National Vertical Network (NVN) is a network of geodetic benchmarks established based on National Geodetic Survey (NGS) Standards,
General Authority for Survey and Geospatial Information (GASGI) established the network to achieve the following objectives:
- Compute the GEOID model for the kingdom.
- Production of High accuracy topographic maps.
- Build Digital Terrain Model (DTM) for the Kingdom.
- Executing of projects such as roads and pipelines with high accuracy.
- Leveling of agriculture area and construction of irrigation channels.
- Contribute in establishing Urban planning works and the relevant services network.
- Study crustal deformation.
The National Vertical Network (NVN) was utilized as a realization of Kingdom of Saudi Arabia Vertical Reference System - the Kingdom of Saudi Arabia Vertical Reference Frame Jeddah 2014 (KSA-VRF14). National Vertical Network (NVN) consist:
- Observations: precise geodetic levelling
- Benchmarks: 3893
- Leveling lines: 88
- Average distance between benchmarks: 6 km
- Total length of network: 22869 km
- Provisional Accuracy: 1.03 mm * √S, where S is in [km]
- Precise leveling requirements: Second Order / Class I according to National Geodetic Survey (NGS) Standards Data
- Information provided for each benchmark: Orthometric Height in KSA-VRF14 & Description Card.
NVN is connected to the National Tide Gauge Network: (https://www.gcs.gov.sa/en/pages/ntgnundermaintenance.aspx)
National Vertical Network Map with approximate locations (KMZ)
To get data from NVN, follow steps described below:
- Download National Vertical Network (NVN) map in KMZ format.
Select required benchmarks located in the area of your interest.
Request the data you need by using the email address: firstname.lastname@example.org
using the information described above.