In
Zhejiang province in the southern part of the Yangtze River Delta on
the southeast coast of China, the Surveying and Mapping Bureau of
Zhejiang contributed to the completion of digital line graphs
covering the entire 101,800-square-kilometer province. All together,
17 maps in scales of 1:250000, 330 maps in scales of 1:50000, 4,107
maps in scales of 1:10000, and 226 maps in scales of 1:5000 are now
accessible to government departments involved in land development,
water conservation, transportation, telecommunications, and other
areas.
Surveying and Mapping Bureau of Zhejiang Taking Advantage Of Be
In
the past, a 250-member project team in the provincial bureau worked
on drawing, compiling, and quality inspecting the digital line graphs
over a period of nearly five years. Using Bentley solutions enhanced
work efficiency, shortening the digital line graph production process
by 50 percent and reducing man-hours by almost two-thirds. Instead of
requiring about 200 drawing personnel and 30 quality inspectors to
produce the whole province's 1:10000 digital line graphs, the project
now requires just 80 drafters and 20 inspectors to finish them.
“The
strong functionality and high efficiency of Bentley software and its
use for a variety of mapping and drawing applications significantly
increases the productivity of digital map products and can better
address the needs of GIS data by all aspects,” said Chen Shaoqin,
IT director at Zhejiang Basic Geographic Information Center.
Setting
the technological standard for cadastral surveying is one of the
major responsibilities of the Zhejiang Bureau of Surveying and
Mapping. All digital line graph product drawings must follow China’s
basic national scale topographic map regulations. The digital line
graphs not only have to compile graphical information, but also
collect enough attribute information to meet the potential future
needs of GIS applications, keeping factor classification codes in
line with national standards.
To
comply with national regulations and practical situations, the
Zhejiang Bureau of Surveying and Mapping customized the document
workspace in MicroStation, including suitable seed documents,
resource files, font libraries, color tables, and data dictionaries.
Graphics were linked with their attributes using the MDL development
tool for tag management. The majority of the graphic properties and
attributes were stored in the same document to guarantee easy
management and maintenance of files. Attributes of the factor
classification codes were managed and maintained through the
MicroStation GeoGraphics MSLink keyword function.
Improving
topological data quality was also an important goal of the project to
ensure that the digital line graphs would satisfy GIS data
requirements and be smoothly imported into databases. Bentley
software enhanced the digital line graph product quality by providing
a stable data format, superior drawing performance, convenient and
reliable tag management, and strong topology functions.
Using
the functions provided by MicroStation GeoGraphics and a secondary
development interface, the project team performed numerous
topological analyses to make certain the topological data would be
reliable. Adopting the MDL development language and quality
inspection tools enabled high quality of the graphics and attributes.
Achieving
efficient resource sharing among the various government departments
meant converting data back and forth between DGN and other GIS data
formats. The team used the ArcObjects interface for lossless data
conversion from MicroStation to geodatabase and FME to convert the
spatial data into other GIS formats.
Zhejiang
province is one of the provinces enjoying the fastest economic growth
in China and its application to GIS technology is leading the GIS
industry in China. Through the ability to share digital line graphs
in different scales and database with other departments, the Zhejiang
Bureau of Surveying and Mapping has significantly contributed to the
development of 20-plus departments of government in Zhejiang
province, such as irrigation works, traffic, telecommunication, and
environmental protection.
In
Zhejiang province in the southern part of the Yangtze River Delta on
the southeast coast of China, the Surveying and Mapping Bureau of
Zhejiang contributed to the completion of digital line graphs
covering the entire 101,800-square-kilometer province. All together,
17 maps in scales of 1:250000, 330 maps in scales of 1:50000, 4,107
maps in scales of 1:10000, and 226 maps in scales of 1:5000 are now
accessible to government departments involved in land development,
water conservation, transportation, telecommunications, and other
areas.
