Analysis of Alluvial Fan Flooding
Alluvial fans are estimated to cover approximately one third of the land area in the southwestern United States. Because of their relatively gentle slopes and well draining characteristics,...
Orthophotoquad Mapping Program for Alaska
The U. S. Geological Survey (USGS) is the lead civilian mapping agency in the United States and is responsible for creating and maintaining numerous map series. In Alaska the standard...
Hydraulic Profile Computation Using CADD
The data preparation can also be performed by directly recording onto a computer tape the aerial survey cross section ground points and the field survey work. A computer program can then...
Development of a Computerized Wetlands Mapping Data Base for Use in Section 404 Jurisdictional Determinatins in San Francisco Bay
Development and habitat alteration in the San Francisco Bay-Delta system have placed the remaining wetlands in jeopardy. The Bay-Delta wetlands will be mapped in a joint project of the...
Remote Sensing of Mangrove Areas on the Brazilian Coast
Remote sensing techniques are compared when applied on the survey of mangrove areas. The use of LANDSAT MSS scenes from channels 5 and 7, processed by interactive analyzer, allowed the...
Calendar: A 1985 Calendar of Bridge Photographs
Featured bridges are: Golden Gate Bridge (CA); Richmond . San Rafael Bridge (CA); Market Street Bridge (PA); Alsea Bay Bridge (OR); Longview Bridge (WA); Tyrone Bridge (KY); Newport Bridge...
Making Maps by Computer�City and Utilities Team Up in Pioneer Effort
There is heavy duplication of map making and maintenance�as many as 68 different maps of the same area were counted in the Vancouver, Canada, suburb of Burnaby. This, and the fact that...
Mapping America is Never-Ending Task for USGS
For its first topographic surveys, begun in 1879, USGS measured distances by counting revolutions of a wheel, ran traverses by chain and compass, and used a barometer to determine elevations....
450 Miles of Rail Line Mapped in Nine Months
Working under one of the largest single contracts for survey services ever awarded, two Washington, D.C. survey companies lead a group of thirteen land and aerial survey firms in mapping...
Aerial Photography�� From Balloon to Rocket
Aerial photography began long before the Wright brothers first flew an airplane in 1903. Lifted aloft by balloons and/or kites, cameras snapped aerial photos of Paris and Boston as early...
Hydrographic Surveying Turns to Electronics
Traditional technique for measuring water depth is to use a lead-weighted line. The tag line, stretched along the water surface so soundings are made in orderly fashion, can be dangerous....
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