IR Wind Comparison

June-July 2003
Go to IR-WV Comparison

A qualitative comparison was done on infrared winds from two different satellites to find if coincident IR winds from each existed. If so, the vectors from the satellites were input to the matlab script, IRcomp.m, where each IR wind from the first satallite was compared with the IR winds from the second satellite.

IR winds from Sat 2 were found for each IR wind from Sat 1 within time, distance, and height [pressure] specified thresholds. RMS differences and normalized RMS differences in wind speed were computed for coincident winds that fell within these three thresholds. The mean distance, pressure, speed, direction, and time were also computed using this dataset of points within the thresholds.

Histograms are plotted of the wind speed differences with the frequency the value occurred and scatter plots are plotted of speed differences versus distance and pressure thresholds and direction differences. Distances, pressures and speeds are computed by subtracting Sat 2 winds from Sat 1 winds.

NOTE: Data is taken with a time threshold of 1 hr, distance threshold of 50 km and pressure threshold of 25 mb unless otherwise specified.

Day 189 Arctic

GOES data from Day 195

TERRA compared with AQUA, NOAA-15, NOAA-16, and NOAA-17

Satellite	# of points within thresholds	speed rms (m/s)	spd nrms	mean dist diff	mean pres diff	mean spd diff	mean dir diff	mean time diff
AQUA	3374	3.9	0.41	31.0	0.9	-0.1	1.3	0.42
NOAA-15	2090	3.7	0.30	30.3	-0.2	0.1	0.2	0.21
NOAA-16	588	3.6	0.30	30.1	-3.1	0.2	-2.0	0.24
NOAA-17 time thres 0.5	1623 545	3.8 3.3	0.26 0.33	30.6 29.9	-1.0 -0.5	-0.1 -1.0	-0.2 -0.3	0.44 0.24

Other Satellites Compared

Sat1/Sat2	# of points within thresholds	speed rms (m/s)	spd nrms	mean dist diff	mean pres diff	mean spd diff	mean dir diff	mean time diff
AQUA/ NOAA-16	2855	3.7	0.27	30.7	-1.7	-0.0	0.9	0.54
NOAA-15/ NOAA-17	250	3.0	0.20	28.4	0.7	-0.3	-1.0	0.27
GOES E/ GOES W	479	2.2	0.18	29.9	-0.0	-0.1	0.4	0.25

Histograms and Scatter Plots

TERRA vs NOAA-17

Speed Difference	Spd Diff vs Distance	Speed Diff vs Press Diff	Spd Diff vs Direction Diff

AQUA vs NOAA-16

Speed Difference	Spd Diff vs Distance	Speed Diff vs Press Diff	Spd Diff vs Direction Diff

NOAA-15 vs NOAA-17

Speed Difference	Spd Diff vs Distance	Speed Diff vs Press Diff	Spd Diff vs Direction Diff

TERRA vs AQUA

Speed Difference	Spd Diff vs Distance	Speed Diff vs Press Diff	Spd Diff vs Direction Diff

GOES E vs GOES W

Speed Difference	Spd Diff vs Distance	Speed Diff vs Press Diff	Spd Diff vs Direction Diff

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