USGS 2001 National Land Cover

SDE Raster Dataset

Tags
SD, ND, Montana, US, Base Maps, USGS, South Dakota, Earth Cover, Land Cover, digital spatial data, GIS, zone 30, United States, North Dakota, MT, U.S., imagery, U.S. Geological Survey

Description

The National Land Cover Database 2001 land cover layer for mapping zone 30 was produced through a cooperative project conducted by the Multi-Resolution Land Characteristics (MRLC) Consortium. The MRLC Consortium is a partnership of federal agencies (www.mrlc.gov), consisting of the U.S. Geological Survey (USGS), the National Oceanic and Atmospheric Administration (NOAA), the U.S. Environmental Protection Agency (EPA), the U.S. Department of Agriculture (USDA), the U.S. Forest Service (USFS), the National Park Service (NPS), the U.S. Fish and Wildlife Service (FWS), the Bureau of Land Management (BLM) and the USDA Natural Resources Conservation Service (NRCS). One of the primary goals of the project is to generate a current, consistent, seamless, and accurate National Land cover Database (NLCD) circa 2001 for the United States at medium spatial resolution. This landcover map and all documents pertaining to it are considered "provisional" until a formal accuracy assessment can be conducted. For a detailed definition and discussion on MRLC and the NLCD 2001 products, refer to Homer et al. (2004) and http://www.mrlc.gov/mrlc2k.asp. The NLCD 2001 is created by partitioning the U.S. into mapping zones. A total of 66 mapping zones were delineated within the conterminous U.S. based on ecoregion and geographical characteristics, edge matching features and the size requirement of Landsat mosaics. Mapping zone 30 encompasses whole or portions of several states, including the states of Montana, North Dakota, and South Dakota. Questions about the NLCD mapping zone 30 can be directed to the NLCD 2001 land cover mapping team at the USGS/EROS, Sioux Falls, SD (605) 594-6151 or mrlc@usgs.gov.

Summary

The goal of this project is to provide the Nation with complete, current and consistent public domain information on its land use and land cover.

Credits

U.S. Geological Survey, Rocky Mountain Geographic Science Center (RMGSC)

Use limitations

Scale Range

Metadata 

Topics and Keywords 

Themes or categories of the resource  imageryBaseMapsEarthCover


Place keywords  US, United States, U.S.

Thesaurus
Title U.S. Department of Commerce, 1995, Countries, dependencies, areas of special sovereignty, and their principal administrative divisions, Federal Information Processing Standard 10-4,): Washington, D.C., National Institute of Standards and Technology




Place keywords  SD, ND, Montana, South Dakota, North Dakota, MT

Thesaurus
Title U.S. Department of Commerce, 1987, Codes for the identification of the States, the District of Columbia and the outlying areas of the United States, and associated areas (Federal Information Processing Standard 5-2): Washington, D.C., National Institute of Standards and Technology




Place keywords  zone 30

Theme keywords  Base Maps, Earth Cover, imagery

Thesaurus
Title ISO 19115 Category




Theme keywords  USGS, Land Cover, digital spatial data, GIS, U.S. Geological Survey

Citation 

Title USGS 2001 National Land Cover
Publication date 2003-09-01


Edition 1.0


Presentation formats* digital table


Series
Name None
Issue None

Other citation details
References: Homer, C., C. Huang, L. Yang, B. Wylie and M. Coan, 2004. Development of a 2001 national land cover database for the United States. Photogrammetric Engineering and Remote Sensing Vol.70,No.7,pp 829-840 or online at www.mrlc.gov/publications. The USGS acknowledges the support of Rocky Mountain Geographic Science Center (RMGSC), NLCD Land Cover Team in development of data in this zone.



Citation Contacts 

Responsible party
Organization's name U.S. Geological Survey
Contact's role  publisher


Contact information
Address
Delivery point Sioux Falls, SD



Responsible party
Organization's name U.S. Geological Survey
Contact's role  originator


Resource Details 

Dataset languages  English (UNITED STATES)


Status  under development
Spatial representation type* grid


Supplemental information
*Processing environment Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.3.1.4959


Credits
U.S. Geological Survey, Rocky Mountain Geographic Science Center (RMGSC)

*Name NDHUB.LANDCLASS_NLC_2001

Extents 

Extent
Description
ground condition

Temporal extent
Beginning date 1999-09-17
Ending date 2003-08-19

Extent
Geographic extent
Bounding rectangle
Extent type  Extent used for searching
*West longitude -104.449627
*East longitude -96.390348
*North latitude 49.256576
*South latitude 45.692556
*Extent contains the resource Yes

Extent in the item's coordinate system
*West longitude 102507.647000
*East longitude 689997.647000
*South latitude 5072578.810000
*North latitude 5455978.810000
*Extent contains the resource Yes

Resource Points of Contact 

Point of contact
Organization's name U.S. Geological Survey
Contact's position Customer Services Representative
Contact's role  point of contact


Contact information
Phone
Voice 605/594-6151
TDD/TTY 605/594-6933
Fax 605/594-6589

Address
Type both
Delivery point 47914 252nd Street
Delivery point USGS/EROS
City Sioux Falls
Administrative area SD
Postal code 57198-0001
Country US
e-mail addresscustserv@usgs.gov

Hours of service
0800 - 1600 CT, M - F (-6h CST/-5h CDT GMT)

Contact instructions
The USGS point of contact is for questions relating to the data display and download from this web site. For questions regarding data content and quality, refer to: http://www.mrlc.gov/mrlc2k.asp or email: mrlc@usgs.gov



Resource Maintenance 

Resource maintenance
Update frequency  as needed


Resource Constraints 

Legal constraints
Limitations of use
Although these data have been processed successfully on a computer system at the USGS, no warranty expressed or implied is made by the USGS regarding the use of the data on any other system, nor does the act of distribution constitute any such warranty. Data may have been compiled from various outside sources. Spatial information may not meet National Map Accuracy Standards. This information may be updated without notification. The USGS shall not be liable for any activity involving these data, installation, fitness of the data for a particular purpose, its use, or analyses results.

Security constraints
Classification  unclassified
Classification system None


Additional restrictions
N/A



Spatial Reference 

ArcGIS coordinate system
*Type Projected
*Geographic coordinate reference GCS_North_American_1983
*Projection NAD_1983_UTM_Zone_14N
*Coordinate reference details
Projected coordinate system
Well-known identifier 26914
X origin -5120900
Y origin -9998100
XY scale 450445547.3910538
Z origin 0
Z scale 1
M origin 0
M scale 1
XY tolerance 0.001
Z tolerance 2
M tolerance 2
High precision true
Latest well-known identifier 26914
Well-known text PROJCS["NAD_1983_UTM_Zone_14N", GEOGCS["GCS_North_American_1983", DATUM["D_North_American_1983", SPHEROID["GRS_1980", 6378137.0, 298.257222101]], PRIMEM["Greenwich", 0.0], UNIT["Degree", 0.0174532925199433]], PROJECTION["Transverse_Mercator"], PARAMETER["False_Easting", 500000.0], PARAMETER["False_Northing", 0.0], PARAMETER["Central_Meridian", -99.0], PARAMETER["Scale_Factor", 0.9996], PARAMETER["Latitude_Of_Origin", 0.0], UNIT["Meter", 1.0], AUTHORITY["EPSG", 26914]]

Reference system identifier
*Value 26914
*Codespace EPSG
*Version 8.6.2


Data Quality 

Scope of quality information
Resource level  dataset




Data quality report - Conceptual consistency
Measure description
The NLCD 2001 database for mapping zone 30 consists of three main data products including: (1) per pixel classified land-cover data (2) sub-pixel percent imperviousness and (3) sub-pixel percent tree canopy density. The land-cover database also includes three additional metadata layers that provide users a spatial node map of the land cover classification. The three layers are: (a) a spatial node map of the land cover classification, (b) a spatial confidence map of the land cover classification, and, (c) a text file of logical statements related to the land cover classification. Conceptually, the descriptive tree is a classification tree generated by using the final minimum-map- unit land cover product (1 acre) as training data, and Landsat and other ancillary data as predictors. The goal of the descriptive tree is to summarize the effects of boosted trees (10 sequential classification trees) into a single condensed decision tree that can be used as a diagnostic tool for the classification process. This descriptive tree can be used to assess the relative importance of each of the input data sets on each land cover class. Such information may also be useful to customize the minimum-mapping-unit classification to meet a user's specific needs through raster modeling. Descriptive trees usually capture 60 to 80% of the information from the original land cover data. The leaf or terminal nodes of the descriptive tree are assigned to sequential numbers (called node numbers) and mapped across the entire mapping zone on a pixel-by-pixel basis. These node numbers can then be matched with the various conditional statements associated with each respective terminal node. This spatial layer appears similar to a cluster map, but is the result of a supervised classification - not an unsupervised clustering. This node map can potentially be used as input by users to customize NLCD land cover, by linking the spatial extent of an individual node with the rules of the conditional statement. The Land Cover spatial classification confidence data layer is provided to users to help determine the per-pixel spatial confidence of the NLCD 2001 land cover prediction from the descriptive tree. The C5 algorithm produces an estimate (a value between 0% and 100%) that indicates the confidence of rule predictions at each node based on the training data. This spatial confidence map should be considered as only one indicator of relative reliability of the land cover classification, rather than a precise estimate. Users should be aware that this estimate is made based on only training data, and is derived from a generalized descriptive decision tree that reproduces the final land cover data. However, this layer provides valuable insight for a user to determine the risk or confidence they choose to place in each pixel of land cover. A logic statement from a descriptive tree classification describes each classification rule for each classified pixel. An example of the logic statement follows: IF tasseled-cap wetness > 140 and imperviousness = 0 and canopy density < 4, then classify as Water This logic file can be used in combination with the spatial node map to identify classification logic and allow modifications of the classification based on user's knowledge and/or additional data sets. Additional information may be found at http://www.mrlc.gov/mrlc2k_nlcd.asp.





Data quality report - Completeness omission
Measure description
This NLCD product of mapping zone 30 Land Cover layer is the version dated 11/29/2006.





Data quality report - Quantitative attribute accuracy
Measure description
The information on data quality for mapping zone 30 was generated by the Decision Tree algorithm that conducts a cross-validation for assessing classification and prediction reliability. No formal independent accuracy assessment of mapping zone 30 land cover has been made. The regression tree algorithm employed in NLCD 2001 mapping offers a cross-validation option for assessing classification and prediction reliability. Cross-validation can provide relatively reliable estimates for land cover predictions if the reference data used for cross-validation are collected based on a statistically valid sampling design. For mapping zone 30 land cover modeling, a 5-fold cross-validation was conducted by dividing the entire training data set into 5 subsets of equal size. For each model run, an accuracy estimate was derived using one subset to evaluate the model prediction (with the model developed using the remaining training samples). This process was repeated 5 times. After all 5 runs, an average value of all accuracy estimates from the 5 runs were computed. Users should be cautioned that these cross-validation results provide users with only first-order estimates of data quality, and should not be considered a formal accuracy assessment. This landcover map and all documents pertaining to it are considered "provisional" until a formal accuracy assessment can be conducted.



Quantitative test results
Value 69.9


Evaluation method
The above listed value is the overall accuracy obtained for the land cover data using a cross-validation estimate from the decision tree model. This document and the described landcover map are considered "provisional" until a formal accuracy assessment is completed. The U.S. Geological Survey can make no guarantee as to the accuracy or completeness of this information, and it is provided with the understanding that it is not guaranteed to be correct or complete. Conclusions drawn from this information are the responsibility of the user.





Data quality report - Absolute external positional accuracy
Dimension horizontal


Measure description
N/A





Data quality report - Absolute external positional accuracy
Dimension vertical


Measure description
N/A





Lineage 

Process step
When the process occurred 2006-11-29
Description
The land cover classification was achieved by use of a classification and decision tree method (DT) using a combination of Landsat imagery and ancillary data. The specific DT program employed is called C5, which implements a gain ratio criterion in tree development and pruning (Quinlan, 1993). C5 also implemented several advanced features that can aid and improve land cover classification, including boosting and cross-validation. Boosting is a technique for improving classification accuracy, while cross-validation can provide certain level of estimation regarding the land cover classification quality. In addition, C5 can generate a confidence estimate for each classified pixel and record the associated classification logic in a text file that can be readily interpreted and incorporated into a metadata system. To conduct the land cover classification using DT, a large quantity of training data is required. For mapping zone 30, training data were collected from several combined sources including ancillary land cover maps such as USGS Multi-resolution Land Cover (MRLC) 1992 datasets for Montana, North Dakota, and South Dakota, USGS GAP datasets for Montana, North Dakota, and South Dakota, USGS Digital Orthophoto Quarter Quadrangles (DOQQs), USDA ? National Agriculture Statistics Services (NASS) 1:100,000-scale 2000 - 2001 Cropland Data Layer, A Crop-Specific Digital Data Layer for North Dakota website: (http://www.nass.usda.gov/research/Cropland/SARS1a.htm), and USDA National Agriculture Imagery Program (NAIP) Compressed County Mosaic images website (http://www.fsa.usda.gov/FSA/apfoapp?area=home&subject=prog&topic=nai) Land cover classes from ancillary land cover map datasets were cross-walked to NLCD 2001 equivalent classification codes prior to use. ERDAS Imagine models were designed to intersect map images to determine the spatial extent of areas where two or more existing maps agreed on the land cover classification. The resulting land cover image was split into separate images for each class. A convolve model was used on each single-class image to create separation between classes reducing the probability that training points over transitional pixels would be selected. Convolved single-class images were then recombined to create the final image for training point sampling. Training points were generated using the ERDAS Imagine Classifier module Accuracy Assessment tool. Classes were randomly sampled on an individual basis in a proportion roughly approximating the percentage of pixels of the sample class in the training image. The ERDAS NLCD Tool module and the utility Convert Pixels to ASCII were used interchangeably to generate independent variable values for use in the .data file. Once an initial classification was completed, a number of subsequent iterations were necessary to improve the classification result. A series of PERL scripts specifically written for this project were used to make adjustments to the C5 .data file as required to generate an acceptable map. Note that the training data were used to map all land cover classes except for four classes in urban and sub-urban areas (developed open space, low intensity developed, medium intensity developed, high intensity developed). All urban and suburban land cover classes were mapped and quality assessed separately through a sub-pixel quantification of impervious surfaces using a regression tree modeling method. Following the development of the best classification through decision tree modeling, additional steps were required to complete the final land cover product. The four classes in urban and suburban areas were determined from the percent imperviousness mapping product (described in the next section). The threshold for the four classes is: (1) developed open space (imperviousness < 20%), (2) low-intensity developed (imperviousness from 20 - 49%), (3) medium intensity developed (imperviousness from 50 -79%), and (4) high-intensity developed (imperviousness > 79%). Other classes of forest and non-forest were combined with the urban classes to complete the land cover product. Finally visual inspection of the classification was made with areas/pixels that were wrongly classified delineated first as an "area of interest" (AOI), subsequently then limited manual editing was done to eliminate the classification error within the AOI. The completed single pixel product was then generalized to a 1 acre (approximately 5 ETM+ 30 m pixel patch) minimum mapping unit product using a "smart eliminate" algorithm. This aggregation program subsumes pixels from the single pixel level to a 5-pixel patch using a queens algorithm at doubling intervals. The algorithm consults a weighting matrix to guide merging of cover types by similarity, resulting in a product that preserves land cover logic as much as possible. Acquisition dates of Landsat ETM+ (TM) scenes used for land cover classification in zone 30 are as follows: SPRING- Index 1 for Path 32/Row 28 on 05/02/00 = Scene_ID 7032028000012350 Index 1 for Path 32/Row 29 on 05/02/00 = Scene_ID 7032029000012350 Index 2 for Path 33/Row 27 on 05/12/01 = Scene_ID 7033027000113250 Index 3 for Path 33/Row 28 on 05/01/00 = Scene_ID 5033028000012210 Index 3 for Path 33/Row 29 on 05/01/00 = Scene_ID 5033029000012210 Index 4 for Path 34/Row 26 on 04/30/00 = Scene_ID 7034026000012150 Index 4 for Path 34/Row 27 on 04/30/00 = Scene_ID 7034027000012150 Index 5 for Path 34/Row 28 on 04/25/01 = Scene_ID 5034028000111510 Index 5 for Path 34/Row 29 on 04/25/01 = Scene_ID 5034029000111510 Index 6 for Path 35/Row 26 on 05/13/02 = Scene_ID 7035026000213350 Index 6 for Path 35/Row 27 on 05/13/02 = Scene_ID 7035027000213350 Index 7 for Path 36/Row 26 on 04/20/00 = Scene_ID 5036026000011110 Index 8 for Path 36/Row 27 on 03/27/00 = Scene_ID 7036027000008750 Index 9 for Path 36/Row 28 on 05/17/01 = Scene_ID 7036028000113750 LEAF ON (Summer)- Index 1 for Path 32/Row 28 on 08/25/01 = Scene_ID 7032028000123750 Index 1 for Path 32/Row 29 on 08/25/01 = Scene_ID 7032029000123750 Index 2 for Path 33/Row 27 on 07/12/00 = Scene_ID 7033027000019450 Index 2 for Path 33/Row 28 on 07/12/00 = Scene_ID 7033028000019450 Index 2 for Path 33/Row 29 on 07/12/00 = Scene_ID 7033029000019450 Index 3 for Path 34/Row 27 on 07/06/01 = Scene_ID 7034027000118750 Index 4 for Path 34/Row 28 on 07/22/01 = Scene_ID 7034028000120350 Index 5 for Path 34/Row 29 on 07/09/02 = Scene_ID 7034029000219050 Index 6 for Path 35/Row 27 on 06/30/02 = Scene_ID 7035027000218150 Index 7 for Path 36/Row 27 on 08/18/00 = Scene_ID 7036027000023150 Index 8 for Path 36/Row 27 on 08/19/03 = Scene_ID 5036027000323110 Index 8 for Path 36/Row 28 on 08/19/03 = Scene_ID 5036028000323110 LEAF-OFF (Fall)- Index 1 for Path 32/Row 28 on 09/26/01 = Scene_ID 7032028000126950 Index 2 for Path 32/Row 29 on 09/05/02 = Scene_ID 5032029000224810 Index 3 for Path 33/Row 27 on 09/14/00 = Scene_ID 7033027000025850 Index 4 for Path 33/Row 28 on 09/25/01 = Scene_ID 5033028000126810 Index 3 for Path 33/Row 29 on 09/14/00 = Scene_ID 7033029000025850 Index 5 for Path 34/Row 26 on 10/23/00 = Scene_ID 7034026000029750 Index 6 for Path 34/Row 27 on 10/07/00 = Scene_ID 7034027000028150 Index 6 for Path 34/Row 28 on 10/07/00 = Scene_ID 7034028000028150 Index 7 for Path 34/Row 29 on 10/23/00 = Scene_ID 7034029000029750 Index 8 for Path 35/Row 26 on 11/02/01 = Scene_ID 7035026000130650 Index 9 for Path 35/Row 27 on 10/01/01 = Scene_ID 7035027000127450 Index10 for Path 36/Row 26 on 09/17/99 = Scene_ID 7036026009926050 Index11 for Path 36/Row 27 on 09/30/01 = Scene_ID 5036027000127310 Index12 for Path 36/Row 28 on 09/22/01 = Scene_ID 7036028000126550 Landsat data and ancillary data used for the land cover prediction - Data Type of DEM composed of 1 band of Continuous Variable Type. Data Type of Slope composed of 1 band of Continuous Variable Type. Data Type of Aspect composed of 1 band of Categorical Variable Type. Data type of Position Index composed of 1 band of Continuous Variable Type.



Process contact
Organization's name U.S. Geological Survey
Contact's position Customer Services Representative
Contact's role  processor


Contact information
Phone
Voice 605/594-6151
TDD/TTY 605/594-6933
Fax 605/594-6589

Address
Type both
Delivery point USGS/EROS
Delivery point 47914 252nd Street
City Sioux Falls
Administrative area SD
Postal code 57198-0001
Country US
e-mail addresscustserv@usgs.gov

Hours of service
0800 - 1600 CT, M - F (-6h CST/-5h CDT GMT)



Source data
Relationship to the process step used


Source citation
Alternate titles  Landsat ETM, DOQQ, USDA, FIA, DEM, USGS/EROS, IKONOS






Source data
Relationship to the process step produced


Source citation
Alternate titles  USGS NLCD








Distribution 

Distributor
Contact information
Organization's name U.S. Geological Survey
Contact's position Customer Service Representative
Contact's role  distributor


Contact information
Phone
Voice 605/594-6151
TDD/TTY 605/594-6933
Fax 605/594-6589

Address
Type both
Delivery point USGS/EROS
Delivery point 47914 252nd Street
City Sioux Falls
Administrative area SD
Postal code 57198-0001
Country US
e-mail addresscustserv@usgs.gov

Hours of service
0800 - 1600 CT, M - F (-6h CST/-5h CDT GMT)

Contact instructions
The USGS point of contact is for questions relating to the data display and download from this web site. Questions about the NLCD mapping zone 30 can be directed to the NLCD 2001 land cover mapping team at the USGS/EROS, Sioux Falls, SD (605) 594-6151 or mrlc@usgs.gov.



Available format
Name Arc/Info Export Format and/or ArcView Shapefile
Version ArcGIS 9.0
Specification ASCII
Technical prerequisites ESRI ArcMap Suite and/or Arc/Info software, and supporting operating systems.


Ordering process
Terms and fees None
Turnaround time
Variable

Instructions
Contact Customer Services


Transfer options
Transfer size 0.001


Online source
Locationhttp://seamless.usgs.gov
Description  The URL http://seamless.usgs.gov provides a map interface that allows for data downloads within a customer defined area of interest. Zoom tools are available that can be used to investigate areas of interest on the map interface. The download tool allows the customer to capture layers from the map, utilizing the Seamless Data Distribution System process for downloading. A request summary page is then generated with the download layers listed. By clicking the "download" button on the summary page, a zipped file will be generated that can be saved on the customer's computer. The file can then be unzipped and imported into various user software applications.

Transfer options
Online source
Description  Downloadable data



Distribution format
*Name SDE Raster Dataset


Fields 

Details for object NDHUB.SDE_VAT_44 
*Type Table
*Row count 16
Definition
NLDC Land Cover Layer

Definition source
National Land Cover Database 2001



Field ObjectID
 
*Alias OBJECTID
*Data type OID
*Width 4
*Precision 10
*Scale 0
Field description
Internal feature number

Description source
ESRI

Description of values
Sequential unique whole numbers that are automatically generated.





Field Count
 
*Alias COUNT
*Data type Integer
*Width 4
*Precision 10
*Scale 0
Field description
A nominal integer value that designates the number of pixels that have each value in the file; histogram column in ERDAS Imagine raster attributes table

Description source
NLCD 2001

Description of values
Integer





Field Value
 
*Alias VALUE
*Data type Integer
*Width 4
*Precision 10
*Scale 0
Field description
Land Cover Class Code Value.  Class definitions marked with an asterisk (*) are Coastal NLCD Classes only.

Description source
NLCD 2001

List of values
Value 1
Description No data value, Alaska zones only
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 11
Description Open Water - All areas of open water, generally with less than 25% cover or vegetation or soil
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 12
Description Perennial Ice/Snow - All areas characterized by a perennial cover of ice and/or snow, generally greater than 25% of total cover.
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 21
Description Developed, Open Space - Includes areas with a mixture of some constructed materials, but mostly vegetation in the form of lawn grasses. Impervious surfaces account for less than 20 percent of total cover. These areas most commonly include large-lot single-family housing units, parks, golf courses, and vegetation planted in developed settings for recreation, erosion control, or aesthetic purposes
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 22
Description Developed, Low Intensity -Includes areas with a mixture of constructed materials and vegetation. Impervious surfaces account for 20-49 percent of total cover. These areas most commonly include single-family housing units.
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 23
Description Developed, Medium Intensity - Includes areas with a mixture of constructed materials and vegetation. Impervious surfaces account for 50-79 percent of the total cover. These areas most commonly include single-family housing units.
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 24
Description Developed, High Intensity - Includes highly developed areas where people reside or work in high numbers. Examples include apartment complexes, row houses and commercial/industrial. Impervious surfaces account for 80 to100 percent of the total cover.
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 31
Description Barren Land (Rock/Sand/Clay) - Barren areas of bedrock, desert pavement, scarps, talus, slides, volcanic material, glacial debris, sand dunes, strip mines, gravel pits and other accumulations of earthen material. Generally, vegetation accounts for less than 15% of total cover.
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 32
Description Unconsolidated Shore* - Unconsolidated material such as silt, sand, or gravel that is subject to inundation and redistribution due to the action of water. Characterized by substrates lacking vegetation except for pioneering plants that become established during brief periods when growing conditions are favorable. Erosion and deposition by waves and currents produce a number of landforms representing this class.
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 41
Description Deciduous Forest - Areas dominated by trees generally greater than 5 meters tall, and greater than 20% of total vegetation cover. More than 75 percent of the tree species shed foliage simultaneously in response to seasonal change.
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 42
Description Evergreen Forest - Areas dominated by trees generally greater than 5 meters tall, and greater than 20% of total vegetation cover. More than 75 percent of the tree species maintain their leaves all year. Canopy is never without green foliage.
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 43
Description Mixed Forest - Areas dominated by trees generally greater than 5 meters tall, and greater than 20% of total vegetation cover. Neither deciduous nor evergreen species are greater than 75 percent of total tree cover.
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 51
Description Dwarf Scrub - Alaska only areas dominated by shrubs less than 20 centimeters tall with shrub canopy typically greater than 20% of total vegetation. This type is often co-associated with grasses, sedges, herbs, and non-vascular vegetation.
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 52
Description Shrub/Scrub - Areas dominated by shrubs; less than 5 meters tall with shrub canopy typically greater than 20% of total vegetation. This class includes true shrubs, young trees in an early successional stage or trees stunted from environmental conditions.
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 71
Description Grassland/Herbaceous - Areas dominated by grammanoid or herbaceous vegetation, generally greater than 80% of total vegetation. These areas are not subject to intensive management such as tilling, but can be utilized for grazing.
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 72
Description Sedge/Herbaceous - Alaska only areas dominated by sedges and forbs, generally greater than 80% of total vegetation. This type can occur with significant other grasses or other grass like plants, and includes sedge tundra, and sedge tussock tundra.
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 73
Description Lichens - Alaska only areas dominated by fruticose or foliose lichens generally greater than 80% of total vegetation.
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 74
Description Moss- Alaska only areas dominated by mosses, generally greater than 80% of total vegetation.
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 81
Description Pasture/Hay - Areas of grasses, legumes, or grass-legume mixtures planted for livestock grazing or the production of seed or hay crops, typically on a perennial cycle. Pasture/hay vegetation accounts for greater than 20 percent of total vegetation.
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 82
Description Cultivated Crops - Areas used for the production of annual crops, such as corn, soybeans, vegetables, tobacco, and cotton, and also perennial woody crops such as orchards and vineyards. Crop vegetation accounts for greater than 20 percent of total vegetation. This class also includes all land being actively tilled.
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 90
Description Woody Wetlands - Areas where forest or shrub land vegetation accounts for greater than 20 percent of vegetative cover and the soil or substrate is periodically saturated with or covered with water.
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 91
Description Palustrine Forested Wetland* -Includes all tidal and non-tidal wetlands dominated by woody vegetation greater than or equal to 5 meters in height and all such wetlands that occur in tidal areas in which salinity due to ocean-derived salts is below 0.5 percent. Total vegetation coverage is greater than 20 percent.
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 92
Description Palustrine Scrub/Shrub Wetland* - Includes all tidal and non-tidal wetlands dominated by woody vegetation less than 5 meters in height, and all such wetlands that occur in tidal areas in which salinity due to ocean-derived salts is below 0.5 percent. Total vegetation coverage is greater than 20 percent. The species present could be true shrubs, young trees and shrubs or trees that are small or stunted due to environmental conditions.
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 93
Description Estuarine Forested Wetland* - Includes all tidal wetlands dominated by woody vegetation greater than or equal to 5 meters in height, and all such wetlands that occur in tidal areas in which salinity due to ocean-derived salts is equal to or greater than 0.5 percent. Total vegetation coverage is greater than 20 percent.
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 94
Description Estuarine Scrub/Shrub Wetland* - Includes all tidal wetlands dominated by woody vegetation less than 5 meters in height, and all such wetlands that occur in tidal areas in which salinity due to ocean-derived salts is equal to or greater than 0.5 percent. Total vegetation coverage is greater than 20 percent.
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 95
Description Emergent Herbaceous Wetlands - Areas where perennial herbaceous vegetation accounts for greater than 80 percent of vegetative cover and the soil or substrate is periodically saturated with or covered with water.
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 96
Description Palustrine Emergent Wetland (Persistent)* - Includes all tidal and non-tidal wetlands dominated by persistent emergent vascular plants, emergent mosses or lichens, and all such wetlands that occur in tidal areas in which salinity due to ocean-derived salts is below 0.5 percent. Plants generally remain standing until the next growing season.
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 97
Description Estuarine Emergent Wetland* - Includes all tidal wetlands dominated by erect, rooted, herbaceous hydrophytes (excluding mosses and lichens) and all such wetlands that occur in tidal areas in which salinity due to ocean-derived salts is equal to or greater than 0.5 percent and that are present for most of the growing season in most years. Perennial plants usually dominate these wetlands.
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 98
Description Palustrine Aquatic Bed* - The Palustrine Aquatic Bed class includes tidal and nontidal wetlands and deepwater habitats in which salinity due to ocean-derived salts is below 0.5 percent and which are dominated by plants that grow and form a continuous cover principally on or at the surface of the water. These include algal mats, detached floating mats, and rooted vascular plant assemblages.
Enumerated domain value definition source NLCD 2001 land cover class descriptions


Value 99
Description Estuarine Aquatic Bed* - Includes tidal wetlands and deepwater habitats in which salinity due to ocean-derived salts is equal to or greater than 0.5 percent and which are dominated by plants that grow and form a continuous cover principally on or at the surface of the water. These include algal mats, kelp beds, and rooted vascular plant assemblages.
Enumerated domain value definition source NLCD 2001 land cover class descriptions




Field CLASS_NAME
 
*Alias CLASS_NAME
*Data type String
*Width 40
*Precision 0
*Scale 0






Overview Description
Entity and Attribute Overview
Attributes defined by USGS and ESRI

Value     Class Name

0             Background
1             Open Water
2             Developed, Open Space
3             Developed, Low Intensity
4             Developed, Medium Intensity
5             Developed, High Intensity
6             Barren Land (Rock/Sand/Clay)
7             Deciduoud Forest
8             Evergreen Forest
9             Mixed Forest
10           Shrubland
11           Grassland/Herbaceous
12           Pasture/Hay
13           Cultivated Crops
14           Woody Wetlands
15           Emergent Herbaceous Wetlands



Entity and Attribute Detail Citation
Attribute accuracy is described, where present, with each attribute defined in the Entity and Attribute Section.  Note: To ensure all areas of mapping zone 30 are completely covered, a 3,000 meter (100 Landsat pixels) buffer was added to the boundary of mapping zone 30.





Metadata Details 

Metadata language English (UNITED STATES)
Metadata character set  utf8 - 8 bit UCS Transfer Format


Scope of the data described by the metadata  dataset
Scope name* dataset


*Last update 2016-01-27


ArcGIS metadata properties
Metadata format ArcGIS 1.0


Created in ArcGIS for the item 2008-12-18 09:34:56
Last modified in ArcGIS for the item 2016-01-27 09:48:08


Automatic updates
Have been performed Yes
Last update 2016-01-27 09:48:08


Metadata Contacts 

Metadata contact
Organization's name U.S. Geological Survey
Contact's position Customer Services Representative
Contact's role  point of contact


Contact information
Phone
Voice 605/594-6151
TDD/TTY 605/594-6933
Fax 605/594-6589

Address
Type both
Delivery point 47914 252nd Street
Delivery point USGS/EROS
City Sioux Falls
Administrative area SD
Postal code 57198-0001
Country US
e-mail addresscustserv@usgs.gov

Hours of service
0800 - 1600 CT, M - F (-6h CST/-5h CDT GMT)



Metadata Constraints 

Security constraints
Classification system None


Additional restrictions
None