imperv

Citation:

Citation Information:

Originator:
Maine Library of Geographic Information (MLGI), Maine Department of Environmental Protection (MEDEP), Maine Department of Inland Fisheries and Wildlife (MEIFW), Maine Department of Transportation (MEDOT), Maine Department of Health and Human Services, Drinking Water Program (MEDHHSDWP) and the Maine State Planning Office (MESPO) with the Maine GIS Executive Council (GISEC), U.S. Geological Survey (USGS), National Oceanographic and Atmospheric Administration (NOAA), Space Imaging (SI), and Sanborn
Publication Date: 20051018
Title: imperv
Geospatial Data Presentation Form: remote-sensing image
Series Information:

Series Name: Maine GIS
Issue Identification: SDE server; Internet Data Catalog

Publication Information:

Publication Place: Augusta ME
Publisher: Maine Office of Geographic Information Systems (MEGIS)

Other Citation Details: 1:24000
Online Linkage: http://megis.maine.gov/catalog/

Description:

Abstract:
IMPERV is a raster data set of impervious areas, derived from 5 meter SPOT imagery collected in the summer of 2004 over the State of Maine. IMPERV is part of a larger mapping initiative by the State of Maine to quantify land cover (MELCD) at a 5 meter resolution over the entire state.

Areas of imperviousness are characterized by anthropogenic features such as buildings, roads, parking lots, etc. Pixel values of 0 (zero) indicate an impervious land cover, while pixel values of 1 (one) indicate pervious land cover features.

Purpose: IMPERV quantifies impervious features at a 5 meter spatial resolution over the State of Maine.
Supplemental Information: A spread sheet IMPERV5M.xls distributed with IMPERV provides error assessment results based on the stratified random selection of 298, 25m2 validation samples.

Time Period of Content:

Time Period Information:

Single Date/Time:

Calendar Date: 5/1/2005
Time of Day: Unknown

Currentness Reference: publication date

Status:

Progress: Complete
Maintenance and Update Frequency: None planned

Spatial Domain:

Bounding Coordinates:

West Bounding Coordinate: -71.166741
East Bounding Coordinate: -66.849521
North Bounding Coordinate: 47.460073
South Bounding Coordinate: 42.970783

Keywords:

Theme:

Theme Keyword Thesaurus: Maine GIS Thesaurus-Theme
Theme Keyword: runoff
Theme Keyword: impervious area
Theme Keyword: urbanization
Theme Keyword: land use/land cover

Theme:

Theme Keyword Thesaurus: ISO Keyword Thesaurus
Theme Keyword: imageryBaseMapsEarthCover
Theme Keyword: environment

Place:

Place Keyword Thesaurus: Maine GIS Thesaurus-Place
Place Keyword: Maine
Place Keyword: USA

Stratum:

Stratum Keyword Thesaurus: GCMD Parameter Keyword
Stratum Keyword: land surface
Stratum Keyword: radiance or imagery

Access Constraints: None
Use Constraints:
Users must assume responsibility in determining the usability of this data for their purposes. Digital maps retain the accuracy of their source materials. The best use of data mapped at scales of 1:500,000 and 1:250,000 is in statewide planning and studies; at 1:100,000 in regional planning and studies; at 1:62,500 and 1:24,000 in detailed studies and local planning; and at 1:12,000 and 1:5,000 or larger scales in parcel level studies and detailed local planning. In the use of Maine GIS data, please check sources, scale, accuracy, currentness and other available information. Please confirm that you are using the correct copy of both data and metadata from the Maine GIS Data Catalog. The Maine Office of Geographic Information Systems (MEGIS) provides notice of updates and corrections directly to the Maine GIS Technical Group and to Maine GIS Users, through the MEGISTECH and MEGISUSER list servers. To subscribe please contact MeGIS through the Maine Office of Information Technology (OIT) Customer Support Center (CSC) at (207) 624-7700. To request correction of, or provide updates to Maine GIS data, please use the contact information contained in the metadata. Updates, corrections, and feedback, incorporated in the Maine GIS database are made in accordance with "Data Standards for Maine Geographic Information Systems", 2002 and coordinated by MEGIS in consultation with the Maine GIS Executive Council.
Point of Contact:

Contact Information:

Contact Organization Primary:

Contact Organization: Maine Department of Environmental Protection

Contact Position: Senior Database Analyst
Contact Address:

Address Type: mailing address
Address: SHS 17
City: Augusta
State or Province: ME
Postal Code: 04333
Country: USA

Contact Voice Telephone: (207)287-4292
Contact Facsimile Telephone: (207)287-7896

Data Set Credit: Credit should always be given to the data source and/or originator(s) when the data is transferred or printed.
Security Information:

Security Classification: Unclassified

Native Data Set Environment:
Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 9.0.0.535; Maine Office of Information Technology (OIT) Oracle 9i, Maine Office of Geographic Information Systems (MEGIS), Maine GIS SDE, SDEUSER, SDE.DEFAULT, Maine GIS Internet Data Catalog http://megis.maine.gov/catalog/

Attribute Accuracy:

Attribute Accuracy Report:
This data set was assessed based on the stratified random selection of 298, 25m2 validation samples. For a map at 90% accuracy using a 95% confidence level, the minimum number of sites required will be 298; with the map being rejected if more than 21 are misclassified. Each validation point was photo-interpreted by an analyst to determine its validation call (impervious or pervious) and to ensure that its entire area was a homogenous cover type. The cover type was determined by examining the SPOT imagery in conjunction with existing DOQQ imagery as further reference. A total of 16 validation points were deemed to be incorrect.
Quantitative Attribute Accuracy Assessment:

Attribute Accuracy Value: >= 90%
Attribute Accuracy Explanation:
Sanborn has developed an efficient procedure to assess accuracy of the impervious classification. The desired map accuracy is 90% for a MMU of 0.89 acres. Since we are working with a two-case situation where we only wish to know whether the classification is right or wrong, we can use a binomial distribution to calculate the sample size. Using this assumption, we can use Ginevan (1978) who illustrates a sampling method using stratified random points that satisfies three criteria:

o the scheme should have a low probability of accepting a map of low accuracy.
o it should have a high probability of accepting a map of high accuracy.
o it should require a minimum number of ground truth samples.


Using the look-up table given in the paper that presents the required sample size for a given minimum error and a desired level of confidence, we have determined a specific number of points that are required to meet the accuracy specification. For a map at 90% accuracy using a 95% confidence level (at 95%, we run the risk of a 1 in 20 chance that we reject a map that is actually correct), the minimum number of sites required will be 298; with the map being rejected if more than 21 are misclassified.

Completeness Report: Data set is complete for the State of Maine.
Positional Accuracy:

Horizontal Positional Accuracy:

Horizontal Positional Accuracy Report: The SPOT data source for IMPERV specifies a positional (horizontal) accuracy 12 meters or better with 90% confidence.
Quantitative Horizontal Positional Accuracy Assessment:

Horizontal Positional Accuracy Value: 12
Horizontal Positional Accuracy Explanation: Data was derived from digital data that meets or exceeds National Map Accuracy Standards for 1:24,000 scale.

Lineage:

Source Information:

Source Citation:

Citation Information:

Originator: SPOT Image, Corporation
Publication Date: 2004
Title: spot04
Geospatial Data Presentation Form: remote-sensing image
Series Information:

Series Name: Maine GIS
Issue Identification: SDE server

Publication Information:

Publication Place: Augusta ME
Publisher: Maine Office of Geographic Information Systems (MEGIS)

Online Linkage: \\CSU-EIA1PCGIS02\D$\melcd_data\spot5\tifadjust\107690_01.tif

Type of Source Media: online
Source Time Period of Content:

Time Period Information:

Single Date/Time:

Calendar Date: 2004
Time of Day: Unknown

Source Currentness Reference: ground condition

Source Citation Abbreviation: spot04
Source Contribution: IMPERV was derived from 5 meter SPOT imagery collected in the summer of 2004 over the State of Maine.

Process Step:

Process Description:
IMPERV was derived from 5 meter SPOT imagery collected in the summer of 2004 over the State of Maine. IMPERV is part of a larger mapping initiative by the State of Maine to quantify land cover at a 5 meter resolution over the entire state.
Areas of imperviousness are characterized by anthropogenic features such as buildings, roads, parking lots, etc. Pixel values of 1 (one) indicate a pervious land cover, while pixel values of 0 (zero) indicate impervious land cover features.

Process Date: 20050401
Process Contact:

Contact Information:

Contact Organization Primary:

Contact Organization: Sanborn

Contact Position: GIS / RS Analyst
Contact Address:

Address Type: mailing and physical address
Address: 455 E Eisenhower Parkway
City: Ann Arbor
State or Province: MI
Postal Code: 48108
Country: USA

Contact Voice Telephone: 734 213-1060
Contact Facsimile Telephone: 734 213-1085
Hours of Service: 0800 - 1600 (Monday - Friday) EST
Contact Instructions: Sanborn Solutions - www.sanborn.com

Process Step:

Process Description: Several coastal areas (mostly islands) which were missing partial or complete data updated. The South Bristol area was one of the fixes.
Process Date: 20051018
Process Contact:

Contact Information:

Contact Organization Primary:

Contact Organization: Maine Department of Environmental Protection

Contact Position: Senior Database Analyst
Contact Address:

Address Type: mailing address
Address: SHS 17
City: Augusta
State or Province: ME
Postal Code: 04333
Country: USA

Contact Voice Telephone: (207)287-4292
Contact Facsimile Telephone: (207)287-7896

Cloud Cover: 0

Direct Spatial Reference Method: Raster
Raster Object Information:

Raster Object Type: Pixel
Row Count: 99355
Column Count: 65102

Horizontal Coordinate System Definition:

Planar:

Grid Coordinate System:

Grid Coordinate System Name: Universal Transverse Mercator 1983
Universal Transverse Mercator:

UTM Zone Number: 19
Transverse Mercator:

Scale Factor at Central Meridian: 0.9996
Longitude of Central Meridian: -69
Latitude of Projection Origin: 0
False Easting: 500000
False Northing: 0

Planar Coordinate Information:

Planar Coordinate Encoding Method: Coordinate Pair
Coordinate Representation:

Abscissa Resolution: 5
Ordinate Resolution: 5

Planar Distance Units: meters

Geodetic Model:

Horizontal Datum Name: North American Datum of 1983
Ellipsoid Name: Geodetic Reference System 80
Semi-major Axis: 6378137
Denominator of Flattening Ratio: 298.257

Detailed Description:

Entity Type:

Entity Type Label: IMPERV
Entity Type Definition: value attribute table
Entity Type Definition Source: Environmental Systems Research Institute, Inc. (ESRI)

Overview Description:

Entity and Attribute Overview: IMPERV pixel values of 0 (zero) indicate an impervious land cover, while pixel values of 1 (one) indicate pervious land cover features.
Entity and Attribute Detail Citation:
The ArcView shapefile and ArcGIS geodatabase formats, commonly used for Maine GIS data, carry default identifiers and attributes that are software generated and/or important for internal recordkeeping. These are listed here to avoid repetition for every layer, and may not be repeated in the attribute descriptions and definitions of each layer. Common software generated identifiers and attributes in Maine GIS data include: FID (feature identifier), Shape (feature geometry), OBJECTID and SHAPE_lengt. In addition, most GIS formats will carry fields for PERIMETER, AREA and/or LENGTH according to feature geometry. These fields are typically available by default, with the units based on coordinate system or projection units of GIS data. Most GIS software packages also provide a means to calculate these values. It is important to test any columns containing PERIMETER, AREA or LENGTH values before using them for analysis purposes. These important values can be carried from format to format and become out-dated. Verify that the values are correct. Also, in your GIS software, please view the properties of data layers for the map units used to calculate these fields, and for the units set for display purposes.

Distributor:

Contact Information:

Contact Organization Primary:

Contact Organization: (MEGIS) Maine Office of Geographic Information Systems

Contact Position: GIS Coordinator
Contact Address:

Address Type: mailing address
Address: State House Station 145
City: Augusta
State or Province: ME
Postal Code: 04333-0145
Country: USA

Contact Voice Telephone: (207) 624-7700
Contact Facsimile Telephone: (207) 287-3842
Hours of Service: Monday through Friday 0800 - 1700 EST

Distribution Liability:
Users must assume responsibility to determine the usability of this data for their purposes. Although these data have been processed successfully on a computer system at the Maine Office of Geographic Information Systems, no warranty expressed or implied is made by MEGIS regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. Neither the Maine Office of Geographic Information Systems, nor any of its contributors, is liable for misuse of the data, for damage, for transmission of viruses, or for computer contamination through the distribution of these data sets.
Standard Order Process:

Digital Form:

Digital Transfer Information:

Format Name: ESRI Shapefile
Format Version Number: ARC Version 9.x
Format Specification: ArcView Shapefile Format
Format Information Content:
MEGIS has made all vector layers, in the Maine GIS Internet Data Catalog, available in ESRI's ArcView shapefile format. A shapefile is a simple non-topological format that stores the geometry and attribute information for a set of geographic features as a set of vector (point, line, polygon) coordinates. Shapefiles draw quickly and directly in ArcView, ArcGIS, ArcExplorer. Shapefiles are a compatible data type for many other types of GIS software. Three files are fundamental to each shapefile: .shp stores the feature geometry (shape and location information); .shx stores the index of the feature geometry; .dbf a dBASE (TM) file stores the attribute information for the features. Other index files may be created to help speed analysis and query: these file formats are .sbn .sbx .ain .aix .fbn and .fbx. In addition you may find projection .prj, and metadata .xml, files associated with shapefiles.
File Decompression Technique:
Data available from this website is in .zip compressed format. WinZip is a Windows based, PKZip-compatible compression utility. You will need a program like this to extract the data. A link to a trial copy WinZip software is available at http://megis.maine.gov/links/.
Digital Transfer Option:

Online Option:

Access Instructions:
These data are available to Internet browsers for download from the Maine GIS Internet Data Catalog. Data available from this website is in .zip compressed format. WinZip is a Windows based, PKZip-compatible compression utility. You will need a program like this to extract the data. A link to a trial copy WinZip software is available at http://megis.maine.gov/links/. If you are not already a GIS user, free software for viewing these files is available from Environmental Systems Research Institute, Inc. (ESRI). See http://megis.maine.gov/links/ for a link to ArcExplorer 9.x .
Digital Transfer Option:

Online Option:

Access Instructions: Where file size and Internet access permit, data requests can be made available via File Transfer Protocol (FTP).

Fees: Data may be downloaded from Maine GIS Internet Data Catalog at no charge.
Turnaround: Data is available for immediate download from the Maine GIS Internet Data Catalog.

Standard Order Process:

Distributor:

Contact Information:

Contact Organization Primary:

Contact Organization: (MEGIS) Maine Office of Geographic Information Systems

Contact Position: GIS Coordinator
Contact Address:

Address Type: mailing address
Address: State House Station 145
City: Augusta
State or Province: ME
Postal Code: 04333-0145
Country: USA

Contact Voice Telephone: (207) 624-7700
Contact Facsimile Telephone: (207) 287-3842
Hours of Service: Monday through Friday 0800 - 1700 EST

Resource Description: Downloadable Data
Distribution Liability:
Users must assume responsibility to determine the usability of this data for their purposes. Although these data have been processed successfully on a computer system at the Maine Office of Geographic Information Systems, no warranty expressed or implied is made by MEGIS regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. Neither the Maine Office of Geographic Information Systems, nor any of its contributors, is liable for misuse of the data, for damage, for transmission of viruses, or for computer contamination through the distribution of these data sets.
Standard Order Process:

Digital Form:

Digital Transfer Information:

Format Name: GeoTIFF
Format Specification: Tagged Image File Format
Format Information Content:
TIFF image format is in widespread use in the desktop publishing world. It serves as an interface to several scanners and graphic arts packages. TIFF supports black-and-white, grayscale, pseudo color, and true color images, all of which can be stored in a compressed or decompressed format. TIFF images may contain georeferencing information in header tags, or a .tfw file, defined by the GeoTIFF standard. ArcGIS currently supports GeoTIFF tags.
File Decompression Technique:
Data available from this website is in .zip compressed format. WinZip is a Windows based, PKZip-compatible compression utility. You will need a program like this to extract the data. A link to a trial copy WinZip software is available at http://megis.maine.gov/links/.
Digital Transfer Option:

Online Option:

Access Instructions:
These data are available to Internet browsers for download from the Maine GIS Internet Data Catalog. Data available from this website is in .zip compressed format. WinZip is a Windows based, PKZip-compatible compression utility. You will need a program like this to extract the data. A link to a trial copy WinZip software is available at http://megis.maine.gov/software.asp. If you are not already a GIS user, free software for viewing these files is available from Environmental Systems Research Institute, Inc. (ESRI). See http://megis.maine.gov/links/ for a link to ArcExplorer 9.x .
Digital Transfer Option:

Online Option:

Access Instructions: Where file size and Internet access permit, data requests can be made available via File Transfer Protocol (FTP).

Fees: Data may be downloaded from Maine GIS Internet Data Catalog at no charge.
Turnaround: Data is available for immediate download from the Maine GIS Internet Data Catalog.

Standard Order Process:

Available Time Period:

Time Period Information:

Range of Dates/Times:

Beginning Date: 11/11/2004
Beginning Time: Unknown
Ending Date: Present
Ending Time: Unknown

Distributor:

Contact Information:

Contact Organization Primary:

Contact Organization: (MEGIS) Maine Office of Geographic Information Systems

Contact Position: GIS Coordinator
Contact Address:

Address Type: mailing address
Address: State House Station 145
City: Augusta
State or Province: ME
Postal Code: 04333-0145
Country: USA

Contact Voice Telephone: (207) 624-7700
Contact Facsimile Telephone: (207) 287-3842
Hours of Service: Monday through Friday 0800 - 1700 EST

Distribution Liability: Users must assume responsibility to determine the usability of this data for their purposes.
Standard Order Process:

Digital Form:

Digital Transfer Information:

Format Name: ARCSDE
Format Version Number: ArcSDE 9.x
Format Information Content: Oracle 9i

Digital Transfer Option:

Online Option:

Access Instructions: Please contact the Maine Office of GIS (MEGIS) for access instructions.

Fees: Access is available through Maine's wide area network; WAN users may contact the Maine Office of Information Technology, Maine Office of Geographic Information Systems (MEGIS) for a login.

Metadata Date: 4/25/2005
Metadata Review Date: 9/25/2007
Metadata Future Review Date:
Metadata Contact:

Contact Information:

Contact Organization Primary:

Contact Organization: Sanborn

Contact Position: GIS / RS Analyst
Contact Address:

Address Type: mailing and physical address
Address: 455 E Eisenhower Parkway
City: Ann Arbor
State or Province: MI
Postal Code: 48108
Country: USA

Contact Voice Telephone: 734 213-1060
Contact Facsimile Telephone: 734 213-1085
Hours of Service: 0800 - 1600 (Monday - Friday) EST
Contact Instructions: Sanborn Solutions - www.sanborn.com

Metadata Standard Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata Standard Version: FGDC-STD-001-1998
Metadata Time Convention: local time
Metadata Extensions:

Online Linkage: http://www.esri.com/metadata/esriprof80.html
Profile Name: ESRI Metadata Profile