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Snapping two polygons together
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I have a problem with two vector layers, both polygons. I have been digitising an historical map which contains large areas called townlands, filled by smaller areas called fields. I digitised both as two separate vector layers, both polygons. When digitised the field layers I snapped them to the townland boundaries where the townlands and fields shared a boundary. Unfortunately I managed to shift the field layer by accident so now the fields and the townlands don’t overlap. Is there a topological function to fix this? To snap one layer of polygons back to another? I tried v.clean in the GRASS module but this only appears to work for cleaning within one layer. Thanks for any advice.
qgis topology
add a comment |
I have a problem with two vector layers, both polygons. I have been digitising an historical map which contains large areas called townlands, filled by smaller areas called fields. I digitised both as two separate vector layers, both polygons. When digitised the field layers I snapped them to the townland boundaries where the townlands and fields shared a boundary. Unfortunately I managed to shift the field layer by accident so now the fields and the townlands don’t overlap. Is there a topological function to fix this? To snap one layer of polygons back to another? I tried v.clean in the GRASS module but this only appears to work for cleaning within one layer. Thanks for any advice.
qgis topology
In FME, there is a transformer called Snapper which would make your polygons snap.
– U2ros
Sep 6 '12 at 10:57
add a comment |
I have a problem with two vector layers, both polygons. I have been digitising an historical map which contains large areas called townlands, filled by smaller areas called fields. I digitised both as two separate vector layers, both polygons. When digitised the field layers I snapped them to the townland boundaries where the townlands and fields shared a boundary. Unfortunately I managed to shift the field layer by accident so now the fields and the townlands don’t overlap. Is there a topological function to fix this? To snap one layer of polygons back to another? I tried v.clean in the GRASS module but this only appears to work for cleaning within one layer. Thanks for any advice.
qgis topology
I have a problem with two vector layers, both polygons. I have been digitising an historical map which contains large areas called townlands, filled by smaller areas called fields. I digitised both as two separate vector layers, both polygons. When digitised the field layers I snapped them to the townland boundaries where the townlands and fields shared a boundary. Unfortunately I managed to shift the field layer by accident so now the fields and the townlands don’t overlap. Is there a topological function to fix this? To snap one layer of polygons back to another? I tried v.clean in the GRASS module but this only appears to work for cleaning within one layer. Thanks for any advice.
qgis topology
qgis topology
asked Sep 6 '12 at 10:37
crichard75crichard75
8624
8624
In FME, there is a transformer called Snapper which would make your polygons snap.
– U2ros
Sep 6 '12 at 10:57
add a comment |
In FME, there is a transformer called Snapper which would make your polygons snap.
– U2ros
Sep 6 '12 at 10:57
In FME, there is a transformer called Snapper which would make your polygons snap.
– U2ros
Sep 6 '12 at 10:57
In FME, there is a transformer called Snapper which would make your polygons snap.
– U2ros
Sep 6 '12 at 10:57
add a comment |
3 Answers
3
active
oldest
votes
If you have access to ArcGIS 10 you could try the Integrate (Data Management) tool:
http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//00170000002s000000
Don't suppose you know the equivalent of this operation in QGIS/Grass?
– geotheory
Aug 12 '14 at 12:53
add a comment |
I know you are looking for a solution with qgis: there is a plugin for qgis "affin transformation", where you can enter the following values: Scale, rotation, translation both for x and y
But here I recommend to give the free openjump a try: use werkzeuge (in English: tools) -transformiere (transform) transformieren... (transform ..) you can now draw easliy as many "shifting-vectors" you need on your map-canavas to to do the required transformation/warping
the openjump tool looks good (not tried it--will involve installing yet another GIS tool :-)), but again not as easy as ShapeWarp. In SW, one could just click source and destination points, and it would gather the points and compute the trasnformation (just as in ERDAS). Any thoughts?
– Sharad
yesterday
there is a qgis plugin vector-bender - I did not try it myself - but it looks promising, you should give it a try, if you dont want to install openjump
– Kurt
yesterday
add a comment |
Thanks Kurt. I have tried to use Vector Bender. But it requires installation of additional drivers/plugins (matlab etc) and still is quite cumbersome to use. Never was able to make it work (given my limited software savvy). Just seems absurd that no one could take the steps folks have listed here (acquire point pairs, create table, feed to affine command, save results) into a nice interface!
add a comment |
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
If you have access to ArcGIS 10 you could try the Integrate (Data Management) tool:
http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//00170000002s000000
Don't suppose you know the equivalent of this operation in QGIS/Grass?
– geotheory
Aug 12 '14 at 12:53
add a comment |
If you have access to ArcGIS 10 you could try the Integrate (Data Management) tool:
http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//00170000002s000000
Don't suppose you know the equivalent of this operation in QGIS/Grass?
– geotheory
Aug 12 '14 at 12:53
add a comment |
If you have access to ArcGIS 10 you could try the Integrate (Data Management) tool:
http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//00170000002s000000
If you have access to ArcGIS 10 you could try the Integrate (Data Management) tool:
http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//00170000002s000000
answered Sep 6 '12 at 12:09
RaynerRayner
3,21811629
3,21811629
Don't suppose you know the equivalent of this operation in QGIS/Grass?
– geotheory
Aug 12 '14 at 12:53
add a comment |
Don't suppose you know the equivalent of this operation in QGIS/Grass?
– geotheory
Aug 12 '14 at 12:53
Don't suppose you know the equivalent of this operation in QGIS/Grass?
– geotheory
Aug 12 '14 at 12:53
Don't suppose you know the equivalent of this operation in QGIS/Grass?
– geotheory
Aug 12 '14 at 12:53
add a comment |
I know you are looking for a solution with qgis: there is a plugin for qgis "affin transformation", where you can enter the following values: Scale, rotation, translation both for x and y
But here I recommend to give the free openjump a try: use werkzeuge (in English: tools) -transformiere (transform) transformieren... (transform ..) you can now draw easliy as many "shifting-vectors" you need on your map-canavas to to do the required transformation/warping
the openjump tool looks good (not tried it--will involve installing yet another GIS tool :-)), but again not as easy as ShapeWarp. In SW, one could just click source and destination points, and it would gather the points and compute the trasnformation (just as in ERDAS). Any thoughts?
– Sharad
yesterday
there is a qgis plugin vector-bender - I did not try it myself - but it looks promising, you should give it a try, if you dont want to install openjump
– Kurt
yesterday
add a comment |
I know you are looking for a solution with qgis: there is a plugin for qgis "affin transformation", where you can enter the following values: Scale, rotation, translation both for x and y
But here I recommend to give the free openjump a try: use werkzeuge (in English: tools) -transformiere (transform) transformieren... (transform ..) you can now draw easliy as many "shifting-vectors" you need on your map-canavas to to do the required transformation/warping
the openjump tool looks good (not tried it--will involve installing yet another GIS tool :-)), but again not as easy as ShapeWarp. In SW, one could just click source and destination points, and it would gather the points and compute the trasnformation (just as in ERDAS). Any thoughts?
– Sharad
yesterday
there is a qgis plugin vector-bender - I did not try it myself - but it looks promising, you should give it a try, if you dont want to install openjump
– Kurt
yesterday
add a comment |
I know you are looking for a solution with qgis: there is a plugin for qgis "affin transformation", where you can enter the following values: Scale, rotation, translation both for x and y
But here I recommend to give the free openjump a try: use werkzeuge (in English: tools) -transformiere (transform) transformieren... (transform ..) you can now draw easliy as many "shifting-vectors" you need on your map-canavas to to do the required transformation/warping
I know you are looking for a solution with qgis: there is a plugin for qgis "affin transformation", where you can enter the following values: Scale, rotation, translation both for x and y
But here I recommend to give the free openjump a try: use werkzeuge (in English: tools) -transformiere (transform) transformieren... (transform ..) you can now draw easliy as many "shifting-vectors" you need on your map-canavas to to do the required transformation/warping
answered Sep 6 '12 at 13:00
KurtKurt
4,93412339
4,93412339
the openjump tool looks good (not tried it--will involve installing yet another GIS tool :-)), but again not as easy as ShapeWarp. In SW, one could just click source and destination points, and it would gather the points and compute the trasnformation (just as in ERDAS). Any thoughts?
– Sharad
yesterday
there is a qgis plugin vector-bender - I did not try it myself - but it looks promising, you should give it a try, if you dont want to install openjump
– Kurt
yesterday
add a comment |
the openjump tool looks good (not tried it--will involve installing yet another GIS tool :-)), but again not as easy as ShapeWarp. In SW, one could just click source and destination points, and it would gather the points and compute the trasnformation (just as in ERDAS). Any thoughts?
– Sharad
yesterday
there is a qgis plugin vector-bender - I did not try it myself - but it looks promising, you should give it a try, if you dont want to install openjump
– Kurt
yesterday
the openjump tool looks good (not tried it--will involve installing yet another GIS tool :-)), but again not as easy as ShapeWarp. In SW, one could just click source and destination points, and it would gather the points and compute the trasnformation (just as in ERDAS). Any thoughts?
– Sharad
yesterday
the openjump tool looks good (not tried it--will involve installing yet another GIS tool :-)), but again not as easy as ShapeWarp. In SW, one could just click source and destination points, and it would gather the points and compute the trasnformation (just as in ERDAS). Any thoughts?
– Sharad
yesterday
there is a qgis plugin vector-bender - I did not try it myself - but it looks promising, you should give it a try, if you dont want to install openjump
– Kurt
yesterday
there is a qgis plugin vector-bender - I did not try it myself - but it looks promising, you should give it a try, if you dont want to install openjump
– Kurt
yesterday
add a comment |
Thanks Kurt. I have tried to use Vector Bender. But it requires installation of additional drivers/plugins (matlab etc) and still is quite cumbersome to use. Never was able to make it work (given my limited software savvy). Just seems absurd that no one could take the steps folks have listed here (acquire point pairs, create table, feed to affine command, save results) into a nice interface!
add a comment |
Thanks Kurt. I have tried to use Vector Bender. But it requires installation of additional drivers/plugins (matlab etc) and still is quite cumbersome to use. Never was able to make it work (given my limited software savvy). Just seems absurd that no one could take the steps folks have listed here (acquire point pairs, create table, feed to affine command, save results) into a nice interface!
add a comment |
Thanks Kurt. I have tried to use Vector Bender. But it requires installation of additional drivers/plugins (matlab etc) and still is quite cumbersome to use. Never was able to make it work (given my limited software savvy). Just seems absurd that no one could take the steps folks have listed here (acquire point pairs, create table, feed to affine command, save results) into a nice interface!
Thanks Kurt. I have tried to use Vector Bender. But it requires installation of additional drivers/plugins (matlab etc) and still is quite cumbersome to use. Never was able to make it work (given my limited software savvy). Just seems absurd that no one could take the steps folks have listed here (acquire point pairs, create table, feed to affine command, save results) into a nice interface!
answered 4 mins ago
SharadSharad
814
814
add a comment |
add a comment |
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In FME, there is a transformer called Snapper which would make your polygons snap.
– U2ros
Sep 6 '12 at 10:57