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....

Measuring Watershed Land-Use Changes with Airphotos
Aerial photographs were used to determine land-use changes over a 25-yr period in two watersheds in western South Carolina. The North Tyger River watershed near Spartanburg, S.C., experienced...

Classification and Analysis of River Processes
Aerial photographs and brief field visits are frequently the only data sources for the preliminary design of river engineering works in romote or undeveloped areas. Even if short-term...

Remote Sensing of Turbidity Plumes in Lake Ontario
Space imagery and high-altitude photography provide an effective method of monitoring the dynamics of turbidity plumes in Lake Ontario. The Niagara River plume, as much as 200 sq miles...

Cavitation from Surface Irregularities in High Velocity
Irregularities in flow surfaces of hydraulic structures operating at high velocities have been the source of serious damage by cavitation. The types of surfaces often encountered in construction...

Image Error and Photogrammetric Requirements
A major factor limiting photogrammetric accuracy is the effect of residual errors that displace the photographic image from its ideal (projective) position. Sources of image error and...

Use of Remote Sensing for Mapping Wetlands
This paper summarizes contemporary remote sensing methodology and its application in wetlands. Using color, color infrared, black-and-white, and black-and-white infrared photography, multiband...

Control Densification by Analytic Photogrammetry
Numerical methods in photogrammetry began to receive wide-spread attention in the early fifties with the development of the large digital computers. The Worldwide Satellite Triangulation...

Use of Satellite Data in Urban Hydrologic Models
The study investigates the use of computer-aided analysis of LANDSAT multispectral data in estimating percentage of imperviousness and associated land uses needed in urban hydrologic modeling....

Improved Design of Highway Culvert
New culvert design procedures, incorporating improved inlet concepts, make significant construction savings possible through hydrauically efficient use of the culvert barrel. Two representative...

Surface Currents in the Arctic and Sub-Arctic Seas as Deduced from Satellite Photographs of Ice Floes

Satellite Measurements of Turbidity of Coastal Waters

Orthophotoquads for Arizona Land-Use Mapping and Planning
After initial evaluation of National Aeronautics and Space Administration (NASA) high altitude aerial photography in 1971, the interest in application of high altitude coverage of Arizona...

Aerotriangulation Precision Attainable for Highway Photogrammetry
The magnitude of the standard error, 0.00012 times flight height for large-scale photography was empirically determined by analyzing data from 137 stereo models in 22 flights at heights...

Surveying and Mapping from Orbital Platforms
The methods of triangulation and photogrammetric mappings have been successfully applied to the surveying and mapping of both the moon and the earth. The accuracy of lunar phototriangulation...

Photogrammetric Control Extension for Route Design
It is of utmost importance to select such a method and instrument for aerial triangulation which provides the required accuracy in a most economical way. Nine strips of wide and super-wide...

Clarks Fork Yellowstone River Remote Sensing Study
The Clarks Fork Yellowstone River of Montana and Wyoming, known for its historical sediment and siltation problems, is investigated to locate points at which sediment loads enter the river...

Data Collection Techniques — Time Lapse Photography

Measurement of Dye Concentrations by Photography
A method of measuring concentrations of solutions of dye for dispersion studies in laboratory channels is described. The method uses black and white photography, followed by analysis of...

Modified Methods in Numerical Radial Triangulation
Two new modifications in numerical radial triangulation for extending horizontal control are presented. The first method, called the Method of Independent Stereopairs, involves computation...

 

 

 

 

Return to search