hepos a look at the transformation between the etrf and the greek reference geodetic system inf...
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![Page 1: HEPOS A look at the Transformation Between the ETRF and the Greek Reference Geodetic System INF -2357 Vaios Balis – Christos Liapakis Geotech Ltd](https://reader037.vdocuments.us/reader037/viewer/2022110103/56649f155503460f94c2b0b1/html5/thumbnails/1.jpg)
HEPOSA look at the Transformation
Between the ETRF and the Greek Reference Geodetic System
INF -2357
Vaios Balis – Christos Liapakis
Geotech Ltd
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Projects’ identification Supervising authority:
KTIMATOLOGIO SA
“… responsible for the design, implementation and operation of the Greek Cadastral”
Projects: – HEPOS-SUPPLY– HEPOS-MEAS
Projects co-financed by the European Union under the operational programme “Information society”
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HEPOS SUPPLY “Supply, installation and maintenance of the
fully operational and turnkey HEllenic POsitioning System – HEPOS”
Contractor: Trimble Europe B.V. Sub-contractors
– Geotech Ltd Site Location Installation Operation support
– OTENET SA Communication provider
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HEPOS SUPPLY Reference stations: 100 (± 5) Duration of the project: 2 years Installation : 7 months
– Site location– Reference station installation– Control center installation – Communications
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HEPOS SUPPLY
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HEPOS SUPPLY 98 stations 2 networks 11 single RS
ETRF-2005
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GGRS 87 Greek Geodetic Reference System 1987 Parallel to WGS 84
– Accuracy ~ 1 x 10-5
Origin offset from WGS– +199.723 m– -74.030 m– -246.018 m
Projection– Transverse Mercator– Central Meridian: 24º– Scale along central Meridian: 0.9996
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HEPOS MEAS – Scope of the work “GPS measurements on control points of the
Greek National Triangulation Network and calculation of their coordinates in HEPOS reference system (ETRF 2005, epoch 2007.5)”
“Calculation of 7-parameter transformation from HEPOS reference system to GGRS 87 and vice versa”
Contractor: JV Ceotech – Topomet Duration : 10 months !!!!
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Points to be measured How many points per 1:50000 scale map sheet ?
1:50000 scale map sheet
~ 28 km
~ 22 km
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1:50000 scale map sheets How many 1:50000 map sheets ?
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Total number of points How many points ?
– 8 per each map sheet 1:50000 scale– 387 1: 50000 scale map sheets– or roughly 2800 points to be measured
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Specifications– L1/L2 GPS receivers– Occupation time: 1 hour– Logging interval: 15 sec– Elevation mask : 15º– 6 satellites tracked : 90% of session time – PDOP < 4 : 75% of session time– 1 Primary base station – REF (24 hours logging)– 1 Secondary base station – SEC (logging until all 8
points of the map sheet have been measured)
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GPS measurements
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Resources 10 survey crews 2 people per survey crew 5800 L1/L2 receivers with ACU Handheld GPS for Guidance Cameras for documentation 4 WD for transportation Daily data transfers to the office 3 months field work 9 months office work
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Pre-survey office work
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Some measured points
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Some non measured points
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Total measured points
2470 points
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Measured point documentation
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TGO projects
128 TGO projects
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7 parameter transformation TTC SW
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Transformation residuals
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•Transformation accuracy 1:50000 scale map sheets
– Horizontal Mean value = ± 3 cm Max Value = ± 5 cm
– Vertical Mean value = ± 6 cm Max Value = ± 8 cm
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•Transformation accuracy 1:100000 scale map sheets
– Horizontal Mean value = ± 6 cm Max Value = ± 9 cm
– Vertical Mean value = ± 10 cm Max Value = ± 17 cm
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7 parameter transformation (global)
TTC SW
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Residuals
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Residuals – North Greece
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Residuals - Islands
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Residuals – West Greece
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Residuals – Central Creece
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Residuals – North East Greece
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Shift grid files
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Shift grid files
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Geoid
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Accuracy
HEPOS vs GGRS'87 (m)
0,037 -0,040 -0,031
0,014 -0,050 0,012
-0,007 -0,049 0,009
0,017 -0,033 -0,035
0,028 -0,028 -0,037
0,022 -0,025 -0,039
0,017 -0,055 -0,006
0,010 -0,046 -0,029
0,017 -0,041 -0,020
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Survey controller application
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Thank you for your attention…
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Questions