Why do my georeferenced images not line up correctly with one another? QGIS 3.4.2












1















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?
enter image description here
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.






qgis georeferencing







share|improve this question

























  • Did you check the residuals after georeferencing? Did you repeat georeferencing?

    – Zoltan
    3 hours ago











  • 4 points is likely not enough either, especially if the sources are from varying projection systems.

    – HeikkiVesanto
    3 hours ago
















1















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?
enter image description here
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.






qgis georeferencing







share|improve this question

























  • Did you check the residuals after georeferencing? Did you repeat georeferencing?

    – Zoltan
    3 hours ago











  • 4 points is likely not enough either, especially if the sources are from varying projection systems.

    – HeikkiVesanto
    3 hours ago














1












1








1








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?
enter image description here
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.






qgis georeferencing







share|improve this question
















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?
enter image description here
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.






qgis georeferencing




qgis georeferencing






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 3 hours ago









Andy

1,101414




1,101414










asked 4 hours ago









Matthias RMatthias R

112




112













  • Did you check the residuals after georeferencing? Did you repeat georeferencing?

    – Zoltan
    3 hours ago











  • 4 points is likely not enough either, especially if the sources are from varying projection systems.

    – HeikkiVesanto
    3 hours ago



















  • Did you check the residuals after georeferencing? Did you repeat georeferencing?

    – Zoltan
    3 hours ago











  • 4 points is likely not enough either, especially if the sources are from varying projection systems.

    – HeikkiVesanto
    3 hours ago

















Did you check the residuals after georeferencing? Did you repeat georeferencing?

– Zoltan
3 hours ago





Did you check the residuals after georeferencing? Did you repeat georeferencing?

– Zoltan
3 hours ago













4 points is likely not enough either, especially if the sources are from varying projection systems.

– HeikkiVesanto
3 hours ago





4 points is likely not enough either, especially if the sources are from varying projection systems.

– HeikkiVesanto
3 hours ago










1 Answer
1






active

oldest

votes


















4














They are two possibilities (or maybe more):




  1. The chosen points are too close. ->Choose points in each corner of the image.

  2. 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.






share|improve this answer





















  • 1





    another possibility is that the images are not orthorectified and have lot of distortion

    – J.R
    1 hour ago











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1 Answer
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active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









4














They are two possibilities (or maybe more):




  1. The chosen points are too close. ->Choose points in each corner of the image.

  2. 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.






share|improve this answer





















  • 1





    another possibility is that the images are not orthorectified and have lot of distortion

    – J.R
    1 hour ago
















4














They are two possibilities (or maybe more):




  1. The chosen points are too close. ->Choose points in each corner of the image.

  2. 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.






share|improve this answer





















  • 1





    another possibility is that the images are not orthorectified and have lot of distortion

    – J.R
    1 hour ago














4












4








4







They are two possibilities (or maybe more):




  1. The chosen points are too close. ->Choose points in each corner of the image.

  2. 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.






share|improve this answer















They are two possibilities (or maybe more):




  1. The chosen points are too close. ->Choose points in each corner of the image.

  2. 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.







share|improve this answer














share|improve this answer



share|improve this answer








edited 1 hour ago

























answered 3 hours ago









geekornolifegeekornolife

6515




6515








  • 1





    another possibility is that the images are not orthorectified and have lot of distortion

    – J.R
    1 hour ago














  • 1





    another possibility is that the images are not orthorectified and have lot of distortion

    – J.R
    1 hour ago








1




1





another possibility is that the images are not orthorectified and have lot of distortion

– J.R
1 hour ago





another possibility is that the images are not orthorectified and have lot of distortion

– J.R
1 hour ago


















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