Skykomish River, 1938 aerial photos

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Puget Sound River History Project, University of Washington.
Publication_Date: 2007
Title: Skykomish River, 1938 aerial photos
Geospatial_Data_Presentation_Form: remote-sensing image
Description:
Abstract:
This dataset is part of a collection of historical aerial photographs of Puget Sound rivers that were orthorectified. The photos were recieved in paper format from the Army Corps of Engineers. This image dataset was created from individual scanned aerial photos (stored in TIFF format) which were orthorectified, mosaicked, and tiled based on Washington section boundaries. Data does not necessarily fill each section completely.
Purpose:
Historical mapping of river channel migration of the Skykomish River in Snohomish County, Washington, USA.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1938
Time_of_Day: unknown
Currentness_Reference: 1938
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -122.103754
East_Bounding_Coordinate: -121.454907
North_Bounding_Coordinate: 47.954492
South_Bounding_Coordinate: 47.772478
Keywords:
Theme:
Theme_Keyword_Thesaurus:
REQUIRED: Reference to a formally registered thesaurus or a similar authoritative source of theme keywords.
Theme_Keyword: Skykomish River
Theme_Keyword: Channel Migration
Theme_Keyword: Puget Sound Rivers
Theme_Keyword: hydrology
Theme_Keyword: Aerial Photographs
Theme_Keyword: Historical Puget Sound Rivers Photographs
Theme_Keyword: Rivers
Theme_Keyword: River History
Place:
Place_Keyword: Snohomish County
Place_Keyword: Washington
Place_Keyword: United States
Place_Keyword: Puget Sound
Temporal:
Temporal_Keyword: 1938
Access_Constraints:
This data may be freely downloaded and used. Please give credit to Snohomish County Public Works and to the Puget Sound River History Project, University of Washington.
Use_Constraints:
This data may be freely downloaded and used. Please give credit to Snohomish County Public Works and to the Puget Sound River History Project, University of Washington.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Brian Collins
Contact_Organization: University of Washington
Data_Set_Credit: The Puget Sound River History Project, University of Washington
Security_Information:
Security_Classification: Unclassified
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.780
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
This photo set, while being too old to have camera calibration information available, had very good overlap from photo to photo so the control is very good.

The amX, amY, and amZ values in the Positional Accuracy section represent the average mean square error for the X, Y, and Z coordinates of the control and tie points (in meters).

Completeness_Report:
Images cover the river bottoms and some of the adjacent uplands for the Skykomish River from approximately RM 23 to the Canyon Falls area on the South Fork past the confluence of the North and South Forks.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Average mean square error for the X and Y coordinates of the control and tie points, from the Leica Photogrammetry SuiteTriangulation Report (measured in meters):

Photos 1 through 24: amX: 0.6227 amY: 0.8299

Photos 26 through 67: amX: 0.9732 amY: 1.2672

Quantitative_Horizontal_Positional_Accuracy_Assessment:
Horizontal_Positional_Accuracy_Explanation: See: <https://gis.ess.washinghton.edu/data/erdas_pdfs/LPS_PM.pdf>
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
Average mean square error for the Z coordinates of the control and tie points, from the Leica Photogrammetry SuiteTriangulation Report (measured in meters):

Photos 1 through 24: amZ: 4.0754

Photos 26 through 67: amZ: 5.5285

Quantitative_Vertical_Positional_Accuracy_Assessment:
Vertical_Positional_Accuracy_Explanation: See: <https://gis.ess.washinghton.edu/data/erdas_pdfs/LPS_PM.pdf>
Lineage:
Source_Information:
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1938
Source_Currentness_Reference: ground condition
Process_Step:
Process_Description:
Black and white photographs were scanned (some at a robust 600 and some at a rather less than ideal 300 pixels per inch) and saved as TIFF files. Performed "Auto Levels" in Photoshop and used Photoshop to change all pixels of value 0,0,0 to 1,1,1 (to avoid dropout of 0,0,0 pixels when turning off display of background value 0 in ArcMap). Resulting TIFF images were then orthorectified using Leica Photogrammetry Suite (formerly ERDAS Imagine's OrthoBASE module). Registration sources were USGS orthophotos (<https://wagda.lib.washington.edu/data/type/photography/snohomish/>), USDA NAIP images (<https://gis.ess.washington.edu/data/raster/doqs_naip.html>), USGS Digital Ortho Quarter-quads (<https://gis.ess.washington.edu/data/raster/doqs/>), and a USGS 10-meter DEM (<https://gis.ess.washington.edu/data/raster/tenmeter/byquad/>).
Process_Date: 2007
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Charles Kiblinger
Contact_Organization: University of Washington
Contact_Position: GIS Analyst
Contact_Voice_Telephone: 206.685.7981
Contact_Electronic_Mail_Address: cek@u.washington.edu
Cloud_Cover: None
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Pixel
Row_Count: 5454
Column_Count: 5331
Vertical_Count: 1
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Lambert Conformal Conic
Lambert_Conformal_Conic:
Standard_Parallel: 47.500000
Standard_Parallel: 48.733333
Longitude_of_Central_Meridian: -120.833333
Latitude_of_Projection_Origin: 47.000000
False_Easting: 1640416.666667
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 1.000000
Ordinate_Resolution: 1.000000
Planar_Distance_Units: survey feet
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: University of Washington
Resource_Description: Downloadable Data
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Transfer_Size: 0.000
Ordering_Instructions: See: <https://riverhistory.ess.washington.edu/>
Metadata_Reference_Information:
Metadata_Date: 20070730
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Brian Collins
Contact_Organization: University of Washington
Contact_Address:
Address_Type:
REQUIRED: The mailing and/or physical address for the organization or individual.
City: REQUIRED: The city of the address.
State_or_Province: REQUIRED: The state or province of the address.
Postal_Code: REQUIRED: The ZIP or other postal code of the address.
Contact_Voice_Telephone: 206.685.7981
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: None.
Metadata_Extensions:
Online_Linkage: <https://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile
Generated by mp version 2.8.6 on Mon Jul 30 16:49:03 2007