Name
Title | ||
|---|---|---|
Sensitivity of off-nadir zenith angles to correlation between visible and near-infrared reflectance for use in remote sensing of aerosol over land |
Abstract | ||
|---|---|---|
Cloud absorption radiometer (CAR) multispectral and multiangular data, collected during the Smoke, Clouds, and Radiation-Brazil (SCAR-B) Experiment, was used to examine the ratio technique, the official method for remote sensing of aerosols over land from the moderate resolution imaging spectroradiometer (MODIS) data, for view angles from nadir to 65 off-nadir. The strategy we used is to first select a pristine, low aerosol optical thickness flight, and we then computed ratios of reflectance at 0.47 and 0.68 m to corresponding values at 2.20 m, separately for backward and forward scattering directions. Similarly, we ana- lyzed data from high turbidity flights for comparison purposes. For both flights, we removed the effects of atmospheric absorption and scattering using 6S, a radiative transfer code, and then recom- puted the ratios again for different values of aerosol optical thick- ness. Finally, we analyzed bidirectional reflection function (BRF) data to examine the dependence of the ratio technique on the rela- tive azimuth angle. Results of this analysis show that a relationship between visible reflectance and near infrared (IR) reflectance ex- ists for view angles from nadir to 40 off-nadir, and that simple parametric relationships can be derived. In spite of these observed relationships, the relationship 4, used in remote sensing of aerosol over land, does not seem to hold for the cases tested, both in the forward and backward scattering directions and that 2 seems to hold for view angles from nadir to 45 off-nadir but only in the backward scattering direction. These ratios show little variation with azimuth view angle and this seems to hold well for backward scattering directions over dark targets. |
Year | DOI | Venue |
|---|---|---|
2001 | 10.1109/36.917901 | IEEE T. Geoscience and Remote Sensing |
Keywords | Field | DocType |
aerosols,atmospheric composition,atmospheric techniques,remote sensing,350 to 2200 nm,IR,aerosol,atmosphere,bidirectional reflection function,cloud absorption radiometer,infrared,measurement technique,meteorology,multispectral method,near-infrared reflectance,off-nadir zenith angle,optical method,optical thickness,remote sensing,visible | Nadir,Atmospheric correction,Moderate-resolution imaging spectroradiometer,Optical depth,Remote sensing,Optics,Radiometry,Radiative transfer,Mathematics,Zenith,Radiometer | Journal |
Volume | Issue | ISSN |
39 | 4 | 0196-2892 |
Citations | PageRank | References |
5 | 1.37 | 5 |
Authors | ||
6 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Charles K. Gatebe | 1 | 38 | 7.41 |
| Michael D. King | 2 | 361 | 292.12 |
| Si-Chee Tsay | 3 | 69 | 18.73 |
| Q. Ji | 4 | 5 | 1.37 |
| G. Thomas Arnold | 5 | 11 | 2.99 |
| Jason Y. Li | 6 | 5 | 1.37 |