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| **Section 2** | **Section 2** | ||
| - | **Investigation of the Effects of Atmospheric Variability on StaMPS InSAR at Mount St Helens** | + | ====== Investigation of the Effects of Atmospheric Variability on StaMPS InSAR at Mount St Helens ====== |
| **Introduction** | **Introduction** | ||
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| **Figure 7.** Example MODIS profiles of Pressure, Temperature, Water Vapor Pressure, and Refractivity with respect to Altitude are shown.\\ The refractivity is integrated from the DEM height to the top of the profile in the calculation of phase delay. | **Figure 7.** Example MODIS profiles of Pressure, Temperature, Water Vapor Pressure, and Refractivity with respect to Altitude are shown.\\ The refractivity is integrated from the DEM height to the top of the profile in the calculation of phase delay. | ||
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| **Figure 8.** Example map of atmospheric phase delay calculated on a DEM grid covering the Mount St Helens Region. Black Dots spaced at 5km show the locations of the MODIS data points. Mount St Helens is seen as a Blue crescent in the middle of the scene. Red portions of the map experience more delay because they are at lower elevations and the radar will have more atmosphere to pass through. | **Figure 8.** Example map of atmospheric phase delay calculated on a DEM grid covering the Mount St Helens Region. Black Dots spaced at 5km show the locations of the MODIS data points. Mount St Helens is seen as a Blue crescent in the middle of the scene. Red portions of the map experience more delay because they are at lower elevations and the radar will have more atmosphere to pass through. | ||
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| **Figure 9.** Example of an atmospheric phase screen calculated by subtracting the phase screen for May 1 from Jan 1. In this example, there is a positive (red) delay sitting over Mount St Helens, indicating that more water vapor was likely in the air over Helens on Jan 1 than May 1. Black Dots spaced at 5km show the locations of the MODIS data points. Mount St Helens is centered in the scene. | **Figure 9.** Example of an atmospheric phase screen calculated by subtracting the phase screen for May 1 from Jan 1. In this example, there is a positive (red) delay sitting over Mount St Helens, indicating that more water vapor was likely in the air over Helens on Jan 1 than May 1. Black Dots spaced at 5km show the locations of the MODIS data points. Mount St Helens is centered in the scene. | ||
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| **Figure 10.** The end result of a StaMPS like algorithm applied to a series of atmospheric phase screens. Gradients in velocity vary across the scene, but are on the order of 2 cm/yr over a 5km distance at Mount St Helens (Red Circle). It is clear from this figure that the applied temporal filtering does not remove all of the atmospheric signal. | **Figure 10.** The end result of a StaMPS like algorithm applied to a series of atmospheric phase screens. Gradients in velocity vary across the scene, but are on the order of 2 cm/yr over a 5km distance at Mount St Helens (Red Circle). It is clear from this figure that the applied temporal filtering does not remove all of the atmospheric signal. | ||
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