The structure of the barchan field located between Tarfaya and Laayoune (Atlantic Sahara, Morroco) is quantitatively investigated and compared to that in La Pampa de la Joya (Arequipa, Peru). On the basis of field measurements, we show how the volume, the velocity and the output sand flux of a dune can be computed from the value of its body and horn widths. The dune size distribution is obtaine...

Developing realistic 3D models of cities provides designers, planners, the public, and the others with imagery closely coupled with the human expertise. This paper continues on the results of an earlier innovation in the field of texture creation for the construction of Virtually Realistic Model (VRM) of buildings in urban areas. Using a CCD camera mounted on a theodolite the system takes the i...

Interpretation of large-scale color infrared and color aerial photography can be a laborand cost-effective means to make inventory of and monitor rangelands while maintaining accuracy. Ground measurements of total vegetation cover, tree, shrub and cacti cover at Organ Pipe Cactus National Monument were taken in 1975 and 1984. Estimates of ground vegetation cover made using large scale (1:1200) ...

The proper treatment and characterization of past hazardous waste sites is becoming more and more important as world population extends into areas previously deemed undesirable. Historical photographs, past records, current aerial satellite imagery can play an important role in characterizing these sites. These data provide clear insight into defining problem areas which can be surface sampled ...

Background: Various methods have been proposed for sampling when data on the population are limited. However, these methods are often biased. We propose a new method to draw a population sample using Global Positioning Systems and aerial or satellite photographs. Results: We randomly sampled Global Positioning System locations in designated areas. A circle was drawn around each location with ra...

The comparison between aerial photographs and satellite images, with regard to their performance, is strongly actual: in fact, advantages and defects of both are well known. In the past , low spatial resolution of satellite images was a limit in cartographical applications : now, the recent orbital platform are improving the data quality and, at the same time, make very large ground coverage po...

Consultant psychiatrist Mihaela Bucur talks to Kathy Oxtoby about how photographing nature has transformed her life

By means of the progress in photogrammetry; it is now possible to produce the maps of huge areas more quickly and economically but the production steps are still expensive and time consuming. In recent years, parallel to the development in photogrammetry, more effective methods are researched to make available digitizing line features like roads full automatically or semi-automatically from dig...

Detecting cars in large aerial photographs can be quite a challenging task, given that cars in such datasets are often barely visible to the naked human eye. Traditional object detection algorithms fail to perform well when it comes to detecting cars under such circumstances. One would rather use context or exploit spatial relationship between different entities in the scene to narrow down the ...

This publication introduces the concepts and principles of landscape ecology for managing wildlife and other natural resources. It is intended to raise public awareness and give an overview of a new philosophy and method for managing natural resources at the landscape level. A landscape is a heterogenous area composed of a cluster of interacting ecosystems that are repeated in various sizes, sh...