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| 11. |
Modelling and navigating space-time drift of digitized radar rainfall patterns |
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International Journal of Remote Sensing,
Volume 11,
Issue 6,
1990,
Page 1055-1064
NICOLASR. DALEZIOS,
NICHOLAS KOUWEN,
PANAGIOTISC. LINARDIS,
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摘要:
A navigation model is developed and used to account for the horizontal drift of the falling radar rainfall patterns due to wind. In addition to the horizontal displacement of the radar rainfall field, the model also computes the time required by a raindrop to reach the ground from the level that is detected by radar. A bivariate statistical objective analysis is used as a basis for comparison. An error statistic is computed to evaluate the performance of the navigation model. The results indicate that the horizontal displacement of the rainfall field ranges between 1 and 4 km, and the time required by a rain particle to reach the ground varies from 1 to 4 min. The effect of the model on horizontal displacement decreases with increasing integration time and area size.
ISSN:0143-1161
DOI:10.1080/01431169008955077
出版商:Taylor & Francis Group
年代:1990
数据来源: Taylor
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| 12. |
The relationship between sensor geometry, vegetation-canopy geometry and image variance |
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International Journal of Remote Sensing,
Volume 11,
Issue 6,
1990,
Page 1075-1083
M. J. BARNSLEY,
S. A. W. KAY,
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PDF (276KB)
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摘要:
The geometry of the sensor and the vegetation canopy have an effect upon the variance of the detected spectral response of a single cover type in an image. The procedure for calculating the size of the ground resolution element (GRE) for a Daedalus ATM scanner is outlined, and examples of changes in variance for four land-cover types are presented. Image variance was found to be inversely related to sensor view angle, owing to the increased size of the GRE, the increased overlap of adjacent elements, and the changing proportions of canopy components viewed by the sensor.
ISSN:0143-1161
DOI:10.1080/01431169008955079
出版商:Taylor & Francis Group
年代:1990
数据来源: Taylor
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| 13. |
Sampling depth of soil moisture content by radiometric measurement at 21 cm wavelength: some experimental results |
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International Journal of Remote Sensing,
Volume 11,
Issue 6,
1990,
Page 1085-1092
P. PAMPALONI,
S. PALOSCIA,
L. CHIARANTINI,
P. COPPO,
S. GAGLIANI,
G. LUZI,
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PDF (229KB)
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摘要:
The thickness of soil layer, through which moisture can be directly estimated by means of a microwave radiometer, has been investigated experimentally on a test area in Central Italy by means of airborne sensors. Aircraft remote sensing data, collected on agricultural bare and vegetated fields during the growth stage of vegetation (May-July 1988), have shown that L band microwave emission is correlated to the average moisture of the first 20 cm of soil under the surface. However, correlation between moisture at difference depths makes the identification of the actual sampling depth difficult.
ISSN:0143-1161
DOI:10.1080/01431169008955080
出版商:Taylor & Francis Group
年代:1990
数据来源: Taylor
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