• Identification Information
• Data Quality Information
• Spatial Data Organization_Information
• Spatial Reference Information
• Entity and Attribute Information
• Distribution Information
• Metadata Reference Information

Identification Information:

Citation:

Citation Information:

Originator: New York State Adirondack Park Agency

Publication Date: 200012

Title of Data Set: 1950 Blowdown Areas of the Adirondack Park and Vicinity

Edition:

Presentation Form: map

Publication Information:

Publication Place: Ray Brook, New York State

Publisher: Adirondack Park Agency

Online Linkage:

Description:

Abstract: Spatial data containing areas damaged by a 1950 windstorm in and around the Adirondack Park, New York State.

Purpose: The spatial data layer was created for the Adirondack Park Agency (APA) as an historical reference. This resource may be used to determine the recent history of land use and major disturbances in the Adirondack Park.

Supplemental Information: The hardcopy map from which this digital data set was created is a creased paper blueprint developed by the New York State Conservation Department. According to the map, the areas of storm damage were determined from aerial reconnaissance data. The blueprint was drawn by the Forest General of the New York State Conservation Department, Gerald J. Rides. The scale bar indicates the map was drawn at a 1 inch = 4 miles scale. A legend appears at the bottom of the map with the following information:

25-50% Blowdown

50-100% Blowdown

County lines

Adirondack blueline

State land

The 25-50% Blowdown category polygons are indicated by a pale dashed outline. These lines are very faint in some instances. A digital Arc/Info interchange file containing a nearly complete representation of the 1950 Blowdown map was created by the staff from the Center for Remote Sensing at SUNY Plattsburg. The polygons on the original map were copied on to a cartographically correct 1:250,000 NYS DOT base map, then digitized. The classification and corresponding original Blowdown category for the features were as follows:

SUNY Plattsburg Code	1950 Blowdown Map
5%	50-100% Blowdown
6%	25-50% Blowdown
7%	N/A (internal polygon)

On November 25, 1950, a major windstorm caused significant damage in the western and central sections of the Adirondack Park.

Reference: McMartin, Barbara. 1994. The Great Forest of the Adirondacks. North Country Books, Utica, NY.

Scale: 1:253440

Time Period of Content:

Time Period Information:

Beginning Date: 1950

Ending Date: 1994

Currentness Reference: ground condition

Status:

Progress: Complete

Maintenance and Update Frequency: None Planned

Spatial Domain:

Bounding Coordinates:

West Bounding Coordinate: -75.916543

East Bounding Coordinate: -73.506364

North Bounding Coordinate: 44.707158

South Bounding Coordinate: 43.099025

Keywords:

Theme:

Theme Keyword Reference: NYS GIS Clearinghouse categories

Theme Keyword: forests

Theme:

Theme Keyword Thesaurus: None

Theme Keyword: windstorm

Theme Keyword: 1950 blowdown

Theme Keyword: disturbance

Place:

Place Keyword Thesaurus: None

Place Keyword: Adirondack Park, New York State

Access Constraints: Data is available from the Adirondack Park Agency



Use Constraints: Data is to be used at the scale intended.



Point of Contact:

Contact Information:

Contact Organization Primary:

Contact Organization: Adirondack Park Agency

Contact Person Primary:

Contact Person: John W. Barge

Contact Address:

Address Type: Mailing Address

Address: P.O. Box 99, Route 86

City: Ray Brook

State or Province: New York

Postal Code: 12977

Contact Voice Telephone: 518-891-4050

Contact Fascimile: 518-891-3938

Contact Electronic Mail Address:john.barge@apa.ny.gov

Native Data Set Environment: Windows NT, ARC/INFO version 8.0, 2.7 MB

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Data Quality Information:

Attribute Accuracy Report:

Logical Consistency Report: Topologically Clean

Completeness Report: Topological and attribute accuracy was verified by visually comparing the data overlaid upon the data in Arc/Info ArcPlot.

Positional Accuracy:

Horizontal Positional Accuracy Report:

Quantitative Horizontal Positional Accuracy Assessment:

Horizontal Positional Accuracy Value:

Horizontal Positional Accuracy Explanation:

Process Description: Applied GIS, Inc. processing steps: Intersections of county boundaries on the original hardcopy map were used to generate a tic file of UTM coordinates. A total of four tic marks were included in the file. This file was used to register hardcopy map. Digitizing of ten polygons missing from the SUNY Plattsburg digital coverage was completed on a Calcomp 9500 digitizing tablet. The RMS registration error was 0.013. This coverage was built with the POLY option. Next, the arcs were added to the existing 1950 Blowdown coverage using the GET command in ArcEdit. Label points were added to each of the new polygons, and values for the "Percent" item were entered. The composite coverage was then built with the POLY option. The PROJECT command was used to change the projection from UTM NAD 27 to UTM NAD 83. A look-up table called blowdn.lut was created to cross-reference to the original legend categories. The list below indicates the description associated with each code:

PERCENT	ORIGINAL DESCRIPTION
5	50 to 100% Blowdown
6	25 to 50% Blowdown
7	None (Internal Polygon)

The look-up table was compressed into an interchange file called blow lut.e00. The final data set was converted into an Arc/Info interchange filed named blow50.e00 for easy data transfer.

Applied GIS, Inc. QA/QC analysis: Quality Assurance/Quality Control was determined by a series of tests. The final coverage was visually inspected interactively through comparison to the source material (the hardcopy map). The data set was thematically mapped by "Percent" and printed at the same scale as the source material. The printed check plot was positioned next to the original hardcopy map for cross-examination. The operator checked for consistency between the source material and the final coverage in terms of coding and position of graphic objects and attributes (fields and content). The geographic extent was confirmed by zooming to the full extent to identify potential outliers located beyond the range displayed on the original hardcopy map. Objects with extreme area size (small or large) were identified in ArcView by sorting the attribute table by area. Small slivers and unusually large polygons were examined. The accuracy of the type of attribute fields was verified by examining the Arc/Info Items listing. Creating a summary table in ArcView confirmed valid attribute values. The coordinate system of the final data set was verified by examining the coverage description in Arc/Info, as well as overlaying the data over a coverage known to be in the desired projection. Consistency between the known coverage and the 1950 Blowdown layer was evaluated.

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Spatial Data Organization Information:

Direct Spatial Reference Method: Vector

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Spatial Reference Information:

Horizontal Coordinate System Definition:

Geographic: Universal Transverse Mercator (UTM)

UTM Zone: 18

Geodetic Model:

Horizontal Datum: North American Datum of 1983

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Entity and Attribute Information:

Overview Description:

Entity and Attribute Overview:



Attribute Name	Description	Attribute Type	Input Width	Output Width	Decimal Places
Area	Area of the polygon	Floating Point	4	12	3
Perimeter	Perimeter of the polygon	Floating Point	4	12	3
Blow50#	Internal ID number of the polygon	Binary	4	5	0
Blow50-ID	User ID number of the polygon	Binary	4	5	0
Percent	Percentage blow down	Integer	1	1	0

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Distribution Information:

Distributor:

Contact Information:

Contact Organization Primary:

Contact Organization: New York State Adirondack Park Agency

Contact Person Primary:

Contact Person: John W. Barge

Contact Address:

Address Type: Mailing Address

Address: P.O. Box 99, Route 86

City: Ray Brook

State or Province: New York

Postal Code: 12977

Contact Voice Telephone: 518-891-4050

Contact Fascimile Telephone: 518-891-3938

Contact Electronic Mail Address:john.barge@apa.ny.gov

Distribution Liability:

Standard Order Process:

Digital Form:

Digital Transfer Information:

Format Name: ARCE

Digital Transfer Option:

Online Option:

Computer Contact Information:

Network Address:

Network Resource Name:

Fees: None