Discussion:
[otb-users] Question about OrthoRectification
felicia monti
2018-05-03 10:01:19 UTC
Permalink
Hello all,

I'm a graduating student and for my dissertation I'm trying to orthorectify a QuickBird satellite image, which I think is an ortho-ready product, so I add the "?&skipcarto=true" at the end of the input image filename.


First, I used the application otbgui_ReadImageInfo and I got:


Image general informations:

Number of bands : 1

Start index : [0,0]

Size : [21948,17320]

Origin : [0.5,0.5]

Spacing : [1,1]

Estimated ground spacing (in meters): [0.698578,0.701359]



Image acquisition informations:

Sensor :

Image identification number:

Country : Italy

Town : Cretaio



Image footprint coordinates:

Upper left corner (latitude, longitude) = [40.7882,13.8442]

Upper right corner (latitude, longitude) = [40.7899,14.0263]

Lower left corner (latitude, longitude) = [40.679,13.8461]

Lower right corner (latitude, longitude) = [40.6807,14.0278]



Image default RGB composition:

[R, G, B] = [0,1,2]



Ground control points information:

Number of GCPs = 0

GCPs projection =




instead the dem I'm using is:



Image general informations:

Number of bands : 1

Start index : [0,0]

Size : [20001,12001]

Origin : [13.8509,40.7616]

Spacing : [5.80956e-006,-5.79988e-006]

Estimated ground spacing (in meters): [0.489746,0.644903]



Image acquisition informations:

Sensor :

Image identification number:

Image projection : GEOGCS["WGS 84",

DATUM["WGS_1984",

SPHEROID["WGS 84",6378137,298.257223563,

AUTHORITY["EPSG","7030"]],

AUTHORITY["EPSG","6326"]],

PRIMEM["Greenwich",0],

UNIT["degree",0.0174532925199433],

AUTHORITY["EPSG","4326"]]



Image default RGB composition:

[R, G, B] = [0,1,2]



Ground control points information:

Number of GCPs = 0

GCPs projection =



at the end of the orthorectification with otbgui_OrthoRectification I get the image correctly orthorectified, but moved about 40 m to the North-East. What is the reason for this shift?


Thank you in advance

Felicia
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Michel Julien
2018-05-03 11:01:42 UTC
Permalink
Hi,

Is your DEM with respect to ellipsoid or geoid ? All computation in OTB are done with respect to the ellispoid, so if your DEM is with respect to geoid, you need to add a geoid file.

Regards,

Julien


De : otb-***@googlegroups.com [mailto:otb-***@googlegroups.com] De la part de felicia monti
Envoyé : jeudi 3 mai 2018 12:01
À : otb-users <otb-***@googlegroups.com>
Objet : [otb-users] Question about OrthoRectification


Hello all,

I'm a graduating student and for my dissertation I'm trying to orthorectify a QuickBird satellite image, which I think is an ortho-ready product, so I add the "?&skipcarto=true" at the end of the input image filename.

First, I used the application otbgui_ReadImageInfo and I got:


Image general informations:

Number of bands : 1

Start index : [0,0]

Size : [21948,17320]

Origin : [0.5,0.5]

Spacing : [1,1]

Estimated ground spacing (in meters): [0.698578,0.701359]



Image acquisition informations:

Sensor :

Image identification number:

Country : Italy

Town : Cretaio



Image footprint coordinates:

Upper left corner (latitude, longitude) = [40.7882,13.8442]

Upper right corner (latitude, longitude) = [40.7899,14.0263]

Lower left corner (latitude, longitude) = [40.679,13.8461]

Lower right corner (latitude, longitude) = [40.6807,14.0278]



Image default RGB composition:

[R, G, B] = [0,1,2]



Ground control points information:

Number of GCPs = 0

GCPs projection =





instead the dem I'm using is:



Image general informations:

Number of bands : 1

Start index : [0,0]

Size : [20001,12001]

Origin : [13.8509,40.7616]

Spacing : [5.80956e-006,-5.79988e-006]

Estimated ground spacing (in meters): [0.489746,0.644903]



Image acquisition informations:

Sensor :

Image identification number:

Image projection : GEOGCS["WGS 84",

DATUM["WGS_1984",

SPHEROID["WGS 84",6378137,298.257223563,

AUTHORITY["EPSG","7030"]],

AUTHORITY["EPSG","6326"]],

PRIMEM["Greenwich",0],

UNIT["degree",0.0174532925199433],

AUTHORITY["EPSG","4326"]]



Image default RGB composition:

[R, G, B] = [0,1,2]



Ground control points information:

Number of GCPs = 0

GCPs projection =



at the end of the orthorectification with otbgui_OrthoRectification I get the image correctly orthorectified, but moved about 40 m to the North-East. What is the reason for this shift?



Thank you in advance

Felicia
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felicia monti
2018-05-04 13:22:56 UTC
Permalink
Hi! Thanks for the quick reply. In fact I used dem respect to the geoid. So, I added the EGM96 Geoid Model as a geoid file (The Trimble Format GGF file: Ww15mgh.ggf). Unfortunately, the result does not change. Where am I wrong?
Thank you
Post by Michel Julien
Hi,
Is your DEM with respect to ellipsoid or geoid ? All computation in OTB
are done with respect to the ellispoid, so if your DEM is with respect to
geoid, you need to add a geoid file.
Regards,
Julien
*Envoyé :* jeudi 3 mai 2018 12:01
*Objet :* [otb-users] Question about OrthoRectification
Hello all,
I'm a graduating student and for my dissertation I'm trying to orthorectify a QuickBird satellite image, which I think is an ortho-ready product, so I add the "?&skipcarto=true" at the end of the input image filename.
Number of bands : 1
Start index : [0,0]
Size : [21948,17320]
Origin : [0.5,0.5]
Spacing : [1,1]
Estimated ground spacing (in meters): [0.698578,0.701359]
Country : Italy
Town : Cretaio
Upper left corner (latitude, longitude) = [40.7882,13.8442]
Upper right corner (latitude, longitude) = [40.7899,14.0263]
Lower left corner (latitude, longitude) = [40.679,13.8461]
Lower right corner (latitude, longitude) = [40.6807,14.0278]
[R, G, B] = [0,1,2]
Number of GCPs = 0
GCPs projection =
Number of bands : 1
Start index : [0,0]
Size : [20001,12001]
Origin : [13.8509,40.7616]
Spacing : [5.80956e-006,-5.79988e-006]
Estimated ground spacing (in meters): [0.489746,0.644903]
Image projection : GEOGCS["WGS 84",
DATUM["WGS_1984",
SPHEROID["WGS 84",6378137,298.257223563,
AUTHORITY["EPSG","7030"]],
AUTHORITY["EPSG","6326"]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433],
AUTHORITY["EPSG","4326"]]
[R, G, B] = [0,1,2]
Number of GCPs = 0
GCPs projection =
at the end of the orthorectification with otbgui_OrthoRectification I get the image correctly orthorectified, but moved about 40 m to the North-East. What is the reason for this shift?
Thank you in advance
Felicia
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Michel Julien
2018-05-04 13:24:46 UTC
Permalink
Can you try this one ?

https://gitlab.orfeo-toolbox.org/orfeotoolbox/otb-data/blob/master/Input/DEM/egm96.grd

De : otb-***@googlegroups.com [mailto:otb-***@googlegroups.com] De la part de felicia monti
Envoyé : vendredi 4 mai 2018 15:23
À : otb-users <otb-***@googlegroups.com>
Objet : Re: [otb-users] Question about OrthoRectification


Hi! Thanks for the quick reply. In fact I used dem respect to the geoid. So, I added the EGM96 Geoid Model as a geoid file (The Trimble Format GGF file: Ww15mgh.ggf). Unfortunately, the result does not change. Where am I wrong?

Thank you


Le jeudi 3 mai 2018 13:01:45 UTC+2, Julien Michel a écrit :
Hi,

Is your DEM with respect to ellipsoid or geoid ? All computation in OTB are done with respect to the ellispoid, so if your DEM is with respect to geoid, you need to add a geoid file.

Regards,

Julien


De : otb-***@googlegroups.com<javascript:> [mailto:otb-***@googlegroups.com<javascript:>] De la part de felicia monti
Envoyé : jeudi 3 mai 2018 12:01
À : otb-users <otb-***@googlegroups.com<javascript:>>
Objet : [otb-users] Question about OrthoRectification


Hello all,

I'm a graduating student and for my dissertation I'm trying to orthorectify a QuickBird satellite image, which I think is an ortho-ready product, so I add the "?&skipcarto=true" at the end of the input image filename.

First, I used the application otbgui_ReadImageInfo and I got:


Image general informations:

Number of bands : 1

Start index : [0,0]

Size : [21948,17320]

Origin : [0.5,0.5]

Spacing : [1,1]

Estimated ground spacing (in meters): [0.698578,0.701359]



Image acquisition informations:

Sensor :

Image identification number:

Country : Italy

Town : Cretaio



Image footprint coordinates:

Upper left corner (latitude, longitude) = [40.7882,13.8442]

Upper right corner (latitude, longitude) = [40.7899,14.0263]

Lower left corner (latitude, longitude) = [40.679,13.8461]

Lower right corner (latitude, longitude) = [40.6807,14.0278]



Image default RGB composition:

[R, G, B] = [0,1,2]



Ground control points information:

Number of GCPs = 0

GCPs projection =





instead the dem I'm using is:



Image general informations:

Number of bands : 1

Start index : [0,0]

Size : [20001,12001]

Origin : [13.8509,40.7616]

Spacing : [5.80956e-006,-5.79988e-006]

Estimated ground spacing (in meters): [0.489746,0.644903]



Image acquisition informations:

Sensor :

Image identification number:

Image projection : GEOGCS["WGS 84",

DATUM["WGS_1984",

SPHEROID["WGS 84",6378137,298.257223563,

AUTHORITY["EPSG","7030"]],

AUTHORITY["EPSG","6326"]],

PRIMEM["Greenwich",0],

UNIT["degree",0.0174532925199433],

AUTHORITY["EPSG","4326"]]



Image default RGB composition:

[R, G, B] = [0,1,2]



Ground control points information:

Number of GCPs = 0

GCPs projection =



at the end of the orthorectification with otbgui_OrthoRectification I get the image correctly orthorectified, but moved about 40 m to the North-East. What is the reason for this shift?



Thank you in advance

Felicia
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felicia monti
2018-05-04 14:18:12 UTC
Permalink
I tried with egm96.grd, but now the orthorectified image moves about 20 m to
the North-East.
Post by Michel Julien
Can you try this one ?
https://gitlab.orfeo-toolbox.org/orfeotoolbox/otb-data/blob/master/Input/DEM/egm96.grd
*Envoyé :* vendredi 4 mai 2018 15:23
*Objet :* Re: [otb-users] Question about OrthoRectification
Hi! Thanks for the quick reply. In fact I used dem respect to the geoid. So, I added the EGM96 Geoid Model as a geoid file (The Trimble Format GGF file: Ww15mgh.ggf). Unfortunately, the result does not change. Where am I wrong?
Thank you
Hi,
Is your DEM with respect to ellipsoid or geoid ? All computation in OTB
are done with respect to the ellispoid, so if your DEM is with respect to
geoid, you need to add a geoid file.
Regards,
Julien
part de* felicia monti
*Envoyé :* jeudi 3 mai 2018 12:01
*Objet :* [otb-users] Question about OrthoRectification
Hello all,
I'm a graduating student and for my dissertation I'm trying to orthorectify a QuickBird satellite image, which I think is an ortho-ready product, so I add the "?&skipcarto=true" at the end of the input image filename.
Number of bands : 1
Start index : [0,0]
Size : [21948,17320]
Origin : [0.5,0.5]
Spacing : [1,1]
Estimated ground spacing (in meters): [0.698578,0.701359]
Country : Italy
Town : Cretaio
Upper left corner (latitude, longitude) = [40.7882,13.8442]
Upper right corner (latitude, longitude) = [40.7899,14.0263]
Lower left corner (latitude, longitude) = [40.679,13.8461]
Lower right corner (latitude, longitude) = [40.6807,14.0278]
[R, G, B] = [0,1,2]
Number of GCPs = 0
GCPs projection =
Number of bands : 1
Start index : [0,0]
Size : [20001,12001]
Origin : [13.8509,40.7616]
Spacing : [5.80956e-006,-5.79988e-006]
Estimated ground spacing (in meters): [0.489746,0.644903]
Image projection : GEOGCS["WGS 84",
DATUM["WGS_1984",
SPHEROID["WGS 84",6378137,298.257223563,
AUTHORITY["EPSG","7030"]],
AUTHORITY["EPSG","6326"]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433],
AUTHORITY["EPSG","4326"]]
[R, G, B] = [0,1,2]
Number of GCPs = 0
GCPs projection =
at the end of the orthorectification with otbgui_OrthoRectification I get the image correctly orthorectified, but moved about 40 m to the North-East. What is the reason for this shift?
Thank you in advance
Felicia
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Michel Julien
2018-05-14 08:09:28 UTC
Permalink
It looks like RefineSensorModel is working properly. All you have to do is to attach the geom file with &geom= (and maybe keep the &skipcarto= ).

Regards,

Julien

De : otb-***@googlegroups.com [mailto:otb-***@googlegroups.com] De la part de felicia monti
Envoyé : mercredi 9 mai 2018 16:48
À : otb-users <otb-***@googlegroups.com>
Objet : Re: [otb-users] Question about OrthoRectification

Hello,
I'm sorry to ask again, but I'm still not sure why the orthorectified image has moved. I tried to use RefineSensorModel and this is the output:


Application.logger (INFO) Elevation management: setting default height above ellipsoid to 0 meters



Application.logger (INFO) Elevation management: using DEM directory (C:/PCI Geomatics/ISCHIA/dem ellissoidiche)



Application.logger (INFO) Adding tie point x=9811.25, y=12489.3, z=192.886, lon=13.9266, lat=40.71



Application.logger (INFO) Adding tie point x=3073.13, y=4658.25, z=94.9557, lon=13.87, lat=40.759



Application.logger (INFO) Adding tie point x=3203.13, y=5684.88, z=96.1877, lon=13.8712, lat=40.7525



Application.logger (INFO) Adding tie point x=6283.03, y=5872.34, z=50.3759, lon=13.8969, lat=40.7517



Application.logger (INFO) Adding tie point x=2778.13, y=7387, z=56.8884, lon=13.8679, lat=40.7419



Application.logger (INFO) Adding tie point x=9813.94, y=9493.94, z=309.796, lon=13.9262, lat=40.7286



Application.logger (INFO) Adding tie point x=10916.5, y=7040.5, z=84.7389, lon=13.9353, lat=40.7446



Application.logger (INFO) Adding tie point x=13916.5, y=9061, z=46.9245, lon=13.9604, lat=40.7322



Application.logger (INFO) Adding tie point x=5748.25, y=14760.5, z=46.7507, lon=13.8933, lat=40.6956



Application.logger (INFO) Adding tie point x=3901, y=14008.3, z=107.55, lon=13.8779, lat=40.7001



Application.logger (INFO) Adding tie point x=1991.27, y=11071.4, z=50.8132, lon=13.8618, lat=40.7186



Application.logger (INFO) Adding tie point x=2290.81, y=10175.9, z=104.732, lon=13.8641, lat=40.7241



Application.logger (INFO) Adding tie point x=5909.5, y=12777.4, z=376.014, lon=13.8942, lat=40.7075



Application.logger (INFO) Adding tie point x=11897.4, y=9374.13, z=96.7412, lon=13.9437, lat=40.7299



Application.logger (INFO) Adding tie point x=6151.25, y=11096.8, z=486.252, lon=13.8959, lat=40.7178



Application.logger (INFO) Adding tie point x=3281.63, y=11819.3, z=172.781, lon=13.8725, lat=40.7137



Application.logger (INFO) Adding tie point x=13985, y=11208.5, z=224.961, lon=13.9611, lat=40.7183



Application.logger (INFO) Adding tie point x=13156.5, y=8116, z=54.5837, lon=13.954, lat=40.7381



Application.logger (INFO) Adding tie point x=2504.5, y=4929.5, z=95.1524, lon=13.8654, lat=40.7573



Application.logger (INFO) Adding tie point x=12622.9, y=10637.9, z=196.727, lon=13.9497, lat=40.7218



Application.logger (INFO) Adding tie point x=3161, y=9453.25, z=130.675, lon=13.8712, lat=40.7287



Application.logger (INFO) Optimization in progress ...



2018 May 09 16:19:21 : Application.logger (INFO) Done.





2018 May 09 16:19:21 : Application.logger (INFO) Estimation of input geom file accuracy:



2018 May 09 16:19:21 : Application.logger (INFO) Overall Root Mean Square Error: 23.9482 meters



2018 May 09 16:19:21 : Application.logger (INFO) X Mean Error: -15.1455 meters

2018 May 09 16:19:21 : Application.logger (INFO) X standard deviation: 1.12519 meters



2018 May 09 16:19:21 : Application.logger (INFO) X Root Mean Square Error: 15.1873 meters



2018 May 09 16:19:21 : Application.logger (INFO) Y Mean Error: -18.4739 meters



2018 May 09 16:19:21 : Application.logger (INFO) Y standard deviation: 1.25537 meters



2018 May 09 16:19:21 : Application.logger (INFO) Y Root Mean Square Error: 18.5165 meters





2018 May 09 16:19:21 : Application.logger (INFO) Estimation of final accuracy:



2018 May 09 16:19:21 : Application.logger (INFO) Overall Root Mean Square Error: 1.58274 meters



2018 May 09 16:19:21 : Application.logger (INFO) X Mean Error: 0.00172991 meters



2018 May 09 16:19:21 : Application.logger (INFO) X standard deviation: 0.977249 meters



2018 May 09 16:19:21 : Application.logger (INFO) X Root Mean Square Error: 0.977251 meters



2018 May 09 16:19:21 : Application.logger (INFO) Y Mean Error: 0.130209 meters



2018 May 09 16:19:21 : Application.logger (INFO) Y standard deviation: 1.23819 meters



2018 May 09 16:19:21 : Application.logger (INFO) Y Root Mean Square Error: 1.24501 meters

Then I use otbgui_OrthoRectification, should I add both “?&skipcarto” “?&geom=” in the input line?

Thank you in advance
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felicia monti
2018-05-15 15:55:10 UTC
Permalink
Yes, you must enter? & Skipcarto = true & geom =. However I have a question about the Gcps. Can I enter the ground control points only through the RefineSensorModel? Or is there another way to orthorectify using gcps? I have seen that the ground control points are inserted in the form x y lon lat, but the coordinates x y are image coordinates? Or cartographic coordinates?
Thank you
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Michel Julien
2018-05-16 06:19:51 UTC
Permalink
Yes, RefineSensorModel is the only way to add gcps, and (x,y) refers to image coordinates.

Regards,

Julien
-----Message d'origine-----
Envoyé : mardi 15 mai 2018 17:55
Objet : RE: [otb-users] Question about OrthoRectification
Yes, you must enter? & Skipcarto = true & geom =. However I have a question about the Gcps. Can I enter the ground control points
only through the RefineSensorModel? Or is there another way to orthorectify using gcps? I have seen that the ground control points
are inserted in the form x y lon lat, but the coordinates x y are image coordinates? Or cartographic coordinates?
Thank you
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felicia monti
2018-05-16 07:54:22 UTC
Permalink
Thanks for the answers. Sorry but I have another question. How do I create the gcps text file?
is there an application of orfeo? or with the geo-referencing of QGis?
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felicia monti
2018-05-23 08:53:39 UTC
Permalink
Hi,
Sorry for the insistence, but I'm still trying to solve my problem. I would
like to use the refinesensormodel application using some points detected
with gps.
I wouldn't use the homologouspointsextraction application. Is there a way
to create the text file directly from orfeo?
Thanks
Felicia
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Michel Julien
2018-05-23 08:55:39 UTC
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Yes, you can create it by hand with any text editor, provided that you comply with the format (which I believe is x y lat lon h).

Regards,

Julien

De : otb-***@googlegroups.com [mailto:otb-***@googlegroups.com] De la part de felicia monti
Envoyé : mercredi 23 mai 2018 10:54
À : otb-users <otb-***@googlegroups.com>
Objet : Re: [otb-users] Question about OrthoRectification


Hi,
Sorry for the insistence, but I'm still trying to solve my problem. I would like to use the refinesensormodel application using some points detected with gps.
I wouldn't use the homologouspointsextraction application. Is there a way to create the text file directly from orfeo?
Thanks
Felicia
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felicia monti
2018-07-03 14:33:43 UTC
Permalink
Hi! I have a question about the image coordinates x and y.
Is the origin of these coordinates at the corner of the upper left pixel,
or in the center of the pixel?
thank you
Post by Michel Julien
Yes, you can create it by hand with any text editor, provided that you
comply with the format (which I believe is x y lat lon h).
Regards,
Julien
*Envoyé :* mercredi 23 mai 2018 10:54
*Objet :* Re: [otb-users] Question about OrthoRectification
Hi,
Sorry for the insistence, but I'm still trying to solve my problem. I
would like to use the refinesensormodel application using some points
detected with gps.
I wouldn't use the homologouspointsextraction application. Is there a way
to create the text file directly from orfeo?
Thanks
Felicia
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