Transcript Production of digital orthophoto in Bosnia Herzegovina

Production of digital
orthophoto for “Geographic
Information System for Mine
Action”
2nd Workshop of SEEMACC GIS GROUP in ITF
Slovenia
M.Sc. Vasja Bric, Geodetski zavod Slovenije d.d.
Contents
•
•
•
•
•
•
project organisation
overview of the project
statistics of the project
problems and solutions
results
future improvements
V.Bric, GZS d.d. 2nd Workshop of
SEEMACC GIS GROUP
2
Project organisation
• Aerial photography of the area (GZS)
• Planning of ground control points (GZS)
• Marking, measurement, computation and
transformation of GCPs (BHMAC)
• Orthophoto production (GZS) (scanning,
aerialtriangulation, DTM, orthophoto
computation, mosaicing, finalisation)
V.Bric, GZS d.d. 2nd Workshop of
SEEMACC GIS GROUP
3
Overview of the project
• Two areas:
– Lašva 1:2500 and 1:1000 (same area)
– Pelagičevo 1:2500
– Scale of aerial survey:
• map scale 1:2500 - photo scale 1:12500
• map scale 1:1000 - photo scale 1:5000
V.Bric, GZS d.d. 2nd Workshop of
SEEMACC GIS GROUP
4
Lašva 1:2500
V.Bric, GZS d.d. 2nd Workshop of
SEEMACC GIS GROUP
5
Lašva 1:1000
V.Bric, GZS d.d. 2nd Workshop of
SEEMACC GIS GROUP
6
Pelagičevo 1:2500
V.Bric, GZS d.d. 2nd Workshop of
SEEMACC GIS GROUP
7
Statistics
Area
no. of
GCPs
no. of tie
points
no. of
images
RMS on
GCPs
Lašva
1:2500
30
1120
180
Y
X
Z
0.08 m
0.08 m
0.18 m
Lašva
1:1000
40
562
157
Y
X
Z
0.05 m
0.05 m
0.10 m
Pelagičevo
1:2500
39
886
274
Y
X
Z
0.04 m
0.04 m
0.03 m
V.Bric, GZS d.d. 2nd Workshop of
SEEMACC GIS GROUP
8
Problems and solutions
• marking of GCPs
• measurements of natural detail
• GCP accuracy
• GSD (1 pixel on the ground)
• 1:2500 (2.25x1.5 km) if GSD is 0.10m 338 MB
• 1:1000 (0.75x0.5 km) if GSD is 0.05m 150 MB
V.Bric, GZS d.d. 2nd Workshop of
SEEMACC GIS GROUP
9
Natural detail for a GCP
V.Bric, GZS d.d. 2nd Workshop of
SEEMACC GIS GROUP
10
Results
• Orthophoto
– Number of sheets:
• Lašva 1:2500
84 (x 338 MB is 28.4 GB)
• Lašva 1:1000
128 (x 150 MB is 19.2 GB)
• Pelagičevo 1:2500 134 (x 338 MB is 45.3 GB)
• DTM (grid, characteristic lines and spot heights)
V.Bric, GZS d.d. 2nd Workshop of
SEEMACC GIS GROUP
11
Orthophoto Lašva 1:1000
V.Bric, GZS d.d. 2nd Workshop of
SEEMACC GIS GROUP
12
Orthophoto Lašva 1:1000
V.Bric, GZS d.d. 2nd Workshop of
SEEMACC GIS GROUP
13
Orthophoto Lašva 1:1000
V.Bric, GZS d.d. 2nd Workshop of
SEEMACC GIS GROUP
14
DTM
V.Bric, GZS d.d. 2nd Workshop of
SEEMACC GIS GROUP
15
Future improvements
•
•
•
•
•
•
planning all activities (time of aerial survey)
planning of aero-triangulation
marking of GCPs and measurements
aerial survey
additional field work (missing GCPs)
transformation parameters from governmental
to WGS84 system
V.Bric, GZS d.d. 2nd Workshop of
SEEMACC GIS GROUP
16