Digital Overlay for Soils of Assumption Parish, Louisiana

Metadata:
Identification_Information:
Citation:
Citation_Information:
Originator:
United States Geological Survey's National Wetlands Research Center (NWRC), and Natural Resource Conservation Service (NRCS)
Publication_Date: 20011031
Title: Digital Overlay for Soils of Assumption Parish, Louisiana
Geospatial_Data_Presentation_Form: Vector Digital Data
Publication_Information:
Publication_Place: Lafayette, Louisiana, US
Publisher: USGS, Biological Resources Division's, and NWRC
Description:
Abstract:
This data set contains vector line map information. The vector data contain selected base categories of geographic features, and characteristics of these features, in digital form. The information was collected by digitizing and/or scanning soil information complied onto 7.5-minute quadrangle mylar sheets, creating an editable, digital soil coverage. The data set used 1:24000 scale hardcopy USGS standard quadrangle maps and the State Soil Survey of Assumption Parish as a data development resource. The classified data was derived from actual field identification and sampling performed by the Natural Resource Conservation Service (NRCS), in Alexandria, Louisiana (formerly Soil Conservation Service). Digital data is available by parish. The digital data is not Soil Survey Geographic database (SSURGO) certified.
Purpose:
To provide digital overlays of the soils of Louisiana by parish for the NRCS, that can be updated and used as a layer in a GIS application.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19971001
Ending_Date: 20011031
Currentness_Reference: Publication date of sources
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Irregular
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -91.260
East_Bounding_Coordinate: -90.885
North_Bounding_Coordinate: 30.081
South_Bounding_Coordinate: 29.625
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Vector line data
Theme_Keyword: Soils
Theme_Keyword: Digital Data
Theme_Keyword: ARC/INFO
Theme_Keyword: NRCS
Theme_Keyword: Parish
Place:
Place_Keyword_Thesaurus:
Department of Commerce, 1990, Counties and Equivalent Entities of the United States, its Possessions, and Associated Areas (Federal Information Processing Standard 6-4): Washington, Department of Commerce, National Institute of Standards and Technology.
Place_Keyword: Louisiana
Place_Keyword: Louisiana Coastal Zone
Place_Keyword: Assumption Parish
Temporal:
Temporal_Keyword_Thesaurus: None
Temporal_Keyword: 2000
Access_Constraints:
It is strongly recommended that this data is directly acquired from the distributor described above or from another USGS Biological Resources Division server and not indirectly through other sources which may have changed the data in some way. The distributor makes no claims as to the data's suitability for other purposes.
Use_Constraints:
Acknowledgment of the NWRC as a data source would be appreciated in products developed from this data, and such acknowledgment as is standard for citation and legal practices for data source is expected by users of this data. Sharing new data layers developed directly from this data would also be appreciated by NWRC staff. Users should be aware that comparisons with other data sets for the same area from other time periods might be inaccurate due to inconsistencies resulting from changes in photo interpretation, mapping conventions, and digital processes over time. This data is not a legal document and is not to be used as such. This data is not STATSGO or SSURGO certified.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: USGS BRD's National Wetlands Research Center
Contact_Person: Steve Hartley
Contact_Position: Senior Geographer/GIS Analyst
Contact_Address:
Address_Type: Mailing and Physical Address
Address: 700 Cajundome Blvd
City: Lafayette
State_or_Province: Louisiana
Postal_Code: 70506
Contact_Voice_Telephone: 337-266-8543
Contact_Facsimile_Telephone: 337-266-8616
Contact_Electronic_Mail_Address: steve_hartley@usgs.gov
Hours_of_Service: 8:00 am to 4:00 pm CST Monday through Friday
Data_Set_Credit:
The NWRC acknowledges the NRCS for use of data derived from the SSURGO soils maps for Assumption Parish, Louisiana.
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The accuracy is not based on a formal quantitative assessment and was based on the judgement of the soil conservationist in the field. Ground truthing was not performed for this project. To attain a better estimate of accuracy, a formal re-evaluation of the soils of Assumption Parish, Louisiana would be necessary to see if there are areas where discrepancies exist.
Logical_Consistency_Report:
All polygons are closed, and have been cleaned in an editing environment. Adjacent polygons do not have identical attributes. Each polygon has one and only one attribute.
Completeness_Report:
All data sets were derived in the same general format. All soil information was transferred onto transparent mylar sheets, for each topographic quadrangle in the parish, from the existing State Soils Survey for the parish. Mylar overlays were digitized (entered at an error of less than .005 for geographic positioning) and/or scanned then rectified. Each quadrangle mylar overlay was digitized and/or scanned separately and therefore may represent different amounts of human and/or equipment error. Land-water interfaces were corrected by best judgement on-screen digitizing to Digital Orthophoto Quarter Quadrangles (DOQQ's). For parishes created before DOQQ's were available, the land-water interfaces were included on the mylar sheets. For parishes created after DOQQ's became available, the land-water interfaces were digitized on-screen separately from the soil lines; therefore they are not included on the mylar sheets. The land-water coverages and soil line coverages were then appended and cleaned to create the total quadrangle coverage. Each quadrangle was edited individually, and then all quadrangles in the parish were joined together. Once joined together, editing was done along all quadrangle boundaries to match lines and labels. When line or label errors were found, all corrections were made upon approval of the NRCS. Problems with labeling occurred along adjoining parish boundaries, due to different labeling conventions in each parish. A standard labeling convention system for the whole state of Louisiana must be created to remedy the problem. Until this standard is developed, the following labeling tactics have been used. New labels were created for parish coverages in order to match labels for adjoining parishes. Changes were dependent upon soil definition, polygon size, and cases of duplication problems. A duplication problem means the label already existed in the parish coverage and is a different unit altogether and therefore can not be added to that legend. New labels were also created when new lines were needed to reduce confusion. Lines were added in special cases: 1) if it was advantageous to extend an unit a small portion into the next parish, rather than renaming the whole polygon; and 2) if the two units adjoining are similar, differing only in transitional phase, then a line was added at the most logical area of transition, aided by imagery, in order to keep the two units separate. New labels were created in the coverages which the line was added as long as there was not duplication problems. If major complications occurred when trying to add labels, these areas were left as is, waiting for a standard soil convention. These problems can be fixed after a standard Louisiana State soil code convention is established. The attribute legend for Assumption Parish is found in the Entity and Attribute Section. This includes current modifications for completeness with surrounding parishes. All changes to the Assumption Parish soils lines and legend are documented in a report to be stored with the state soils archives at the NRCS in Alexandria, LA. Modifications to the Assumption Parish legend include the following: Added HpA, from Terrebonne, extended into Assumption as a new polygon; Added Sr, from Lafourche, where a line was extended into Assumption Parish; A few soil code names have changed to soils that lie below the Louisiana thermal line, changes in Assumption include; Commerce to Cancienne, Sharkey to Schriever, and Tunica to Thibaut.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report: Not applicable
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report: Not applicable
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator:
United States Department of Agriculture (USDA), in cooperation with the Louisiana Agricultural Experiment Station.
Publication_Date: Unknown
Title: Soil delineated aerial photography
Geospatial_Data_Presentation_Form: Remote-sensing image
Publication_Information:
Publication_Place: Alexandria, Louisiana
Publisher: USDA, NRCS
Source_Scale_Denominator: 24000
Type_of_Source_Media: Stable-based Material
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19700101
Ending_Date: 19900101
Source_Currentness_Reference: Date of source material
Source_Citation_Abbreviation: USDA Map
Source_Contribution: Spatial and Attribute information for soil units.
Source_Information:
Source_Citation:
Citation_Information:
Originator:
USDA, NRCS, in cooperation with Louisiana Agricultural Experiment Station and Louisiana Soil and Water Conservation Committee.
Publication_Date: 19750901
Title: Soil Survey of Assumption Parish, Louisiana
Geospatial_Data_Presentation_Form: Document
Publication_Information:
Publication_Place: Alexandria, Louisiana
Publisher: USDA, NRCS
Source_Scale_Denominator: 20000
Type_of_Source_Media: Paper
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19700101
Ending_Date: 19900101
Source_Currentness_Reference: Date of source material
Source_Citation_Abbreviation: USDA, NRCS
Source_Contribution: Secondary attribute information for soil units.
Source_Information:
Source_Citation:
Citation_Information:
Originator: National Digital Orthophoto Program (NDOP).
Publication_Date: 19981125
Title: Digital Orthophoto Quarter Quadrangles (DOQQ)
Edition: 1996
Geospatial_Data_Presentation_Form: Color Digital Imagery (Raster)
Publication_Information:
Publication_Place: Fort Worth, Texas
Publisher: USDA, NRCS, and National Cartography and Geospatial Center.
Type_of_Source_Media: Digital Imagery
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19980110
Ending_Date: 19981125
Source_Currentness_Reference: Publication date of Image
Source_Citation_Abbreviation: DOQQ
Source_Contribution: Data for land cover/land use classification
Process_Step:
Process_Description:
The following is a generalized description of the processes used in creating the parish soil digital coverages for Louisiana. Data for some parish soil maps may vary slightly. The data set was compiled by taking 1:24000 ratios, of the NRCS's original soil lines drawn over aerial photography,and transferring them to 7.5 minute quadrangles mylar sheets with a scale of 1:24000 aided by the most accurate and available imagery. Soil lines for Assumption Parish were intially compiled by the NRCS, however the processes that follow were all performed at the NWRC. The compiled soil lines for each quadrangle were then digitized and/or scanned individually. All quadrangles were then appended, cleaned, joined together and labeled to form the body of the parish converages. On-screen land-water interfaces for every quadrangle were constructed, utilizing digital orthophoto quarter quadrangles (DOQQ's) after the soil lines were digital. On-screen and tablet digitizing was done using Production ARC/Edit, an adaptation of ESRI's ARC/Edit module. Scanning was performed on the IDEAL, FSC 8010 Color Scanner utilizing CADImage_Scan+Feature version 1.0 software and I_Vector version 3.81 for vectorization. The ARC/Edit module was used for coverage generation with geospatial data, building, cleaning, and joining coverages. Polygons were assigned attributes, as labels, in ARCView. The information is stored both as an ARC/Info coverage and an exported .e00 compression file.
Process_Date: 1998
Spatial_Data_Organization_Information:
Indirect_Spatial_Reference: The State of Louisiana
Direct_Spatial_Reference_Method: Vector
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 15
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: .9996
Longitude_of_Central_Meridian: -93
Latitude_of_Projection_Origin: 0
False_Easting: 500,000
False_Northing: 0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: Coordinate Pair
Coordinate_Representation:
Abscissa_Resolution: .61
Ordinate_Resolution: .61
Planar_Distance_Units: Meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: GRS 1980
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: Soils
Entity_Type_Definition:
A natural, three-dimensional body at the earth's surface. It is capable of supporting plants and has properties resulting from the integrated effect of climate and living matter acting on earthy parent material, as conditioned by relief over periods of time.
Entity_Type_Definition_Source: USDA, NRCS, and Soil Survey of Assumption Parish.
Attribute:
Attribute_Label: soil_code
Attribute_Definition: Codes for soil units
Attribute_Definition_Source:
Soil Survey for Assumption Parish, Louisiana: NRCS, in cooperation with Louisiana Agricultural Experiment Station and Louisiana Soil and Water Conservation Committee. Alexandria, Louisiana, USDA.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: BA
Enumerated_Domain_Value_Definition: Barbary Association
Enumerated_Domain_Value_Definition_Source:
Soil Survey for Assumption Parish, Louisiana: NRCS, in cooperation with Louisiana Agricultural Experiment Station and Louisiana Soil and Water Conservation Committee. Alexandria, Louisiana, USDA.
Enumerated_Domain:
Enumerated_Domain_Value: Cc
Enumerated_Domain_Value_Definition: Cancienne (Commerce) Silt Loam
Enumerated_Domain_Value_Definition_Source:
Soil Survey for Assumption Parish, Louisiana: NRCS, in cooperation with Louisiana Agricultural Experiment Station and Louisiana Soil and Water Conservation Committee. Alexandria, Louisiana, USDA.
Enumerated_Domain:
Enumerated_Domain_Value: Cm
Enumerated_Domain_Value_Definition: Cancienne (Commerce) Silt Clay Loam
Enumerated_Domain_Value_Definition_Source:
Soil Survey for Assumption Parish, Louisiana: NRCS, in cooperation with Louisiana Agricultural Experiment Station and Louisiana Soil and Water Conservation Committee. Alexandria, Louisiana, USDA.
Enumerated_Domain:
Enumerated_Domain_Value: FA
Enumerated_Domain_Value_Definition: Fausse Association
Enumerated_Domain_Value_Definition_Source:
Soil Survey for Assumption Parish, Louisiana: NRCS, in cooperation with Louisiana Agricultural Experiment Station and Louisiana Soil and Water Conservation Committee. Alexandria, Louisiana, USDA.
Enumerated_Domain:
Enumerated_Domain_Value: HpA
Enumerated_Domain_Value_Definition: Harahan Clay, Occasionally Flooded
Enumerated_Domain_Value_Definition_Source:
Soil Survey for Assumption Parish, Louisiana: NRCS, in cooperation with Louisiana Agricultural Experiment Station and Louisiana Soil and Water Conservation Committee. Alexandria, Louisiana, USDA.
Enumerated_Domain:
Enumerated_Domain_Value: Sa
Enumerated_Domain_Value_Definition: Schriever (Sharkey) Silty Clay Loam
Enumerated_Domain_Value_Definition_Source:
Soil Survey for Assumption Parish, Louisiana: NRCS, in cooperation with Louisiana Agricultural Experiment Station and Louisiana Soil and Water Conservation Committee. Alexandria, Louisiana, USDA.
Enumerated_Domain:
Enumerated_Domain_Value: Sh
Enumerated_Domain_Value_Definition: Schriever (Sharkey) Clay
Enumerated_Domain_Value_Definition_Source:
Soil Survey for Assumption Parish, Louisiana: NRCS, in cooperation with Louisiana Agricultural Experiment Station and Louisiana Soil and Water Conservation Committee. Alexandria, Louisiana, USDA.
Enumerated_Domain:
Enumerated_Domain_Value: Sk
Enumerated_Domain_Value_Definition: Schriever (Sharkey) Clay, Frequently Flooded
Enumerated_Domain_Value_Definition_Source:
Soil Survey for Assumption Parish, Louisiana: NRCS, in cooperation with Louisiana Agricultural Experiment Station and Louisiana Soil and Water Conservation Committee. Alexandria, Louisiana, USDA.
Enumerated_Domain:
Enumerated_Domain_Value: Sr
Enumerated_Domain_Value_Definition: Schriever (Sharkey) Clay, Occasionally Flooded
Enumerated_Domain_Value_Definition_Source:
Soil Survey for Lafourche Parish, Louisiana: NRCS, in cooperation with Louisiana Agricultural Experiment Station and Louisiana Soil and Water Conservation Committee. Alexandria, Louisiana, USDA.
Enumerated_Domain:
Enumerated_Domain_Value: Tu
Enumerated_Domain_Value_Definition: Thibaut (Tunica) Clay
Enumerated_Domain_Value_Definition_Source:
Soil Survey for Assumption Parish, Louisiana: NRCS, in cooperation with Louisiana Agricultural Experiment Station and Louisiana Soil and Water Conservation Committee. Alexandria, Louisiana, USDA.
Enumerated_Domain:
Enumerated_Domain_Value: water
Enumerated_Domain_Value_Definition: water
Enumerated_Domain_Value_Definition_Source:
Soil Survey for Assumption Parish, Louisiana: NRCS, in cooperation with Louisiana Agricultural Experiment Station and Louisiana Soil and Water Conservation Committee. Alexandria, Louisiana, USDA.
Overview_Description:
Entity_and_Attribute_Overview:
The data set consists of vectored data for the 13 quadrangles in Assumption Parish. Each polygon in the coverage has been assigned a corresponding soil code. The Parish's quadrangles can be found in the "Louisiana Index to topographic and other Map Coverage", published and distributed by the USGS, National Mapping Program. The description of soil codes can be found in the Soil Survey of Assumption Parish.
Entity_and_Attribute_Detail_Citation:
Soil Survey of Assumption Parish, published by the USDA, NRCS, and the Louisiana Index to topographic and other Map Coverage, Published and distributed by the USGS, National Mapping Program.
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: USGS BRD's National Wetlands Research Center
Contact_Person: Steve Hartley
Contact_Position: Senior Geographer/GIS Analyst
Contact_Address:
Address_Type: Mailing and Physical
Address: 700 Cajundome Blvd.
City: Lafayette
State_or_Province: Louisiana
Postal_Code: 70506
Country: USA
Contact_Voice_Telephone: 337-266-8543
Contact_Facsimile_Telephone: 337-266-8616
Contact_Electronic_Mail_Address: steve_hartley@usgs.gov
Hours_of_Service: 8:00 am to 4:00 pm CST Monday through Friday
Resource_Description: NRCS Soil Maps for Assumption Parish
Distribution_Liability:
Although these data have been processed successfully on a computer system at the U.S. Geological Survey, National Wetlands Research Center, no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. It is strongly recommended that these data are directly acquired from a Biological Resources Division server, and not indirectly through other sources which may have changed the data in some way. It is also strongly recommended that careful attention be paid to the contents of the metadata file associated with these data. NWRC shall not be held liable for improper or incorrect use of the data described and/or contained herein. So, these data are provided "as is" and without any express or implied warranties, including, without limitation, the implied warranties or merchantability and fitness for a particular purpose. Also, use of trade names or commercial products in this metadata is solely for the purpose of providing specific information, and does not imply recommendation or endorsement by the US Government. Any downloading and use of these data signifies a user's agreement to comprehension and compliance of the NWRC Standard Disclaimer. Insure all portions of metadata are read and clearly understood before using these data in order to protect both user and NWRC interests.

Metadata_Reference_Information:
Metadata_Date: 20050720
Metadata_Review_Date: 20011031
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Joan C. Kester
Contact_Organization: USGS BRD's National Wetlands Research Center
Contact_Position: Geographer
Contact_Address:
Address_Type: Mailing and Physical Address
Address: 700 Cajundome Blvd
City: Lafayette
State_or_Province: LA
Postal_Code: 70506
Country: USA
Contact_Voice_Telephone: 337-266-8611
Contact_Facsimile_Telephone: 337-266-8616
Contact_Electronic_Mail_Address: joan_kester@usgs.gov
Hours_of_Service: 8:00 am to 4:00 pm CST Monday through Friday
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Access_Constraints: None
Metadata_Use_Constraints:
Acknowledgement of the National Wetlands Research Center as the metadata source would be appreciated. Please cite the original metadata when using portions of the record to create a similar record of slightly altered data, such as reprojection.
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile
Generated by mp version 2.7.33 on Wed Jul 20 13:30:31 2005