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Two-outside and two-inside measuring method for large-scale aviation digital photography

A measurement method and aerial photography technology, applied in the field of aerial photogrammetry, can solve the problem that the mathematical accuracy of the mapping cannot well meet the requirements of the specification, and achieve the effect of obvious qualitative and positioning effects, high data accuracy, and shortening the period of aerial surveying and mapping.

Inactive Publication Date: 2010-06-02
XIAN MEIHANG INFORMATION IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Another serious problem arising from conventional aerial photogrammetry operating procedures is that the mathematical precision of the mapping cannot well meet the specification requirements

Method used

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  • Two-outside and two-inside measuring method for large-scale aviation digital photography
  • Two-outside and two-inside measuring method for large-scale aviation digital photography
  • Two-outside and two-inside measuring method for large-scale aviation digital photography

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Such as figure 1 A method of measuring both outside and inside for large-scale aerial digital photography shown includes the following steps:

[0024] Step 1. Aerial photogrammetry and acquisition of photo control measurement data: According to the preliminary design route, use DMC digital camera system and IMU / DGPS navigation and positioning technology to conduct aerial photography flight and calibration field flight, and use GPS-RTK system, level and total station After the flight, the airborne GPS data, GPS ground base station data, calibration field measurement data, and ground photo control measurement data are obtained. The ground photo control measurement adopts a regional four-corner point layout measurement scheme;

[0025] Step 2. All-element data collection: Under the SSK all-digital photogrammetry workstation and the DMS all-digital mapping system, perform air triangulation encryption on the ground photo control measurement data obtained in the above step 1 ...

Embodiment 2

[0038] With the above method and steps, we completed a 1:1000 digital topographic map of about 1100 square kilometers in Daya Bay, Xinxiang, Puyang, Baotou, Tongchuan and Hami.

[0039] Table 3: Accuracy statistics of digital topographic maps with a scale of 1:1000 completed in recent years

[0040]

[0041]

[0042] Comparing the data in Table 3 and Table 2, it can be seen that the above-mentioned digital topographic map is completed with a scale of 1:1000 using this method, and its accuracy can meet the requirements of urban survey specifications, that is, the errors in the points are all less than 0.5 mm, and the errors in the distances are all less than 0.4 mm, and the errors in elevation are all within 0.15m.

Embodiment 3

[0044] We also carry out 1:1000 or 1:500 digital topographic maps in other areas with the above method steps.

[0045] Table 4: Statistical Table of Mathematical Accuracy Achieved by Digital Line Drawings in Part of the Survey Area in Recent Years

[0046]

[0047] Comparing the data in Table 4 and Table 2, it can be seen that the accuracy of the above-mentioned 1:1000 or 1:500 digital topographic map completed by this method can meet the requirements of urban survey specifications, that is, the errors in points are all less than 0.5 mm, and the errors in spacing are all less than 0.5 mm. 0.4mm, and the errors in the elevation are all within the urban measurement norms.

[0048] In aerial digital photogrammetry, the primary quality elements of digital line-drawing topographic map products are mathematical accuracy and attribute accuracy. Among them, mathematical accuracy is an important index for mapping, and it is also a rigid index for whether the mapping is qualified. A...

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Abstract

The invention discloses a two-outside and two-inside measuring method for large-scale aviation digital photography, which comprises the following steps of: 1. carrying out aerial photogrammetry and obtaining photograph control measurement data; 2. acquiring total factor data and marking land features which do not reach the precision requirement of a finished picture during acquisition; 3. drawing, checking and supplementally measuring the data; playing back the total factor data acquired in the step 2 on a drawing base picture, carrying out gradual check and natural determination on the expressed land feature factors, modifying the data with incorrect and unclear expression by a method for marking the positioning distance and the auxiliary positioning data of the land features, supplementing omitted data and supplementally measuring the land feature which does not reach the precision requirement of the finished picture by the drawing method and is marked in the step 2; and 4. compiling data and converting a format. The invention solves the problems existing in the traditional measurement by the two-outside and two-inside operation process, therefore, the measured data has high precision, the photograph has high resolution ratio and the finished picture has high quality, and the measurement cost is reduced simultaneously.

Description

technical field [0001] The invention belongs to the technical field of aerial photogrammetry, and relates to an aerial digital photogrammetry method, in particular to a measurement method for large-scale aerial digital photography with two exteriors and two interiors. Background technique [0002] Aerial photogrammetry is an important technical means to quickly obtain geographic information. It is a way to measure and update national topographic maps and establish geographic information databases. It plays an irreplaceable role in the process of acquiring and updating spatial information, especially for large-scale and large-scale The acquisition and update of medium-scale data is inseparable from aerial photogrammetry. In the 21st century, with the introduction of aerial digital cameras, aerial photogrammetry space orientation and positioning technology is becoming more and more mature, coupled with the continuous improvement of the accuracy of the Global Positioning System...

Claims

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Application Information

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IPC IPC(8): G01C11/00G01C7/02
Inventor 白志刚何占国任为民马进苗小利李向莉余扬文原喜屯安军刘敏张新利
Owner XIAN MEIHANG INFORMATION IND
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