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| 1 | +# 2025-12-03 NSW2: Transect NSW Site 2, Landsat 8 and Sentinel-2B dual overpass |
| 2 | + |
| 3 | +This is a report of the field data collected on 3 December 2025 at the location of Transect NSW Site 2 |
| 4 | +to validate the satellite data of the Landsat 8 and Sentinel-2B dual overpass. |
| 5 | +The full collection of data is contained in the [National Spectral Database](https://www.ga.gov.au/scientific-topics/dea/dea-data-and-products/national-spectral-database). |
| 6 | +Satellite data can be found on [DEA maps](https://maps.dea.ga.gov.au/#share=s-i2o7JwB5gvXOQefhMmTLJaA14b0). |
| 7 | + |
| 8 | +:::{contents} In this report |
| 9 | +:local: |
| 10 | +:backlinks: none |
| 11 | +::: |
| 12 | + |
| 13 | +## Variables |
| 14 | + |
| 15 | +These variables and environmental factors were present on the day the data were collected. |
| 16 | + |
| 17 | +:::{csv-table} |
| 18 | +:class: validation-report-variables-table |
| 19 | + |
| 20 | +"Instrument(s) used","SR-3500_20680T1" |
| 21 | +"Time of field site measurements (UTC)","2025-12-03 05:30:04 to 2025-12-03 05:56:53" |
| 22 | +"Time of Landsat 8 overpass (UTC)", 2025-12-03 00:20:38 |
| 23 | +"Time of Sentinel-2B overpass (UTC)", 2025-12-03 00:35:32 |
| 24 | +"GPS quality","Good" |
| 25 | +"Reference position","143.48308167E, 31.596075S (WGS84)" |
| 26 | +"Matchup quality for Landsat 8","Excellent" |
| 27 | +"Matchup quality for Sentinel-2B","Excellent" |
| 28 | +::: |
| 29 | + |
| 30 | +## Results |
| 31 | + |
| 32 | +The surface reflectance statistics collected on this day are grouped into bands. |
| 33 | +This allows the data to be used to validate Geoscience Australia's other datasets that use the same standardised bands. |
| 34 | + |
| 35 | +```{eval-rst} |
| 36 | +.. container:: |
| 37 | +
|
| 38 | + :download:`Download results as CSV <./SiteValidationResults-2025-12-03-NSW2.csv>` |
| 39 | +``` |
| 40 | + |
| 41 | +:::{csv-table} Results of Field data versus Landsat 8 Satellite |
| 42 | +:class: validation-report-results-table |
| 43 | + |
| 44 | +"Band","Sat Mean","Sat rms","Field mean","Field rms" |
| 45 | +"CA","0.052","0.001","0.049","0.005" |
| 46 | +"blue","0.065","0.001","0.063","0.006" |
| 47 | +"green","0.12","0.005","0.121","0.018" |
| 48 | +"red","0.216","0.013","0.223","0.038" |
| 49 | +"NIR","0.29","0.014","0.302","0.037" |
| 50 | +"SWIR1","0.423","0.012","0.447","0.042" |
| 51 | +"SWIR2","0.348","0.012","0.371","0.046" |
| 52 | +"CA","0.111","0.003","0.111","0.012" |
| 53 | +"blue","0.13","0.003","0.131","0.015" |
| 54 | +"green","0.173","0.005","0.17","0.02" |
| 55 | +"red","0.215","0.006","0.212","0.024" |
| 56 | +"NIR","0.272","0.006","0.267","0.028" |
| 57 | +"SWIR1","0.342","0.004","0.347","0.027" |
| 58 | +"SWIR2","0.296","0.004","0.304","0.024" |
| 59 | +::: |
| 60 | + |
| 61 | +:::{csv-table} Results of Field data versus Sentinel-2B Satellite |
| 62 | +:class: validation-report-results-table |
| 63 | + |
| 64 | +"Band","Sat Mean","Sat rms","Field mean","Field rms" |
| 65 | +"CA","0.058","0.001","0.049","0.005" |
| 66 | +"blue","0.072","0.001","0.067","0.007" |
| 67 | +"green","0.122","0.004","0.117","0.017" |
| 68 | +"red","0.23","0.012","0.229","0.039" |
| 69 | +"RE1","0.26","0.012","0.256","0.041" |
| 70 | +"RE2","0.275","0.013","0.277","0.042" |
| 71 | +"RE3","0.288","0.013","0.291","0.041" |
| 72 | +"NIR1","0.3","0.013","0.298","0.039" |
| 73 | +"NIR2","0.3","0.011","0.302","0.038" |
| 74 | +"SWIR2","0.433","0.01","0.448","0.042" |
| 75 | +"SWIR3","0.359","0.01","0.37","0.046" |
| 76 | +"CA","0.115","0.001","0.11","0.012" |
| 77 | +"blue","0.14","0.005","0.134","0.015" |
| 78 | +"green","0.175","0.007","0.167","0.019" |
| 79 | +"red","0.223","0.008","0.212","0.025" |
| 80 | +"RE1","0.24","0.007","0.226","0.026" |
| 81 | +"RE2","0.25","0.007","0.237","0.027" |
| 82 | +"RE3","0.261","0.007","0.248","0.027" |
| 83 | +"NIR1","0.275","0.009","0.259","0.027" |
| 84 | +"NIR2","0.278","0.007","0.264","0.028" |
| 85 | +"SWIR2","0.348","0.005","0.344","0.027" |
| 86 | +"SWIR3","0.3","0.004","0.3","0.024" |
| 87 | +::: |
| 88 | + |
| 89 | +## Figures |
| 90 | + |
| 91 | +The following figures provide visual representations of the data. (Click a figure to view it at full size.) |
| 92 | + |
| 93 | +:::::{grid} 1 1 2 3 |
| 94 | +::::{grid-item} |
| 95 | +:::{figure} ./RGB-2025-12-03-NSW2.png |
| 96 | + |
| 97 | +Satellite imagery tiles of true colour (RGB) surface reflectance. |
| 98 | +They each cover an area of approximately 2 km × 2 km. |
| 99 | +The white box indicates the size and location |
| 100 | +of the field site. |
| 101 | +::: |
| 102 | +:::: |
| 103 | +::::{grid-item} |
| 104 | +:::{figure} ./SiteComparison-2025-12-03-NSW2.png |
| 105 | + |
| 106 | +Band-by-band plots of surface reflectance for field data versus each satellite. |
| 107 | +Satellite uncertainty error bars for each band are the standard deviation |
| 108 | +of pixel values over and surrounding the field site. |
| 109 | +Field uncertainty error bars are the standard deviation of values after |
| 110 | +averaging all spectra within the same satellite pixels. |
| 111 | + |
| 112 | +::: |
| 113 | +:::: |
| 114 | +::::{grid-item} |
| 115 | +:::{figure} ./OverallComparison-2025-12-03-NSW2.png |
| 116 | + |
| 117 | +Plots of Satellite Surface Reflectance for each satellite versus Field Site Surface Reflectance on this day. |
| 118 | +The solid line represents the one-to-one equality between field and satellite measurements. |
| 119 | +The black dots are the values from all field site measurements prior to this date. |
| 120 | +The line of best fit is not shown, but its parameters are given in the bottom-right corner. |
| 121 | + |
| 122 | +::: |
| 123 | +:::: |
| 124 | +::::: |
| 125 | + |
| 126 | +% :::{tags} validation, site_validation, mullion_validation, landsat_8_validation |
| 127 | +% ::: |
| 128 | + |
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