Digital products of fundamental geographic information 1: 10000， 1: 50000 digital raster praphics
Some standard content:
CH/T 1010--- 2001
This standard is prepared in accordance with GB/T1.3--1997
Part: Provisions for the Preparation of Product Standards: Foreword
Unit 1: Rules for the Drafting and Expression of Standards "Guidelines for Standardization Work
This standard is to meet the needs of digital surveying and mapping production and basic geographic information update and database construction for the production, quality control and distribution of 1:10000, 1:5000) digital raster map products, with reference to the "1 ：50（000 Digital Ning Raster Map (DRG) Production Technical Regulations", formulated according to the current production technology level. This standard is the first time to be issued in China.
This standard is proposed and managed by the State Administration of Surveying, Mapping and Geoinformation. The drafting unit of this standard: Surveying and Mapping Standardization Institute of the State Administration of Surveying, Mapping and Geoinformation. The main drafter of this standard: Ma Xiaoping.
Surveying and Mapping Industry Standard of the People's Republic of China
Basic Geographic Information Digital Products
1:10000,1:50000 Digital Raster Graphics1 : 10 000,1 : 50 000 digital raster graphicsCH/T 1010.-2001
This standard specifies the classification, product labeling, technical indicators and technical requirements of 1:10000 and 1:50000 digital grid map products.
This standard is applicable to the production, quality assessment and product distribution of 1:10000 and 1:50000 digital grid map products in digital mapping production and basic geographic information update and database construction. Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T13989--1992 National Basic Scale Topographic Map Division and Numbering GB/T17798--1999 Geospatial Data Exchange Format GB/T18315--2001
Digital Topographic Map Series and Basic Requirements
GB/T18316.--2001
Digital Surveying and Mapping Product Inspection and Acceptance Rules 3 Product Description
Digital Raster (Graphic, referred to as DRG) is a map graphic data set stored in raster data format, and is an important part of my country's basic geographic information digital products. Digital raster maps are basically consistent with topographic maps in terms of content, geometric accuracy, specifications, color, etc. This product can be formed by analog maps after scanning, geometric correction and color naturalization, or it can be converted from map graphic data in vector data format: it is an important part of my country's basic geographic information digital products-4 Product classification
4.1 Classification
Digital raster maps are divided into two categories according to color. The classification codes are shown in Table 1 Table 1 Digital raster map classification
Digital raster map color
4.2 Marking example
National Surveying and Mapping Approved on March 5, 2001
Implementation on April 1, 2001
CH/T 1010---2001
Product marking is used on product packaging and product labels. Product marking should include product name, product classification code, tile number and standard number of the adopted standard. The examples are as follows: a) 1:10000 monochrome digital grid map
digital grid map DH50G092005
b) 1:50000 color digital grid map
digital grid map
XXXXXXXXX
-Standard number of the adopted standard
tile number
product classification code
-Product name
XXXXXXXXX
J50E024005
-Standard number of the adopted standard
Map sheet number
Product classification code
Product name
c) Multiple digital raster maps are stored in one medium (such as a CD), which can be used to describe the digital raster maps
5 Technical indicators
5.1 Basic content
J50E024005J50E024006 J50E024007 Sheet number
Product classification code
-Product name
XX×XXXXX×--×XX×
-Standard number of the adopted standard
All contents and metadata on 1:10000, 1:50000 national basic scale topographic maps 5.2 Spatial positioning reference system
Digital grid map, the plane coordinate system and elevation benchmark of the product shall be implemented in accordance with GB/T18315-2001. 5.3 Resolution
The resolution is 300dpi, that is, the ground resolution is approximately: 1:10000 is 0.8m, 1:50000 is 4m. 5.4 Accuracy
5.4.1 Plane position accuracy
The deviation of the coordinate value of the map point shall not exceed. pixels. The difference between the map outline size and the theoretical size shall not exceed the provisions of Table 2. Table 2
Scale
1:10000
1:50000
The mean error of the position of the feature point on the map to the nearest field control point shall not be greater than that specified in Table 3. 394
Unit: m (pixel)bzxz.net
Scale
110000
1:50 000
5.4.2 Elevation accuracy
CH/T 1010
Flat land, hills
The mean error of the elevation of the elevation point and contour line to the nearest field control point shall not be greater than that specified in Table 4Table 4
1: 1(0 000
1:50000
elevation point
contour line
common point
contour line
tt||twice the error in each point is the maximum error limit. 5.5 Graphics and color quality
If it is a color map, the color must be unified
the shape should be clear, without blurring or virtual interruption. i mountain
unit: mm (pixel)
mountain, high mountain
unit: m
high mountain
. color The value should be correct. The RGB color mode is shown in Table 5 Table 5
RGB color mode
Light blue
Light green
5.6 Data format
The data format shall be implemented in accordance with (B/T17798-1999. 6 Technical requirements
Map range and sub-map number
Indicates narrow
Landform and quality, grade highway general color
Linear elements and symbols in water system
Water system area color
Vegetation Symbols
Woodland General Dye
Other Elements
Revision Content and Explanation Notes
1:10000 digital grid map product range is 3°45\ longitude difference, 2°30\ latitude difference, 1:50000 digital grid map product range is 15'00\ longitude difference, 10°00\ latitude difference. Numbering is in accordance with GB/T139891992. 6.2 Data Source
a) The map outline size and spatial positioning reference system of the topographic map data used for scanning shall meet the requirements Requirements: Use the latest published maps with strong timeliness. Try to use topographic maps with flat surface, no creases, no yellow spots, neat graphics and annotations, clear lines and colors as scanning base maps: Digital topographic maps used for rasterization must have complete elements and strong timeliness. b) Data or related information (such as digital images, etc.) used to supplement and update IDR (data products) should be highly current. The mapping or data collection period should not exceed two years.
6.3 Scanning resolution
CH/T 1010---2001
The scanning resolution parameter should not be less than 400dpi, preferably 400~600dpi. 6.4 Data processing
For the scanned data, geographic positioning must be performed, and the whole map should be geometrically corrected by bilinear transformation or polynomial transformation according to the inner map outline and grid. De-noising, graphic editing, color naturalization, etc. should also be performed. 6.5 Metadata
Digital raster map products shall contain metadata. The metadata content and filling rules shall be implemented in accordance with CH/T10072001. 7 Product packaging
Digital raster map products are composed of data sets, metadata, etc., with CDs as the main storage media, and tapes, disks, etc. can be used. The outer packaging shall include trademarks, product marks, production units, production time, edition/year, price, etc. 8 Product testing methods
The testing methods of digital raster map products shall be implemented in accordance with GB/T183162001
9 Product inspection rules (quality assessment procedures) The inspection rules of digital raster map products shall be implemented in accordance with GB/T18316--2001: 10
Product distribution format
The distribution format of digital raster map products shall be implemented in accordance with G13/T17798-1999. 11 Confidentiality
The production, distribution and use of digital raster map products shall be implemented in accordance with the "State Security Law of the People's Republic of China" and relevant regulations. 396
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