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首页> 外文会议>International symposium on spatial accuracy assessment in natural resources and environmental science >Multispectral Remote Sensing of Shallow Water Bathymetry: Ground Truth Accuracy and Interference
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Multispectral Remote Sensing of Shallow Water Bathymetry: Ground Truth Accuracy and Interference

机译：浅水浴室的多光谱遥感：地面真理精度和干扰

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High resolution airborne digital multispectral and photographic imagery were flown over selected sections of the Horsefly River between 1993 and 1998. The airborne digital imagery was recorded using Sony XC7500 progressive scan cameras with optical filtration in green, red and NIR spectral bands. The photographic imagery included daylight and tungsten colour reversal film and Kodak 2443 IR Aerochrome and EIR colour infrared films. The imagery was flown using the SFU aircraft and camera system in conjunction with detailed ground truth from targeted and surveyed sites. SSC, turbidity and water depth were the principal parameters but substrate and water surface conditions were also considered . Results indicate a high and consistently variable degree of correspondence between the remote sensing of shallow water depth determinations, under relatively clear water conditions (<25mg/l). There was, however, increasing inaccuracy in water depth determinations corresponding to the higher range of these SSC levels (15 - 25mg/l). Above a critical threshold of approximately 25mg/l, there was no significant bottom reflection signal and SSC estimates could be made without bottom reflection considerations. Accuracy was dependent upon reduced water surface reflectance (relatively calm conditions without cloud reflection or shadow), transect selections over spawning gravels (maintaining relative constancy for bottom reflection due to substrate) and determined levels of accuracy for photogrammetric positioning of water depth transects and depth measurement.
机译：高分辨率空气数码多光谱和摄影图像在1993年至1998年间的马蝇河的选定部分中飞行。使用索尼XC7500逐行扫描相机记录空气传播的数字图像，具有绿色，红色和NIR光谱带中的光学过滤。摄影图像包括日光和钨颜色逆转膜和柯达2443红外空气棘手和eir彩色红外线薄膜。使用SFU飞机和相机系统飞行的图像与来自目标和受访的地点的详细的地面真相一起飞行。 SSC，浊度和水深是主要参数，但也考虑了基材和水表面条件。结果表明浅水深度测定的遥感之间的高且始终如一的对应程度，在相对清澈的水条件下（<25mg / L）。然而，对应于这些SSC水平的较高范围（15-25mg / L）的水深度测定中的不准确性增加。高于大约25mg / L的临界阈值，没有显着的底部反射信号，并且可以在没有底部反射注意事项的情况下进行SSC估计。精度依赖于降低水表面反射率（没有云反射或阴影的情况），通过产卵砾石（由于基板引起的底部反射的相对恒定）横断选择，并确定水深横断波摄影定位的精度水平和深度测量的精度。

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