China Water Conservancy and Hydropower Investigation and Design Association （CWHIDA） is a non-profit and national-wide self-regulatory organization under the administration of the Ministry of Water Resources of the People's Republic of China. CWHID has members including Class A and major B companies and institutes in the China water conservancy and hydropower investigation and design industry. In order to satisfy the increasing market demand from international water conservancy and hydropower en

Introduction to English Version
Foreword
1 General Provisions
2 Terms and Symbols
2．1 Terms
2．2 Symbols
3 Basic Requirements
4 Horizontal Control Survey
4．1 General Requirements
4．2 GNSS Survey
4．3 Triangular Network Survey
4．4 Traverse Survey
4．5 Relevant Data Compilation and Submission
5 Vertical Control Survey
5．1 General Provisions
5．2 Site Selection and Monumentation
5．3 Leveling
5．4 Trigonometric Leveling with EDM
5．5 GNSS Vertical Survey
5．6 Relevant Data Compilation and Submission
6 Digital Topographic Map Surveying
6．1 General Provisions
6．2 Digital Mapping
6．3 Digital Topographic Map
6．4 Topographic Map Revision
6．5 Topographic Map of Check
6．6 Document and Data Compilation
7 Aerial and Space Photogrammetry
7．1 GeneralRequirements
7．2 Photo Control Point Design
7．3 Measurement of Photo Control Points
7．4 Annotation
7．5 Aerial Image Scanning
7．6 Digital Aerotriangulation
7．7 DLG Data Collection and Production of Map
7．8 Data Collection and Processing of Digital Elevation Model
7．9 Production of Digital Orthophoto Map
7．10 Airborne LiDAR Scanning Survey
7．11 Unmanned Air Vehicle （UAV） Low-altitude Digital Photogrammetry
7．12 Relevant Data Compilation and Submission
8 Terrestrial Laser Scanning and Terrestrial Photogrammetry
8．1 General Requirements
8．2 Terrestrial Laser Scanning Survey
8．3 Terrestrial Stereo （Multi-baseline） Photogrammetry
8．4 Relevant Data Compilation and Submission
9 Remote Sensing Image Interpretation
9．1 GeneraIRequirements
9．2 Preparation
9．3 Remote Sensing Image Processing
9．4 Establishment of Interpretation Signs
9．5 Remote Sensing Image Interpretation
9．6 Field Verification
9．7 Post Processing of Interpreted Information
10 Map Compilation
11 Special Engineering Survey
12 GIS Development
13 Editing and Warehousing of Spatial Data
14 Acceptance of Achievements and Quality Inspection and Evaluation
Annex A Horizontal Control Survey
Annex B Vertical Control Survey
Annex C Aerial Photogrammetry
Annex D Remote Sensing Image Interpretation
Annex E Special Engineering Survey
Annex F GIS Development
Annex G Product Acceptance and Quality Inspection and Evaluation