LY/T 3126-2019Framework for forestry spatial database construction (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard was proposed by the Information Center of the State Forestry and Grassland Administration.

This standard is under the jurisdiction of the National Forestry Information and Data Standardization Technical Committee (SAC/TC 386).

1 Scope

This standard mainly regulates the construction content and requirements of forestry spatial databases, workflow, data source preparation, data processing, data storage, Framework requirements for data updates, quality control, construction results, and data security.

This standard applies to the construction of forestry spatial databases.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this document.

For undated references, the latest version (including all amendments) applies to this document.

GB/T 13989 National Basic Scale Topographic Map Fraction and Numbering GB/T 13923 Classification and codes of basic geographic information elements GB/T 14911 Basic Terms for Surveying and Mapping GB/T 16820 Cartographic Terminology LY/T 1954-2011 Forest Resource Survey Satellite Remote Sensing Image Map Production Technical Specification LY/T 2169 General Specification for Forestry Database Design LY/T 2174 Technical Specification for Forestry Database Update LY/T 2179 Wild animal and plant information classification and code LY/T 2180 Forest Fire Information Classification and Code LY/T 2181 Wetland information classification and code LY/T 2182 Desertification information classification and code LY/T 2184 Forest resource database classification and naming convention LY/T 2265-2014 forestry information terminology LY/T 2266 Forestry Information Metadata

3 Terms and definitions

The terms and definitions established in GB/T 14911, GB/T 16820, LY/T 2265-2014, and the following terms and definitions apply to this standard.

Forestry spatial database A collection of forestry spatial data organized according to a conceptual structure, which describes the characteristics of forestry spatial data and the relationships between entities corresponding to the data System and supports one or more application areas.

Note. Rewrite LY/T 2265-2014, definition 3.3.21.

Vector data

Generic term for graphical data such as spatial points, lines, and areas represented by coordinates or ordered coordinate strings, and related attribute data associated with them.

[GB/T 16820]

Raster data

Divides geospatial into cells arranged in rows and columns, each with a different "value" dataset.

[GB/T 16820]

Metadata

Descriptive data about the content, quality, condition, and other characteristics of the data.

[GB/T 14911]

4 Construction content and requirements

5 Work flow

The construction of forestry spatial database is mainly divided into the following four stages.

a) Data source preparation. It mainly prepares the vector data source and raster data source required for building the database;

b) Data processing. mainly includes preprocessing, inspection, modification and review of vector data and raster data;

c) Data storage. mainly refers to the storage of vector data and raster data;

d) Data update. Replace, add or delete data in the original database.

See Figure 1 for the workflow of forestry spatial database construction.

Vector data check raster data check Vector data storage raster data storage Data source Preparation stage data processing stage Data warehousing stage Data check Data preprocessing Data modification Data review Whether to meet the requirements Data warehousing Vector data source raster data source replace Data Update stage Data Update Add delete

Figure 1 Forestry spatial database construction workflow

6 Data source preparation

7 Data processing

8 Data storage

Set the database parameters according to the requirements of 4.3, and store the processed and qualified vector data and raster data into the database. Vector number Data can be stored in layers, and raster data can be stored in sections or regions. After the data is stored in the database, a metabase is generated in accordance with the provisions of LY/T 2266.

9 Data update

Data update is performed in accordance with the procedures and requirements for spatial data update in LY/T 2174. After the update, the original data is used as the historical data Management.

10 Quality control

The quality control of forestry spatial database construction should be carried out from the following three aspects.

a) Check the quality of the data source according to Appendix A, check the data format, geodetic datum, Whether the shadow method, elevation datum, layout organization, etc. meet the requirements. Check whether the attributes of the vector data source are complete and correct.

Check correspondences according to drawings;

b) Before the data is stored in the database, perform quality inspection according to 7.2, and process the data according to 7.3;

c) After the data is stored, check the results of the storage to check whether the data content is complete, the logic is consistent, and whether it meets the requirements of this standard.

begging.

11 Construction achievements

12 Data Security

Forestry spatial database security control shall be implemented in accordance with the requirements of database security in LY/T 2169.

Appendix A

(Normative appendix) Data source requirements A.1 Vector data source requirements A.1.1 Graphical data requirements the graphic data of a vector data source should meet the following requirements.

a) Data format. Shapefile format;

b) Geodetic datum..2000 national geodetic coordinate system, 1980 Xi'an coordinate system or 1954 Beijing coordinate system;

c) Projection method. 1. 1 000 000 scale adopts positive-axis equiangular-cone projection, and other scales adopt Gauss-Kruger projection.

Among them, a scale of 1.25 000 to 1. 500 000 uses a 6 band, and a scale of 1. 500 to 1.10 000 uses a 3 band.

d) Elevation benchmark. 1956 Yellow Sea elevation system or 1985 national elevation standard;

e) Map organization. Standard data division and numbering are implemented in accordance with GB/T 13989, and organized by administrative district or forestry administrative district group the organized data are divided according to the splicing standard of the administrative area or forestry administrative area.

A.1.2 Attribute data requirements the vector data source's attribute data should meet the following requirements.

a) the attributes describing the characteristics of each element shall be complete and shall not be omitted;

b) In the attribute table of point, line and area features, the attribute structure and attribute value should be correct;

c) the attribute data and the graphic data should match exactly;

d) The basic geographic attribute data should meet the requirements of GB/T 13923;

e) The vector data of forestry business shall comply with the relevant standards of forestry business, including the forest resource attribute data shall comply with LY/T 2184 Stipulated that wetland resource attribute data should comply with LY/T 2181, and desertification and desertification attribute data should comply with LY/T 2182.

Stipulated that wild animal and plant attribute data should comply with LY/T 2179 and forest fire attribute data should comply with LY/T 2180 Regulations, etc.

A.2 Raster data source requirements A.2.1 Requirements for remote sensing image data the remote sensing image data source should meet the following basic requirements.

a) Data format. TIFF or GeoTIFF format;

b) Geodetic datum..2000 national geodetic coordinate system, 1980 Xi'an coordinate system or 1954 Beijing coordinate system;

c) Projection method. 1. 1 000 000 scale adopts positive-axis equiangular-cone projection, and other scales adopt Gauss-Kruger projection.

Among them, a scale of 1.25 000 to 1. 500 000 uses a 6 band, and a scale of 1. 500 to 1.10 000 uses a 3 band.

d) Elevation datum. the 1956 Yellow Sea elevation or the 1985 national elevation datum;

e) Cloud cover area is less than 5%;

f) there should be no less than 4% overlap between adjacent images;

g) clear images, rich layers, uniform tones and moderate contrast;

h) The side view of data reception should generally be less than 15 °, not more than 25 ° in plains and not more than 20 ° in mountainous areas;

i) The data is free from banding, speckle noise, and line loss.

A.2.2 Digital elevation model, digital raster map, and digital orthophoto data requirements Digital elevation models, digital raster maps, and digital orthophoto data sources should meet the following basic requirements.

a) Data format. TIFF or GeoTIFF format;

b) Geodetic datum..2000 national geodetic coordinate system, 1980 Xi'an coordinate system or 1954 Beijing coordinate system;

c) Projection method. 1. 1 000 000 scale adopts positive-axis equiangular-cone projection, and other scales adopt Gauss-Kruger projection.

Among them, a scale of 1.25 000 to 1. 500 000 uses a 6 band, and a scale of 1. 500 to 1.10 000 uses a 3 band.

d) Elevation datum. the 1956 Yellow Sea elevation or the 1985 national elevation datum;

Graphic organization. framing and numbering are implemented in accordance with GB/T 13989.

Appendix B

(Normative appendix) Data check content B.1 Vector data check B.1.1 Graphic inspection Vector data graphics checks include.

a) Data integrity check. check whether the data contains the layers required for database construction;

b) Logical consistency check. check whether the hierarchical structure of spatial data elements meets the standards and whether the logical relationship between the data layers is positive Indeed

c) Spatial positioning accuracy check. check whether the coordinate system of the spatial data of different scales meets the requirements, the selection of the projection method and the parameters Whether the settings are correct;

d) Spatial topological relationship check. check whether topology is established, whether there are islands and holes, whether polygons are closed, whether they overlap, whether Whether the topological relationship between layers is correct, etc .;

e) Edge accuracy check. Check whether the distance between the endpoints of the features at the edges of adjacent frames is 0.

B.1.2 Property check Vector data attribute checks include.

a) Attribute data accuracy check. check the layer name canonicality, attribute data structure consistency, code consistency, value range character Validity, unique number and required fields;

b) Checking the association of graphs. check whether the graph data corresponds to the attribute data, and whether there are cases where individual sub-classes or blocks have no attributes Whether there are redundant attribute records.

B.2 Raster data inspection the raster data check includes whether the coordinates of the raster data are accurate, whether the hue meets the requirements, whether there are black and white edges, and the data format does it reach the requirement.