EDITORIAL LATITUDES

Loon, Joseph C

The first article in our SURVEYING NOTES SECtion deals with the role of accretion and M avulsion in fixing the riparian boundary. Author Andrew Kellie discusses the rules regarding these boundaries as well as some specific boundary cases. Thomas McGrath describes “a better way top turn an angle” and gives a procedure for doing this. The third article in this section is by Salvatore Marsico about “the expert witness” who appears in many legal cases. The author discusses the impact of expert witnesses on some cases (e.g., the Kumho Tire Company).

In the SURVEYING HISTORY section, J.D. “Sam” Drucker brings to life an interesting survey by William (Billy) Octavius Owen who used a mastodon bones as a section corner marker!

The first article in our LAND INFORMATION SCIENCE section is the third and last article in a series by Charles Ghilani on “Statistics and Adjustments Explained.” In this article the author deals with the interesting, and important, concept of “error propagation.” This concept is used in least squares adjustment as well as in post-adjustment statistics.

Stacey Lyle, the author of the second article in this section, focuses on an “Investigation into small-format digital camera sensors for development of USDA GIS of crop compliance.” The paper concludes that these cameras are “adequate for collecting the desired images for interpretation of crops and digitizing the boundaries to determine land areas …”

The next article in this section is by a trio of authors-Yafit Cohen, Maxim Shoshany, and Yerach Doytsher-who deal with “Integrating pseudo-hydrologie logic in road extraction.” They used medium resolution satellite images and show success using SPOT and IKONOS images in extracting road and railway features.

Frank Derby discusses “Planning the design of an application-driven GIS” in the next article. He presents “a method for identifying major stakeholders, potential users, essential applications to be supported, and critical data types to be acquired in the development of a county-wide GIS.”

The last article in this section deals with “Local geoid determination using GPS.” Author Kandiah Jeyapalan describes the method (including data collection) that will determine the local geoid to within +/- 2 cm.

Joseph C. Loon

Fellow, American Congress on Surveying and Mapping

jloon@falcon.tamucc.edu

Copyright American Congress on Surveying and Mapping Mar 2004

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