https://ogma.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:50901 Wed 15 May 2024 15:33:39 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:55015 Wed 03 Apr 2024 11:15:39 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36568 7 km offshore. The main improvement of BP retracker occurs for distance ≤7 km to the coastline, where validation results indicate that data retracked by BP are more accurate (15–21 cm) than those by ALES (16–24 cm) and MLE4 (19–37 cm).]]> Tue 09 Jun 2020 11:33:41 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36567 Tue 09 Jun 2020 11:26:42 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:43847 0.8) in the 0–5 km distance band, indicating that coastal sea-level data are useful for applications such as estimation of river plumes, long-term variation of water level in lakes and rivers, and the analysis of storm surges]]> Tue 04 Oct 2022 11:53:33 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:40002 Tue 04 Jul 2023 16:22:38 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36577 Thu 10 Sep 2020 16:30:53 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:38569 0.74. The results of this paper suggest that the official ICE retracker for LRM data and APD-PPT retracker for SARIn-mode waveforms are the most appropriate retrackers over Dianchi Lake and TP lakes, respectively. The trend estimates of the time series derived by both retrackers are 61.0 ± 10.8 mm/yr for Gemang Co and Zhangnai Co in TP, and 30.9 ± 64.9 mm/yr for Dianchi Lake, indicating that the lake levels over three lakes were continuously rising over the study period. The results of this study show that CryoSat-2 SARIn-mode data can be used for monitoring many small lakes that have not been measured by other altimetry missions in TP.]]> Thu 04 Nov 2021 16:25:08 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:48237 Thu 02 Nov 2023 14:42:55 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:44138 10 km from the coast, the noise level of 1 Hz Sentinel-3A SLAs (~1.2 cm) is lower than that of the MBP-retracked Jason-3 SLAs (~1.7 cm). Moreover, the noise level of 2 Hz Sentinel-3A SLAs is comparable to that of the 1 Hz MBP-derived Jason-3 dataset, indicating that Sentinel-3A can provide precise SLAs at finer spatial scales. The Root Mean Square Error (RMSE) of differences between the tide gauge SLA time series and the equivalent SLA time series at each along-track altimeter point was used to assess pointwise data quality. For both Sentinel-3A and MBP-retracked Jason-3, the along-track RMSEs of 20 Hz SLAs vary between 0.05 m and 0.2 m. The mean and standard deviation (STD) of 1 Hz SLA differences at crossover points were computed for each individual altimetry mission to assess overall data quality. When compared with the crossover analysis results, the quality of Sentinel-3A SLAs is superior to that of the retracked Jason-3 dataset in terms of smaller STDs at crossover points (8.8 cm vs. 10.7 cm).]]> Sat 08 Oct 2022 12:43:53 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:41066 in situ anemometer and Jason-2 official altimeter product. The along-track root mean square errors (RMSEs) and biases between altimeter and anemometer wind speed time series are calculated pointwise to evaluate the data quality. The orthogonal regression analysis is computed to evaluate the overall data quality. The validation results show that the BP-derived backscatter coefficients are highly correlated with the square of the off-nadir angles. By removing this correlation-induced error, the quality of BP-derived backscatter coefficients is comparable to that obtained from the three-parameter maximum likelihood estimator (MLE3). The improved backscatter coefficients are beneficial for retrieving reliable along-track wind speed observations, which allows for lower and smoother RMSEs and biases. The 1- and 2-Hz BP-derived wind speeds achieve similar performance, implying that the application of high rate altimeter wind speeds in coastal zones is possible. We also find that the altimeter wind speeds are significantly dependent on the sea state in the last 20-km distance to the coast, where the bias between altimeter and anemometer wind speeds increases remarkably and varies inversely with the offshore distance.]]> Fri 22 Jul 2022 10:04:21 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:49372 Fri 12 May 2023 13:38:02 AEST ]]>