Identification Information

Title Gallup, NM 1:250,000 Quad West Half USGS Land Use/Land Cover, 2000

Date 2009-02-19

Date Type Publication

Cited Responsible Party

Organization Name USGS USEPA EDAC

Role identify

Presentation Form vector digital data

Abstract This land cover data set was produced as part of a cooperative project between the U.S. Geological Survey (USGS) and the U.S. Environmental Protection Agency (USEPA) to produce a consistent, land cover data layer for the conterminous U.S. based on 30-meter Landsat thematic mapper (TM) data. National Land Cover Data (NLCD) was developed from TM data acquired by the Multi-resoultion Land Characterization (MRLC) Consortium. The MRLC Consortium is a partnership of federal agencies that produce or use land cover data. Partners include the USGS (National Mapping, Biological Resources, and Water Resources Divisions), USEPA, the U.S. Forest Service, and the National Oceanic and Atmospheric Administration.

Purpose The New Mexico NLCD set was produced as part of a project areaencompassing portions of Federal Regions 6. This data set was produced under the direction of the MRLC Regional Land Cover Characterization Project of the USGS EROS Data Center (EDC), Sioux Falls, SD. Questions about the data set can be directed to the MRLC Regional Team at (605) 594-6114 or mrlc@edcmail.cr.usgs.gov.

Supplemental Information The original statewide 30-meter data has been resampled to 90-meter resolution and clipped into 39 separate coverages based on USGS 250K quad grids. Each coverage represents one-half of a 250K quad grid.

Status Complete

Point of Contact

Individual Name

Organization Name Earth Data Analysis Center

Position Name RGIS Clearinghouse Manager

Role Point of contact

Voice (505) 277-3622

Facsimile (505) 277-3614

Address

Delivery Point MSC01 1110
Delivery Point 1 University of New Mexico
City Albuquerque
Administrative Area New Mexico
Postal Code 87131-0001
Country USA

Electronic Mail Address clearinghouse@edac.unm.edu

Maintenance and Update Frequency As needed

Descriptive Keywords Land Use/Land Cover, Land Management, Land Resources, EDAC, EDC, EPA, EROS, Imagery, Land Characterization, Land Cover, Landsat, MRLC, Remote Sensing, Satellite, Space Imaging, USGS

Access Constraints None.

Use Constraints None. Acknowledgement of the U.S. Geological Survey and Earth Data Analysis Center (EDAC) would be appreciated in products derived from these data.

Language English

Topic Category

Extent

Geographic Bounding Box

West Bound -109.045768737793
East Bound -108.999862670898
North Bound 35.9996261596679
South Bound 34.9997253417968

Temporal Extent

Beginning Position 1988-06-08
Ending Position 1993-09-28

Data Quality Information

Attribute Accuracy Report

Report An accuracy assessment is done on all NLCD on a Federal Region basis following a revision cycle that incorporates feedback from MRLC partners and affiliated users. The accuracy assessments conducted by private sector vendors under contract to the USEPA. A protocol has been established by the USGS and USEPA that incorporates two-stage, geographically stratified cluster sampling plan (Zhu et al., 1999) utilizing National Aerial Photography Program (NAPP) as the sampling frame and the basic sampling unit. In this design a NAPP photograph is defined as a 1st stage or primary unit (PSU), and a sampled pixel within each PSU is treated a 2nd stage or secondary sampling unit (SSU). PSU's are selected from a sampling grid based on NAPP flight-lines and photo centers, each grid cell measures 15' X 15' (minutes of and consists of 32 NHAP photographs. A geographically random sampling is performed with 1 NAPP photo being randomly selected from each cell (geographic strata), if a sampled photo falls outside of the regional boundary it is not used. Second stage sampling is accomplished by selecting SSU's (pixels) within each PSU (NAPP photo) to provide the actual locations for the reference land cover SSU's are manually interpreted and misclassification errors are estimated and described using a traditional error matrix as well as a number of other important measures including the overall proportion of pixels correctly classified, user's and producer's accuracies, and omission and commission error probabilities. At the time of CD release (Spring 2001), the accuracy assessment was not complete. For the Region VI accuracy assessment please check the NLCD Website: accuracy assessment numbers will be posted there when they become available.

Quantitative Attribute Accuracy Assessment

Attribute Accuracy Value
Attribute Accuracy Explanation

Horizontal Positional Accuracy Report

Report Each Landsat Thematic Mapper image used to create the NLCD was terrain-corrected using 3-arc-second digital terrain data (DTED), and georegistered using ground control This resulted in a root mean square registration error less than 1 pixel (30 meters) in the original 30-meter statewide coverage. Resampling to 90-meter resolution may have resulted in some loss of accuracy.

Quantitative Horizontal Positional Accuracy Assessment

Horizontal Positional Accuracy Value
Horizontal Positional Accuracy Explanation

Logical Consistency Report An unsupervised classification algorithm was used to classify the mosaicked multiple leaf-off TM scenes. Aerial photographs were to interpret and label classes into land cover categories and ancillary data sources resolved the class confusion. Further land cover information from leaf-on TM data, NWI data, and other sources incorporated to refine and augment the "basic" classification.

Completeness Report All photo-interpretable data were mapped in the original 30-meter resolution dataset. Resampling to 90-meter resolution may have resulted in the loss of some data.

Lineage

Source Information

Source Citation

Source Scale Denominator

Type of Source Media Arc/Info coverage or shapefile

Source Time Period of Content

Beginning Position 1988-06-08
Ending Position 1993-09-28
Source Currentness Reference ground condition

Source Citation Abbreviation Unknown

Source Contribution Unknown

Process Step

Process Description Conversion of original New Mexico Land Cover Data Set: The original data set, downloaded from http://edcwww.cr.usgs.gov/programs/lccp/mrlcreg.html, was converted to an Arc/Info grid and projected to geographic, decimal degrees, NAD83, GRS80. The resulting grid was then clipped to USGS 250K quad boundaries using Arc/Info 8.0.1. These were further clipped using USGS 100K quad boundaries into grids representing one-half of a 250K quad grid. The resulting grids were converted to vector coverages, and then, using ArcView 3.2, into shapefiles.

Process Date 2001-05-21

Process Time

Process Contact

Individual Name

Organization Name Earth Data Analysis Center

Position Name GIS Manager

Role Point of contact

Voice (505) 277-3622

Facsimile (505) 277-3614

Address

Delivery Point MSC01 1110
Delivery Point 1 University of New Mexico
City Albuquerque
Administrative Area New Mexico
Postal Code 87131-0001
Country USA

Electronic Mail Address clearinghouse@edac.unm.edu

Gallup, NM 1:250,000 Quad West Half USGS Land Use/Land Cover, 2000

Metadata from the RGIS Metadata Repository

Identification Information

Distribution Information

Spatial Reference Information

Data Quality Information

Metadata Reference Information