[GRASS-user] importing a rotated grid

GRASS GRASS user
1

Hi GRASS list,

I've been provided a raster in CSV format with the following projection information:

Lower left: 1335118.12 -183634.6
Upper left: 1830084.71 776119.12
Upper right: 2184807.4 593180.76
Lower right: 1689841.11 -366572.96

All coordinates are in Albers NAD83. Coordinates of the upper left
hand corner of the model represent row 1, column 1. The model angle of
rotation is -27.28 degrees.

Can anyone suggest how to import this into GRASS? "Albers NAD83" isn't a unique description, but more importantly, I'm not sure how to import rotated data in GRASS.

Thanks for any hints,

  -k.

2

On Tue, May 10, 2016 at 11:59 PM, Ken Mankoff <mankoff@gmail.com> wrote:

Hi GRASS list,

I've been provided a raster in CSV format with the following projection information:

Lower left: 1335118.12 -183634.6
Upper left: 1830084.71 776119.12
Upper right: 2184807.4 593180.76
Lower right: 1689841.11 -366572.96

All coordinates are in Albers NAD83. Coordinates of the upper left
hand corner of the model represent row 1, column 1. The model angle of
rotation is -27.28 degrees.

Can anyone suggest how to import this into GRASS? "Albers NAD83" isn't a unique description, but more importantly, I'm not sure how to import rotated data in GRASS.

I see two options:
* import as is, then i.rotate
  https://grass.osgeo.org/grass70/manuals/addons/i.rotate.html

* using GDAL tools, convert into eg GeoTIFF along with proper
projection information, then gdalwarp.
  Perhaps through Python calling the "geotransform" functions.
  Random links:
   - http://www.digital-geography.com/python-for-geospatial-data-analysis-part-iv/
   - http://gis.stackexchange.com/questions/131465/gdal-rotate-dem

Maybe this gets you into the right direction (other solutions may exist).

Best
Markus