2021-11-15 WLC: Wilcannia, Landsat 8 and Landsat 9 dual overpass

This is a report of the field data collected on 15 November 2021 at the location of Wilcannia to validate the satellite data of the Landsat 8 and Landsat 9 dual overpass. The full collection of data is contained in the National Spectral Database. Satellite data can be found on DEA maps.

Variables

These variables and environmental factors were present on the day the data were collected.

Instrument(s) used	ASD FR4 (18179/3)
Time of field site measurements (UTC)	2021-11-15 00:04:33 to 2021-11-15 00:41:26
Time of Landsat 8 overpass (UTC)	2021-11-15 00:14:34
Time of Landsat 9 overpass (UTC)	2021-11-15 00:13:57
GPS quality	Good
Reference position	143.82192228E, 31.4493214S (WGS84)
Matchup quality for Landsat 8	Excellent
Matchup quality for Landsat 9	Excellent

Results

The surface reflectance statistics collected on this day are grouped into bands. This allows the data to be used to validate Geoscience Australia’s other datasets that use the same standardised bands.

Download results as CSV

Results of Field data versus Landsat 8 Satellite

Band	Sat Mean	Sat rms	Field mean	Field rms
CA	0.107	0.005	0.095	0.012
blue	0.122	0.006	0.11	0.015
green	0.16	0.007	0.148	0.02
red	0.188	0.009	0.174	0.024
NIR	0.269	0.009	0.255	0.026
SWIR1	0.301	0.01	0.292	0.031
SWIR2	0.267	0.009	0.262	0.031

Results of Field data versus Landsat 9 Satellite

Band	Sat Mean	Sat rms	Field mean	Field rms
CA	0.107	0.005	0.095	0.012
blue	0.122	0.006	0.11	0.015
green	0.159	0.007	0.148	0.019
red	0.188	0.009	0.174	0.024
NIR	0.269	0.009	0.255	0.026
SWIR1	0.303	0.01	0.292	0.031
SWIR2	0.265	0.009	0.262	0.031

Figures

The following figures provide visual representations of the data. (Click a figure to view it at full size.)

Satellite imagery tiles of true colour (RGB) surface reflectance. They each cover an area of approximately 2 km × 2 km. The white box indicates the size and location of the field site.

Band-by-band plots of surface reflectance for field data versus each satellite. Satellite uncertainty error bars for each band are the standard deviation of pixel values over and surrounding the field site. Field uncertainty error bars are the standard deviation of values after averaging all spectra within the same satellite pixels.

Plots of Satellite Surface Reflectance for each satellite versus Field Site Surface Reflectance on this day. The solid line represents the one-to-one equality between field and satellite measurements. The black dots are the values from all field site measurements prior to this date. The line of best fit is not shown, but its parameters are given in the bottom-right corner.