Abstract:

This data set represents the existing spatial distribution of both existing historic trails and recreational trails within the Arizona Strip District.

Purpose:

For regional analysis and display at 1:24,000.  This dataset was prepared/acquired for use in the ASDO resource management planning process.  The data set is intended to be used as a tool for the current land use planning effort, portraying the existing trails (historic and recreational) in the planning area.  The data is also used as a basis for various visitor information media publications.

Supplemental information:

Dataset locally known as asfo_trl.  This dataset and other datasets in the Arizona Strip District Office Geographic Information Database (ASDOGID) represent data for the BLM Arizona Strip District Office, and may include the Arizona Strip Field Office, Vermilion Cliffs National Monument (VCNM) and/or the Grand Canyon-Parashant National Monument (GCPNM or PARA).  The Grand Canyon-Parashant National Monument is managed jointly by the BLM and the National Park Service (NPS).

Currentness reference:

ground condition

Use constraints:

This data should not be used at a scale larger than 1:24,000.  The data and corresponding attributes are only as accurate as the source maps from which they were obtained, and may vary depending on the data and method of acquisition.

This data is suitable for regional planning, management decision support at intermediate scales (i.e. 1:24,000 or smaller), and cartographic purposes.  The data is not suitable for analysis at scales larger than 1:24,000.

If the Receiving Agency (RA) has modified the data in any way, they are obligated to describe the types of modifications they have performed on hardcopy maps utilizing the data.  RA specifically agrees not to misrepresent ASDOGID datasets or to imply that any changes made were approved by BLM ASDO or NPS.

No warranty is made by the BLM/NPS for use of the data for purposes not intended by BLM/NPS.  This information may be updated without notification.

Address:

345 East Riverside Dr.

Please use email to contact.

Attribute accuracy report:

Feature attributes were taken from source material.  Code assignments are believed to be representative of the source document.

Logical consistency report:

Data was reviewed for correct topological structure.  Duplicate lines have been removed.

Completeness report:

This dataset covers the entire BLM Arizona Strip District.  It is constantly being reviewed and added to as additional information becomes available.

Horizontal positional accuracy report:

Overall horizontal accuracy for this data is not greater than national mapping accuracy standards (NMAS) for USGS source maps.  Snapping and coordinate shift tolerances were maintained at 0.01 meters or less through editing.  Horizontal positional accuracy for the digital data set was tested by visual comparison of the source data with hard copy verification plots.

Process description:

Recreation Planners screen digitize recreation trails using field maps with trails drawn on them (7.5 minute topographic maps)

Address:

345 East Riverside Drive

Process description:

Arizona Trail arc (GPS data) is added to Recreation Trail theme

Address:

345 East Riverside Drive

Process description:

GIS specialist screen digitize the historic trails from the AZ Strip Visitor Map.

Address:

345 East Riverside Drive

Process description:

Recreation Trail theme and Historic Trail theme are combined to form a single theme for trails. Data set was stored in a master file in the computer system.

Address:

345 East Riverside Drive

*Attribute definition:

Internal feature number.