T-1557a; Sheet No. 5, Hood’s Canal, Dabop and Quilcene Bays, Washington Territory, 1883

Metadata:


Identification_Information:

Citation:

Citation_Information:

Originator:  Point No Point Treaty Council

Originator:  7999 NE Salish Lane, Kingston, WA 98346 USA

Publication_Date: 10/01/03

Title: T-1557a; Sheet No. 5, Hood’s Canal, Dabop and Quilcene Bays, Washington Territory, 1883

Geospatial_Data_Presentation_Form: map

Abstract:

Georeferenced United States Coast & Geodetic Survey Topographic Sheet T-1557a; Sheet No. 5, Hood’s Canal, Dabop and Quilcene Bays, Washington Territory, 1883; Scale: 1:10,000; Surveyor: J. J. Gilbert

Supplemental_Information:  For a comprehensive historical and technical review of the production and interpretation of early Coast & Geodetic Survey T-sheets please refer to Shalowitz, A.L. 1964. Shore and Sea Boundaries, Volumes 2.  U.S. Department of Commerce, U.S. Coast and Geodetic Survey, Washington, DC. This publication is available online at http://chartmaker.ncd.noaa.gov/hsd/shallow.htm

Time_Period_of_Content:  1883

Time_Period_Information:  1883

Single_Date/Time:

Calendar_Date: 1883

Currentness_Reference: 1883

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Keywords:

Theme:

Theme_Keyword: T-sheets

Theme_Keyword: Coastal Survey

Theme_Keyword: Land Cover

Theme_Keyword: Historical

Theme_Keyword: United States Coast and Geodetic Survey

Place:

Place_Keyword: Washington State

Place_Keyword: Puget Sound

Stratum:

Stratum_Keyword: Near Shore

Stratum_Keyword: Coast

Temporal:

Temporal_Keyword: 1883

Access_Constraints:

This georeferenced image may be freely downloaded and used. Please give credit to the Puget Sound River History Project, University of Washington.

http://riverhistory.ess.washington.edu

Use_Constraints:

This georeferenced image may be freely downloaded and used. Please give credit to the Puget Sound River History Project, University of Washington.

http://riverhistory.ess.washington.edu

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Alan Carter Mortimer

Contact_Organization:

Point No Point Treaty Council

Contact_Address:

Address_Type: mailing address

Address: 7999 NE Salish Lane

City: Kingston

State_or_Province: WA

Postal_Code: 98346

Country: USA

Contact_Voice_Telephone: (360) 297-6530

Contact_Facsimile_Telephone: (360) 297-3413

Contact_Electronic_Mail_Address: alancm@pnptc.org

 


Data_Quality_Information:

Positional_Accuracy:

Horizontal_Positional_Accuracy: 3 meters (using four reliable benchmarks)

 

This t-sheet covers the bays in Northern Hood Canal, and the original image is a bitmap.  The coastline matches fairly well, with some discrepancies compared to the DRG, but these could be due to landscape changes.  The sheet has excellent detail and good edge matching with T1557b.

 

To assess an independent check of the accuracy of the registration process, benchmarks located on the T-sheets were compared to published NGS benchmarks that were retraceable to the time of the surveyed T-sheet. (Published NGS benchmark information is located at http://www.ngs.noaa.gov/cgi-bin/datasheet.prl). Only benchmarks that could be established with a high degree of certainty that existed at the time of the original T-sheet survey and were not remounted were used in the final accuracy measurement. If no current benchmarks exist or if the benchmarks have been remounted in relation to the benchmarks on the T-sheet, hard points (areas that would expect little change since the original surveys) were used to give a general indicator of the T-sheet’s registration accuracy in lieu of a more rigorous method. Thus these hard point measurements must be viewed with some caution. It should be stressed that the accuracy assessment was to check the accuracy of the overall registration process, not necessarily the accuracy of the survey itself.

 

NOTE: Measured distances are rounded to the nearest meter. The hand-drawn representations of benchmarks on the T-sheets are often up to 10 meters in width. To assess an independent check of the accuracy of the registration process, the measured distance is from the NGS-published coordinates to the perceived middle of the benchmark depicted on the T-sheet. In addition, the overall shape of the benchmark symbol is sometimes obscured by other symbology on the T-sheet. Thus, there is a certain level of uncertainty introduced due to the ambiguous location of the benchmark on the T-sheet. 

 

Horizontal_Positional_Accuracy_Report:

            Four benchmarks on map can be traced continuously through historical record, giving an average positional error of 3 meters.

 

Station Name

PID

Latitude

Longitude

BEND 1878

SY5546

47 48 09.01025

122 52 03.55817

MARSH 1878

SY5558

47 49 15.53895

122 51 38.14397

BROAD SPIT 1878

SY5562

47 48 37.22951

122 48 57.66821

LONG SPIT 1878

SY5571

47 50 13.14776

122 48 25.71010

 

 

Lineage:

Technician: Alan Carter Mortimer

Date:  11-10-03

Process_Step:

Process_Description:  The georeferencing of T-sheets in the Puget Sound region was funded by the Puget Sound Nearshore Project (PSNERP) http://www.pugetsoundnearshore.org/

This T-Sheet was scanned by University of Washington Facility Records at 400 DPI 1-bit from a Mylar print located at the University of Washington Map Collection (http://www.lib.washington.edu/maps/historicnauts.html).  This source was used when high-resolution grayscale scans of the original T-Sheets were not available.

 

T-Sheets in the Hood Canal and Strait of Juan de Fuca vicinity were processed by Point No Point Treaty Council (http://www.pnptc.org/) for this project.

 

The methodology used to georeference the T-sheets was modified from the previous work of Jennifer Burke (NOAA) in the Lower Columbia and Daniels et al (2001). The georeferencing and error assessment process were carried out using ArcGIS 8.3. For additional information concerning the georeferencing method please refer to: http://rocky2.ess.washington.edu/riverhistory/tsheets.php

 

Datum Shift:

 

Most T-sheets do not have a current datum represented on them (i.e. NAD 27, NAD 83). Graticules (tics) marking Latitude and Longitude in the early local Puget Sound Datum (PSD) and a later update to North American Datum (NAD) projection are most often present. To calculate the X, Y shift from NAD to NAD 27, X and Y values were used from datum difference tables for survey stations around most of Puget Sound (Patton, 1999). An overall datum shift was determined for the area covered by the T-sheet by averaging the shift from a number of survey stations in or nearby that area represented on the T-sheet.

 

The following survey stations were used to calculate the datum shift:

 

BEND 1878

BROAD SPIT 1878

CEDAR 1878

FISHERY 1878

GRASS 1878

LAKE 1878

LONG SPIT 1878

MARSH 1878

PENINSULA 1878

QUILCENE 1878

TONGUE 1878

TULE 1878

 

            Registration:

 

For georeferencing, tics were used only surrounding areas that depicted nearshore features on the T-sheet. This was mainly done to hasten the overall process due to the magnitude of the scope of the project while maintaining the best control around areas of interest. The sheets were then rectified using a 1st order polynomial transformation. Points that produced relatively high RMS values, as well as tic points that consistently fell outside of 4.5 meters (on a 1:10,000 scale T-sheet) of their projected UTM coordinates were omitted.

 

            The following tic marks were used for georeferencing the initial resample:

 

ID

Latitude

 

Longitude

 

1

47

48

122

47

2

47

48

122

48

3

47

48

122

49

4

47

48

122

50

5

47

48

122

51

6

47

48

122

52

7

47

48

122

53

8

47

49

122

47

9

47

49

122

48

10

47

49

122

49

11

47

49

122

50

12

47

49

122

51

13

47

49

122

52

14

47

49

122

53

15

47

50

122

47

16

47

50

122

48

17

47

50

122

49

18

47

50

122

50

19

47

50

122

51

20

47

50

122

52

21

47

50

122

53

22

47

51

122

47

23

47

51

122

48

24

47

51

122

49

25

47

51

122

50

26

47

51

122

51

27

47

51

122

52

28

47

52

122

48

29

47

52

122

49

 

Point 8 was eliminated due to inability to identify graticule point on image.  Then one resample was performed, which had an RMS of 1.89476 and low benchmark error.

 

 

Several factors that can introduce error into the registration process include:

 

 

 

 

 

 

 

 

References:

 

 Daniels, R. C. and R.H. Huxford. 2001. An error assessment of vector data derived from scanned National Ocean Service topographic sheets. Journal of Coastal Research 17: 611 – 619.

 

Patton, R.S., 1999. Datum Differences: Atlantic, Gulf, and Pacific Coast of the United States. U.S. Department of Commerce, U.S. Coast and Geodetic Survey, Washington D.C. (Original publication: 1936)

 

 


Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Grid_Coordinate_System:

Grid_Coordinate_System_Name: Universal Transverse Mercator

Universal_Transverse_Mercator:

UTM_Zone_Number: 10

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.999600

Longitude_of_Central_Meridian: -123.000000

Latitude_of_Projection_Origin: 0.000000

False_Easting: 500000.000000

False_Northing: 0.000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: row and column

Coordinate_Representation:

Abscissa_Resolution: 3.000000

Ordinate_Resolution: 3.000000

Planar_Distance_Units: meters

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:

Resource_Description: Downloadable Data

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:


Metadata_Reference_Information:

Metadata_Date: 20020723

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Brian Collins, Amir Sheikh

Contact_Organization:

Department of Earth and Space Sciences, University of Washington

Contact_Address:

Address_Type: mailing address

Address: Department of Earth and Space Sciences

Address: Box 351310

Address: University of Washington

City: Seattle

State_or_Province: WA

Postal_Code: 98195

Country: USA

Contact_Voice_Telephone: (206) 616-6584

Contact_Facsimile_Telephone: (206) 543-0489

Contact_Electronic_Mail_Address: bcollins@u.washington.edu

Contact_Electronic_Mail_Address: asheikh@u.washington.edu

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time