GB/T 34514-2017Requirements for remote sensing data distribution and user services for land observation satellites (English PDF)

5.3 Distribution

5.3.1 Optical Remote Sensing Data Products The distribution of optical remote sensing data products should generally include the following.

--- Optical image data;

--- Metadata files, including auxiliary data such as radiation calibration coefficients, satellite attitude orbit information, and image geographic location;

--- thumbnail (quick view);

--- RPC parameter file (optional for L1 products).

5.3.2 Microwave Remote Sensing Data Products The distribution of microwave remote sensing data products should generally include the following.

--- Microwave data;

--- Metadata files, including auxiliary calibration data such as radiation calibration coefficients, satellite attitude orbit information, polarization mode, and geographic location

--- Thumbnails (quick view).

5.3.3 Other remote sensing data products The distribution content of other remote sensing data products such as geophysics should generally include remote sensing data and metadata files.

5.4 Distribution format Image-type remote sensing data products are usually distributed in scenes, frames or designated areas.

a) Image data is in standard GeoTIFF format, JPEG2000 format or BigTIFF format;

b) the metadata file is in XML format;

c) The thumbnails are in JPEG format. Non-image-type remote sensing data products are distributed as uncompressed raw files. Advanced products and user-defined products can be customized according to user requirements. Format for distribution.

5.6 Distribution method

5.6.1 Online distribution The online distribution mainly includes the following.

a) dedicated line push;

b) Network distribution.

5.6.2 Offline Distribution Offline distribution mainly refers to mobile storage media distribution.

6.1 Archive data service processes and requirements

6.1.1 Archive data service process The network service process for archiving data is shown in Figure 1. Ordering and data download. The provider distributes the archived remote sensing data products online or offline according to the order submitted by the user. with Providers need to manage user, order, and data product metadata. Figure

6.2 Programming data service process and requirements

6.2.1 Programming Data Service Process The service flow of programming data is shown in Figure 2. The user submits a satellite programming application, and the provider performs satellite orbits according to the user's application Calculate and feed back the results of satellite transit calculations to users, and both parties will jointly confirm the satellite programming tasks. Providers implement satellite data collection, Data processing, data distribution, and data cataloging, archiving and distribution. Figure

6.3 Emergency data service process and requirements

6.3.1 Emergency data service process The emergency data service process is as follows:

a) Obtain emergency data demand information and start the emergency response mechanism;

b) Dispatching satellites in orbit for emergency mission planning, emergency command generation and betting, and feedback of planning results to users;

c) provide users with emergency archived data products;

d) emergency processing data, generating emergency data products and providing them to users;

e) Terminate emergency data services according to the degree of emergency development or instructions from superiors.

6.3.2 Emergency data service requirements Emergency data services should ensure timeliness, including satellite dispatch, data acquisition, data processing, data provision and other links. Received should After urgent needs, services should meet the following requirements.

a) Provide users with archived data required for emergency within 2h;

b) satellite emergency observation instructions developed within 30 minutes;

c) Provide users with services in a timely, adequate and sustainable manner.

6.4 Other requirements for data services

6.4.1 Data Product Release Cycle L1 and L2 data products are usually published on the data distribution service website on the day of data acquisition, and the release delay should not exceed 3 hours. Working day.

6.4.2 Data Product Supply Cycle For archived data, generally should be provided within 48h. For satellite programming services, after the satellite acquires data and receives and processes it on the ground, it can provide it according to the archived data.

6.4.3 Data Product Temporary Storage Period For data ordered online by users through the data distribution service website, a temporary storage period of data of not less than 7 natural days is provided.

6.4.4 Technical Document Download Service Provides technical file download services related to satellite and data products, which generally include.

a) Basic introduction of satellites and sensors;

b) product manuals;

c) absolute radiation calibration coefficient;

d) sensor spectral response function;

e) the irradiance of the solar spectrum at the top of the sensor's atmosphere;

f) Other relevant technical documents. Satellite-related technical documentation should be provided within 30 working days after the satellite is delivered for use, and absolute radiation calibration coefficients are provided at least annually once.

6.4.5 Technical consulting services Provide consulting services based on telephone, Internet and other methods. Service information such as hotline and email address are published on the website. User inquiry Questions are answered within two working days.

6.5 User Registration Service

6.5.1 Support the registration of domestic citizens and legal entities.

6.5.2 The main information of individual user registration includes. name, gender, ID type and number, contact information, region and industry.

6.5.3 Institutional user registration main information includes. institution name, institution legal person, institution organization code, region and industry.

6.5.4 The data provider shall keep the user information strictly confidential.

6.6 Security and confidentiality requirements For security and confidentiality requirements, refer to relevant national administrative measures.