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Permanent GPS Stations and their Influence on the Geodetic Surveys in Israel Gershon Steinberg Survey of Israel 1 Lincoln St. Tel-Aviv 65220, Israel Gilad Even-Tzur Mapping and Geo-Information Engineering Technion, Haifa 32000, Israel (consultant to SOI).
and their Influence on the
Geodetic Surveys in Israel
Survey of Israel
1 Lincoln St. Tel-Aviv 65220, Israel
Mapping and Geo-Information Engineering
Technion, Haifa 32000, Israel
(consultant to SOI)
Receivers: 7 Ashtech Z-XII
6 Leica SR500
5 Leica 1200 PRO
Antennas: 9 Ashtech DM
6 Leica DM
2 Topcon CR4
1 Trimble DM
Upgrade to GLONASS is coming up soon
11 stations are situated on stable roof tops
7 stations have geodynamic monumentation
The GPS receivers are connected to a control center, equipped with master and backup servers, through IPVPN connections.
1 sec sampling rate
Data is downloaded in real time
The RINEX data is gathered into 1-hour interval files and posted on the internet
The network is controlled by the RTD software.
RAMO is the official IGS station in Israel
All the data is processed at SOPAC (Scripps Orbit and Permanent Array Center)
The data from RAMO and DRAG is also processed at EPN (EUREF Permanent Network)
Active Permanent Network
In order to enable GPS surveying over the entire state of Israel with direct connection to the permanent GPS network, VRS and RTK technologies are applied.
The VRS and RTK are produced by the GEO++ software
►Each point from the APN network was connected by GPS observations to the nearest 1st order control points.
►A local datum transformation (3D) was calculated in order to assign plane coordinates to each permanent GPS station.
The accuracy of the coordinates is equivalent to the accuracy of the classical 1st order control network (~6cm)
A permanent GPS-based network is obviously more accurate, reliable and homogenous than the classical network.
Permanent GPS Network
A set of coordinates that was valid for GPS day 275 of the year 2004 (October 1st, 2004) in the ITRF2000 coordinate system was set as the fixed coordinates set for the permanent GPS stations
This set of coordinates defined a new datum for APN, called
Israel Geodetic Datum 2005
Horizontal residuals resulting from the seven parameters transformation between the ITRF2000 (IGD05) datum and the Israeli Grid
A new set of plane coordinateswere adopted for the APN points by adding the residuals of the transformation.
The new coordinates defined new datum for the Israeli Grid called:
Israel Grid 2005
official 7 parameters transformation between the two systems
A flow chart for calculating new control points in IG05 coordinate system
- Primary 3D class G
- Secondary classes:
S: horizontal coordinates.
E: ellipsoidal heights.
Goal:To examine the accuracy of orthometric height differences based on GPS measurements and OGUM in different locations in Israel.
Two alternatives for OGUM:
1. ILUM1.0 - Israeli Undulations Model, Based on 750 Benchmarks.
2. GPM98B-Global Geopotential Model (Wenzel), contains few gravity data from Israel.
For a reasonable orthometric control we actually need a height-differences accuracy of 25mm for benchmarks 1km apart: (25PPM).