Re: [gdal-dev] NLCD images and north

2013-12-20 Thread Jo Meder
Hi David, On 20/12/2013, at 7:38 AM, David Strip wrote: > Once again, open the raster in qgis. You get an apparently rotated patch > that is slightly tapered towards the top. This is how the projection > renders for this part of the world (Washington, DC). Now click > View->Decorations->North Arr

Re: [gdal-dev] NLCD images and north

2013-12-19 Thread Kurtis Nelson
On 12/19/2013 2:02 PM, David Strip wrote: On 12/19/2013 11:38 AM, David Strip wrote: On 12/19/2013 2:18 AM, Jo Meder wrote: Can you clarify that last part for me please? Are you saying that the data should be aligned north up based on the .tfw file? The geotransform from GDAL also suggested t

Re: [gdal-dev] NLCD images and north

2013-12-19 Thread David Strip
On 12/19/2013 11:38 AM, David Strip wrote: > On 12/19/2013 2:18 AM, Jo Meder wrote: >> Can you clarify that last part for me please? Are you saying that the data >> should be aligned north up based on the .tfw file? The geotransform from >> GDAL also suggested there was no rotation. Or is it just

Re: [gdal-dev] NLCD images and north

2013-12-19 Thread David Strip
On 12/19/2013 2:18 AM, Jo Meder wrote: > Can you clarify that last part for me please? Are you saying that the data > should be aligned north up based on the .tfw file? The geotransform from GDAL > also suggested there was no rotation. Or is it just that the data is correct > for the projection

Re: [gdal-dev] NLCD images and north

2013-12-19 Thread Jo Meder
Hi David, Thanks for your help. I hadn't replied before now because I'm on the digest and I was waiting for it to come through. It never did! Seems like I'm not getting all the digests for some reason. On 10/12/2013, at 6:04 PM, David Strip wrote: > I downloaded some NLCD test data (roughly W

Re: [gdal-dev] NLCD images and north

2013-12-09 Thread David Strip
I downloaded some NLCD test data (roughly Washington DC, for what it's worth) using the NationalMap viewer and I see the apparent rotation, but actually it's not rotated. I suspect you are seeing the same phenomenon. Your download includes, among other files, a .tif file with the image, and a .tfw

[gdal-dev] NLCD images and north

2013-12-09 Thread Jo Meder
Hi, I have a land cover raster from NLCD via the USGS National Map. The actual data is rotated something like 15ยบ inside the raster. Using the API where would I start to rotate it to north up? I am presuming that the data isn't north up already, for example the Y axis of the raster doesn't actu