Map Grades

 

 

 

 

 

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British Cave Research Associations

Map Grading System 1

 

                              Grade 1 - A sketch of low accuracy where no measurements have been made.

                              Grade 2 - May be used, if necessary, to describe a sketch that is intermediate

                              between grades 1 and 3.

Grade 3 - A rough magnetic survey. Horizontal and vertical angles measured to + 2.5 degrees; distances measured to + 50 cm (+ 20 in); station position error less than + 50 cm (+ 20 in).

Grade 4 - May be used, if necessary, to describe a survey that fails to attain all of the requirements of grade 5 but is more accurate than grade 3.

Grade 5 - A magnetic survey, horizontal and vertical angles accurate to + 1 degree; distances accurate to + 10 cm; station position error less than + 10 cm (+ 3.9 in).

Grade 6 - A magnetic survey that is more accurate than grade 5.

Grade X - A survey that is based primarily on the use of a theodolite instead of a compass.

 

Classification of Survey Detail

 

Class A - All details based on memory.

Class B - Passage details estimated and recorded in the cave.

Class C - Measurements of detail made at survey stations only.

Class D - Measurements of detail made at survey stations and whenever necessary between stations to show significant changes in passage shape, size, direction, etc.

1 Burge, John, 1988, Basic Underwater Cave Surveying,, NSS-CDS, Pensacola, FL, p. 111.

 

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