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Re-projecting WGS84 to OSGB in SAGAGIS
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I took some points with a GPS, and I'm trying to convert from GCS to OSGB 1936 British National Grid in SAGAGIS. I'm working with a shapefile. To reproject the vector layer to the OSGB projection I have used Proj. 4 (Command Line Arguments, Shapes).
Once the vector layer is reprojected, I loaded a .tif image to check that the projected points lie in their correct places. I set its projection using Proj.4 --> Set Coordinate Reference System.
However, when I try to overlay layer with the image, and the shapefile with the re-projected data, I can't overlay properly, and only appear the layer with the gps points but not the image.
So my question is: How can I overlay those two properly in order to check that the points are in the adequate place?
Sorry for the question, it could be a beginner one, but I appreciate any help!
coordinate-system wgs84 saga
asked Feb 10 '14 at 22:51
KrahsinKrahsin
658
add a comment |
I took some points with a GPS, and I'm trying to convert from GCS to OSGB 1936 British National Grid in SAGAGIS. I'm working with a shapefile. To reproject the vector layer to the OSGB projection I have used Proj. 4 (Command Line Arguments, Shapes).
Once the vector layer is reprojected, I loaded a .tif image to check that the projected points lie in their correct places. I set its projection using Proj.4 --> Set Coordinate Reference System.
However, when I try to overlay layer with the image, and the shapefile with the re-projected data, I can't overlay properly, and only appear the layer with the gps points but not the image.
So my question is: How can I overlay those two properly in order to check that the points are in the adequate place?
Sorry for the question, it could be a beginner one, but I appreciate any help!
coordinate-system wgs84 saga
asked Feb 10 '14 at 22:51
KrahsinKrahsin
658
add a comment |
I took some points with a GPS, and I'm trying to convert from GCS to OSGB 1936 British National Grid in SAGAGIS. I'm working with a shapefile. To reproject the vector layer to the OSGB projection I have used Proj. 4 (Command Line Arguments, Shapes).
Once the vector layer is reprojected, I loaded a .tif image to check that the projected points lie in their correct places. I set its projection using Proj.4 --> Set Coordinate Reference System.
However, when I try to overlay layer with the image, and the shapefile with the re-projected data, I can't overlay properly, and only appear the layer with the gps points but not the image.
So my question is: How can I overlay those two properly in order to check that the points are in the adequate place?
Sorry for the question, it could be a beginner one, but I appreciate any help!
coordinate-system wgs84 saga
asked Feb 10 '14 at 22:51
KrahsinKrahsin
658
I took some points with a GPS, and I'm trying to convert from GCS to OSGB 1936 British National Grid in SAGAGIS. I'm working with a shapefile. To reproject the vector layer to the OSGB projection I have used Proj. 4 (Command Line Arguments, Shapes).
Once the vector layer is reprojected, I loaded a .tif image to check that the projected points lie in their correct places. I set its projection using Proj.4 --> Set Coordinate Reference System.
However, when I try to overlay layer with the image, and the shapefile with the re-projected data, I can't overlay properly, and only appear the layer with the gps points but not the image.
So my question is: How can I overlay those two properly in order to check that the points are in the adequate place?
Sorry for the question, it could be a beginner one, but I appreciate any help!
coordinate-system wgs84 saga
coordinate-system wgs84 saga
asked Feb 10 '14 at 22:51
KrahsinKrahsin
658
asked Feb 10 '14 at 22:51
KrahsinKrahsin
658
asked Feb 10 '14 at 22:51
KrahsinKrahsin
658
asked Feb 10 '14 at 22:51
KrahsinKrahsin
658
asked Feb 10 '14 at 22:51
KrahsinKrahsin
658
658
add a comment |
add a comment |
1 Answer
1
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You did not tell the CRS of the image, but the lack of information itself tells that you missed the first step to deal with a non-georeferenced image.
The tool you used on the image Set Coordinate Reference System does set the CRS information by over-riding existing metadata. However, it does nothing if there is no metadata to be modified.
Follow these steps:
- Activate Define Georeference for Grids (under
Projection > Georeferencing). - Check the Grid system of your input image. Most likely you will see only column / row numbers, and it does not have cell size or extent information. Define cell size and origin (lower-left or upper-left corner) and run the tool. You will obtain a raster with grid definition, with a blank CRS.
- Activate Set Coordinate Reference System and run the tool to assign appropriate CRS to the raster.
Should the shapefile reprojected correctly, the (georeferenced) image will overlay properly.
answered 11 mins ago
KazuhitoKazuhito
16.1k41883
add a comment |
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1 Answer
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1 Answer
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active
oldest
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active
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active
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votes
You did not tell the CRS of the image, but the lack of information itself tells that you missed the first step to deal with a non-georeferenced image.
The tool you used on the image Set Coordinate Reference System does set the CRS information by over-riding existing metadata. However, it does nothing if there is no metadata to be modified.
Follow these steps:
- Activate Define Georeference for Grids (under
Projection > Georeferencing). - Check the Grid system of your input image. Most likely you will see only column / row numbers, and it does not have cell size or extent information. Define cell size and origin (lower-left or upper-left corner) and run the tool. You will obtain a raster with grid definition, with a blank CRS.
- Activate Set Coordinate Reference System and run the tool to assign appropriate CRS to the raster.
Should the shapefile reprojected correctly, the (georeferenced) image will overlay properly.
answered 11 mins ago
KazuhitoKazuhito
16.1k41883
add a comment |
You did not tell the CRS of the image, but the lack of information itself tells that you missed the first step to deal with a non-georeferenced image.
The tool you used on the image Set Coordinate Reference System does set the CRS information by over-riding existing metadata. However, it does nothing if there is no metadata to be modified.
Follow these steps:
- Activate Define Georeference for Grids (under
Projection > Georeferencing). - Check the Grid system of your input image. Most likely you will see only column / row numbers, and it does not have cell size or extent information. Define cell size and origin (lower-left or upper-left corner) and run the tool. You will obtain a raster with grid definition, with a blank CRS.
- Activate Set Coordinate Reference System and run the tool to assign appropriate CRS to the raster.
Should the shapefile reprojected correctly, the (georeferenced) image will overlay properly.
answered 11 mins ago
KazuhitoKazuhito
16.1k41883
add a comment |
You did not tell the CRS of the image, but the lack of information itself tells that you missed the first step to deal with a non-georeferenced image.
The tool you used on the image Set Coordinate Reference System does set the CRS information by over-riding existing metadata. However, it does nothing if there is no metadata to be modified.
Follow these steps:
- Activate Define Georeference for Grids (under
Projection > Georeferencing). - Check the Grid system of your input image. Most likely you will see only column / row numbers, and it does not have cell size or extent information. Define cell size and origin (lower-left or upper-left corner) and run the tool. You will obtain a raster with grid definition, with a blank CRS.
- Activate Set Coordinate Reference System and run the tool to assign appropriate CRS to the raster.
Should the shapefile reprojected correctly, the (georeferenced) image will overlay properly.
answered 11 mins ago
KazuhitoKazuhito
16.1k41883
You did not tell the CRS of the image, but the lack of information itself tells that you missed the first step to deal with a non-georeferenced image.
The tool you used on the image Set Coordinate Reference System does set the CRS information by over-riding existing metadata. However, it does nothing if there is no metadata to be modified.
Follow these steps:
- Activate Define Georeference for Grids (under
Projection > Georeferencing). - Check the Grid system of your input image. Most likely you will see only column / row numbers, and it does not have cell size or extent information. Define cell size and origin (lower-left or upper-left corner) and run the tool. You will obtain a raster with grid definition, with a blank CRS.
- Activate Set Coordinate Reference System and run the tool to assign appropriate CRS to the raster.
Should the shapefile reprojected correctly, the (georeferenced) image will overlay properly.
answered 11 mins ago
KazuhitoKazuhito
16.1k41883
answered 11 mins ago
KazuhitoKazuhito
16.1k41883
answered 11 mins ago
KazuhitoKazuhito
16.1k41883
answered 11 mins ago
KazuhitoKazuhito
16.1k41883
16.1k41883
add a comment |
add a comment |
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