Wind erosion, a primary cause of soil degeneration, is a problem in arid and semiarid areas throughout the world. Many methods are available to study soil erosion, but there is no an effective method for making quantitative measurements in the field. To solve this problem, we have developed a new instrument that can measure the change in the shape of the soil surface, allowing quick quantification of wind erosion. In this paper, the construction and principle of the new instrument are described. Field experiments are carried out using the instrument, and the data are analyzed. The erosion depth is found to vary by 11% compared to the average for measurement areas ranging from 3 0 × 3 0 c m 2 to 1 0 × 1 0 c m 2 . The results show that the instrument is convenient and reliable for quantitatively measuring wind erosion in the field.

/pdf/a-new-instrument-for-testing-wind-erosion-by-soil-surface-59m7tldagj.pdf

A New Instrument for Testing Wind Erosion by Soil Surface Shape Change

GPS satellite surveying technique is an important stone mark in surveying and mapping history. Building and developing LADGPS and WADGPS are effective means of improving GPS real time positioning accuracy .Using GPS receivers on ground points and in plane to adapt proper method, which can satisfy the needs of accuracy for aerial triangle survey on several scales .At present, the technique of RS、GIS and GPS integration is an important contents of geomatics researches. The comprehensive utilization of three technologies consists of a processing system of overall, real time and dynamic for earth observation, analysis and application.

Discussion of Several Problems on GPS Researches

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Discussion of Several Problems on GPS Researches