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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Aerial photosieving of exposed gravel bars for the rapid calibration of airborne grain size maps
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Aerial photosieving of exposed gravel bars for the rapid calibration of airborne grain size maps

机译：暴露的碎石棒的航空光筛，用于快速校准机载粒度图

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摘要

In recent years, fluvial remote sensing has seen considerable progress in terms of methods capable of system scale characterisation of river catchments. One key development is automated grain size mapping. It has been shown that high resolution aerial photography can be used to automatically produce grain size maps over entire rivers. However, current aerial grain size mapping procedures all require field calibration data. The collection of such data can be costly and problematic in the case of remote areas. This paper presents a method developed to remove the need for field based calibration data. Called 'aerial photosieving', this method consists of using the same very high resolution aerial imagery intended for grain size map production to visually measure particle sizes on-screen in order to provide calibration data. The paper presents a rigorous comparison of field-based photosieving calibration data and aerial photosieving calibration data. Statistical tests are used to demonstrate that aerial photosieving gives similar results when compared with field-based data with only a slight systematic overprediction. The new aerial photosieving method therefore simplifies the overall procedure required for the production of grain size maps and thus improves the cost-effectiveness and potential availability of this new fluvial remote sensing technology. Copyright (C) 2010 John Wiley &Sons, Ltd.
机译：近年来，在能够对河流流域进行系统规模表征的方法方面，河流遥感已取得了长足的进步。一种关键的发展是自动粒度映射。已经表明，高分辨率航空摄影可以用于自动生成整个河流的粒度图。但是，当前的航空粒度映射程序都需要现场校准数据。在偏远地区，这种数据的收集可能是昂贵且成问题的。本文提出了一种开发方法，以消除对基于现场的校准数据的需求。这种方法称为“航空照相筛分”，该方法包括使用用于生产粒度图的相同高分辨率的航空影像，以可视方式在屏幕上测量粒度，以提供校准数据。本文提出了基于现场的光筛校准数据和航空光筛校准数据的严格比较。统计测试用于证明与基于现场的数据相比，航空光筛具有相似的结果，只是略微系统地过度预测。因此，新的航空光筛方法简化了生产粒度图所需的整个过程，从而提高了这种新型河流遥感技术的成本效益和潜在可用性。版权所有（C）2010 John Wiley＆Sons，Ltd.

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