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A Method of Orthorectification for CCD Image of Environment-1 Satellite

An orthorectification and image technology, applied in the field of image processing, can solve the problems of HJ satellite images without a strict model and not suitable for HJ satellite images, etc., to avoid leakage of relevant information, avoid uneven distribution of errors, and improve confidentiality. Effect

Active Publication Date: 2021-08-27
CHINA CENT FOR RESOURCES SATELLITE DATA & APPL
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Problems solved by technology

However, the HJ satellite image distributed by the HJ satellite image supplier does not have a strict model, so the method of calculating rational polynomial coefficients using a strict model is not suitable for HJ satellite image

Method used

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  • A Method of Orthorectification for CCD Image of Environment-1 Satellite
  • A Method of Orthorectification for CCD Image of Environment-1 Satellite
  • A Method of Orthorectification for CCD Image of Environment-1 Satellite

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Embodiment

[0044]1. Import the HJ star CCD primary image with the file name HJ1A-CCD1-8-84-20130414.

[0045] 2. Import the elevation data and reference data of Environment-1 satellite. The quality of the elevation data and reference data directly affects the accuracy of the orthophoto results. The selection principle is that the grid spacing of the elevation data should not be greater than five times the resolution of the CCD image of the HJ star. Not less than the resolution of the CCD image of the HJ star. The resolution of the reference data should not be greater than or less than four times the resolution of the CCD image of the HJ star. The elevation data used in this example is the 90-meter grid spacing SRTM (Space Shuttle Radar Topographic Mapping Mission) released by NASA, and the reference data is the 15-meter resolution LandSat (Land Satellite) released by NASA Panchromatic ortho data.

[0046] 3. Evenly collect 81 ground control points on the HJ1A-CCD1-8-84-20130414 image an...

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Abstract

A method for orthorectification of the CCD image of the Environment-1 satellite. First, import the HJ star CCD first-level image and the corresponding elevation data and reference data, and then uniformly collect ground control points on each HJ star CCD first-level image. The coordinates of the control points are imported into the cubic rational function model, and the rational polynomial coefficient (RPC) is calculated to obtain the corresponding rational function model, and then the pixel coordinates of all points in the first-level CCD image of the Environment-1 satellite are input into the rational function model to obtain Corresponding to the coordinates of each point of the orthorectified image, and then adopting the bilinear interpolation method to interpolate the gray value of each point of the corrected image to the point whose pixel coordinates are the entire row and column, and obtain the orthorectified image. Compared with the traditional polynomial method, the method of the invention can obtain higher precision.

Description

technical field [0001] The invention relates to a CCD image orthorectification method, in particular to an orthorectification method for the CCD sensor image of the Environment-1 satellite, which is suitable for the orthorectification of the CCD image of the Environment-1 satellite, and belongs to the technical field of image processing. Background technique [0002] Satellites A and B of Environment-1 were launched in Taiyuan on September 6, 2008. The two satellites A and B are each equipped with two CCD cameras with a resolution of 30 meters and a width of 360 kilometers. The two-star collaboration can achieve a two-day return cycle. Due to its high time resolution, good macroscopic properties, and multi-scale characteristics, the satellite has broad application prospects in environmental and disaster monitoring and assessment. [0003] The HJ star CCD image covers about 360 kilometers, and its huge width leads to serious geometric distortion of the HJ CCD image. From th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
Inventor 黄世存韩启金曾湧潘志强王奇
Owner CHINA CENT FOR RESOURCES SATELLITE DATA & APPL
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