Statistical measures Sample Clauses

Statistical measures. Table 4-6 and Table 4-7 show results of the statistical data analysis for the CTX MSL DTM from UCL and UoS. As described above, the HRSC DTM was resampled to fit to the data to be validated. Due to the different resolutions delivered between UCL and UoS, there is a discrepancy in the number of pixel elements evaluated. The resampling of the HRSC DTM causes only a slight change in the statistics (cf. 2nd column of both tables). The UCL DTM (Table 4-6) has a minimum that is much higher in elevation in comparison to the HRSC DTM. However, since the average height value is comparable with the HRSC DTM value and differs by only 2 meters, it is assumed that this difference in minimum height value can be attributed to outliers in either of the data sets. A similar effect can be seen for the maximum DTM values. A similar cause for the differences between the DTMs as for the minimum heights is considered. The observed standard deviation for the UCL CTX DTM is higher compared to the HRSC DTM. This could be due to the pattern observed that introduces additional noise to the scene. Another source for the higher standard deviation could be the increased detail of the CTX DTM in comparison to HRSC leading to many variations of the same order of magnitude. Table 4-6: Statistical data of UCL MSL DTM HRSC DTM UCL DTM HRSC – UCL DTM Number of Elements: 7072512 7072512 7072480 Minimum [m]: -5339.23 -4983.46 -499.283 Maximum [m]: -993.202 -1000.06 691.821 Height range [m]: 4346.028 3983.4 1191.104 Average DN Value [m]: -3623.88 -3625.72 1.838 Standard Deviation [m]: 946.427 950.700 49.105 The UoS DTM for the MSL landing site area (Table 4-7) shows very similar statistical data in comparison to the UCL statistical data when looking at the maxima, minima and height range. Though the average height/DN value is larger than the reference height from the HRSC by 175 meters indicating that there is a height offset whereas the UoS DTM is located higher than the HRSC DTM. Table 4-7: Statistical data of UoS MSL DTM HRSC DTM UoS DTM HRSC – UoS DTM Number of Elements: 4011309 4011309 4011309 Minimum: -5339.97 -4810.84 -680.760 Maximum: -909.96 -735.67 519.560 Height range [m]: 4430.01 4075.17 1200.320 Average DN Value: -3616.79 -3440.37 -176.415 Standard Deviation: 957.845 958.532 49.716 An assessment was also carried out of the HiRISE DTM compared with the one from CTX. This is shown in Table 4-8. HiRISE and coincident CTX DTMs for the MSL test site. and displays a very small bias (≤0.5...
Sample 1
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Statistical measures. Table 4-3 and Table 4-4 show results of the statistical data analysis for the CTX MER-B DTM from UCL and UoS, respectively. As described above, the HRSC DTM was resampled to fit to the data to be validated. Due to the different resolutions delivered between UCL and UoS, there is a discrepancy in the number of pixel elements evaluated. The UCL DTM (Table 4-3) has a slightly lower minimum in comparison to the HRSC DTM while the height maximum differs by 400 metres with respect to the HRSC value. However, since the average height value is comparable with the HRSC DTM value and differs by only 26 metres, it is assumed that this maximum height value can be attributed to outliers in either of the two data sets. The observed standard deviation for the UCL CTX DTM is in the same order as for the HRSC DTM. It would be expected that the standard deviation also correlates with the data set resolution, however, the observed noise in parts of the scene will significantly contribute to this number. Table 4-3: Statistical data of UCL MER-B DTM HRSC DTM UCL DTM HRSC – UCL DTM Minimum [m]: -2445.93 -2458.73 -540.707 Maximum [m]: -1690.43 -1285.77 143.094 Height range [m]: 755.50 1172.96 683.801 Average DN Value [m]: -1946.81 -1972.58 25.7694 Standard Deviation [m]: 129.835 122.475 22.8423 The UoS DTM (Table 4-4) on the other hand shows a much larger difference in minimum/ maximum height values and consequently has a much larger range of heights in comparison to the HRSC DTM. The source is seen in the bowl shape of the DTM and the noise in the central parts that have been observed in the colour overlay and the shaded relief. The average of the height values of both DTMs differs by about 150 metres indicating that the UoS DTM is on average 150 meters lower than the HRSC DTM. Table 4-4: Statistical data of UoS MER-B DTM HRSC DTM UoS DTM HRSC – UoS DTM Number of Elements: 2493197 2493197 2493197 Minimum: -2445.87 -2702.33 -951.115 Maximum: -1690.14 -911.927 651.683 Height range [m]: 755.73 1790.40 1602.798 Average DN Value: -1949.88 -1801.35 -148.529 Standard Deviation: 130.911 132.611 35.2642 Table 4-5: Statistical intercomparison of UCL CTX and HiRISE DTMs CTX DTM HiRISE DTM CTX – HiRISE DTM Number of Elements: 53,853,617 53,853,617 53,853,137 Height range [m]: 81.07 338.44 352.922 Average Height [m]: -1883.53 -1883.57 0.0468 Standard Deviation [m]: 10.317 11.401 7.745 The HiRISE DTM is compared with the corresponding CTX DTM and is shown in Table 4-5. The average height dif...
Sample 1

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