增强分辨率SMAP亮度温度图像产品的有效分辨率评价

D. Long, M. Brodzik, M. Hardman
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引用次数: 2

摘要

校准的增强分辨率被动微波日等面积可扩展地球网格2.0亮度温度(CETB)地球系统数据记录(ESDR)包括标准兼容网格上的常规分辨率和增强分辨率辐射计亮度温度(tb)图像,这些图像来自校准的卫星辐射计测量数据,收集了几十年的时间。最近,CETB团队处理了前4年的增强分辨率土壤湿度主被动(SMAP) l波段(1.41 GHz)辐射计TB图像。CETB处理采用辐射计形式的散射图像重建(rSIR)算法来创建增强分辨率的图像,这些图像被张贴在精细分辨率网格上。本文利用海岸线和岛屿交叉点对SMAP T - B图像产品的有效分辨率进行了评价。我们同样评估了基于Backus-Gilbert处理的SMAP L1C_TB_E增强分辨率产品的有效分辨率。我们将rSIR和L1C_TB_E增强分辨率产品的空间分辨率与常规处理(网格化)SMAP数据进行了比较。我们发现每日CETB rSIR SMAP TB图像的有效分辨率略高于L1C_TB_E,比常规处理数据的有效分辨率高30%左右。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluating the effective resolution of enhanced resolution SMAP brightness temperature image products
The MEaSUREs Calibrated Enhanced-Resolution Passive Microwave Daily Equal-Area Scalable Earth Grid 2.0 Brightness Temperature (CETB) Earth System Data Record (ESDR) includes conventional- and enhanced-resolution radiometer brightness temperature (T B ) images on standard, compatible grids from calibrated satellite radiometer measurements collected over a multi-decade period. Recently, the CETB team processed the first 4 years of enhanced resolution Soil Moisture Active Passive (SMAP) L-band (1.41 GHz) radiometer T B images. The CETB processing employs the radiometer form of the Scatterometer Image Reconstruction (rSIR) algorithm to create enhanced resolution images, which are posted on fine resolution grids. In this paper, we evaluate the effective resolution of the SMAP T B image products using coastline and island crossings. We similarly evaluate the effective resolution of the SMAP L1C_TB_E enhanced resolution product that is based on Backus-Gilbert processing. We present a comparison of the spatial resolution of the rSIR and L1C_TB_E enhanced resolution products with conventionally-processed (gridded) SMAP data. We find that the effective resolution of daily CETB rSIR SMAP T B images is slightly finer than that of L1C_TB_E and about 30% finer than conventionally processed data.
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