Spectral Reflectance Measurement Methodologies for Tuz Gölu Field Campaign

SPECTRAL REFLECTANCE MEASUREMENT METHODOLOGIES FOR TUZ GOLU FIELD CAMPAIGN Y. Boucher , F. Viallefont, A. Deadman, N. Fox , I. Behnert, D. Griffith, P. Harris, D. Helder, E. Knaeps, L. Leigh, Y. Li, H. Ozen, F. Ponzoni, S. Sterckx

Outline ,[object Object],[object Object],[object Object],[object Object]

Introduction ,[object Object],[object Object],[object Object],[object Object],[object Object]

Principle of field reflectance mesurement (1) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Meas. on the surface at t 1 Meas. on the reference at t 2

Principle of field reflectance mesurement (2) Possible compensation of irradiance temporal variation:  Measurement on the reference before and after measurement on the surface R ground = R ref x S ground (t 2 ) / S ref-mean with S ref-mean = [S ref (t 1 ) + S ref (t 3 ) ] / 2 Meas. on the surface at t 2 Meas. on the reference at t 1 Meas. on the reference at t 3

Principle of field reflectance mesurement (3) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],R D-H ref 8° IFOV R surface

Instrumentation for spectral reflectance measurements of Tuz Gölü site: Sensors ,[object Object],[object Object],FOV: 10° 5 bands (filter wheel) Calibrated in radiance 8° FOV  10-20 cm (depending on h) h 1.8-2.5µm 1-1.8µm 0.35-1µm Spectral domain InGaAs InGaAs CCD Detector 6.5nm 8.5nm 3nm Spectral resolution 2nm resamp 1nm 2nm resamp 1nm 1.4nm resamp 1nm Spectral sampling Sample: 10 spectra averaged Dark current: 25 spectra averaged Measure-ments 550 450 650 850 1500 nm

Instrumentation for spectral reflectance measurements of Tuz Gölü site: Reference panels ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Site description and spatial sampling of ground-based reflectance measurements ,[object Object],[object Object],[object Object],[object Object],AVNIR-2 acquisition image of Tuz Gölü site on 15 Aug 2010

Sampling strategies ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],etc etc etc 10 10 10 10

Spaced out sampling averaging several measurements on each point (1) ,[object Object],[object Object],[object Object],Strategy used by Onera for 300m x 100m areas 21 sampling points. Time of measurement: 1 hour For each sampling point: Optimization, Ref.x5, ground meas.x10, ref.x5 40 m 40 m 40 m 40 m 40 m 40 m 40 m 20m 30m 20m 20m 30m etc 10 10 10 10

Spaced out sampling averaging several measurements on each point (2) ,[object Object],[object Object],CSIR sampling for M3 300m x 100m area

Spaced out sampling averaging several measurements on each point (2) ,[object Object],[object Object],[object Object],INPE sampling for one 300m x 100m area

Spaced out sampling averaging several measurements on each point (2) ,[object Object],[object Object],[object Object],[object Object],Tübitak Uzay's sampling for one 300m x 100 m area

Spaced out sampling averaging several measurements on each point (2) ,[object Object],[object Object],[object Object],[object Object],[object Object],CMA's sampling for the M9 1km x 1km area

Spaced out sampling with local variability measurements ,[object Object],[object Object],Strategy used by VITO : for each sampling point: 5 ref., 4 points (4 meas. per point), 5 ref. Drawback : time consuming etc VITO's sampling strategy for the 300 m x 100 m areas (25 points) Sun Local measurements for each sampling point VITO's sampling strategy for the M9 1km x 1km area (11 points)

In-motion sampling (1) ,[object Object],[object Object],Advantage : high number of measurements are done in a short time Strategy used by SDSU : 20 meas. continuously acquired / 2.5m, averaged in one sample. 100 samples / row. 300m x 100m area measured in 30 minutes North Ref. panel meas. 8° FOV ~10cm x 2.5m

In-motion sampling (2) ,[object Object],[object Object],CSIR in-motion sampling for M3 300m x 100m area

In-motion sampling (2) ,[object Object],[object Object],[object Object],Onera in-motion sampling for M9 1km x 1km area

Results comparison (1) ,[object Object],[object Object],[object Object],[object Object],[object Object],M4 300m x 300m area reported reflectance

Results comparison (2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],M9 1km x 1km area reported reflectance

Conclusion ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Spectral Reflectance Measurement Methodologies for Tuz Gölu Field Campaign

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Spectral Reflectance Measurement Methodologies for Tuz Gölu Field Campaign