maine_t2_change_final.img

Identification Information

Citation Information

Title	maine_t2_change_final.img
Edition	First
Geospatial Data Presentation Form	raster digital data
Online Linkage	file://\\ann-svr-11\Vol1\current_projects\Maine\final_for_meta_Data\maine_t2_change_final.img

Abstract

This project resulted in the creation of raster data layers that document changes in the spatial pattern of commercial and residential development between two time periods in organized towns in Maine. This analysis was based primarily off leaf-off imagery from 2001-04 (T1) and leaf-on imagery collected in 2007 (T2) through the NAIP program (National Agriculture Imagery Program). Sanborn produced a yes/no “baseline” development raster from the 2001-04 imagery (T1), a yes/no “current” development raster from the 2007 imagery (T2), and a yes/no “new development between T1 and T2” raster. Sanborn classified the imagery for the 2001-04 baseline raster, the 2007 current raster, and the 2004-07 change in development raster and carried out a statistically valid accuracy assessment for the 2001-04 raster and the change analysis.

Purpose

This is a representation of the changed impervious surfaces meeting specific criteria within the state of Maine, between the time of the early-date imagery (circa 2001 - 2003) and the late-date imagery (2007), depending on the location within the state. It was created as part of a project designed to quantify change in development between T1, or early date, and T2, or late date.

Bounding Coordinates

West Bounding Coordinate	-71.189758
East Bounding Coordinate	-66.837988
North Bounding Coordinate	47.378344
South Bounding Coordinate	42.941087

Keywords

Place	Maine, USA (None)
Temporal	2001,2007 (None)

Contact Organization

Maine Dept of Inland Fisheries and Wildlife

Contact Person

Donald Katnik

Contact Position

WRAS Habitat Group Leader

Address Type

Unknown

Address

650 State Street

City

Bangor

State or Province

Maine

Postal Code

04401

Country

USA

Contact Voice Telephone

207-941-4455

Contact Facsimile Telephone

207-941-4450

Contact Electronic Mail Address

donald.katnik@maine.gov

Hours of Service

Monday - Friday 8:00am-4:00pm

Data Set Credit

State of Maine, Sanborn Map Company

Native Data Set Environment

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcGIS 10.0.2.3200

Process Description

T1 Impervious automated classification1.) All imagery not in UTM Zone 19N NAD 1983. Any imagery that was not in that projection system was reprojected to that system.2.) All T1 Imagery was resampled to 1 meter.3.) Imagery was divided up into 475 production areas. The production areas were created based on imagery type. There were 5 different imagery types for T1. The imagery types were 2003 2ft, 2003 1ft, 2004 2ft, 2003 1ft, 2001 6inch.4.) The imagery was mosaicked in to their respective production areas. 5.) Training models were created for each set of different imagery in Feature Analyst (Overwatch Geospatial). Once a model passed Quality Control checks, it was run on all imagery of the same vintage.6.) Each production area’s Feature Analyst output was reviewed and a new model was created as necessary to further improve the output.7.) Once a production area’s outputs were accepted, they were combined to make one file.8.) Minimum mapping unit for structures captured was 900 sq. ft.9.) Road types captured were paved roads, unpaved roads, driveways and logging roads.10.) Other features captured landfills, road in gravel pits and cemetery roads.T2 Impervious classification1.) All Imagery that was not in UTM Zone 19N NAD 1983 was reprojected to that system.2.) All T2 Imagery was resampled to 1 meter.3.) Imagery was mosaicked by type into the production areas created for the T1 imagery. There were 3 imagery types for T2, these were NAIP, 6inch 2006 York imagery and 6inch 2006 Columbine imagery. For editing purposes the 6inch imagery was used when available, otherwise NAIP was used.4.) The T2 was edited using manual heads-up methods.5.) Minimum mapping unit for structures captured was 900 sq. ft.6.) Road types captured were paved roads, unpaved roads, driveways and logging roads.7.) Other features captured landfills, road in gravel pits and cemetery roads.

Process Description

Editing Impervious datasets1.) An ArcMap document which was created by the state of Maine was used for all editing. The document contained a vector editing tool created by Maine to help edit missed buildings.2.) A raster version of the automated T1 impervious was contained in the document. A blank raster to add T2 change such as roads, driveway or features that could not be captured by the building tool was added in. Two vector files were added from a geodatabase, one for T1 edits and another for T2 edits.3.) The raster files were edited using the ArcScan Raster Paint tool. The vector files were edited using the tool that Maine created for editing buildings.4.) Once editing was complete data were reviewed to make sure that all T1 and T2 impervious was captured.

Process Description

Creation of Final Dataset1.) Once all impervious tiles were accepted, all T1 vector files were merged into a single vector file. The same was done with the T2 Change vector data.2.) A Field was then calculated in the T1 one and T2 change vector data with a value of 1.3.) Each file was converted to raster using Spatial Analyst.4.) The Edited T1 Raster files were mosaicked into one file using the mosaic tool in Erdas Imagine. The same was done for T2 raster data.5.) The Erdas mosaic tool was used to combine T1 raster data with the rasterized T1 vector data. This same process was used to combine the T2 raster data and the rasterized T2 vector data.6.) Once that was complete the output T1 combined dataset was combined with the T2 datasets using the Erdas mosaic tool. This created the 2007 Impervious dataset.7.) A model was written in ERDAS to subtract the T1 impervious from the 2007 T2 impervious dataset to create the change raster dataset.8.) Each dataset was subset by township using the shapefile towns_dissolved.shp as a template. This was done using the Erdas mosaic tool.

Direct Spatial Reference Method

Raster

Raster Object Type

Pixel

Row Count

490944

Column Count

328625

Map Projection Name

NAD 1983 UTM Zone 19N

Scale Factor at Central Meridian

Longitude of Central Meridian

Latitude of Projection Origin

False Easting

False Northing

Planar Coordinate Encoding Method

coordinate pair

Abscissa Resolution

0.000000002220024164500956

Ordinate Resolution

0.000000002220024164500956

Planar Distance Units

Meter

Horizontal Datum Name

D North American 1983

Ellipsoid Name

GRS 1980

Semi-major Axis

6378137.0

Denominator of Flattening Ratio

298.257222101

Entity Type Label

maine_t2_change_final.img.vat

Attribute Label

OID

Attribute Definition

Internal feature number.

Attribute Definition Source

ESRI

Unrepresentable Domain

Sequential unique whole numbers that are automatically generated.

Beginning Date of Attribute Values

Attribute Label

Value

Beginning Date of Attribute Values

Attribute Label

Count

Beginning Date of Attribute Values

Contact Organization

(MDIFW) Maine Dept of Inland Fisheries and Wildlife

Contact Person

Donald Katnik

Contact Position

Wildlife Biologist

Address Type

Unknown

Address

650 State Street

City

Bangor

State or Province

Maine

Postal Code

04401

Country

USA

Contact Voice Telephone

207 941-4455

Contact Facsimile Telephone

207 941-4450

Contact Electronic Mail Address

donald.katnik@maine.gov

Hours of Service

Monday - Friday 8:00am-4:00pm

Distribution Liability

See access and use constraints information.

Metadata Reference Information

Metadata Date

20110606

Metadata Contact

Contact Organization	Sanborn Map Company, Inc.
Address Type	Unknown
Address	320 Miller Ave., Suite 80
City	Ann Arbor
State or Province	MI
Postal Code	48103
Country	USA
Contact Voice Telephone	734.213.1060
Contact Facsimile Telephone	734.213.1085
Contact Electronic Mail Address	annarbor@sanborn.com
Hours of Service	M-F 9-5

Metadata Standard Name

FGDC Content Standard for Digital Geospatial Metadata

Metadata Standard Version

FGDC-STD-001-1998