AGENCY: Utah Geospatial Resource Center

SERIES: 27110
TITLE: South West region Gap Analysis Program (GAP) records
DATES: 2004-
ARRANGEMENT: Grouped by file type, thereunder chronological

DESCRIPTION: Multi-season satellite imagery (Landsat ETM+) from 1999-2001 were used in conjunction with digital elevation model (DEM) derived Datasets (e.g. elevation, landform, aspect, etc.) to model natural and semi-natural vegetation. The minimum mapping unit for this dataset is approximately 1 acre. Landcover classes are drawn from NatureServe's Ecological System concept, with 109 of the 125 total classes mapped at the system level. For the majority of classes, a decision tree classifier was used to discriminate landcover types, while a minority of classes (e.g. urban classes, sand dunes, burn scars, etc.) were mapped using other techniques. Twenty mapping areas, each characterized by similar ecological and spectral characteristics, were modeled independently of one another. These mapping areas, which included a 4 km overlap, were subsequently mosaicked to create the regional dataset. An internal validation for modeled classes was performed on a withheld 20% of the sample data. Results of the validation will be presented in the project final report and are not available at this time. While the modeling area encompassed these 5 southwestern states (Arizona, Colorado, Nevada, New Mexico, Utah) the actual GIS dataset is of Utah only.

RETENTION

Permanent. Retain for 1 year(s)

DISPOSITION

Transfer to Archives.

RETENTION AND DISPOSITION AUTHORIZATION

Retention and disposition for this series is authorized by Archives general schedule Biota records, GRS-2607

AUTHORIZED: 12/08/2008

FORMAT MANAGEMENT

Computer data files: Retain in Office for 1 year or until superseded and then transfer to State Archives with authority to weed.

APPRAISAL

Historical

The disposition of these records is based on the historical need of the AGRC.

PRIMARY DESIGNATION

Public

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