In 1960 Roland G. Henderson, of the U.S. Geological Survey, published a comprehensive system fro computation of first and second derivatives of potential fields and the continuation of fields to levels above or below the plane of observation. In our study a Fortran IV program (HNDRSN2), based on Henderson's algorithm, uses map data digitized at an equally spaced grid interval. Output from program HNDRSN2 includes maps of the field continued upward or downward from one to five grid units and first and second derivative maps on the surface and on selected downward continued levels. Test cases demonstrate the reliability of the program in standard analyses of gravity and magnetic fields.
Rudman, A. J., and Blakely, R. F., 1975, Fortran program for the upward and downward continuation and derivatives of potential fields: Indiana Geological Survey Occasional Paper 10, 23 p., 2 figs., 5 app.
You may also like:
Can't find what you're looking for? Feel free to contact us directly:
Publication Sales Office
Indiana Geological and Water Survey
420 N. Walnut St.
Bloomington, IN 47404
IGS Return Policy
All sales are final. Materials may not be returned after they have been accepted by the customer. Any discrepencies in mail orders must be reported to IGWS within 10 days of receipt of order.
The Indiana Geological and Water Survey will refund the purchase price and sales tax of products if returned with the original sales receipt within 10 days of receipt of order. Refunds will be issued with the same method of payment as indicated on the original receipt except for cash purchases, which will be refunded by check. Items must be returned in the same condition as purchased. Refunds on digital products and services are not allowed, except for defective media such as CD-ROMs, flash drives, and so on. The customer is responsible for paying shipping costs to return items.