Evaluation method of TM/ETM (thematic mapper/enhanced thematic mapper) and image-based atmospheric correction product quality

Abstract

The invention relates to an evaluation method of quality of a TM/ETM (thematic mapper/enhanced thematic mapper) and image-based atmospheric correction product. The method comprises the following steps of: 1, acquiring a product image, and randomly selecting a reference image; 2, matching a geographic coordinate system between the product image and the reference image in the step 1; 3,selecting a plurality of samples from the product image and the reference image by adopting a systematic sampling method, and respectively calculating spectral values of corresponding samples of the product image and reference image on the reference image and the product image; 4, respectively identifying constant land feature samples of the product image and the reference image in the step 2, and saving an effective constant land feature sample; and 5, analyzing the atmospheric correction quality of the product image according to the effective constant land feature sample in the step 4. The method has the advantages that: important basic image quality information can be provided to regional or global earth surface change researches, and PIFs (physical interfaces) samples can be accurately identified on the TM/ETM and image with different time phases/season phases.

Description

technical field [0001] The invention relates to a product quality evaluation method, in particular to a TM / ETM+ image atmospheric correction product quality evaluation method. Background technique [0002] TM / ETM+ images obtained by Landsat have become important basic data for studying global / regional changes due to their moderate resolution and long-term continuous earth observation, and have been widely used in many fields. However, the absorption and scattering of solar radiation by water vapor, ozone, and aerosols contained in the atmosphere affect the usability of remote sensing images. It is usually necessary to use physical radiative transfer models or statistical methods to remove atmospheric effects to obtain true surface reflectance. Gas correction The correction model and atmospheric environment parameters used contain many uncertain factors, which lead to certain uncertainties in the surface reflectance products obtained by inversion, and affect the extraction ac...

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Problems solved by technology

[0006] Another purpose of the present invention is to solve the problems existing in the prior art that the atmospheric correction products of TM / ETM+ images obtained before cannot be evaluated for quality, and the differences between MODIS images and TM / ETM+ images in terms of spatial resolution, projected coordinate system, etc. To a certain extent, technical issues such as adverse effects on the quality evaluation results are also provided; a method for automatic identification of PIFs samples oriented to product quality evaluation is provided, which can compare TM / ETM+ images with different phases / seasons A TM / ETM+ Image Atmospheric Correction Product Quality Evaluation Method for Accurately Identifying PIFs Samples

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