Hi,
I'm using a JSONfragmenter to create a polygon from an attribute containing a geojson polygon.Everything goes fine, but if I add a reprojector the geometry become out of control:
Here is a minimal example of my problem:
Solved
Reproject a geojson feature create a weird geometry
Best answer by david_r
Since you're reprojecting between the Swiss reference frames LV03 and LV95, you should not be using the Reprojector, but the ReframeReprojector that was developed by Swisstopo for this specific use case.
I just tried it with your sample workspace and the result seems correct.
Alternatively you can also use the CsmapReprojector with a specific transformation method:
It will be somewhat faster than the ReframeReprojector, but slightly less accurate.
In addition, I'm sure that i'm using the right projection. But the output coordinates of the reprojector don't make any sense.
- Best Answer
Since you're reprojecting between the Swiss reference frames LV03 and LV95, you should not be using the Reprojector, but the ReframeReprojector that was developed by Swisstopo for this specific use case.
I just tried it with your sample workspace and the result seems correct.
Alternatively you can also use the CsmapReprojector with a specific transformation method:
It will be somewhat faster than the ReframeReprojector, but slightly less accurate.
david_r wrote:
Since you're reprojecting between the Swiss reference frames LV03 and LV95, you should not be using the Reprojector, but the ReframeReprojector that was developed by Swisstopo for this specific use case.
I just tried it with your sample workspace and the result seems correct.
Alternatively you can also use the CsmapReprojector with a specific transformation method:
It will be somewhat faster than the ReframeReprojector, but slightly less accurate.
Ho, wow, thanks, indeed it works. But I still don't get why the classic reprojector doesn't work in this case? It's not the first time that I'm using a reprojector to switch between LV03 and LV95 but it's the first time that I get this error.
baschec wrote:
Ho, wow, thanks, indeed it works. But I still don't get why the classic reprojector doesn't work in this case? It's not the first time that I'm using a reprojector to switch between LV03 and LV95 but it's the first time that I get this error.
Unfortunately I have no idea about the regular Reprojector, I actually never use it. My order of preference is:
- Are the coordinates in Switzerland? ReframeReprojector
- If not, use the CsmapReprojector
Btw, the Reprojector may have inaccuracies up to about a meter compared to the ReframeReprojector, which is basically why you shouldn't use it inside Switzerland. The CsmapReprojector is much better, but may still be off by some centimeters.
david_r wrote:
Unfortunately I have no idea about the regular Reprojector, I actually never use it. My order of preference is:
- Are the coordinates in Switzerland? ReframeReprojector
- If not, use the CsmapReprojector
Btw, the Reprojector may have inaccuracies up to about a meter compared to the ReframeReprojector, which is basically why you shouldn't use it inside Switzerland. The CsmapReprojector is much better, but may still be off by some centimeters.
Oh that's really good to know, thanks a lot for those useful informations.
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