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 procedure

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example 1

[0023] Such as figure 1 The illustrated method for measuring both outer and inner sides of large-scale aerial digital photography includes the following steps:

[0024] Step 1. Aerial photogrammetry and acquisition of photo control measurement data: DMC digital camera system and IMU / DGPS navigation and positioning technology are used for aerial photography flight and calibration field flight according to the preliminary design route, and GPS-RTK system, level and total station are used The instrument conducts field surveys, and obtains airborne GPS data, GPS ground base station data, calibration field measurement data, and ground photo control measurement data after the flight. The ground photo control measurement uses a sub-regional four-corner point measurement program;

[0025] Step 2. All-element data collection: Under the SSK all-digital photogrammetry workstation and DMS all-digital mapping system, the ground photo control measurement data obtained in the ab...

Example Embodiment

[0037] Example 2

[0038] Using the above method steps, we have completed a 1:1000 digital topographic map of about 1,100 square kilometers in cities such as Daya Bay, Xinxiang, Puyang, Baotou, Tongchuan and Hami.

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

[0040]

[0041]

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

Example Embodiment

[0043] Example 3

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

[0045] Table 4: Statistics of mathematical accuracy achieved by digital line plots of some measurement areas in recent years

[0046]

[0047] Comparing the data in Table 4 and Table 2, we can see 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 error in the point position is less than 0.5mm, and the error in the spacing is less than 0.4mm, the error in the elevation is within the urban measurement standard.

[0048] In aerial digital photogrammetry, the first-class quality elements of digital topographic map products are mathematical accuracy and attribute accuracy. Among them, mathematical accuracy is an important indicator of mapping and a rigid indicator of whether the mapping is qualified. According to the method steps of ...

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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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