Exposé d’anglais Maxime Bourdet Maxime Bergeret Sylvain Andrieu Maxime Bargetto Le 19/03/09.
LUCAS Monitoring the European Union territory using a grid approach Maxime KAYADJANIAN Eurostat F-2.
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Transcript of LUCAS Monitoring the European Union territory using a grid approach Maxime KAYADJANIAN Eurostat F-2.
![Page 1: LUCAS Monitoring the European Union territory using a grid approach Maxime KAYADJANIAN Eurostat F-2.](https://reader036.fdocuments.us/reader036/viewer/2022081519/56649dd15503460f94ac7add/html5/thumbnails/1.jpg)
LUCAS
LUCAS Monitoring the European Union territory
using a grid approach
Maxime KAYADJANIANEurostat F-2
![Page 2: LUCAS Monitoring the European Union territory using a grid approach Maxime KAYADJANIAN Eurostat F-2.](https://reader036.fdocuments.us/reader036/viewer/2022081519/56649dd15503460f94ac7add/html5/thumbnails/2.jpg)
LUCAS
100 000 points systematically sampled
LUCAS Grid
Reason: compromise between budget and required statistical representativity at EU level
![Page 3: LUCAS Monitoring the European Union territory using a grid approach Maxime KAYADJANIAN Eurostat F-2.](https://reader036.fdocuments.us/reader036/viewer/2022081519/56649dd15503460f94ac7add/html5/thumbnails/3.jpg)
LUCAS
Why a systematic GRID ?
LUCAS Grid
LUCAS is a multipurpose system for monitoring:
• Land Use / Land cover
• Landscape and Environmental features
Reason: all the territory has to be covered the same way to ensure equiprobabilty of observations
![Page 4: LUCAS Monitoring the European Union territory using a grid approach Maxime KAYADJANIAN Eurostat F-2.](https://reader036.fdocuments.us/reader036/viewer/2022081519/56649dd15503460f94ac7add/html5/thumbnails/4.jpg)
LUCAS
300 m
300
m
Specifications
LUCAS Grid
A two-stage sampling GRID
10.000 PSU 10 SSU
Reason: optimizing trip for visiting points in the field
X
![Page 5: LUCAS Monitoring the European Union territory using a grid approach Maxime KAYADJANIAN Eurostat F-2.](https://reader036.fdocuments.us/reader036/viewer/2022081519/56649dd15503460f94ac7add/html5/thumbnails/5.jpg)
LUCAS
Particular case
LUCAS Grid
Italy Spain
Reason: complying with already existing national system
MAST system
Distance inter PSU =
• 20 km (not 18 km)
AGRIT system
Distance inter SSU =
• 300 m east-west
• 500m north-south
![Page 6: LUCAS Monitoring the European Union territory using a grid approach Maxime KAYADJANIAN Eurostat F-2.](https://reader036.fdocuments.us/reader036/viewer/2022081519/56649dd15503460f94ac7add/html5/thumbnails/6.jpg)
LUCAS
Construction of the GRID
![Page 7: LUCAS Monitoring the European Union territory using a grid approach Maxime KAYADJANIAN Eurostat F-2.](https://reader036.fdocuments.us/reader036/viewer/2022081519/56649dd15503460f94ac7add/html5/thumbnails/7.jpg)
LUCAS
Construction (1/3)
LUCAS Grid
Choice of projection
system:
GRS80 + UTM
One sampling plan per
country to limit ground
distortion
![Page 8: LUCAS Monitoring the European Union territory using a grid approach Maxime KAYADJANIAN Eurostat F-2.](https://reader036.fdocuments.us/reader036/viewer/2022081519/56649dd15503460f94ac7add/html5/thumbnails/8.jpg)
LUCAS
Construction (2/3)
LUCAS Grid
Grid generated in the UTM zone of the country
Origin chosen pseudo-randomly Total coverage of country
![Page 9: LUCAS Monitoring the European Union territory using a grid approach Maxime KAYADJANIAN Eurostat F-2.](https://reader036.fdocuments.us/reader036/viewer/2022081519/56649dd15503460f94ac7add/html5/thumbnails/9.jpg)
LUCAS
Construction (3/3)
LUCAS Grid
SSUs selected according to SABE and SCOLE (© Megrin) boundaries
Selection of SSUs Uncompleted PSUs
![Page 10: LUCAS Monitoring the European Union territory using a grid approach Maxime KAYADJANIAN Eurostat F-2.](https://reader036.fdocuments.us/reader036/viewer/2022081519/56649dd15503460f94ac7add/html5/thumbnails/10.jpg)
LUCAS
Geometrical quality of the sampling plan
LUCAS Grid
![Page 11: LUCAS Monitoring the European Union territory using a grid approach Maxime KAYADJANIAN Eurostat F-2.](https://reader036.fdocuments.us/reader036/viewer/2022081519/56649dd15503460f94ac7add/html5/thumbnails/11.jpg)
LUCAS
Geometrical quality of the sampling plan
LUCAS Grid
Are points regularly spread on the ground?
N
S
18 km18 km
N
S
18 km
18 km ?
EW
N
S
18 km
Once grid generated... …in the UTM projection system...
…how much ground distance is affected ?
![Page 12: LUCAS Monitoring the European Union territory using a grid approach Maxime KAYADJANIAN Eurostat F-2.](https://reader036.fdocuments.us/reader036/viewer/2022081519/56649dd15503460f94ac7add/html5/thumbnails/12.jpg)
LUCAS
LUCAS Grid
Largest line of PSUs in France...
24,05
24,10
24,15
24,20
24,25
24,30
24,35
24,40
24,45
24,50
4 9 14 19 24 29 34 39 44 49 54
n° PSU
1/10
0 d
egre
e
Meridian 30 Meridian 31-3° +3°
PSU col n°
…shows a longitudinal angle reduction apart from central meridian
- 45m
…it corresponds to a reduction of 45m on the ground 500 km apart from central meridian.
Geometrical quality of the sampling plan
![Page 13: LUCAS Monitoring the European Union territory using a grid approach Maxime KAYADJANIAN Eurostat F-2.](https://reader036.fdocuments.us/reader036/viewer/2022081519/56649dd15503460f94ac7add/html5/thumbnails/13.jpg)
LUCAS
LUCAS Grid
How many points are affected by distortion ?
Point out of central median zone 30%
Geometrical quality of the sampling plan
Conclusion: distortions are negligible for statistical estimates
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LUCAS
The case of SPAIN (MAST)
No distortion but small gaps
LUCAS Grid
Geometrical quality of the sampling plan
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LUCAS
Reaching the point on the ground
LUCAS Grid
A fundamental aspect to ensure a correct monitoring
![Page 16: LUCAS Monitoring the European Union territory using a grid approach Maxime KAYADJANIAN Eurostat F-2.](https://reader036.fdocuments.us/reader036/viewer/2022081519/56649dd15503460f94ac7add/html5/thumbnails/16.jpg)
LUCAS
Reaching the point on the ground
3 basic tools
LUCAS Grid
3/ GPS for navigating along transects
1/ Topographical maps for navigating between PSUs
2/ Aerial photo for reaching precisely the SSU
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LUCAS
Reaching the point on the ground
LUCAS Grid
Observation unit
Point location
10 m
0.5 / 2.5 m
1 m
3 m
GPS
DGPS
Image resolution
Orthophoto
5 m Map: 1/25 000
1 m
Positional accuracy
3 m
At the point: observation in a 3 m window
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LUCAS
Reaching the point on the ground
LUCAS Grid
Country Resolution /Scale
Year Type Use ofGPS
AT 0,5 m 1990/2000 Orthophoto Yes
BE 1 m 1995/2000 Orthophoto Yes
DE 0,25 to 0,8 m
>1995Orthophoto
& aerial photoyes +DGPS
DK 0,4m 1999 Orthophoto yes
ES 0,75 to 2 m
1985/2000Orthophoto
& aerial photono
FI 1 m 1996 Orthophoto yes
FR 0,5 to 1 m >1995Orthophoto
& aerial photono
GR 1 m 1990/1998 Orthophoto yes
IT 1 m ? Orthophoto yes
LU 1/5000 1997 Topogr. map yes
NL 1m >1995 Orthophoto DGPS
PT 1 m 2000 Orthophoto yes
SE 1 m >1995 Orthophoto Yes
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LUCAS
Implementation problem
Projection of UTM x,y into national system
LUCAS Grid
Systematic shift of about 200 m between GPS co-ordinates and location on the photo detected during the ground mission control, in:
• Luxembourg: specific parameters for datum
• Greece & Portugal: bug in the GIS soft
For these countries the original sampling plan has been corrected in return
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LUCAS
Conclusion
• Reaching the point: Good quality of field document
• Location of points: only minor distortion in the sampling plan (no impact on estimates)
• Well documented
LUCAS can be considered as a strong system: