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There is also some benchmarks ( jnh , parity-8 ) where simplicity seems to pay and where performances since 1992 has not really been improved . During this introductory day , the only aspects of the depression discussed are those referenced by the projected images : a ) an explanation of who Dorothea Lange was and why she took the photographs , b ) how poor soil management practices coupled with drought resulted in the Dust Bowl , c ) how displaced farmers became migrant workers , and the conditions of the migrant camps . Outside involvement can also involve individuals and / or standards committees ( e.g ., ASTM , ANSI , ISO ) where measurement methods are vetted and standardized and under whose auspices interlaboratory analyses for characterizing the SRM are carried out . This thesis describes a ) the conditions under which it is possible to detect environmental edges in the range data , b ) how the exploration strategy can be used in an exploration algorithm , and c ) the conditions under which the exploration algorithm is guaranteed to terminate within a finite number of measurements . SphericalHarmonic returns the value of P ( theta , phi ) where theta and phi are defined in terms of a standard spherical coordinate system ( phi measures angle ( x , y , z ) makes with z axis .