e-l

Proj_Name

2

Geographic Location

The geographic area of the mapping project.

See Table 2-2.

40

an-e-l

Geog_Loc

3

Consultant/ Department

The government department or private sector company that is responsible for the current terrain mapping project. See Table 2-2.

40

c-e-l

Org_Name

4

Mapper Name

The geologist or geomorphologist who is doing the mapping. Where there is more than one mapper working on a project, the name of the project leader. See Table 2-2.

30

c-e-l

Mapper

5

Legend Type(s)

The type of legend associated with the map; refer to the Terrain Mapping Methodology (RIC) for legend format and specifications. Indicate one of the following with an `x': General, Short, Terrain stability, Other/Custom.

See Legend Type Code Table, Table 2-2.

3

c-x

Leg_Type

6

Legend Source

The origin of a customized legend. See Table 2-2.

50

c-e-l

Leg_Src

7

Map Scale

The scale on which the original terrain polygons were captured. See Table 2-2.

8

n-e-r

Scale

8

Terrain Survey Intensity Level

The extent to which the terrain mapping for the current project has been checked on the ground. See Table 2-3.

1

a-x-u

Tsil

9

Date Surveyed

The date on which the terrain mapping for the project was completed. Format: dd-mmm-yy. See Table 2-2.

9

c-x-r

Surv_Date

10

Date Recorded

The date on which of the project and polygon mapping was completed and entered into a Database. Format: dd-mmm-yy.

9

c-x-r

Rec_Date

11

Recorder Name

The person who originally entered the terrain map data electronically.

30

c-e-l

Rec_Name

12

Slope Units

The type of units, if slope classes were done for this database, percent or degrees denoting slope steepness. The same units must be used for all slope steepness values in a given project. Indicate one of the following with a (P) Percent, (D) Degrees or (N) Null.

See Table 2-2 and See Table 2-17.

1

c-x-l

Slp_Unit

13

Stability. Classification Type

The classification system used to classify slope stability for the current project. Indicate only one of the following with an (R) Recon, (D) Detailed, or (E) Es.

See Tables 2-18 - 2-20.

1

c-x-l

Stbcls_Tp

14

Comments

This field may be used to record any pertinent information regarding the project. At all times attempt to use referenced classifications which are well defined and understood in the science, or provide thorough definitions for the user. This project specific data will be stored in flat file format, unless keyword or standard designations are required, then contact the data custodian. The data custodian will keep records of new or additional classifications, which are commonly used for project specific applications.

300

c-e-l

Comments

Note: Items 15 through 105 refer to the attributes on the Terrain Polygon Data Form.

15

Polygon Number

An identifier each polygon being mapped. Polygons may be numbered within projects or within projects and mapsheets, depending on the preference of the lead mapper.

8

n-e-r

Poly_Nbr

16

Project Identification

A unique identifier for each project being delivered within a single contract. If only one project is being delivered, no project identifier is required. This variable allows any mapping metadata (TSIL for example) to be specified for the project as a whole. See section 4 and Table 2-2.

5

an-x-l

Proj_ID

17

Mapsheet Number

Where the project mapping falls entirely within a single mapsheet, the number of the mapsheet. See Table 1-1.

9

an-x-l

Mapsh_

Nbr

18

Decile of Terrain Component 1

Describes the proportion of the polygon covered by Component 1, in deciles.

Note: The deciles of Components 1-3 must total 10 (i.e., 5-3-2 or 6-4, if the first two deciles total 10 then the third decile is not filled out). Decile 1 must be greater or equal to decile 2, which must be greater or equal to decile 3. No decile = 100% (1st component only). See Table 2-14.

2

n-x-r

Tdec_1

19

Partial Cover Flag of Component 1

A single slash `/' indicates that the overlying material in the terrain component only partially covers the underlying material. It means a moderately extensive but discontinous cover of surface material. Eolian veneer is an example.

Note this is a new term added to the Terrain Classification Manual, Howes and Kenk, Version 2.0

1

c-x-l

Prtflg_1

20

Surficial Material Texture of Component 1

The standard terrain texture at the surface. The size, shape and sorting of particles in clastic sediments (or the proportion and degree of decomposition of plant fibre in organic sediments) in the first stratum of the terrain component 1 in the current terrain polygon.

Indicated by 1-3 lowercase letters. The dominant (1), secondary (2), and tertiary (3) standard textures found in a stratigraphic unit are entered as 3, 2, 1 (see the Terrain Classification Manual, Howes and Kenk, Version 2.0). If only one or two textures are given, the remaining spaces are left blank. See Table 2-5.

3

c-x-r-l

Ttex_1

21

Surficial Material of Component 1

The formative geomorphological process of the first stratum of surficial material of component 1 of the current terrain polygon. See Table 2-6.

2

c-x-l-u

Surfm_1

22

Surficial Material Qualifier of Component 1

A code used to specify whether the formative geomorphological process of the first stratum of surficial deposit of component 1 is currently `active' (`A') or `inactive' (`I'). The assumed status is not recorded.

Note: `G' is now coded directly with the genetic material (see previous item). See Table 2-7.

1

c-x-l-u

Surfm_Q1

23

Surficial Material Subtype of Component 1

A project-specific code for the subtype of the surficial material in the first stratum of the component of the current terrain polygon. A surficial material subtype is distinguished by characteristics that cannot be adequately represented by standard terrain classes. See Table 2-29.

1

n-x-r

Surfm_St1

24

Surface Expression of Component 1

A series of 1-3 lowercase letter codes used in combination to describe the three-dimensional shape of the upper surface and the thickness of the first stratum in the component of the current terrain polygon. The first code is the most dominant surface expression. See Table 2-8.

3

c-x-l-l

Surf_E1

25

Bedrock Type of Component 1

The type of bedrock in the terrain component. (This is only applicable where surficial material is of origin type `R'). See Table 2-4.

These bedrock classes are new to the Terrain Classification System. The intent of using the bedrock code is to provide auxiliary information, as to help qualify texture and/or terrain stability information. It is not intended to provide bedrock stratigraphy.

2

c-x-l-l

Bedrock_1

26

Subsurficial Material Texture of Component 1

The standard terrain texture at the first subsurface stratum. The size, shape and sorting of particles in clastic sediments (or the proportion and degree of decomposition of plant fibre in organic sediments) in the first stratum of the terrain component 1 in the current terrain polygon.

Indicated by 1-3 lowercase letters. The dominant (1), secondary (2), and tertiary (3) standard textures found in a stratigraphic unit are entered as 3, 2, 1 (see the Terrain Classification Manual, Howes and Kenk, Version 2.0). If only one or two textures are given, the remaining spaces are left blank. See Table 2-5.

3

c-x-r-l

Sttex_1

27

Subsurficial Material of Component 1

A code representing the formative geomorphological process of the first subsurface stratum of surficial material of the first component of the current terrain polygon.

Note: There is now provision for the coding of two subsurface materials, for each component in this database. It is expected however that the bulk of the (RIC) mapping will only use two strata. For the mapping of deep stratigraphy the user will have to modify and/or create a custom database. See Table 2-6.

2

c-x-l-u

Ssurfm_1

28

Subsurficial Material Qualifier of Component 1

A code used to specify whether the formative geomorphological process of the subsurficial stratum of surficial deposit of component 1 is currently `active' (`A') or `inactive' (`I'). The assumed status is not recorded.

Note: `G' is now coded directly with the genetic material (see previous item). See Table 2-7.

1

c-x-l-u

Ssurfm_Q1

29

Subsurficial Material Subtype of Component 1

A project-specific code that indicates a subclass of the genetic material in the second stratum of component 1 of the current terrain polygon. A surficial material subclass is distinguished by characteristics that cannot be adequately represented by the standard surface material origin classes. See Table 2-29.

1

n-x-l

Ssurfm_

St1

30

Subsurface Expression of Component 1

A series of 1-3 lowercase letter codes used in combination to describe the three-dimensional shape of the upper surface and the thickness of the second stratum in component 1 of the current terrain polygon. The first code is the most dominant surface expression. See Table 2-8.

3

c-x-l-l

Ssurf_E1

31

Sub-Subsurficial Material Texture of Component 1

The standard terrain texture at the Sub-subsurface. The size, shape and sorting of particles in clastic sediments (or the proportion and degree of decomposition of plant fibre in organic sediments) in the third stratum of the terrain component 1 in the current terrain polygon.

Indicated by 1-3 lowercase letters. The dominant (1), secondary (2), and tertiary (3) standard textures found in a stratigraphic unit are entered as 3, 2, 1 (see the Terrain Classification Manual, Howes and Kenk, Version 2.0). If only one or two textures are given, the remaining spaces are left blank. See Table 2-5.

3

c-x-r-l

Tttex_1

32

Sub-Subsurficial Material of Component 1

The formative geomorphological process of the Sub-substratum of surficial material of component 1 of the current terrain polygon. See Table 2-6.

2

c-x-l-u

Tsurfm_1

33

Sub-Subsurficial Material Qualifier of Component 1

A code used to specify whether the formative geomorphological process of the first stratum of surficial deposit of component 1 is currently `active' (`A') or `inactive' (`I'). The assumed status is not recorded.

Note: `G' is now coded directly with the genetic material (see previous item). See Table 2-7.

1

c-x-l-u

Tsurfm_

Q1

34

Sub-Subsurficial Material Subtype of Component 1

A project-specific code for the subtype of the surficial material in the Sub-substratum of the component of the current terrain polygon. A surficial material subtype is distinguished by characteristics that cannot be adequately represented by standard terrain classes. See Table 2-29.

1

n-x-r

Tsurfm_

St1

35

Sub-Subsurface Expression of Component 1

A series of 1-3 lowercase letter codes used in combination to describe the three-dimensional shape of the upper surface and the thickness of the Sub-substratum in the component of the current terrain polygon. The first code is the most dominant surface expression. See Table 2-8.

3

c-x-l-l

Tsurf_E1

36

Relation of Component 1 and 2

A general indicator of the relative areal proportions of the first and second components within the current terrain polygon. (Note - These proportional indicators are frequently used in place of percentiles. Bioterrain mapping however usually specifies the use of percentiles). See Table 2-14.

2

c-x-l

Comrel1_2

37

Decile of Terrain Component 2

Describes the proportion of the polygon covered by Component 2, in deciles.

Note: The deciles of Components 1-3 must total 10 (i.e., 5-3-2 or 6-4, if the first two decile total 10 then the third decile is not filled out). Decile 1 must be greater or equal to decile 2, which must be greater or equal to decile 3. The dominant component of surficial material(s) in a terrain polygon; designated by a decile, (8 means 80%; no entry means 100%) See Table 2-14.

2

n-x-r

Tdec_2

38

Partial Cover Flag of Component 2

A single slash `/' indicates that the overlying material in the terrain component only partially covers the underlying material. Eolian veneer is an example.

Note this is a new term added to the Terrain Classification Manual, Howes and Kenk, Version 2.0.

1

c-x-l

Prtflg_2

39

Surficial Material Texture of Component 2

The standard terrain texture at the surface. The size, shape and sorting of particles in clastic sediments (or the proportion and degree of decomposition of plant fibre in organic sediments) in the first stratum of the terrain component 2 in the current terrain polygon.

Indicated by 1-3 lowercase letters. The dominant (1), secondary (2), and tertiary (3) standard textures found in a stratigraphic unit are entered as 3, 2, 1 (see the Terrain Classification Manual, Howes and Kenk, Version 2.0). If only one or two textures are given, the remaining spaces are left blank. See Table 2-5.

3

c-x-r-l

Ttex_2

40

Surficial Material of Component 2

The formative geomorphological process of the first stratum of surficial material of component 2 of the current terrain polygon. See Table 2-6.

2

c-x-l-u

Surfm_2

41

Surficial Material Qualifier of Component 2

A code used to specify whether the formative geomorphological process of the first stratum of surficial deposit of component 2 is currently `active' (`A') or `inactive' (`I'). The assumed status is not recorded.

Note: `G' is now coded directly with the genetic material (see previous item). See Table 2-7.

1

c-x-l-u

Surfm_Q2

42

Surficial Material Subtype of Component 2

A project-specific code for the subtype of the surficial material in the first stratum of component 2 of the current terrain polygon. A surficial material subtype is distinguished by characteristics that cannot be adequately represented by standard terrain classes. See Table 2-29.

1

n-x-r

Surfm_St2

43

Surface Expression of Component 2

A series of 1-3 lowercase letter codes used in combination to describe the three-dimensional shape of the upper surface and the thickness of the first stratum in the component of the current terrain polygon. The first code is the most dominant surface expression. See Table 2-8.

3

c-x-l-l

Surf_E2

44

Bedrock Type of Component 2

The type of bedrock in the terrain component. (This is only applicable where surficial material is of origin type `R'). See Table 2-4.

These bedrock classes are new to the Terrain Classification System. The intent of using the bedrock code is to provide auxiliary information, as to help qualify texture and/or terrain stability information. It is not intended to provide bedrock stratigraphy.

2

c-x-l-l

Bedrock_2

45

Subsurficial Material Texture of Component 2

The standard terrain texture at the first subsurface stratum. The size, shape and sorting of particles in clastic sediments (or the proportion and degree of decomposition of plant fibre in organic sediments) in the first stratum of terrain component 2 in the current terrain polygon.

Indicated by 1-3 lowercase letters. The dominant (1), secondary (2), and tertiary (3) standard textures found in a stratigraphic unit are entered as 3, 2, 1 (see the Terrain Classification Manual, Howes and Kenk, Version 2.0). If only one or two textures are given, the remaining spaces are left blank. See Table 2-5.

3

c-x-r-l

Sttex_2

46

Subsurficial Material of Component 2

A code representing the formative geomorphological process of the first subsurface stratum of surficial material of component 2 of the current terrain polygon.

Note: There is only provision for the coding of one subsurface material, for each component in this database. For the mapping of stratigraphy the user will have to modify and/or create a custom database. See Table 2-6.

2

c-x-l-u

Ssurfm_2

47

Subsurficial Material Qualifier of Component 2

A code used to specify whether the formative geomorphological process of the subsurficial stratum of surficial deposit of component 2 is currently `active' (`A') or `inactive' (`I'). The assumed status is not recorded.

Note: `G' is now coded directly with the genetic material (see previous item). See Table 2-7.

1

c-x-l-u

Ssurfm_Q2

48

Subsurficial Material Subtype of Component 2

A project-specific code that indicates a subclass of the genetic material in the second stratum of component 2 of the current terrain polygon. A surficial material subclass is distinguished by characteristics that cannot be adequately represented by the standard surface material origin classes. See Table 2-29.

1

n-x-r

Ssurfm_

St2

49

Subsurface Expression of Component 2

A series of 1-3 lowercase letter codes used in combination to describe the three-dimensional shape of the upper surface and the thickness of the second stratum in component 2 of the current terrain polygon. The first code is the most dominant surface expression. See Table 2-8.

3

c-x-l-l

Ssurf_E2

50

Sub-Subsurficial Material Texture of Component 2

The standard terrain texture at the Sub-subsurface. The size, shape and sorting of particles in clastic sediments (or the proportion and degree of decomposition of plant fibre in organic sediments) in the third stratum of the terrain component 2 in the current terrain polygon.

Indicated by 1-3 lowercase letters. The dominant (1), secondary (2), and tertiary (3) standard textures found in a stratigraphic unit are entered as 3, 2, 1 (see the Terrain Classification Manual, Howes and Kenk, Version 2.0). If only one or two textures are given, the remaining spaces are left blank. See Table 2-5.

3

c-x-r-l

Tttex_2

51

Sub-Subsurficial Material of Component 2

The formative geomorphological process of the Sub-substratum of surficial material of component 2 of the current terrain polygon. See Table 2-6.

2

c-x-l-u

Tsurfm_2

52

Sub-Subsurficial Material Qualifier of Component 2

A code used to specify whether the formative geomorphological process of the first stratum of surficial deposit of component 2 is currently `active' (`A') or `inactive' (`I'). The assumed status is not recorded.

Note: `G' is now coded directly with the genetic material (see previous item). See Table 2-7.

1

c-x-l-u

Tsurfm_

Q2

53

Sub-Subsurficial Material Subtype of Component 2

A project-specific code for the subtype of the surficial material in the Sub-substratum of the component of the current terrain polygon. A surficial material subtype is distinguished by characteristics that cannot be adequately represented by standard terrain classes. See Table 2-29.

1

n-x-r

Tsurfm_

St2

54

Sub-Subsurface Expression of Component 2

A series of 1-3 lowercase letter codes used in combination to describe the three-dimensional shape of the upper surface and the thickness of the Sub-substratum in the component of the current terrain polygon. The first code is the most dominant surface expression. See Table 2-8.

3

c-x-l-l

Tsurf_E2

55

Relation of Component 2 and 3

A general indicator of the relative areal proportions of the second and third components of the current terrain polygon. See Table 2-14.

2

c-x-l

Comrel2_3

56

Decile of Terrain Component 3

Describes the proportion of the polygon covered by Component 3, in deciles.

Note: The deciles of Components 1-3 must total 10 (i.e., 5-3-2 or 6-4, if the first two deciles total 10 then the third decile is not filled out). Decile 1 must be greater or equal to decile 2, which must be greater or equal to decile 3. The dominant component of surficial material(s) in a terrain polygon; designated by a decile, (8 means 80%; no entry means 100%)

2

n-x-r

Tdec_3

57

Partial Cover Flag of Component 3

A single slash `/' indicates that the overlying material in the terrain component only partially covers the underlying material. Eolian veneer is an example.

Note this is a new term added to the Terrain Classification Manual, Howes and Kenk, Version 2.0.

1

c-x-l

Prtflg_3

58

Surficial Material Texture of Component 3

The standard terrain texture at the surface. The size, shape and sorting of particles in clastic sediments (or the proportion and degree of decomposition of plant fibre in organic sediments) in the first stratum of the terrain component 3 in the current terrain polygon.

Indicated by 1-3 lowercase letters. The dominant (1), secondary (2), and tertiary (3) standard textures found in a stratigraphic unit are entered as 3, 2, 1 (see the Terrain Classification Manual, Howes and Kenk, Version 2.0). If only one or two textures are given, the remaining spaces are left blank. See Table 2-5.

3

c-x-r-l

Ttex_3

59

Surficial Material of Component 3

The formative geomorphological process of the first stratum of surficial material of component 3 of the current terrain polygon. See Table 2-6.

2

c-x-l-u

Surfm_3

60

Surficial Material Qualifier of Component 3

A code used to specify whether the formative geomorphological process of the first stratum of surficial deposit of component 3 is currently `active' (`A') or `inactive' (`I'). The assumed status is not recorded.

Note: `G' is now coded directly with the genetic material (see previous item). See Table 2-7.

1

c-x-l-u

Surfm_Q3

61

Surficial Material Subtype of Component 3

A project-specific code for the subtype of the surficial material in the first stratum of component 3 of the current terrain polygon. A surficial material subtype is distinguished by characteristics that cannot be adequately represented by standard terrain classes. See Table 2-29.

1

n-x-r

Surfm_St3

62

Surface Expression of Component 3

A series of 1-3 lowercase letter codes used in combination to describe the three-dimensional shape of the upper surface and the thickness of the first stratum in the component of the current terrain polygon. The first code is the most dominant surface expression. See Table 2-8.

3

c-x-l-l

Surf_E3

63

Bedrock Type of Component 3

The type of bedrock in the terrain component. (This is only applicable where surficial material is of origin type `R'). See Table 2-4.

These bedrock classes are new to the Terrain Classification System. The intent of using the bedrock code is to provide auxiliary information, as to help qualify texture and/or terrain stability information. It is not intended to provide bedrock stratigraphy.

2

c-x-l-l

Bedrock_3

64

Subsurficial Material Texture of Component 3

The standard terrain texture at the first subsurface stratum. The size, shape and sorting of particles in clastic sediments (or the proportion and degree of decomposition of plant fibre in organic sediments) in the first stratum of terrain component 3 in the current terrain polygon.

Indicated by 1-3 lowercase letters. The dominant (1), secondary (2), and tertiary (3) standard textures found in a stratigraphic unit are entered as 3, 2, 1 (see the Terrain Classification Manual, Howes and Kenk, Version 2.0). If only one or two textures are given, the remaining spaces are left blank. See Table 2-5.

3

c-x-r-l

Sttex_3

65

Subsurficial Material of Component 3

A code representing the formative geomorphological process of the first subsurface stratum of surficial material of component 3 of the current terrain polygon.

Note: There is only provision for the coding of one subsurface material, for each component in this database. For the mapping of stratigraphy the user will have to modify and/or create a custom database. See Table 2-6.

2

c-x-l-u

Ssurfm_3

66

Subsurficial Material Qualifier of Component 3

A code used to specify whether the formative geomorphological process of the subsurficial stratum of surficial deposit of component 3 is currently `active' (`A') or `inactive' (`I'). The assumed status is not recorded.

Note: `G' is now coded directly with the genetic material (see previous item). See Table 2-7.

1

c-x-l-u

Ssurfm_Q3

67

Subsurficial Material Subtype of Component 3

A project-specific code that indicates a subclass of the genetic material in the second stratum of component 3 of the current terrain polygon. A surficial material subclass is distinguished by characteristics that cannot be adequately represented by the standard surface material origin classes. See Table 2-29.

1

n-x-r

Ssurfm_

St3

68

Subsurface Expression of Component 3

A series of 1-3 lowercase letter codes used in combination to describe the three-dimensional shape of the upper surface and the thickness of the second stratum in component 3 of the current terrain polygon. The first code is the most dominant surface expression. See Table 2-8.

3

c-x-l-l

Ssurf_E3

69

Sub-Subsurficial Material Texture of Component 3

The standard terrain texture at the Sub-subsurface. The size, shape and sorting of particles in clastic sediments (or the proportion and degree of decomposition of plant fibre in organic sediments) in the third stratum of the terrain component 1 in the current terrain polygon.

Indicated by 1-3 lowercase letters. The dominant (1), secondary (2), and tertiary (3) standard textures found in a stratigraphic unit are entered as 3, 2, 1 (see the Terrain Classification Manual, Howes and Kenk, Version 2.0). If only one or two textures are given, the remaining spaces are left blank. See Table 2-5.

3

c-x-r-l

Tttex_3

70

Sub-Subsurficial Material of Component 3

The formative geomorphological process of the Sub-substratum of surficial material of component 3 of the current terrain polygon. See Table 2-6.

2

c-x-l-u

Tsurfm_3

71

Sub-Subsurficial Material Qualifier of Component 3

A code used to specify whether the formative geomorphological process of the first stratum of surficial deposit of component 3 is currently `active' (`A') or `inactive' (`I'). The assumed status is not recorded.

Note: `G' is now coded directly with the genetic material (see previous item). See Table 2-7.

1

c-x-l-u

Tsurfm_

Q3

72

Sub-Subsurficial Material Subtype of Component 3

A project-specific code for the subtype of the surficial material in the Sub-substratum of the component of the current terrain polygon. A surficial material subtype is distinguished by characteristics that cannot be adequately represented by standard terrain classes. See Table 2-29.

1

n-x-r

Tsurfm_

St3

73

Sub-Subsurface Expression of Component 3

A series of 1-3 lowercase letter codes used in combination to describe the three-dimensional shape of the upper surface and the thickness of the Sub-substratum in the component of the current terrain polygon. The first code is the most dominant surface expression. See Table 2-8.

3

c-x-l-l

Tsurf_E3

74

Polygon Number

A repeat of the polygon number on the first page of the form. Repeated on the second page to facilitate correct data entry, only if this type of spreadsheet/database is used.

5

n-e-r

Poly_Nbr

75

1st Geomorphological Process Class

An uppercase letter representing the sole or most significant geomorphological process to affect terrain within the current polygon.

A new process has been added to the Terrain Classification Manual, Howes and Kenk, Version 2.0; `L' indicating active seepage. See Table 2-9.

1

c-x-l-u

Geop_1

76

1st Process Qualifier

A code used to specify whether the first geomorphologic process of the polygon is currently `active (`A'), or `inactive' (`I'). See Table 2-7.

1

c-x-l-u

Geop_Q1

77

1st Process Subtype

A project-specific numeric code used to further specify the first geomorphological process within the current terrain polygon. Project specific subtypes of the standard geomorphological processes may be established to distinguish characteristics that cannot be adequately represented by the standard process classes alone. These subtypes should be described in the terrain legend. See Table 2-30.

1

n-x-r

Geop_St1

78

1st Process Subclass

1-3 standard lower case letters attached to the first geomorphological process within the current terrain polygon. Subclass modifiers are used to further describe the process. They are usually mapped at a more detailed level. New subclass modifiers have been added to the classification. See Tables 2-10 - 2-13.

3

c-x-l-l

Geop_

Scm1

79

2nd Geomorphological Process Class

An uppercase letter representing the second most significant geomorphological process to affect terrain within the current polygon. See Table 2-9.

1

c-x-l-u

Geop_2

80

2nd Process Qualifier

A code used to specify whether the second geomorphologic process of the polygon is currently `active (`A'), or `inactive' (`I'). See Table 2-7.

1

c-x-l-u

Geop_Q2

81

2nd Process Subtype

A project-specific numeric code used to further specify the second geomorphological process within the current terrain polygon. Project specific subtypes of the standard geomorphological processes may be established to distinguish characteristics that cannot be adequately represented by the standard process classes alone. These subtypes should be described in the terrain legend. See Table 2-30.

1

n-x-r

Geop_St2

82

2nd Process Subclass

1-3 standard lower case letters attached to the second geomorphological process within the current terrain polygon. Subclass modifiers are used to further describe the process. They are usually mapped at a more detailed level. New subclass modifiers have been added to the Terrain Classification Manual, Howes and Kenk, Version 2.0. See Tables 2-10 - 2-13

3

c-x-l-l

Geop_ Scm2

83

3rd Geomorphological Process Class

An uppercase letter representing the third most significant geomorphological process to affect terrain within the current polygon. See Table 2-9.

1

c-x-l-u

Geop_3

84

3rd Process Qualifier

A code used to specify whether the third geomorphologic process of the polygon is currently `active (`A'), or `inactive' (`I'). See Table 2-7.

1

c-x-l-u

Geop_Q3

85

3rd Process Subtype

A project-specific numeric code used to further specify the third geomorphological process within the current terrain polygon. Project specific subtypes of the standard geomorphological processes may be established to distinguish characteristics that cannot be adequately represented by the standard process classes alone. These subtypes should be described in the terrain legend. See Table 2-30.

1

n-x-r

Geop_St3

86

3rd Process Subclass

1-3 standard lower case letters attached to the third geomorphological process within the current terrain polygon. Subclass modifiers are used to further describe the process. They are usually mapped at a more detailed level. New subclass modifiers have been added to the Terrain Classification Manual, Howes and Kenk, Version 2.0. See Tables 2-10 - 2-13.

3

c-x-l-l

Geop_ Scm3

87

1st Soil Drainage Class of Polygon

A lowercase letter that represents the soil drainage class for all or most of the current terrain polygon. Soil drainage refers to the rapidity and extent of water removal from the soil in relation to additions; this refers to the annual moisture status of the soil, not just the permeability. Codes include r, w, m, i, p, v. (see Luttmerding et al., 1990, p.43). See Table 2-15.

1

c-x-l-l

Drain_1

88

Soil Drainage Separator of Polygon

Symbols used where a terrain polygon includes two areas of relatively uniform drainage, indicating the proportion of the polygon occupied by each class. The codes include a comma `,' ; a dash, `-'; (single slash `/'; double slash `//' :These are not commonly used) . See Table 2-16.

2

c-x-l

Drain_Sep

89

2nd Soil Drainage Class of Polygon

A lowercase letter that represents the drainage class for less than half of the current terrain polygon. Soil drainage refers to the rapidity and extent of water removal from the soil in relation to additions (see Luttmerding et al., 1990, p.43). See Table 2-15.

1

c-x-l-l

Drain_2

90

Slope: Lower Limit of Dominant Slope Range

The lower limit of the range of slopes within a terrain polygon, or, where a polygon includes distinctly gentler and steeper slopes (e.g., stepped topography), the lower limit of the slope range associated with most of the polygon. The lower limit could be 12%; data must be entered either in degrees or as a percentage, not both. See Table 2-17.

3

n-x-r

Slpll_1

91

Slope: Upper Limit of Dominant Slope Range

The upper limit of the range of slopes within a terrain polygon, or where a polygon includes distinctly gentler and steeper slopes (i.e. stepped topography), the upper limit of the slope range associated with most of the polygon. The upper limit could be 27%; data must be entered either in degrees or as a percentage, not both. See Table 2-17.

3

n-x-r

Slpul_1

92

Slope Relation

The relative proportion of the two terrain slopes which make up the terrain polygon. The codes are comma `,' indicating two distinct slope portions, and a dash `-' indicating one sloped portion grading to another.

1

c-x-l

Slp_Rel

93

Slope: Lower Limit of Subdominant Slope Range

The lower limit of the range of slopes within a terrain polygon, or, where a polygon includes distinctly gentler and steeper slopes (e.g., stepped topography), the lower limit of the subdominant slope range associated with the polygon. The lower limit could be 2%; data must be entered either in degrees or as a percentage, not both. See Table 2-17.

3

n-x-r

Slpll_2

94

Slope: Upper Limit of Subdominant Slope Range

The upper limit of the range of slopes within a terrain polygon, or where a polygon includes distinctly gentler and steeper slopes (i.e. stepped topography), the upper limit of the subdominant slope range associated with the polygon. The upper limit could be 10%; data must be entered either in degrees or as a percentage, both. See Table 2-17.

3

n-x-r

Slpul_2

95

Slope Stability Class

A code representing a class of slope stability. The code must be only one of the standard codes defined, either E1or E2, Recon, or Detailed slope stability classification systems. All polygons mapped within a project must be consistently classified using the same slope stability classification system. See Tables 2-18 - 2-20.

2

an-x-l-u

Slpstb_Cls

96

Slope Stability Qualifier For Roads

A flag indicating class IV terrain where road construction is likely to cause landslides, but harvesting (without roads) is not likely to cause landslides (see Forest Practices Code, 1995, p.9). See Table 2-21.

1

a-x-l-u

Rdstb_Flg

97

Surface Erosion Potential Class

A class which indicates the likelihood of soil erosion on bare or disturbed soil after logging or road construction (e.g. from ditches or cutbanks). Surface erosion refers to the removal of soil, particle by particle, by surface runoff. It results in sheet erosion and the development of rills and gullies. See Table 2-22.

2

a-x-l-u

Sfcero_Pot

98

Landslide Induced Stream Sedimentation Class

A rating class indicating the likelihood of landslide-induced stream sedimentation. See Table 2-23.

1

n-x-r

Lssed_Cls

99

Surface Erosion Sedimentation Class

A rating class indicating the likelihood of stream sedimentation due to surface erosion. This rating is assigned by the terrain mapper on the basis of air photo interpretation with occasional field confirmation. See Table 2-24.

2

a-x-l-l

Sesed_Cls

100

Bouldery or Blocky Substrate of Polygon

A flag `b' indicating that the ground within the current polygon is covered by sufficiently large clasts to adversely affect soil development and forest growth. This area will present severe problems for restocking after logging due to absence of topsoil. This flag was the result of discussion with forest companies. (1995, with J.M. Ryder and Geologists). See Table 2-25.

1

a-x-l-l

Bbsub_Flg

101

Mean Aspect of Polygon

The general direction in which the current polygon is facing, measured to the nearest degree of azimuth. See Table 2-25.

3

n-x-r

Mean_Asp

102

Ea Avalanche Hazard Flag

A flag indicating that timber removal from the current polygon may result in increased avalanche hazard to sites downslope. This designation is from the BC Forest Service Environmentally Sensitive Mapping Codes in the Historical Forest Cover Mapping System. See Table 2-26.

1

a-x-l-l

Avlhaz_

Flg

103

Polygons of Relatively Low Reliability

A flag indicating that for reasons such as cloud cover on an air photo the current polygon has been mapped with significantly less reliability than adjacent polygons. See Table 2-27.

1

a-x-l-u

Lowrel_

Flg

104

Field Check of Polygon

A class which describes the level of field checking done on the current polygon (detailed/reconn/visual). See Table 2-28.

1

a-x-l-l

Fldchktp

105

Comments

This field may be used to record any pertinent information regarding the polygon. At all times attempt to use referenced classifications which are well defined and understood in the science, or provide thorough definitions for the user. This project specific data will be stored in flat file format, unless keyword or standard designations are required, then contact the data custodian. The data custodian will keep records of new or additional classifications, which are commonly used for project specific applications.

300

c-e-l

Comments


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