AGRASID: Polygon Attribute Table (AG30)

Identification Information

Citation:
Citation_Information:
Originator:
Alberta Soil Information Centre. 2001.  AGRASID 3.0: Agricultural Region of Alberta Soil Inventory Database (Version  3.0). Edited by J.A. Brierley, T.C. Martin, and D.J. Spiess.  Agriculture and Agri-Food Canada, Research Branch; Alberta Agricultrue, Food and Rural Development, Conservation and Development Branch. Available:Alberta Soil Information Centre
Publication_Date:
February, 2001
Title:
AGRASID Version 3.0 Polygon Attribute Table
Geospatial_Data_Presentation_Form: Vector and tablular digital data.
Description:
Abstract:
AG30 is the polygon attribute file (PAT) accompanying AGRASID Version 3.0.  It is a modified version of the original AGRASID.PAT (Version 1.0). The principal difference of Version 3.0 from Version 1.0 is the removal of the township grid from the graphic layer. The implication of this modification is that the number of polygons described in the database files are reduced from approximately 65,000 to 28,000. This means that the derivation of value-added products from AGRASID is expedited. Other modifications include the correction of some identified errors in the database. Also the boundaries and descriptions of some Land System boundaries have been modified.

With the reduction of the number of AGRASID Version 3.0 soil lanscape polygons, there now exists a one to one relationship between the soil landscape polygons and the soil landscape attribute information. As a result the soil lanscape attributes are no longer stored in a separate file as was the case in AGRASID Version 1.0. The soil landscape attribute information is now stored in AG30 polygon attribute table. For this reason there is no longer a separate soil landscape table present in AGRASID Version 3.0.

The user may also notice that the outside boundaries of AGRASID Version 3.0 do not exactly match the forty-ninth and sixtieth parallels of latitude and the one hundred and tenth, and one hundred and twentieth meridians of longitude.  The reason is that AGRASID was originally compiled on the Alberta township grid system, as found in the province's 1:20,000 scale base map. This means that AGRASID Version 3.0 will not necessarily follow the federal or provincial boundaries of the province.

Purpose:
Updates the 1:100 000 digital soils database called AGRASID version 1.0. Provides linkages to the spatial data comprising AGRASID Version 3.0  as well as descibing the pertinent soil landscape attributes associated with each soil landscape polygon. Provides the linkage to the basic soil evidence file. AG30MAS.
Time_Period_of_Content:
        Time_Period_Information:
        Single_Date/Time:
 
        Calendar_Date:  Februrary 2001.
 
        Currentness_Reference:1998.
Status:
        Progress: Complete
        Maintenance_and_Update_Frequency:As Required.
Spatial_Domain:
        Bounding_Coordinates:
            West_Bounding_Coordinate: -119.349368
            East_Bounding_Coordinate: -108.716342
            North_Bounding_Coordinate: 58.554289
            South_Bounding_Coordinate: 48.923585
Keywords:
        Theme:
            Theme_Keyword_Thesaurus:
         Soil inventory database
            Theme_Keyword:
         Soil Landscape, Soil landscape database, Land Systems
Access_Constraints:
Available for download at the Ropin' the Web site at the Alberta Soil Information Centre page.
Use_Constraints:
Acknowledge source with appropriate citation.
Native_Data_Set_Environment:
Windows NT Version 4.0 (Build 1381) Service Pack 5; ESRI ArcInfo 8.1.0.415

Spatial Data Organization Information

Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Complete chain
Point_and_Vector_Object_Count: 83378
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Entity point
Point_and_Vector_Object_Count: 0
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 0
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 4

Spatial Reference Information

Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Transverse Mercator
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999200
Longitude_of_Central_Meridian: -115.000000
False_Easting: 500000.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.002048
Ordinate_Resolution: 0.002048
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: NAD83 CNT
Ellipsoid_Name: GRS 1980
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio:

Entity and Attribute Information

Detailed_Description:
Entity_Type:
Entity_Type_Label: AG30.PAT
Attribute:
        Attribute_Label: SHAPE: Geometry of the Features
Attribute:
        Attribute_Label: AREA: Area of polygon (square meters)
Attribute:
        Attribute_Label: PERIMETER: Perimeter of polygon (meters)
Attribute:
        Attribute_Label: AG30#: ESRI Coverage internal record number
Attribute:
        Attribute_Label: AG30-ID: ESRI Coverage internal ID number
Attribute:
        Attribute_Label:POLYNUMB: Agrasid 3.0 Primary Key, unique for each polygon. Allowable values between 0 and 28370.
Attribute:
        Attribute_Label: HECTARES: Area of Polygon (hectares)
Attribute:
        Attribute_Label: SCA: Soil correlation area number. The province is subdivided into 23 areas based upon climate, which in turn determine soil development, vegetation, soil use and management (Alberta SNF Group 1993).
Attribute:
        Attribute_Label:LMOD: Landscape model modifier (Table 3 in the User's Manual )
Attribute:
        Attribute_Label:LMODEL: Landscape model (Table 2 in the User's Manual)
Attribute:
        Attribute_Label:MUNAME: Generated soil symbol based upon the soil data collected and documented
        by the soil mapper. For explanation of the concepts and symbol refer toSection 2.0 of the Procedures Manual.
Attribute:
        Attribute_Label: ECODIST: Concatenation of ECO_REG and ECO_DIST
Attribute:
        Attribute_Label:ECO_REG: Ecoregion code.
Attribute:
        Attribute_Label:ECO_DIST: Ecodistrict code.
Attribute:
        Attribute_Label:NSLC2000: New Soil Landscape of Canada (SLC) number created in June, 2000.  Reference SLC Alberta Phase 1 White Zone, June 2000 - available from C&D.  There are some AGRASID Version 3.0 soil landscape records which will have an unspecified NSLC2000 number.  These soil lanscapes are associated with anthropogenic features (e.g. cities) or boarder the non - agricultural (green) area of Alberta. Completion of SLC updates in the non - agricultural (green) area of Alberta may eventually eliminate this situation.
Attribute:
        Attribute_Label:LSYS_NO: Land system number. Unique number identifying each land system within an Ecodistrict.
Attribute:
        Attribute_Label:LS_COMP:Alpha Numeric Code given to non-contiguous components of a land system that may otherwise be considered collectively as a single land system.  For e.g., a land system may be separated by a major river into 2 components: A & B.
Attribute:
        Attribute_Label:LS_SYM:Land System symbol. This field is a unique identifier for each land system. It is a concatenation of [ECO_REG]+[ECO_DIST]+[LSYS_NO]+[LS_COMP]. The presence of this foreign key makes the linkage between the AG30 polygon attribute table and the AG30LSLG.
Attribute:
        Attribute_Label:LSLGDSYM: Land System Legend Symbol. LSLGSYM is a concatenation of [ECO_REG]+[ECO_DIST]+[LSYS_NO]. This field is the foreign key that makes the link possible to all the descriptive (non-spatial) information concerning a Land System. LSLGDSYM is the link field to the LS_LEGND.DBF.
Attribute:
        Attribute_Label: TOWNSHIP: Alberta Township System township number.
Attribute:
        Attribute_Label: RANGE: Alberta Township System range number.
Attribute:
        Attribute_Label: MERIDIAN: Alberta Township System meridian number.
Attribute:
        Attribute_Label:LOCATOR: Location field identifying the centroid of each polygon.  Concantenation of [Meridian]+[Range]+[Township] System.
Attribute:
        Attribute_Label:LEG_DESC: Alberta Township System Legal Description text label developed by the Conservation and Development Branch AAFRD and is of the form 1-T111R11W6.
 

Where:	T = Township
	R = Range
	W = West of a specified meridian