CN103759720A - Digital point-pricking method for aerial survey field work - Google Patents
Digital point-pricking method for aerial survey field work Download PDFInfo
- Publication number
- CN103759720A CN103759720A CN201310582090.5A CN201310582090A CN103759720A CN 103759720 A CN103759720 A CN 103759720A CN 201310582090 A CN201310582090 A CN 201310582090A CN 103759720 A CN103759720 A CN 103759720A
- Authority
- CN
- China
- Prior art keywords
- control point
- point
- photo control
- field
- digital
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C15/00—Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
- G01C15/02—Means for marking measuring points
Abstract
The invention provides a digital point-pricking method for aerial survey field work. The digital point-pricking method for aerial survey field work is characterized by comprising at least the following steps: step 101, interior work point selection module: arranging a sufficient number of alternative image control points covering a detection area, and introducing approximate coordinates of digital aerial images and the alternative image control points into the field digital point-pricking equipment; and step 102: field work point selection module: by means of the field digital point-pricking equipment, marking final image control point information of all alternative image control points selected in the step 101 at the corresponding sites in the digital aerial image, and setting up an instrument to determine a ground coordinate (i) Po (X, Y, H) (/i). The digital point-pricking method for aerial survey field work can improve the efficiency and precision of point-pricking work and enhance the universality and convenience of working.
Description
Technical field
The present invention relates to a kind of aerophotogrammetric field work digitizing thorn point methods.
Background technology
The operation foundation that thorn point achievement in photogrammetric measurement field operation is encrypted as interior industry empty three, its precision directly determines follow-up photogrammetric office work measuring accuracy; In addition, the defective meeting of thorn point causes does over again, thereby causes claim for eot, and engineering cost increases, and the work of thorn point does not complete and can cause interior industry work to start, thereby extends integrated engineering progress.
The thorn point operation main task of aerophotogrammetric field work: lay to cover and survey the alternative photo control point of district's sufficient amount, determine after alternative photo control point particular location at the scene, obtain each photo control point
ptaccurate photo control point information and field ground coordinate on digital aviation image
po(XYH).
The key step that the tradition thorn of tradition aerophotogrammetric field work is selected work pattern is: 1., industry is developed and printed out papery aviation image as thorn spot film; 2. according to degree of overlapping, on thorn spot film, draw a circle to approve alternative photo control point general location; 3. technician determines effective atural object at the scene according to the photo control point reconnaissance condition in < < 1:500 1:1000 1:2000 topomap photogrammetric measurement field operation standard > > (GB/T 7931-2008); 4. after selecting by magnifier, with embroidery needle, on photo, sting a pin hole (diameter is not more than 0.1mm), and described with the form of " description of station ", set up afterwards instrument, measure this and put accurate coordinate value on the spot.There is the defect of following several respects in tradition thorn point methods: 1. strict because of photo control point reconnaissance condition, and require operator to possess higher profession basis and experience, be difficult for Technique Popularizing.2. because papery photo cannot amplify, microcosmic landform is difficult to accurate demonstration, and thorn point exists skew, and indivedual somes position thorn point tolerance transfinites and easily does over again.3. in landform and road complex area, arrive at design scene, photo control point position comparatively consuming time.4. traditionally on paper achievement is easily damaged, Portable belt not, and in the passback of field operation achievement, industry speed is slow.
Summary of the invention
The object of this invention is to provide a kind of thorn point operating efficiency and precision of improving, strengthen the aerophotogrammetric field work digitizing thorn point methods of operation popularization and convenience.
The object of the invention is to realize by following technical method, aerophotogrammetric field work digitizing thorn point methods, is characterized in that: at least comprise the steps:
Step 101: interior industry reconnaissance module: lay to cover and survey the alternative photo control point of district's sufficient amount, and digital aviation image and alternative photo control point rough coordinates are imported to digital field thorn point device;
Step 102: field operation reconnaissance module: by digital field thorn point device, at the selected corresponding scene of all alternative photo control point of step 101, demarcate final photo control point information on digital aviation image, and set up its ground coordinate of Instrument measuring
po(X, Y, H).
Industry reconnaissance module in described step 101, at least comprises the steps:
Step 201: data is prepared, and aviation image is sorted according to air strips;
Step 202: according to photo control point reconnaissance principle in photogrammetric measurement field operation national standard, demarcate each alternative photo control point in the sheet reconnaissance program of choosing of self-service exploitation
ptsummary region;
Step 203: demarcate each alternative photo control point in Google Earth
ptgeneral location is also derived the terrestrial coordinate under its WGS84 ellipsoid
pt(B, L, H);
Step 204: all alternative photo control point terrestrial coordinates are imported to handhold GPS;
Step 205: assembling digital field thorn point device, connects connecting line assurance panel computer and hand-held set GPS communication normal;
Step 206: take digital aviation image as base map in panel computer, use handhold GPS to navigate to summary scope;
Step 207: sting in the field of independent development in some program and load the rear aviation image of corresponding correction as base map, the local terrestrial coordinate simultaneously receiving in real time in read step 206
ph(B, L, H), according to what show in real time on base map
ph(B, L, H), select to arrive at
pt(B, L, H)best traffic route;
Step 208: arrive at
pt(B, L, H)scene, in thorn point program, the digital aviation image of Zoom in, behind selected accurately some position, determines and records three some position information: 1. demarcating accurate some position on photo in the wild
pt(x, y); 2. description of station is described; 3. gather this site work photo;
Step 209: at accurate photo control point
ptits ground coordinate of Instrument measuring is set up at corresponding scene
po(X, Y, H);
Step 210: by photo control point
ptground coordinate
po(X, Y, H)as the information storage of the 4th of the some position described in step 208;
Step 211: in returning by wireless network as control Measurement results, industry is for aerotriangulation.
In described step 202, choose sheet reconnaissance program and at least comprise the steps:
Step 301: according to image information and engineering attribute, set up and survey district's project file;
Step 302: Ce district project file described in read step 301, based on Image Matching technology, pick out fast and automatically the overlapping photo of 4 degree to 6 degree;
Step 303: the reconnaissance principle relating to according to the corresponding standard of photogrammetric measurement field operation, delineation covers the alternative photo control point general location of surveying district automatically;
Step 304: the underproof alternative photo control point that manual intervention step 303 is selected automatically, determine final for stinging the alternative photo control point list of a field operation;
Step 305: the index file of setting up alternative photo control point and its 4 above overlapping all photos;
Step 306: according to the index file described in step 305, derive alternative photo control point list and corresponding image.
In described step 205, digital field thorn point device at least comprises following assembly: digital field thorn point device is comprised of panel computer, external hand held GPS receiver, data communication line three parts.
Described step 207 field thorn point program, at least comprises the steps:
Step 401: read described step 301Zhong Ce district project file;
Step 402: transfer index file in described step 305, alternative photo control point is selected in pointwise, arrives this photo control point general location on-the-spot, transfers each superimposed image;
Step 403: each photo of multiwindow linkage display in panel computer, on-the-spot each window image that amplifies is determined final position;
Step 404: click and amplify after pixel, store photo control point in database
ptpicpointed coordinate
pt(x, y);
Step 405: with textual form, some position in scene is described text message write into Databasce;
Step 406 a: operation field for position instrument decorating position is carried out to Taking Pictures recording, image information write into Databasce;
Step 407: complete described step 210;
Step 408: repeating said steps 402 is to step 407;
Step 409: complete and survey after district's all pricking method points work, a bit data library information is exported as to TXT form and JPG form.
Feature of the present invention is: l, reconnaissance system can reduce operator professional knowledge threshold, are convenient to Technique Popularizing; 2, digitized video Zoom in can improve thorn point precision, reduces rework rate; 3, utilize panel computer and handhold GPS technology to improve and look for point efficiency; 4, digital achievement preserves, transmits convenient and swift.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described:
Fig. 1 digitizing thorn dot system structural drawing;
Fig. 2 chooses sheet reconnaissance program structure diagram;
Fig. 3 field thorn point program structure diagram;
Fig. 4 digital field thorn point device example photo.
Embodiment
The object of the invention is to realize by following technical method, design a kind of aerophotogrammetric field work digitizing thorn point methods, as shown in Figure 1, at least comprise the steps:
Step 101: interior industry reconnaissance module: lay to cover and survey the alternative photo control point of district's sufficient amount, and digital aviation image and alternative photo control point rough coordinates are imported to digital field thorn point device;
Step 102: field operation reconnaissance module: by digital field thorn point device, at the selected corresponding scene of all alternative photo control point of step 101, demarcate final photo control point information on digital aviation image, and set up its ground coordinate of Instrument measuring
po(X, Y, H).
Industry reconnaissance module in described step 101, at least comprises the steps:
Step 201: data is prepared, and aviation image is sorted according to air strips;
Step 202: according to photo control point reconnaissance principle in photogrammetric measurement field operation national standard, demarcate each alternative photo control point in the sheet reconnaissance program of choosing of self-service exploitation
ptsummary region;
Step 203: demarcate each alternative photo control point in Google Earth
ptgeneral location is also derived the terrestrial coordinate under its WGS84 ellipsoid
pt(B, L, H);
Step 204: all alternative photo control point terrestrial coordinates are imported to handhold GPS;
Step 205: assembling digital field thorn point device, connects connecting line assurance panel computer and hand-held set GPS communication normal.
Step 206: take digital aviation image as base map in panel computer, use handhold GPS to navigate to summary scope (approximately 50 meters);
Step 207: sting in the field of independent development in some program and load the rear aviation image of corresponding correction as base map, the local terrestrial coordinate simultaneously receiving in real time in read step 206
ph(B, L, H), according to what show in real time on base map
ph(B, L, H), select to arrive at
pt(B, L, H)best traffic route;
Step 208: arrive at
pt(B, L, H)scene, in thorn point program, the digital aviation image of Zoom in, behind selected accurately some position, determines and records three some position information: 1. demarcating accurate some position on photo in the wild
pt(x, y); 2. description of station is described; 3. gather this site work photo;
Step 209: at accurate photo control point
ptits ground coordinate of Instrument measuring is set up at corresponding scene
po(X, Y, H);
Step 210: by photo control point
ptground coordinate
po(X, Y, H)as the information storage of the 4th of the some position described in step 208;
Step 211: in returning by wireless network as control Measurement results, industry is for aerotriangulation.
In described step 202, as shown in Figure 2, choose sheet reconnaissance program and at least comprise the steps:
Step 301: according to image information and engineering attribute, set up and survey district's project file;
Step 302: Ce district project file described in read step 301, based on Image Matching technology, pick out fast and automatically the overlapping photo of 4 degree to 6 degree;
Step 303: the reconnaissance principle relating to according to the corresponding standard of photogrammetric measurement field operation, delineation covers the alternative photo control point general location of surveying district automatically;
Step 304: the underproof alternative photo control point that manual intervention step 303 is selected automatically, determine final for stinging the alternative photo control point list of a field operation;
Step 305: the index file of setting up alternative photo control point and its 4 above overlapping all photos;
Step 306: according to the index file described in step 305, derive alternative photo control point list and corresponding image.
In described step 205, as shown in Fig. 4 example photo, digital field thorn point device at least comprises following assembly, it is characterized in that: digital field thorn point device is comprised of panel computer, external hand held GPS receiver, data communication line three parts.
Described step 207 field thorn point program, as shown in Figure 3, at least comprises the steps:
Step 401: read described step 301Zhong Ce district project file;
Step 402: transfer index file in described step 305, alternative photo control point is selected in pointwise, arrives this photo control point general location on-the-spot, transfers each superimposed image (more than 4 degree);
Step 403: each photo of multiwindow linkage display in panel computer, on-the-spot each window image that amplifies is determined final position;
Step 404: click and amplify after pixel, store photo control point in database
ptpicpointed coordinate
pt(x, y);
Step 405: with textual form, some position in scene is described text message write into Databasce;
Step 406 a: operation field for position instrument decorating position is carried out to Taking Pictures recording, image information write into Databasce;
Step 407: complete described step 210;
Step 408: repeating said steps 402 is to step 407;
Step 409: complete and survey after district's all pricking method points work, a bit data library information is exported as to TXT form and JPG form.
The present invention utilizes the sheet reconnaissance program of choosing of independent development, directly on digitized video, select alternative photo control point, by digital field thorn point device, carry out alternative photo control point position real-time navigation, at operation field, utilize the field thorn point program of independent development to carry out Zoom in to digital aviation image, accurately selected photo control point position, frame station is measured after this ground coordinate, four information such as a picpointed coordinate, the on-the-spot text description in some position, site work photo, some position ground coordinate of putting are stored and are derived with database form, and industry link in passback.This aerophotogrammetric field work digitizing thorn point methods, it can improve thorn point operating efficiency and precision, strengthens operation popularization and convenience.
The parts that the present embodiment does not describe in detail and technique belong to well-known components and the conventional means of the industry, here not narration one by one.
Claims (5)
1. aerophotogrammetric field work digitizing thorn point methods, is characterized in that: at least comprise the steps:
Step 101: interior industry reconnaissance module: lay to cover and survey the alternative photo control point of district's sufficient amount, and digital aviation image and alternative photo control point rough coordinates are imported to digital field thorn point device;
Step 102: field operation reconnaissance module: by digital field thorn point device, at the selected corresponding scene of all alternative photo control point of step 101, demarcate final photo control point information on digital aviation image, and set up its ground coordinate of Instrument measuring
po(X, Y, H).
2. aerophotogrammetric field work digitizing thorn point methods according to claim 1, is characterized in that: industry reconnaissance module in described step 101, at least comprises the steps:
Step 201: data is prepared, and aviation image is sorted according to air strips;
Step 202: according to photo control point reconnaissance principle in photogrammetric measurement field operation national standard, demarcate each alternative photo control point in the sheet reconnaissance program of choosing of self-service exploitation
ptsummary region;
Step 203: demarcate each alternative photo control point in Google Earth
ptgeneral location is also derived the terrestrial coordinate under its WGS84 ellipsoid
pt(B, L, H);
Step 204: all alternative photo control point terrestrial coordinates are imported to handhold GPS;
Step 205: assembling digital field thorn point device, connects connecting line assurance panel computer and hand-held set GPS communication normal;
Step 206: take digital aviation image as base map in panel computer, use handhold GPS to navigate to summary scope;
Step 207: sting in the field of independent development in some program and load the rear aviation image of corresponding correction as base map, the local terrestrial coordinate simultaneously receiving in real time in read step 206
ph(B, L, H), according to what show in real time on base map
ph(B, L, H), select to arrive at
pt(B, L, H)best traffic route;
Step 208: arrive at
pt(B, L, H)scene, in thorn point program, the digital aviation image of Zoom in, behind selected accurately some position, determines and records three some position information: 1. demarcating accurate some position on photo in the wild
pt(x, y); 2. description of station is described; 3. gather this site work photo;
Step 209: at accurate photo control point
ptits ground coordinate of Instrument measuring is set up at corresponding scene
po(X, Y, H);
Step 210: by photo control point
ptground coordinate
po(X, Y, H)as the information storage of the 4th of the some position described in step 208;
Step 211: in returning by wireless network as control Measurement results, industry is for aerotriangulation.
3. aerophotogrammetric field work digitizing thorn point methods according to claim 2, is characterized in that: in described step 202, choose sheet reconnaissance program and at least comprise the steps:
Step 301: according to image information and engineering attribute, set up and survey district's project file;
Step 302: Ce district project file described in read step 301, based on Image Matching technology, pick out fast and automatically the overlapping photo of 4 degree to 6 degree;
Step 303: the reconnaissance principle relating to according to the corresponding standard of photogrammetric measurement field operation, delineation covers the alternative photo control point general location of surveying district automatically;
Step 304: the underproof alternative photo control point that manual intervention step 303 is selected automatically, determine final for stinging the alternative photo control point list of a field operation;
Step 305: the index file of setting up alternative photo control point and its 4 above overlapping all photos;
Step 306: according to the index file described in step 305, derive alternative photo control point list and corresponding image.
4. point methods is stung in aerophotogrammetric field work digitizing according to claim 2, it is characterized in that: in described step 205, digital field thorn point device at least comprises following assembly: digital field thorn point device is comprised of panel computer, external hand held GPS receiver, data communication line three parts.
5. aerophotogrammetric field work digitizing thorn point methods according to claim 2, is characterized in that: described step 207 field thorn point program, at least comprises the steps:
Step 401: read described step 301Zhong Ce district project file;
Step 402: transfer index file in described step 305, alternative photo control point is selected in pointwise, arrives this photo control point general location on-the-spot, transfers each superimposed image;
Step 403: each photo of multiwindow linkage display in panel computer, on-the-spot each window image that amplifies is determined final position;
Step 404: click and amplify after pixel, store photo control point in database
ptpicpointed coordinate
pt(x, y);
Step 405: with textual form, some position in scene is described text message write into Databasce;
Step 406 a: operation field for position instrument decorating position is carried out to Taking Pictures recording, image information write into Databasce;
Step 407: complete described step 210;
Step 408: repeating said steps 402 is to step 407;
Step 409: complete and survey after district's all pricking method points work, a bit data library information is exported as to TXT form and JPG form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310582090.5A CN103759720B (en) | 2013-11-20 | 2013-11-20 | Aerophotogrammetric field work digitizing thorn point methods |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310582090.5A CN103759720B (en) | 2013-11-20 | 2013-11-20 | Aerophotogrammetric field work digitizing thorn point methods |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103759720A true CN103759720A (en) | 2014-04-30 |
| CN103759720B CN103759720B (en) | 2016-04-13 |
Family
ID=50526996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310582090.5A Active CN103759720B (en) | 2013-11-20 | 2013-11-20 | Aerophotogrammetric field work digitizing thorn point methods |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103759720B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107806862A (en) * | 2017-10-26 | 2018-03-16 | 中煤航测遥感集团有限公司 | Aerophotogrammetric field work measuring method and system |
| CN108596492A (en) * | 2018-04-25 | 2018-09-28 | 中国电建集团成都勘测设计研究院有限公司 | A kind of town and country aerial survey management information system |
| CN112304294A (en) * | 2020-10-30 | 2021-02-02 | 杭州今奥信息科技股份有限公司 | Image control point distribution control and measurement method and system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102538770A (en) * | 2012-01-17 | 2012-07-04 | 中国电力工程顾问集团中南电力设计院 | Low altitude photography image control point arranging method |
| CN103245331A (en) * | 2013-05-13 | 2013-08-14 | 重庆市勘测院 | Large-scale aerial survey indoor and outdoor integrated system and control method |
-
2013
- 2013-11-20 CN CN201310582090.5A patent/CN103759720B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102538770A (en) * | 2012-01-17 | 2012-07-04 | 中国电力工程顾问集团中南电力设计院 | Low altitude photography image control point arranging method |
| CN103245331A (en) * | 2013-05-13 | 2013-08-14 | 重庆市勘测院 | Large-scale aerial survey indoor and outdoor integrated system and control method |
Non-Patent Citations (2)
| Title |
|---|
| 张辉等: "Google Earth配合手持GPS在送电线路航测外控选刺点中的应用", 《科技传播》, no. 24, 31 December 2010 (2010-12-31) * |
| 曾庆伟等: "GPS 手持机+ Google E arth联合进行像控点选刺的探索与应用", 《铁道勘察》, no. 4, 31 August 2009 (2009-08-31) * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107806862A (en) * | 2017-10-26 | 2018-03-16 | 中煤航测遥感集团有限公司 | Aerophotogrammetric field work measuring method and system |
| CN107806862B (en) * | 2017-10-26 | 2020-09-29 | 中煤航测遥感集团有限公司 | Aerial survey field measurement method and system |
| CN108596492A (en) * | 2018-04-25 | 2018-09-28 | 中国电建集团成都勘测设计研究院有限公司 | A kind of town and country aerial survey management information system |
| CN108596492B (en) * | 2018-04-25 | 2021-09-24 | 中国电建集团成都勘测设计研究院有限公司 | Urban and rural aerial survey management information system |
| CN112304294A (en) * | 2020-10-30 | 2021-02-02 | 杭州今奥信息科技股份有限公司 | Image control point distribution control and measurement method and system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103759720B (en) | 2016-04-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Turker et al. | Automatic detection of earthquake‐damaged buildings using DEMs created from pre‐and post‐earthquake stereo aerial photographs | |
| CN1838164B (en) | Full-digitized field information acquisition, recording and processing method for land survey | |
| CN101452072B (en) | Electronic information system for earth monitor and method thereof | |
| KR102399227B1 (en) | Managing system of underground facilities using gpr detector | |
| CN104679822B (en) | A kind of geographical national conditions fieldwork measurement method | |
| US8300895B2 (en) | Virtual white lines for delimiting planned excavation sites | |
| US8290204B2 (en) | Searchable electronic records of underground facility locate marking operations | |
| Clegg et al. | Digital geological mapping with tablet PC and PDA: A comparison | |
| CN106227843A (en) | A kind of geological disaster field investigation information acquisition system and method | |
| CN109636868B (en) | High-precision image map online construction method and device based on WebGIS and deep learning | |
| CN106780165A (en) | A kind of architecture information is gathered and edited and AMS | |
| CA2715312A1 (en) | Searchable electronic records of underground facility locate marking operations | |
| CN103759720B (en) | Aerophotogrammetric field work digitizing thorn point methods | |
| DK201400507A1 (en) | Construction site image management system and method | |
| CN114283255A (en) | Underground engineering inspection panoramic image processing method matched with working condition time sequence | |
| JP4712202B2 (en) | Survey drawing drawing system such as land parcel map | |
| WO2019242081A1 (en) | Cadastral surveying system based on multi-platform laser radar | |
| JP5814497B2 (en) | Map / handwritten information input / utilization system, method and program thereof | |
| CN108088421A (en) | A kind of method and system of aerial survey of unmanned aerial vehicle control point automatic identification | |
| CN115493567A (en) | Unmanned aerial vehicle technology-based homeland surveying and mapping method, system and application | |
| CN104964670A (en) | Method for paperless photogrammetry by digital equipment | |
| CN103557849A (en) | Rapid mountainous individual tree absolute positioning and coordinate correction method applied to quickbird images | |
| KR101291924B1 (en) | Apparatus, system and method using portable serveying terminals based on augmented reality approach | |
| CN113418511B (en) | Digital mapping system and mapping method for water conservancy and hydropower engineering geology | |
| Shiba | Imagery data processing system using aerial photography for sensitive site investigations in the route selection process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 710065 Shaanxi Province, Xi'an City Road eight No. 18 survey and Design Institute of the northwest department of science and technology Applicant after: Co., Ltd of northwest survey and design research institute of electricity Jian group of China Address before: 710065 Shaanxi Province, Xi'an City Road eight No. 18 survey and Design Institute of the northwest department of science and technology Applicant before: HYDROCHINA XIBEI ENGINEERING CORPORATION |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: HYDROCHINA XIBEI ENGINEERING CORPORATION TO: CHINA ELECTRIC POWER CONSTRUCTION GROUP NORTHWEST INVESTIGATION DESIGN + RESEARCH INSTITUTE CO., LTD. |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |