2023-01-17: Mullion, Landsat 9 overpass

A Daily Validation Summary Report of the surface reflectance data collected on the date of 2023-01-17 by Geoscience Australia. 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)	2023-01-17 00:19:38 to 2023-01-17 01:03:27
Time of overpass (UTC)	2023-01-16 23:51:03
GPS quality	Good
Reference position	148.86264362E, 35.12279223S (WGS84)
Matchup quality	Good

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 as CSV

Band	Sat Mean	Sat rms	Field mean	Field rms
CA	0.034	0.002	0.027	0.004
blue	0.048	0.003	0.04	0.007
green	0.084	0.005	0.074	0.012
red	0.111	0.009	0.099	0.018
NIR	0.337	0.014	0.307	0.031
SWIR1	0.228	0.01	0.215	0.027
SWIR2	0.116	0.006	0.113	0.017

Figures

Click an image to view it at full size.

A satellite imagery tile of true colour (RGB) surface reflectance. It covers an area of approximately 2 km × 2 km. The white box indicates the size and location of the field site.

A band-by-band plot of surface reflectance for satellite and field data. 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.

A plot of Satellite Surface Reflectance 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.