3D Spatial Data Processing System

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Frequently anticipated questions:

What does this data set describe?

Title: 3D Spatial Data Processing System
Abstract:
The 3D Spatial Dataset consists of three major types of ground objects i.e. Building, Infrastructure, and Terrain. The building models are classified into Level 1, 2 and 3 to represent different level of details to the physical building. All buildings and/or podium with footprint area greater than 4 sq. meters in B1000 digital topographic map are constructed to 3D building model and classified as Level 1 building model which mean that are extruded from the footprint of a building tower and/or podium with the relevant building base and top level but do not apply photorealistic texture. Those prominent buildings with land mark importance are constructed to Level 2 and Level 3 building models with photorealistic texture applied to surface of model. The difference of Level 3 from Level 2 is the model with reference to the architecture drawings from other departments. The infrastructure model includes major roads and bridges that are 3 dimensional representation of road on 3D surfaces and bridge in wireframe model including surfaces, parapets, girders, supporting columns and towers respectively. Terrain model is represented by Triangular Network Model (TIN) derived from available breaklines and height points from various sources with attachment of an orthophoto images. The Terrain model is a Digital Elevation Model (DEM) to represent the elevation of bare ground.
  1. How might this data set be cited?
    3D Mapping Project Section, Technical Division, Survey and Mapping Office, Lands Department, the Government of the Hong Kong Special Administrative Region (HKSAR), 20210526, 3D Spatial Data Processing System: 3D-BIT00 3D-BIT00, Survey and Mapping Office, Lands Department, the Government of the HKSAR, Hong Kong Special Administrative Region.

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: 113.825
    East_Bounding_Coordinate: 114.408
    North_Bounding_Coordinate: 22.572
    South_Bounding_Coordinate: 22.138
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 18-Jul-2012
    Ending_Date: Present
    Currentness_Reference:
    publication date
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: vector digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      Indirect_Spatial_Reference: Models' Geo-Reference Identity Number
      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • 3D Building Polygonal Model (To be Confirmed)
      • 3D Infrastructure Polygonal Model (To be Confirmed)
      • 3D Terrain TIN Model (To be Confirmed)
    2. What coordinate system is used to represent geographic features?
      The map projection used is Transverse Mercator.
      Projection parameters:
      False_Easting: 836694.05
      False_Northing: 819069.80
      Latitude_of_Projection_Origin: 22.3121333
      Longitude_of_Central_Meridian: 114.1785554
      Scale_Factor_at_Central_Meridian: 1.0
      Planar coordinates are encoded using distance and bearing
      Planar coordinates are specified using distance and bearing values. Resolution of distance values: 1
      Resolution of bearing values: 0.0002778
      Bearing is specified in units of Degrees and decimal minutes
      Bearing is measured North
      Bearing is measured from the Magnetic meridian
      Planar coordinates are specified in Millimetres
      The horizontal datum used is Hong Kong 1980 Geodetic Datum.
      The ellipsoid used is International Hayford (1910).
      The semi-major axis of the ellipsoid used is 6378388.
      The flattening of the ellipsoid used is 1/297.0.
  7. How does the data set describe geographic features?
    Building Model Attribute
    The Model Attribute of Building Model is stored in a delimited text format containing the following textual information and with the file name has the same Building Model Identity Number with the file extension ".att". The Attribute also contains the corresponding files of the models. ie. ".jpg", ".max", and ".uvw". The ".max" file is the native format being used to store the geometry of the 3D building model. The ".jpg" file is the corresponding material file for the Level 2 and 3 buildings. The ".uvw" file is the mapping file coordinate for the Level 2 and 3 buildings. The given geometry in the ".uvw" file assigns the 2D plane material (the corresponding ".jpg" file) to 3D surface. (Source: SMO)
    Model_ID
    It is a system-assigned unique 18-alphanumeric-character identity number. The 1st character represents the model type, i.e. T = Terrain. The 2nd to 11th numerical character is created by concatenating the minimum Easting and minimum Northing after discarding the 800000 value of the Infrastructure Index Polygon. (Source: SMO)
    Model_Level_Code
    A 2-alphanumeric-character code to indicate the secondary class, i.e. 01 = Level 1, 2X = Level 2, 3X = Level 3, where X is a system-assigned character for system's internal use only. (Source: SMO)
    Publication_Date
    The publication date of individual 3D model in format of YYYYMMDD. e.g. 20091231 (31st December 2009) (Source: SMO)
    MAX_content
    The ".max" file in the content is the native format being used to store the geometry of the 3D building model. (Source: SMO)
    JPG_content
    The ".jpg" file in the content is the corresponding material file for the Level 2 and 3 buildings with the width-height limitation is 4096 * 4096 pixels. (Source: SMO)
    Infrastructure Model Attribute
    The Model Attribute of the Infrastructure Model is stored in delimited text format containing the following textual information and saved with the same Infrastructure Model Identity Number with file extension ".att". The Attribute also contains the corresponding files of the models. ie. ".jpg", ".max", and ".uvw". The ".max" file is the native format being used to store the geometry of the infrastructure model. The ".jpg" file is the corresponding material file for the infrastructure. The ".uvw" file is the mapping file coordinate for the infrastructure model. The given geometry in the ".uvw" file assigns the 2D plane material (the corresponding ".jpg" file) to 3D surface. (Source: SMO)
    Model_ID
    It is a system-assigned unique 18-alphanumeric-character identity number. The 1st character represents the model type, i.e. T = Terrain. The 2nd to 11th numerical character is created by concatenating the minimum Easting and minimum Northing after discarding the 800000 value of the Infrastructure Index Polygon. (Source: SMO)
    Model_Level_Code
    A 2-alphanumeric-character code to indicate the secondary class, i.e. 01 = Level 1, 2X = Level 2, 3X = Level 3, where X is a system-assigned character for system's internal use only. (Source: SMO)
    Publication_Date
    The publication date of individual 3D model in format of YYYYMMDD. e.g. 20091231 (31st December 2009) (Source: SMO)
    MAX_content
    The ".max" file in the content is the native format being used to store the geometry of the infrastructure model. (Source: SMO)
    JPG_content
    The ".jpg" file in the content is the corresponding material file for the infrastructure. (Source: SMO)
    SMO
    SMO (Source: SMO)
    Terrain Model Attribute
    The Model Attribute of Terrain Model is stored in delimited text format contains the following textual information and saved with the same Terrain Model Identity Number with the file extension ".att". The Attribute also contains the corresponding files of the models, including ".jpg", ".max", and ".uvw". The ".max" file is the native format being used to store the geometry of the 3D terrain model. Terrain model is represented by Triangular Network Model (TIN). The ".jpg" file is the digital orthophoto image overlays the terrain in the corresponding area. The ".uvw" file is the mapping file coordinate of the terrain model. The given geometry in the ".uvw" file assigns the 2D plane material (the corresponding ".jpg" file) to 3D surface. (Source: SMO)
    Model_ID
    It is a system-assigned unique 18-alphanumeric-character identity number. The 1st character represents the model type, i.e. T = Terrain. The 2nd to 11th numerical character is created by concatenating the minimum Easting and minimum Northing after discarding the 800000 value of the Infrastructure Index Polygon. (Source: SMO)
    Model_Level_Code
    A 2-alphanumeric-character code to indicate the secondary class, i.e. EY = DTM, where Y is a system-assigned character for system's internal use only. (Source: SMO)
    Publication_Date
    The publication date of individual 3D model in format of YYYYMMDD. e.g. 20091231 (31st December 2009) (Source: SMO)
    MAX_content
    The ".max" file in the content is the native format being used to store the geometry of the 3D terrain model. Terrain model is represented by Triangular Network Model (TIN). (Source: SMO)
    JPG_content
    The ".jpg" file in the content is the digital orthophoto image overlays the terrain in the corresponding area. (Source: SMO)

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    3D Mapping Project Section, Technical Division, Survey and Mapping Office, Lands Department, the Government of the Hong Kong Special Administrative Region
    Senior Land Surveyor/3DM, Land Information Centre, Lands Department
    23/F, North Point Government Offices, 333 Java Road, North Point
    Hong Kong, Hong Kong Special Administrative Region
    The People's Republic of China

    (852) 2231 3390 (voice)
    (852) 2877 8520 (FAX)
    sls3dm@landsd.gov.hk
    Hours_of_Service: 0900-1700 (Monday to Friday)
    Contact_Instructions:
    The contract document for the purchase of digital data can also be downloaded. It is a compressed file and the size is about 2MByte.

Why was the data set created?

The 3D Spatial Data is going to provide a handy and easy 3D map base for users to proceed further with their 3D model applications so as to minimize or eliminate their needs of designing and building alternative 3D dataset in their projects.

How was the data set created?

  1. From what previous works were the data drawn?
    None (source 1 of 3)
    Survey and Mapping Office, Lands Department, 2006, 1:1000 Basic Mapping System: B1000 B1000, Survey and Mapping Office, Lands Department, Hong Kong Special Administrative Region.

    Type_of_Source_Media: online
    Source_Scale_Denominator: 1000
    Source_Contribution: Spatial and attribute information
    None (source 2 of 3)
    Survey and Mapping Office, Lands Department, 2003, Digital Orthophoto DOP5000: DOP5000 DOP5000, Survey and Mapping Office, Lands Department, Hong Kong Special Administrative Region.

    Type_of_Source_Media: Digital
    Source_Scale_Denominator: 5000
    Source_Contribution: Spatial information and mapping terrain
    None (source 3 of 3)
    (BD), Building Department, and (HyD), Highways Department, Unknown, Building Plan from BD; Engineering Plan from HyD.

    Type_of_Source_Media: Any type
    Source_Contribution: Spatial and attribute information
  2. How were the data generated, processed, and modified?
    Date: 26-Jul-2012 (process 1 of 1)
    Metadata imported.
  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    Attribute items are confined by the Item Definition and pre-defined data type. In addition, Attribute is updated by custom program that imbedded to prohibit unauthorized access to the dataset and prompt a warning message if any deviation from the standard is found.
  2. How accurate are the geographic locations?
    The horizontal position accuracy of Building and Infrastructure models are different from Terrain mdoels
  3. How accurate are the heights or depths?
    The vertical position accuracy of Building and Infrastructure models are different from Terrain mdoels
  4. Where are the gaps in the data? What is missing?
    All buildings and/or podium with footprint area greater than 4 sq. meters in B1000 digital topographic map are constructed to Level 1 building model and Only prominent land mark buildings are constructed to Level 2 or 3 building model. 9 major Bridges including Tsing Ma, Kap Shu Mun, Ting Kau, Tsing Tsuen, Tsing Yi, Kwai Tsing, Lai Chi Kok, Cheung Tsing, Ap Lei Chau, and 17 major roads including North Lantau Highway, West Kowloon Corridor, West Kowloon Highway, Island Eastern Corridor, Kwun Tong bypass, Tsing Yi North Coastal Road, Tuen Mun, Tsing Wai Highway, Tolo Highway, Tate's Cairm Highway, Tsing Long Highway, San Tin Highway, Cheung Tsing Highway, Cheung Tsing Highway, Tsuen Wan Road, Yuen Long Highway, Sha Tin Road, Fanling are constructed to Infrastructure model.
  5. How consistent are the relationships among the observations, including topology?
    The digital data files in the data set were reviewed by program to insure that all models are complete and correctly organized in the files..

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints:
The Government of the HKSAR is the copyright owner of the digital data, which is available for sale to the public at prescribed charges. The Government will issue a non-exclusive and non-transferable licence to the customer after he/she has purchased the data. The licensee is permitted to use the data from the date as set out in the Licence. The licensee must have obtained written consent from the Government and paid the necessary royalty charges before he/she can incorporate the digital data in any product for distribution to any third party. If the licensee ceases using the digital data, the licensee should confirm to the Government in writting that the data has been erased from his/her computer system. Sample data for testing computer system is availabe free of charge. Sample data for academics for teaching purpose are available on request at a nominal administrative fee. The digital data would be provided to other government departments or their consultants free of charge.
Use_Constraints:
The use of the data supplied under the licence shall be subject to the computer configuration, for the purposes and at the location as specified in the Licence Agreement. The digital data can be provided to other goverment departments and their consultants for internal use and project purpose respectively. Such data shall not be distributed in part or in whole and in whatever forms and media to a third party. The use of digital data is also subject to some conditions which can be obtained upon request.
  1. Who distributes the data set? (Distributor 1 of 1)
    Headquarters Division, Survey and Mapping Office, Lands Department, the Government of the Hong Kong Special Administrative Region
    Senior Cartographer/Headquarters, Lands Department
    23/F, North Point Government Offices, 333 Java Road, North Point
    Hong Kong, Hong Kong Special Administrative Region
    The People's Republic of China

    (852) 2231 3187 (voice)
    (852) 2116 0774 (FAX)
    smosale1@landsd.gov.hk
  2. What's the catalog number I need to order this data set?
  3. What legal disclaimers am I supposed to read?
    As stated in the General Terms and Conditions of Contract for the Supply of Government Digital Map Data
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 26-May-2021
Metadata author:
3D Mapping Project Section, Technical Division, Survey and Mapping Office, Lands Department, the Government of the Hong Kong Special Administrative Region
Senior Land Surveyor/3DM, Land Information Centre, Lands Department
23/F, North Point Government Offices, 333 Java Road, North Point
Hong Kong, Hong Kong Special Administrative Region
The People's Republic of China

(852) 2231 3390 (voice)
(852) 2877 8520 (FAX)
sls3dm@landsd.gov.hk
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (Version 2.0) (FGDC-STD-001-1998)
Metadata extensions used:
Generated by mp version 2.9.50 on Wed May 26 01:59:06 2021