Corvallis Forestry Sciences Laboratory
GIS Data Dictionary
Willamette River, Oregon, Active Channel 1932
Table of Contents
IDENTIFICATION_INFORMATION
Citation
Citation_Information
Originator: Stan Gregory, Oregon State University
Publication_Date: 20000315
Title: Willamette River, Oregon, Active Channel 1932
Geospatial_Data_Presentation_Form: Digital vector coverage
Publication_Information
Publication_Place: Corvallis, OR
Publisher: Pacific Northwest Ecosystem Research Consortium
Larger_Work_Citation
Citation_Information
Other_Citation_Details:
The Oregon Historical Society and the Portland Office of the US Army Corps of
Engineers provided the maps and photocopied maps of original U.S. Army Corps of
Engineers river survey maps from 1928-1932.
Online Linkage:
http://www.fsl.orst.edu/pnwerc/river/
Description
Abstract:
This map was created to delineate the extent of the active channel and other
floodplain features for the Willamette River, Oregon, for the year 1932. The
extent of the active channel and features such as alcoves, secondary channels,
and islands were based on US Army Corps of Engineers river survey maps from
1928-1932. Water bodies (primarily main and secondary channels) were captured
from the maps and interpreted for channel type.
Purpose:
This polygon coverage will be used by land managers and government entities
within the Willamette Basin to assess past changes and possible future
management impacts on the river. It will also be used as part of a
research project designed to formulate future scenarios for growth in the
Willamette Valley (Pacific Northwest Ecosystem Research Consortium,
OSU, UO, EPA).
Supplemental_Information:
Procedures_Used:
This coverage was delineated from a U.S. Army Corps of Engineers survey
conducted during three different years in the late 1920s and early 1930s. The
section from Salem to Portland was surveyed in 1928 and selected areas were
resurveyed in 1931 after dredging. The section from Eugene to Salem was
surveyed in 1931 and 1932. The information from these surveys was compiled into
one set of maps, titled "Willamette River, Oregon, Portland to Eugene".
No full set of original maps from this 1932 Army Corps of Engineers survey
and report was available from the National or regional archives or from the
Oregon Historical Society. Photocopies of some of the original maps were
obtained from the Oregon Historical Society (OHS) in Portland, Oregon. Some of
the original maps were not available at OHS and photocopies were made from
either the microfiche at the Portland Office of the U.S.Army Corps of Engineers
or a smaller format photoset held at OHS. All photocopies were scanned at 300dpi
at the USFS Regional Office in Portland, Oregon, or at the Forestry Sciences Lab
in Corvallis, Oregon. The TIFF files were then transferred to USFS Forestry
Sciences Lab in Corvallis, Oregon, where they were put onto the Unix system, or
the TIFF files were compressed and stored on floppy disks and FTP'd into the
Unix system at FSL. Version 7.0.3 Arc Info on Sun workstations was then used for
all further processing of the image and creation of coverages. The TIFF images
were converted to grids using the IMAGEGRID command with square blocking. Each
grid was brought into ArcScan, a component of ArcTools, where it was
georeferenced using any available known points, such as communities, rocks,
channel features.
Georeferencing of the scans was done in reference to the state section and
river coverage, available from the State GIS Service Center, at 1:24,000 We did
attempt to align enduring features, such as major rock formations, communities,
bridges and ferry crossings and to take the geomorphic characteristics of the
river into consideration when weighing options. We estimate map accuracy of
position to be within 20 meters. Relative position of features within each map
(50 maps total) would be within 5 meters (estimated).
After digitizing the coverage it was cleaned with a fuzzy tolerance of .002,
which defaulted to 1 meter. Dangles and overshoots were corrected and the
coverage was then built. All coverages were projected to UTM coordinates, zone
10.
The 1895 river survey scans, also georeferenced for our project (see separate
documentation) and the current river coverage were used to help reconcile map
joins as they were at a larger scale. After georeferencing, the grids were used
as backimages, and desired coverages were then screen digitized. When scanlines
were clean the ArcScan tracing option was used. Coverages created from these
maps include active channel, low water channel, features (points), structures
(line), maximum depths at each transect, roads, railroads and a coverage showing
where original maps joined.
The active channel was defined as the area normally inundated by seasonal
floods with a recurrence interval of 1-2 years and was usually depicted as a
solid line in these maps. Vegetated islands were considered to fall outside of
the active channel, but gravel bars were included within the active channel.
Map codes were interpreted using the reference, Shore and Sea Boundaries, by
Aaron L. Shalowitz, 1962, U.S. Government Printing Office, Washington, D.C.
These data may be used for general, landscape-scale information about channel
placement and characteristics in the 1930s. The original scale of the survey
maps was 1.2" to 500', or about 1:5000. When joining maps we attempted to
resolve any overlaps or gaps of 20m or more. Some of the problems with
georeferencing were inherent in the drafting of the original maps. Other
problems were caused by poor legibility of the original or the scan, lack of
easily recognizable reference points, and slight rotations of the map during
scanning process.
Active channel is defined as the portion of the river and floodplain
innundated at normal winter flood flows (i.e., those with an average return
interval of one to two years). The extent of this area was determined primarily
from vegetation type and presence.
Supplemental_Information:
Revisions:
This is the first version released outside the work group. No further
revisions are planned.
Time_Period_of_Content
Time_Period_Information
Range_of_Dates/Times
Beginning_Date: 19280000
Ending_Date: 19320000
Currentness_Reference: Historical maps
Status
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain
Bounding_Coordinates
West_Bounding_Coordinate: -123.2685
East_Bounding_Coordinate: -122.5977
North_Bounding_Coordinate: 45.5052
South_Bounding_Coordinate: 44.0430
Keywords
Theme
Theme_Keyword_Thesaurus: None
Theme_Keyword: Floodplain
Theme_Keyword: River channel change
Theme_Keyword: Floodplain dynamics
Place
Place_Keyword_Thesaurus: None
Place_Keyword: Willamette River
Place_Keyword: Oregon
Place_Keyword: USA
Access_Constraints: none
Use_Constraints: none
Point_of_Contact
Contact_Information
Contact_Organization: Oregon State University
Contact_Person: Doug Oetter
Contact_Position: Faculty Research Assistant
Contact_Address
Address_Type: mailing and physical address
Address: Dept. of Forest Science
Oregon State University
City: Corvallis
State_or_Province: OR
Postal_Code: 97331
Country: USA
Contact_Voice_Telephone: 541-737-8417
Contact_Facsimile_Telephone: 541-758-7760
Contact_Electronic_Mail_Address: oetter@fsl.orst.edu
Data_Set_Credit
The Oregon Historical Society and the Portland Office of the US Army Corps of
Engineers provided the maps and photocopied maps of original U.S. Army Corps of
Engineers river survey maps from 1928-1932.
Security_Information
Security_Classification_System: None
Security_Classification: Unclassified
Security_Handling_Description: None
Native_Data_Set_Environment
Arc/Info version 7.2.1
/data/ibis/final/channel/ac1932p
DATA_QUALITY_INFORMATION
Attribute_Accuracy
Attribute_Accuracy_Report:
Features in this data set are located using the Universal
Transverse Mercator coordinate system and conform to Level 2
of FIPS 173 (4.1.3.5 Spatial Registration).
Logical_Consistency_Report:
Polygon and arc-node topology exists.
Completeness_Report:
Data set is complete.
Positional_Accuracy
Horizontal_Positional_Accuracy
Horizontal_Positional_Accuracy_Report:
Horizontal positional accuracy is unknown.
Vertical_Positional_Accuracy
Vertical_Positional_Accuracy_Report:
Vertical positional accuracy is unknown.
Lineage
Source_Information
Source_Citation
Originator: US Army Corps of Engineers
Publication_Date: 19320000
Title: Willamette River, Oregon, Portland to Eugene
Edition: Maps 2-24
Publication_Information
Publication_Place: Portland, Oregon
Publisher: US Army Corps of Engineers
Source_Scale_Denominator: 5000
Type_of_Source_Media: Original and photocopied paper maps
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19280000
Ending_Date: 19320000
Source_Currentness_Reference: Published maps
Process_Step
Process_Description:
See procedure narrative above.
Process_Date: 19960000
Process_Contact
Contact_Information
Contact_Organization: Oregon State University
Contact_Person: Paula Minear
Contact_Position: Faculty Research Assisstant
Contact_Address
Address_Type: mailing and physical address
Address: Dept. of Fisheries and Wildlife
Oregon State University
City: Corvallis
State_or_Province: OR
Postal_Code: 97331
Country: USA
Contact_Voice_Telephone: 541-737-1958
Contact_Facsimile_Telephone: 541-737-3590
Contact_Electronic_Mail_Address: paula.minear@orst.edu
Cloud_Cover:
SPATIAL_DATA_ORGANIZATION_INFORMATION
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information
SDTS_Terms_Description
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 359
SPATIAL_REFERENCE_INFORMATION
Grid_Coordinate_System
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal Transverse Mercator (UTM)
UTM_Zone_Number: 10
Planar_Coordinate_Information
Planar_Coordinate_Encoding_Method: Coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 1 m
Ordinate_Resolution: 1 m
Planar_Distance_Units: meters
Geodetic_Model
Horizontal_Datum_Name: North American Datum 1927
Ellipsoid_Name: CLARKE1866
Semi-major_Axis: 6378206.4
Denominator_of_Flattening_Ratio: 294.98
ENTITY_AND_ATTRIBUTE_INFORMATION
Detailed_Description
Entity_Type
Entity_Type_Label: ac1932p.pat
Entity_Type_Definition: Polygon Attribute Table
Entity_Type_Definition_Source: None
Attribute
Attribute_Label: REACH
Attribute_Definition: Indication of river reach
Attribute_Definition_Source: User Defined
Attribute_Domain_Values
Range_Domain
Range_Domain_Minimum: 1
Range_Domain_Maximum: 7
Attribute_Domain_Values
Codeset_Domain
Attribute_Code: 1
Definition: Mouth to Willamette Falls, 0-36
Attribute_Code: 2
Definition: Willamette Falls to Molalla Confluence, 37-50
Attribute_Code: 3
Definition: Mollalla Confluence to Newberg, 51-71
Attribute_Code: 4
Definition: Newberg to Salem, 72-110
Attribute_Code: 5
Definition: Salem to Albany, 111-151
Attribute_Code: 6
Definition: Albany to Harrisburg, 152-201
Attribute_Code: 7
Definition: Harrisburg to Middle Fork Confluence, 202-227
Attribute
Attribute_Label: CODE
Attribute_Definition: Channel type code
Attribute_Definition_Source: User Defined
Attribute_Domain_Values
Range_Domain
Range_Domain_Minimum: 1
Range_Domain_Maximum: 11
Attribute_Domain_Values
Codeset_Domain
Attribute_Code: 1
Definition: Main active channel.
Attribute_Code: 3
Definition: Sloughs, alcoves where one end is connected to main channel.
Attribute_Code: 5
Definition: Side or secondary channel. Both ends connect to main channel.
Attribute_Code: 6
Definition: Remnant river feature -- within known floodplain. Disconnected
floodplain lakes, sloughs. No apparent connection to main river,
but within historical floodplain area based flood extent coverage.
Attribute_Code: 7
Definition: Remnant river feature -- outside known floodplain. Disconnected
floodplain lakes, sloughs. No apparent connection to main river,
and outside historical floodplain area based flood extent coverage.
Attribute_Code: 10
Definition: Tributary to Willamette River.
Attribute_Code: 11
Definition: Islands.
Attribute
Attribute_Label: DESCRIPTION
Attribute_Definition: Associated place name or river feature
Attribute_Definition_Source: User Defined
DISTRIBUTION_INFORMATION
Distributor
Contact_Information
Contact_Organization: Oregon State University
Contact_Person: Doug Oetter
Contact_Position: Faculty Research Assistant
Contact_Address
Address_Type: mailing and physical address
Address: Dept. of Forest Science
Oregon State University
City: Corvallis
State_or_Province: OR
Postal_Code: 97331
Country: USA
Contact_Voice_Telephone: 541-737-8417
Contact_Facsimile_Telephone: 541-758-7760
Contact_Electronic_Mail_Address: oetter@fsl.orst.edu
Resource_Description:
AC1932P
Distribution_Liability:
While strong efforts are made to ensure data set accuracy,
complete accuracy of every data set cannot be guaranteed.
Standard_Order_Process
Digital_Form
Digital_Transfer_Information
Format_Name:Gzipped ARC/Info Interchange file
Digital_Transfer_Option
Online_Option
Computer_Contact_Information
Network_Address: ftp.fsl.orst.edu
Network_Resource_Name:
/pub/pnwerc/river/ac1932p.e00.gz
Access_Instructions: anonymous ftp
Fees: none
METADATA_REFERENCE_INFORMATION
Metadata_Date: 20000315
Metadata_Review_Date:
Metadata_Contact
Contact_Information
Contact_Organization: Oregon State University
Contact_Person: Doug Oetter
Contact_Position: Faculty Research Assistant
Contact_Address
Address_Type: mailing and physical address
Address: Dept. of Forest Science
Oregon State University
City: Corvallis
State_or_Province: OR
Postal_Code: 97331
Country: USA
Contact_Voice_Telephone: 541-737-8417
Contact_Facsimile_Telephone: 541-758-7760
Contact_Electronic_Mail_Address: oetter@fsl.orst.edu
Metadata_Standard_Name: FGDC CSDGM
Metadata_Standard_Version: 19940608