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High resolution image laser radar vertical control point extracting and auxiliary positioning method

A technology of elevation control point and laser radar, which is applied in the direction of electromagnetic wave re-radiation, measuring devices, instruments, etc., can solve the problems of low density of laser height measurement and improvement of precision elevation accuracy, and achieve the effect of overcoming bottlenecks and improving positioning accuracy

Active Publication Date: 2017-07-18
CHINESE ACAD OF SURVEYING & MAPPING
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Problems solved by technology

[0022] From the existing status, it can be seen that the DSM generated from stereo remote sensing images can obtain high ground resolution, but under the condition of no or few ground control points, the accuracy, especially the elevation accuracy, encounters a bottleneck problem
Although the height measurement laser radar has ideal elevation accuracy, the laser height measurement density is very low and cannot be directly used for DSM and DEM product generation.

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  • High resolution image laser radar vertical control point extracting and auxiliary positioning method
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  • High resolution image laser radar vertical control point extracting and auxiliary positioning method

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Embodiment Construction

[0065] The invention utilizes the data of the laser altimeter sensor to assist in improving the ground positioning accuracy of the remote sensing image of the high-resolution sensor, especially the elevation accuracy. Positioning model, solving orientation parameters and encrypted points, improving the positioning accuracy of the image, especially the elevation accuracy. Specifically, it is realized through the following steps:

[0066] Step 1 uses conventional methods to perform block or free network adjustment on high-resolution remote sensing images in the survey area to obtain preliminary refined orientation parameters of each scene image, which are used as initial values ​​for image processing in subsequent steps 2 to 6.

[0067] Step 2 Select the high-resolution image for laser spot area extraction: select the high-resolution image obtained from the same platform of the altimetry lidar sensor at the same or similar time, and select the image that overlaps with the laser ...

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Abstract

The invention provides a high resolution image laser radar vertical control point extracting and auxiliary positioning method. The method has a core that high resolution remote sensing image vertical control points and image control points are extracted through combined treatment of height measurement laser radar data and high resolution image data and improvement of high resolution image positioning precision is realized through constructing a high resolution image positioning model having elevation restriction. According to the invention, with the support of the height measurement laser radar data, stereoscopic positioning precision of the high resolution remote sensing images and high resolution image mapping product precision are improved distinctively.

Description

technical field [0001] The invention relates to the fields of high-resolution remote sensing image photogrammetry, data matching, joint processing of multi-source remote sensing data, etc., and in particular to a high-resolution image laser radar elevation control point in the field of joint processing of laser radar data and high-resolution remote sensing image data Extraction and its assisted positioning method. Background technique [0002] After decades of rapid development, satellite remote sensing data has formed from Landsat series (80m)-TM (30m)-SPOT1 / 2 / 4 (10m) to SPOT5HRS (10×5m)-SPOT5HRG (2.5m )-IKONOS (1.0m)-QuickBird (0.6m) with various resolutions, multi-temporal, high signal-to-noise ratio, high geometric and radiometric resolution (greater than 8 bits / pixel), global coverage of image sequences, for resource development , ecological environment protection and socio-economic planning to provide the necessary geospatial information. [0003] The geometric posit...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G01S17/02
CPCG01S17/86G06V20/13
Inventor 程春泉左志权黄国满张继贤张力
Owner CHINESE ACAD OF SURVEYING & MAPPING
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