Use higher resolution remote sensing images
The plan will start on 20 17 and be completed on 20 19 12 3 1.
Carry out the third national land survey to comprehensively find out the utilization and ownership of every piece of land in urban and rural areas throughout the country.
Obtain thematic data of land and resources management, analyze natural ecological conditions and construction land, and investigate and evaluate cultivated land quality.
Second, the main task
1. Land use survey (including urban land use survey)
2. Investigation of real estate ownership
3. Basic farmland survey
4. Special investigation
5. Construction of land survey database
Among them, the state deployed local governments to carry out real estate ownership investigation, and the other four tasks were organized by the state to carry out local governments, build a four-level database and summarize it nationwide.
1. Land use survey (outside cities and towns)
Resolution: Use satellite images better than 1m and 2m.
Scale: the scale shall not be less than 1:5000.
(The scale of forest or pastoral area is 1: 10000, and the scale of desert no man's land is 1: 50000).
Classification standard of investigation: classification according to the present situation of land use (second adjustment standard).
On-the-spot investigation of the utilization type, scope, area and distribution of each piece of land outside the town.
At the same time, a detailed survey of cultivated land was carried out, and the position, scope, area and distribution of cultivated land in flood storage and detention areas, inland beach farmland and forest farmland were found out.
(Investigation on the Present Situation of Urban Land Use)
Resolution: use aerial images better than 0.2m,
Scale: 1:2000 is the main scale.
Combined with the results of urban cadastral survey, the urban land use situation was investigated, and the utilization and distribution of urban commercial service land, residential land, industrial and mining storage land, academic park and other land in China were found out.
2. Real estate property right survey (deployed locally)
Using the registration results of collective land ownership, land acquisition and other data, find out the information of the subject, boundary and area of collective land ownership, and establish a database for collective land ownership investigation;
According to the relevant technical specifications of real estate ownership investigation, make full use of the existing real estate ownership achievements, and organize the real estate ownership investigation of land, woodland, grassland, sea area and other units, so as to provide the basis and basis for real estate registration.
3. Basic farmland survey
According to the overall land use planning, basic farmland delineation, permanent basic farmland delineation, high-standard basic farmland construction and other data, the scope of basic farmland, permanent basic farmland and high-standard basic farmland will be defined on the map of land use status.
Find out the type, distribution and area of land use within the scope of basic farmland, permanent basic farmland and high-standard basic farmland, and establish special data for basic farmland.
4. Special investigation
(1) The investigation of unused land has been approved.
According to the approval data of construction land filed by the comprehensive information supervision platform of land and resources and the documents of construction land approved in previous years, and compared with the high-resolution orthophoto data, the scope and boundary of approved unused land are implemented on the current map of land use, and the land use type, distribution and area within the approved unused land range are found out, and the special survey data of approved unused land are established.
(2) Urban development boundary investigation
According to the relevant data of urban development boundary, the delineation of urban development boundary is carried out on the current map of land use, the land use type, distribution and area within the urban development boundary are found out, and the special investigation data of urban development boundary are established.
(3) boundary investigation of development zone
According to the national and provincial development zone approval boundaries and other data, the development zone boundaries will be implemented on the map of land use status, find out the land use type, distribution and area in the development zone, and establish special survey data of the development zone.
(4) Investigation and evaluation of cultivated land quality.
On the basis of the results of the third national land survey, all the existing cultivated land quality grades were comprehensively investigated and evaluated, and the database of cultivated land quality grades at county, provincial and national levels was established.
5. Construction of land survey database
According to the land survey results, the 2000 national geodetic coordinate system and the secondary survey database are adopted to rebuild the land survey databases at the county, city, province and country levels, unify data standards and ensure data consistency.
Third, the technical route and methods (new features)
1, preliminary judgment of land type consistency
The third land survey should be fully based on the results of the second land survey and the annual change survey.
The state organizes professional teams to judge the consistency of key land types such as cultivated land according to the orthophoto data and land change survey data of the previous year.
Distinguish the consistent and inconsistent parts of the extracted image from the database. On this basis, carry out field investigation and demonstration work.
2. extract Kugaji from the town.
Based on the high-resolution orthophoto image data (aerial photograph) and the data of land change survey in the previous year, the parts without construction traces or unused in towns are extracted through image comparison. Check, confirm, investigate and provide evidence for the school parks extracted from the town.
3, the use of new technology to carry out the investigation work.
Use the global satellite positioning technology, remote sensing technology, geographic information system and other 3S integrated technologies and mobile Internet technology to carry out field investigation and verification and data database construction.
For the change of points and key land types that are inconsistent with the initial judgment result of national land type consistency, all localities should use field mobile terminal equipment to generate encrypted evidence data packets including comprehensive information such as field GPS coordinates, field photos, videos, shooting directions, shooting time, etc., and submit them to the provincial level for review, and the provincial level will adopt Internet technology instead of field review.
Quality inspection of survey results:
Make full use of 3S integration and the new generation of mobile Internet technology, and adopt a combination of provincial review and national confirmation. Based on the encrypted evidence data packets including GPS coordinates, photos, videos, shooting directions, shooting time and other comprehensive information collected by local mobile terminal equipment in the field, combined with the latest remote sensing images, the quality of investigation results submitted by local authorities is audited, which improves work efficiency and shortens the verification period.
Fully confirm the suspicious and key geographical points in the indoor industry, organize professional and technical personnel to carry out on-the-spot verification by using mobile terminal equipment in the outdoor industry, and the state uses wireless VPDN encrypted private network to conduct real-time online dynamic supervision on the whole process of on-the-spot verification to ensure the authenticity and reliability of the verification results. According to the results of national audit and confirmation, carry out docking and rectification work with the provincial level to form the final investigation results.
Fourth, theme analysis.
① land use analysis
According to the results of land survey and other relevant information, the land use and ownership status are analyzed. Focus on the comprehensive analysis of the quantity, distribution, utilization structure and historical changes of cultivated land, basic farmland and various types of construction land; Analyze the land use situation, urban and rural land use structure and layout of different regional types within the jurisdiction; Evaluate the degree of intensive land use, predict the changing trend, and put forward suggestions on tapping potential intensive land use.
② Analysis of ecological conditions
Using the results of the third national land survey and digital elevation model, the implementation of ecological construction projects within the scope of major national ecological construction areas, the natural ecological conditions such as water flow, forests, mountains, grasslands, wasteland and beaches in national nature reserves, key ecological function areas, eco-environment sensitive areas and fragile areas were investigated, and the data of land use type, distribution, area and slope were statistically summarized. On this basis, collect and sort out other materials related to the natural ecological environment and land use protection, and make a comprehensive analysis of the natural ecological situation in this area in combination with relevant policy documents, and put forward suggestions and countermeasures.