Reliability class of polygon

Reliability of generalized maps is required to provide an indication of the confidence that can be placed in derivative interpretations and to assist in assigning priorities for future field-mapping projects. Four levels of map reliability have been established in relation to inspection intensity and publication scale of source documents and whether aerial photographs are used during field mapping.

1. Reliability infomation was found in the PAT as well as the DOM and SUBDOM files. The lowest of the three values for any given polygon was used for this version.
2. For areas of the country where this field was left blank in version 1.0, a value of "V" was assigned.

This information was originally found in SLC verson 1.0. It was translated to version 2.2 using a polygon intersection approach.

Compiled from modern soil survey maps produced from field traverses at <= 1.6 km intervals and with the aid of stereoscopic aerial photographs.

Produced from systematic traverses by helicopter and by interpretation of stereoscopic aerial photographs

Compiled from modern soil survey procedures, which include traversing existing accessible roads in wilderness areas, and aided by interpretation of stereoscopic aerial photographs.

Compiled from soil survey maps produced from field traverses at wide intervals (up to 10 km) and without the use of aerial photographs

Compiled from maps produced by inspections using fixed wing aircraft or helicopter and aided by the interpretation of LANDSAT imagery.

Compiled from interpretation of LANDSAT data only; no ground data were collected for verification of these areas.

Reliability was not identified.