Georeferenced images not lining up correctly with one another in QGIS?
Clash Royale CLAN TAG#URR8PPP
After georeferencing these 3 images onto my basemap (openstreetmap) they do not line up (see how the white lines are mismatching). Why is this the case and how can I solve this problem?
I made sure that when georeferencing I referenced at least 4 points on the basemap. It seems that the images get compressed or expanded, but I do not see why?
I tried alignment tool in QGIS 3.4.2 but this did not work.
I added transparency the georeferenced images so you can see the problem. Along some streets the images lines up perfectly with the underlying Openstreetmap, but then (in the right hand corner the image gets bend direction southeast and the white line does not align with the underlying street.
In the transformation settings I also use WGS 84 – pseudo Mercator (the same CRS as used for the whole project).
qgis georeferencing
edited Jan 27 at 22:02
PolyGeo♦
53.5k1780239
asked Jan 25 at 14:59
Matthias RMatthias R
162
add a comment |
After georeferencing these 3 images onto my basemap (openstreetmap) they do not line up (see how the white lines are mismatching). Why is this the case and how can I solve this problem?
I made sure that when georeferencing I referenced at least 4 points on the basemap. It seems that the images get compressed or expanded, but I do not see why?
I tried alignment tool in QGIS 3.4.2 but this did not work.
I added transparency the georeferenced images so you can see the problem. Along some streets the images lines up perfectly with the underlying Openstreetmap, but then (in the right hand corner the image gets bend direction southeast and the white line does not align with the underlying street.
In the transformation settings I also use WGS 84 – pseudo Mercator (the same CRS as used for the whole project).
qgis georeferencing
edited Jan 27 at 22:02
PolyGeo♦
53.5k1780239
asked Jan 25 at 14:59
Matthias RMatthias R
162
Did you check the residuals after georeferencing? Did you repeat georeferencing?
– Zoltan
Jan 25 at 15:12
4 points is likely not enough either, especially if the sources are from varying projection systems.
– HeikkiVesanto
Jan 25 at 15:18
1
I notice that the off-image is slanted, even leaving a gap on your map. This is often indicative of a projection mismatch between some inputs.
– jpmc26
Jan 25 at 20:46
I used WGS 84 - pseudo mercator for both the basemap and for the images I want to georeference onto the basemap
– Matthias R
Jan 27 at 12:00
add a comment |
After georeferencing these 3 images onto my basemap (openstreetmap) they do not line up (see how the white lines are mismatching). Why is this the case and how can I solve this problem?
I made sure that when georeferencing I referenced at least 4 points on the basemap. It seems that the images get compressed or expanded, but I do not see why?
I tried alignment tool in QGIS 3.4.2 but this did not work.
I added transparency the georeferenced images so you can see the problem. Along some streets the images lines up perfectly with the underlying Openstreetmap, but then (in the right hand corner the image gets bend direction southeast and the white line does not align with the underlying street.
In the transformation settings I also use WGS 84 – pseudo Mercator (the same CRS as used for the whole project).
qgis georeferencing
edited Jan 27 at 22:02
PolyGeo♦
53.5k1780239
asked Jan 25 at 14:59
Matthias RMatthias R
162
After georeferencing these 3 images onto my basemap (openstreetmap) they do not line up (see how the white lines are mismatching). Why is this the case and how can I solve this problem?
I made sure that when georeferencing I referenced at least 4 points on the basemap. It seems that the images get compressed or expanded, but I do not see why?
I tried alignment tool in QGIS 3.4.2 but this did not work.
I added transparency the georeferenced images so you can see the problem. Along some streets the images lines up perfectly with the underlying Openstreetmap, but then (in the right hand corner the image gets bend direction southeast and the white line does not align with the underlying street.
In the transformation settings I also use WGS 84 – pseudo Mercator (the same CRS as used for the whole project).
qgis georeferencing
qgis georeferencing
edited Jan 27 at 22:02
PolyGeo♦
53.5k1780239
asked Jan 25 at 14:59
Matthias RMatthias R
162
edited Jan 27 at 22:02
PolyGeo♦
53.5k1780239
asked Jan 25 at 14:59
Matthias RMatthias R
162
edited Jan 27 at 22:02
PolyGeo♦
53.5k1780239
edited Jan 27 at 22:02
PolyGeo♦
53.5k1780239
edited Jan 27 at 22:02
PolyGeo♦
53.5k1780239
53.5k1780239
asked Jan 25 at 14:59
Matthias RMatthias R
162
asked Jan 25 at 14:59
Matthias RMatthias R
162
asked Jan 25 at 14:59
Matthias RMatthias R
162
162
Did you check the residuals after georeferencing? Did you repeat georeferencing?
– Zoltan
Jan 25 at 15:12
4 points is likely not enough either, especially if the sources are from varying projection systems.
– HeikkiVesanto
Jan 25 at 15:18
1
I notice that the off-image is slanted, even leaving a gap on your map. This is often indicative of a projection mismatch between some inputs.
– jpmc26
Jan 25 at 20:46
I used WGS 84 - pseudo mercator for both the basemap and for the images I want to georeference onto the basemap
– Matthias R
Jan 27 at 12:00
add a comment |
Did you check the residuals after georeferencing? Did you repeat georeferencing?
– Zoltan
Jan 25 at 15:12
4 points is likely not enough either, especially if the sources are from varying projection systems.
– HeikkiVesanto
Jan 25 at 15:18
1
I notice that the off-image is slanted, even leaving a gap on your map. This is often indicative of a projection mismatch between some inputs.
– jpmc26
Jan 25 at 20:46
I used WGS 84 - pseudo mercator for both the basemap and for the images I want to georeference onto the basemap
– Matthias R
Jan 27 at 12:00
Did you check the residuals after georeferencing? Did you repeat georeferencing?
– Zoltan
Jan 25 at 15:12
Did you check the residuals after georeferencing? Did you repeat georeferencing?
– Zoltan
Jan 25 at 15:12
4 points is likely not enough either, especially if the sources are from varying projection systems.
– HeikkiVesanto
Jan 25 at 15:18
4 points is likely not enough either, especially if the sources are from varying projection systems.
– HeikkiVesanto
Jan 25 at 15:18
1
1
I notice that the off-image is slanted, even leaving a gap on your map. This is often indicative of a projection mismatch between some inputs.
– jpmc26
Jan 25 at 20:46
I notice that the off-image is slanted, even leaving a gap on your map. This is often indicative of a projection mismatch between some inputs.
– jpmc26
Jan 25 at 20:46
I used WGS 84 - pseudo mercator for both the basemap and for the images I want to georeference onto the basemap
– Matthias R
Jan 27 at 12:00
I used WGS 84 - pseudo mercator for both the basemap and for the images I want to georeference onto the basemap
– Matthias R
Jan 27 at 12:00
add a comment |
2 Answers
2
active
oldest
votes
They are two possibilities (or maybe more):
- The chosen points are too close. ->Choose points in each corner of the image.
- You didn't choose the same coordinates system with the three images. ->See the coordinates of the points, if they are too different, the coordinates systems are possibly different too.
answered Jan 25 at 15:14
geekornolifegeekornolife
61115
4
another possibility is that the images are not orthorectified and have lot of distortion
– J.R
Jan 25 at 17:32
add a comment |
If we assume that you have done all the operations correctly, when you are working with Aerial images that cover vast areas you will need more than four points for georeferencing an Image. The underlying algorithm actually treats the Image as a rectangular plane, While in vast areas you are faced with a strongly curved earth. And of course, you have to have the elevation effect in mind.
So, try adding more reference points along all four sides of your image and on the bold features that you have on your base map then the problem will be solved.
answered Jan 27 at 22:25
Afshin SalehiAfshin Salehi
451114
add a comment |
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2 Answers
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active
oldest
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2 Answers
2
active
oldest
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votes
They are two possibilities (or maybe more):
- The chosen points are too close. ->Choose points in each corner of the image.
- You didn't choose the same coordinates system with the three images. ->See the coordinates of the points, if they are too different, the coordinates systems are possibly different too.
answered Jan 25 at 15:14
geekornolifegeekornolife
61115
4
another possibility is that the images are not orthorectified and have lot of distortion
– J.R
Jan 25 at 17:32
add a comment |
They are two possibilities (or maybe more):
- The chosen points are too close. ->Choose points in each corner of the image.
- You didn't choose the same coordinates system with the three images. ->See the coordinates of the points, if they are too different, the coordinates systems are possibly different too.
answered Jan 25 at 15:14
geekornolifegeekornolife
61115
4
another possibility is that the images are not orthorectified and have lot of distortion
– J.R
Jan 25 at 17:32
add a comment |
They are two possibilities (or maybe more):
- The chosen points are too close. ->Choose points in each corner of the image.
- You didn't choose the same coordinates system with the three images. ->See the coordinates of the points, if they are too different, the coordinates systems are possibly different too.
answered Jan 25 at 15:14
geekornolifegeekornolife
61115
They are two possibilities (or maybe more):
- The chosen points are too close. ->Choose points in each corner of the image.
- You didn't choose the same coordinates system with the three images. ->See the coordinates of the points, if they are too different, the coordinates systems are possibly different too.
answered Jan 25 at 15:14
geekornolifegeekornolife
61115
edited Jan 25 at 17:22
answered Jan 25 at 15:14
geekornolifegeekornolife
61115
answered Jan 25 at 15:14
geekornolifegeekornolife
61115
answered Jan 25 at 15:14
geekornolifegeekornolife
61115
61115
4
another possibility is that the images are not orthorectified and have lot of distortion
– J.R
Jan 25 at 17:32
add a comment |
4
another possibility is that the images are not orthorectified and have lot of distortion
– J.R
Jan 25 at 17:32
4
4
another possibility is that the images are not orthorectified and have lot of distortion
– J.R
Jan 25 at 17:32
another possibility is that the images are not orthorectified and have lot of distortion
– J.R
Jan 25 at 17:32
add a comment |
If we assume that you have done all the operations correctly, when you are working with Aerial images that cover vast areas you will need more than four points for georeferencing an Image. The underlying algorithm actually treats the Image as a rectangular plane, While in vast areas you are faced with a strongly curved earth. And of course, you have to have the elevation effect in mind.
So, try adding more reference points along all four sides of your image and on the bold features that you have on your base map then the problem will be solved.
answered Jan 27 at 22:25
Afshin SalehiAfshin Salehi
451114
add a comment |
If we assume that you have done all the operations correctly, when you are working with Aerial images that cover vast areas you will need more than four points for georeferencing an Image. The underlying algorithm actually treats the Image as a rectangular plane, While in vast areas you are faced with a strongly curved earth. And of course, you have to have the elevation effect in mind.
So, try adding more reference points along all four sides of your image and on the bold features that you have on your base map then the problem will be solved.
answered Jan 27 at 22:25
Afshin SalehiAfshin Salehi
451114
add a comment |
If we assume that you have done all the operations correctly, when you are working with Aerial images that cover vast areas you will need more than four points for georeferencing an Image. The underlying algorithm actually treats the Image as a rectangular plane, While in vast areas you are faced with a strongly curved earth. And of course, you have to have the elevation effect in mind.
So, try adding more reference points along all four sides of your image and on the bold features that you have on your base map then the problem will be solved.
answered Jan 27 at 22:25
Afshin SalehiAfshin Salehi
451114
If we assume that you have done all the operations correctly, when you are working with Aerial images that cover vast areas you will need more than four points for georeferencing an Image. The underlying algorithm actually treats the Image as a rectangular plane, While in vast areas you are faced with a strongly curved earth. And of course, you have to have the elevation effect in mind.
So, try adding more reference points along all four sides of your image and on the bold features that you have on your base map then the problem will be solved.
answered Jan 27 at 22:25
Afshin SalehiAfshin Salehi
451114
answered Jan 27 at 22:25
Afshin SalehiAfshin Salehi
451114
answered Jan 27 at 22:25
Afshin SalehiAfshin Salehi
451114
answered Jan 27 at 22:25
Afshin SalehiAfshin Salehi
451114
451114
add a comment |
add a comment |
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Did you check the residuals after georeferencing? Did you repeat georeferencing?
– Zoltan
Jan 25 at 15:12
4 points is likely not enough either, especially if the sources are from varying projection systems.
– HeikkiVesanto
Jan 25 at 15:18
1
I notice that the off-image is slanted, even leaving a gap on your map. This is often indicative of a projection mismatch between some inputs.
– jpmc26
Jan 25 at 20:46
I used WGS 84 - pseudo mercator for both the basemap and for the images I want to georeference onto the basemap
– Matthias R
Jan 27 at 12:00