How to create a GCP (*.points) file from a Shapefile (points layer)Georeferencing scanned map using...
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How to create a GCP (*.points) file from a Shapefile (points layer)
Georeferencing scanned map using ArcMap?How to set up QGIS + georeferencer for easiest georeferencingHow to start from scanned maps in qgisWith QGIS, how can I create a layer from a .csv file?Re-projecting ground control points of similar images (Georeferencing in QGIS)Problem in loading map to Georeferencer in QGISQGIS: georeferencer, resolution-dependent behaviour, why resolution is negativeChange project CRS = discard GCPs?Editing/adding GCPs using QGIS?QGIS 2.18 Georeferencer
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I have created a points layer which represent Ground Control Points (GCP) for georeferencing scanned topographic maps via 'Add Layer > Add Delimited Text Layer', where I saved coordinates in a .csv format that has the lat-lon of each point, stored in DMS coordinate system (I am using DMS as the scanned topo maps use DMS).
I have managed to load the .csv as a Shapefile. Now, I open up the Georeferencer, load the scanned topo map, and click 'File > Load GCP points', however it requires a Ground Control Point file with the *.points extension, and not a Shapefile.
I would prefer not to manually reassign all the control points. How do I convert a Shapefile to a GCP (.points) file? If that is not possible, how do I create a GCP (.points) file? What file formats can I use to create the required GCP (.points) file?
My goal is to be able to load it into the Georeferencer. I am using QGIS 3.2.1.
When I change the extension of the .shp to .points, it becomes a POINTS file (.points), but QGIS will prompt me the following; "Invalid GCP file. File could not be read."
qgis georeferencing ground-control
asked Nov 12 '18 at 7:14
JohannessJohanness
965
bumped to the homepage by Community♦ 17 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
I have created a points layer which represent Ground Control Points (GCP) for georeferencing scanned topographic maps via 'Add Layer > Add Delimited Text Layer', where I saved coordinates in a .csv format that has the lat-lon of each point, stored in DMS coordinate system (I am using DMS as the scanned topo maps use DMS).
I have managed to load the .csv as a Shapefile. Now, I open up the Georeferencer, load the scanned topo map, and click 'File > Load GCP points', however it requires a Ground Control Point file with the *.points extension, and not a Shapefile.
I would prefer not to manually reassign all the control points. How do I convert a Shapefile to a GCP (.points) file? If that is not possible, how do I create a GCP (.points) file? What file formats can I use to create the required GCP (.points) file?
My goal is to be able to load it into the Georeferencer. I am using QGIS 3.2.1.
When I change the extension of the .shp to .points, it becomes a POINTS file (.points), but QGIS will prompt me the following; "Invalid GCP file. File could not be read."
qgis georeferencing ground-control
asked Nov 12 '18 at 7:14
JohannessJohanness
965
bumped to the homepage by Community♦ 17 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
Does your shapefile already contain the information about which pixel, expressed as rows and columns, is under each GCP?
– user30184
Nov 12 '18 at 7:52
No, it does not have the which pixel row and column a point belongs to. It only has the lat-lon in DMS coordinates.
– Johanness
Nov 12 '18 at 8:01
If you do not have extremely many GCP's I think it is easiest and fastest to insert them again with the QGIS georeferencer.
– user30184
Nov 14 '18 at 7:22
add a comment |
I have created a points layer which represent Ground Control Points (GCP) for georeferencing scanned topographic maps via 'Add Layer > Add Delimited Text Layer', where I saved coordinates in a .csv format that has the lat-lon of each point, stored in DMS coordinate system (I am using DMS as the scanned topo maps use DMS).
I have managed to load the .csv as a Shapefile. Now, I open up the Georeferencer, load the scanned topo map, and click 'File > Load GCP points', however it requires a Ground Control Point file with the *.points extension, and not a Shapefile.
I would prefer not to manually reassign all the control points. How do I convert a Shapefile to a GCP (.points) file? If that is not possible, how do I create a GCP (.points) file? What file formats can I use to create the required GCP (.points) file?
My goal is to be able to load it into the Georeferencer. I am using QGIS 3.2.1.
When I change the extension of the .shp to .points, it becomes a POINTS file (.points), but QGIS will prompt me the following; "Invalid GCP file. File could not be read."
qgis georeferencing ground-control
asked Nov 12 '18 at 7:14
JohannessJohanness
965
I have created a points layer which represent Ground Control Points (GCP) for georeferencing scanned topographic maps via 'Add Layer > Add Delimited Text Layer', where I saved coordinates in a .csv format that has the lat-lon of each point, stored in DMS coordinate system (I am using DMS as the scanned topo maps use DMS).
I have managed to load the .csv as a Shapefile. Now, I open up the Georeferencer, load the scanned topo map, and click 'File > Load GCP points', however it requires a Ground Control Point file with the *.points extension, and not a Shapefile.
I would prefer not to manually reassign all the control points. How do I convert a Shapefile to a GCP (.points) file? If that is not possible, how do I create a GCP (.points) file? What file formats can I use to create the required GCP (.points) file?
My goal is to be able to load it into the Georeferencer. I am using QGIS 3.2.1.
When I change the extension of the .shp to .points, it becomes a POINTS file (.points), but QGIS will prompt me the following; "Invalid GCP file. File could not be read."
qgis georeferencing ground-control
qgis georeferencing ground-control
asked Nov 12 '18 at 7:14
JohannessJohanness
965
asked Nov 12 '18 at 7:14
JohannessJohanness
965
edited Nov 12 '18 at 8:03
Johanness
asked Nov 12 '18 at 7:14
JohannessJohanness
965
asked Nov 12 '18 at 7:14
JohannessJohanness
965
asked Nov 12 '18 at 7:14
JohannessJohanness
965
965
bumped to the homepage by Community♦ 17 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
bumped to the homepage by Community♦ 17 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
Does your shapefile already contain the information about which pixel, expressed as rows and columns, is under each GCP?
– user30184
Nov 12 '18 at 7:52
No, it does not have the which pixel row and column a point belongs to. It only has the lat-lon in DMS coordinates.
– Johanness
Nov 12 '18 at 8:01
If you do not have extremely many GCP's I think it is easiest and fastest to insert them again with the QGIS georeferencer.
– user30184
Nov 14 '18 at 7:22
add a comment |
Does your shapefile already contain the information about which pixel, expressed as rows and columns, is under each GCP?
– user30184
Nov 12 '18 at 7:52
No, it does not have the which pixel row and column a point belongs to. It only has the lat-lon in DMS coordinates.
– Johanness
Nov 12 '18 at 8:01
If you do not have extremely many GCP's I think it is easiest and fastest to insert them again with the QGIS georeferencer.
– user30184
Nov 14 '18 at 7:22
Does your shapefile already contain the information about which pixel, expressed as rows and columns, is under each GCP?
– user30184
Nov 12 '18 at 7:52
Does your shapefile already contain the information about which pixel, expressed as rows and columns, is under each GCP?
– user30184
Nov 12 '18 at 7:52
No, it does not have the which pixel row and column a point belongs to. It only has the lat-lon in DMS coordinates.
– Johanness
Nov 12 '18 at 8:01
No, it does not have the which pixel row and column a point belongs to. It only has the lat-lon in DMS coordinates.
– Johanness
Nov 12 '18 at 8:01
If you do not have extremely many GCP's I think it is easiest and fastest to insert them again with the QGIS georeferencer.
– user30184
Nov 14 '18 at 7:22
If you do not have extremely many GCP's I think it is easiest and fastest to insert them again with the QGIS georeferencer.
– user30184
Nov 14 '18 at 7:22
add a comment |
1 Answer
1
active
oldest
votes
how do I create a GCP (.points) file?
You could use a text editor.
The format you want is like:
mapX,mapY,pixelX,pixelY,enable
433268.37959376286016777,355509.77655098377726972,983.9774984446378312,-2014.51289408103730239,1
433246.04284725664183497,355552.3686015487764962,831.61904507316751278,-1719.29808785451632502,1
433306.56253424676833674,355622.24824787728721276,1234.15815910973515201,-1236.85959025535225919,1
433411.46138055482879281,355677.74274208577116951,1955.41727764171605486,-850.47783687136427488,1
433554.34018561965785921,355695.8543699209112674,2953.81013592618046459,-710.01017688100557734,1
433636.94680135982343927,355569.64276779681676999,3522.92258485503180054,-1576.07810653126352918,1
433600.53707709873560816,355540.0109893383923918,3268.11243895852203423,-1781.04650243362743822,1
433454.43287125352071598,355434.66971611470216885,2264.11336592998168271,-2498.8375497027768688,1
433346.00189347146078944,355440.21874731522984803,1527.95157730500841353,-2474.08382017634630756,1
answered Nov 12 '18 at 8:23
nmtokennmtoken
8,15542866
Okay nmtoken, but how do I get those values for pixelX, pixelY by using my GCPs and a non-georeferenced raster (scanned) map? I only have the lat-lon coordinates of my GCPs in DMS coordinate system.
– Johanness
Nov 12 '18 at 9:08
add a comment |
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1 Answer
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1 Answer
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how do I create a GCP (.points) file?
You could use a text editor.
The format you want is like:
mapX,mapY,pixelX,pixelY,enable
433268.37959376286016777,355509.77655098377726972,983.9774984446378312,-2014.51289408103730239,1
433246.04284725664183497,355552.3686015487764962,831.61904507316751278,-1719.29808785451632502,1
433306.56253424676833674,355622.24824787728721276,1234.15815910973515201,-1236.85959025535225919,1
433411.46138055482879281,355677.74274208577116951,1955.41727764171605486,-850.47783687136427488,1
433554.34018561965785921,355695.8543699209112674,2953.81013592618046459,-710.01017688100557734,1
433636.94680135982343927,355569.64276779681676999,3522.92258485503180054,-1576.07810653126352918,1
433600.53707709873560816,355540.0109893383923918,3268.11243895852203423,-1781.04650243362743822,1
433454.43287125352071598,355434.66971611470216885,2264.11336592998168271,-2498.8375497027768688,1
433346.00189347146078944,355440.21874731522984803,1527.95157730500841353,-2474.08382017634630756,1
answered Nov 12 '18 at 8:23
nmtokennmtoken
8,15542866
Okay nmtoken, but how do I get those values for pixelX, pixelY by using my GCPs and a non-georeferenced raster (scanned) map? I only have the lat-lon coordinates of my GCPs in DMS coordinate system.
– Johanness
Nov 12 '18 at 9:08
add a comment |
how do I create a GCP (.points) file?
You could use a text editor.
The format you want is like:
mapX,mapY,pixelX,pixelY,enable
433268.37959376286016777,355509.77655098377726972,983.9774984446378312,-2014.51289408103730239,1
433246.04284725664183497,355552.3686015487764962,831.61904507316751278,-1719.29808785451632502,1
433306.56253424676833674,355622.24824787728721276,1234.15815910973515201,-1236.85959025535225919,1
433411.46138055482879281,355677.74274208577116951,1955.41727764171605486,-850.47783687136427488,1
433554.34018561965785921,355695.8543699209112674,2953.81013592618046459,-710.01017688100557734,1
433636.94680135982343927,355569.64276779681676999,3522.92258485503180054,-1576.07810653126352918,1
433600.53707709873560816,355540.0109893383923918,3268.11243895852203423,-1781.04650243362743822,1
433454.43287125352071598,355434.66971611470216885,2264.11336592998168271,-2498.8375497027768688,1
433346.00189347146078944,355440.21874731522984803,1527.95157730500841353,-2474.08382017634630756,1
answered Nov 12 '18 at 8:23
nmtokennmtoken
8,15542866
Okay nmtoken, but how do I get those values for pixelX, pixelY by using my GCPs and a non-georeferenced raster (scanned) map? I only have the lat-lon coordinates of my GCPs in DMS coordinate system.
– Johanness
Nov 12 '18 at 9:08
add a comment |
how do I create a GCP (.points) file?
You could use a text editor.
The format you want is like:
mapX,mapY,pixelX,pixelY,enable
433268.37959376286016777,355509.77655098377726972,983.9774984446378312,-2014.51289408103730239,1
433246.04284725664183497,355552.3686015487764962,831.61904507316751278,-1719.29808785451632502,1
433306.56253424676833674,355622.24824787728721276,1234.15815910973515201,-1236.85959025535225919,1
433411.46138055482879281,355677.74274208577116951,1955.41727764171605486,-850.47783687136427488,1
433554.34018561965785921,355695.8543699209112674,2953.81013592618046459,-710.01017688100557734,1
433636.94680135982343927,355569.64276779681676999,3522.92258485503180054,-1576.07810653126352918,1
433600.53707709873560816,355540.0109893383923918,3268.11243895852203423,-1781.04650243362743822,1
433454.43287125352071598,355434.66971611470216885,2264.11336592998168271,-2498.8375497027768688,1
433346.00189347146078944,355440.21874731522984803,1527.95157730500841353,-2474.08382017634630756,1
answered Nov 12 '18 at 8:23
nmtokennmtoken
8,15542866
how do I create a GCP (.points) file?
You could use a text editor.
The format you want is like:
mapX,mapY,pixelX,pixelY,enable
433268.37959376286016777,355509.77655098377726972,983.9774984446378312,-2014.51289408103730239,1
433246.04284725664183497,355552.3686015487764962,831.61904507316751278,-1719.29808785451632502,1
433306.56253424676833674,355622.24824787728721276,1234.15815910973515201,-1236.85959025535225919,1
433411.46138055482879281,355677.74274208577116951,1955.41727764171605486,-850.47783687136427488,1
433554.34018561965785921,355695.8543699209112674,2953.81013592618046459,-710.01017688100557734,1
433636.94680135982343927,355569.64276779681676999,3522.92258485503180054,-1576.07810653126352918,1
433600.53707709873560816,355540.0109893383923918,3268.11243895852203423,-1781.04650243362743822,1
433454.43287125352071598,355434.66971611470216885,2264.11336592998168271,-2498.8375497027768688,1
433346.00189347146078944,355440.21874731522984803,1527.95157730500841353,-2474.08382017634630756,1
answered Nov 12 '18 at 8:23
nmtokennmtoken
8,15542866
answered Nov 12 '18 at 8:23
nmtokennmtoken
8,15542866
answered Nov 12 '18 at 8:23
nmtokennmtoken
8,15542866
answered Nov 12 '18 at 8:23
nmtokennmtoken
8,15542866
8,15542866
Okay nmtoken, but how do I get those values for pixelX, pixelY by using my GCPs and a non-georeferenced raster (scanned) map? I only have the lat-lon coordinates of my GCPs in DMS coordinate system.
– Johanness
Nov 12 '18 at 9:08
add a comment |
Okay nmtoken, but how do I get those values for pixelX, pixelY by using my GCPs and a non-georeferenced raster (scanned) map? I only have the lat-lon coordinates of my GCPs in DMS coordinate system.
– Johanness
Nov 12 '18 at 9:08
Okay nmtoken, but how do I get those values for pixelX, pixelY by using my GCPs and a non-georeferenced raster (scanned) map? I only have the lat-lon coordinates of my GCPs in DMS coordinate system.
– Johanness
Nov 12 '18 at 9:08
Okay nmtoken, but how do I get those values for pixelX, pixelY by using my GCPs and a non-georeferenced raster (scanned) map? I only have the lat-lon coordinates of my GCPs in DMS coordinate system.
– Johanness
Nov 12 '18 at 9:08
add a comment |
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Does your shapefile already contain the information about which pixel, expressed as rows and columns, is under each GCP?
– user30184
Nov 12 '18 at 7:52
No, it does not have the which pixel row and column a point belongs to. It only has the lat-lon in DMS coordinates.
– Johanness
Nov 12 '18 at 8:01
If you do not have extremely many GCP's I think it is easiest and fastest to insert them again with the QGIS georeferencer.
– user30184
Nov 14 '18 at 7:22