[GRASS-user] Need help in reprojecting raster images

[Veronica Andreo]

Hi Uttam,

you may want to first do v.in.region in your input location, this creates a
vector with the limits of your input location (set g.region to your raster
of interest first), then v.proj the output of v.in.region in your target
location, set region there with the imported vector and just then try to
reproject the raster image.

so, steps would be:

# in input_location
g.region raster=your_raster

v.in.region output=vector_region_of_interest

# in target location
v.proj location=input_location mapset=input_mapset
input=vector_region_of_interest output=projected_boundaries

g.region vector=projected_boundaries

r.proj location=input_location mapset=input_mapset input=input_raster
output=output_raster

You may also wanna check r.import if you use grass7.1 (
https://grass.osgeo.org/grass71/manuals/r.import.html) or as an add-on in
grass 7.0 (https://grass.osgeo.org/grass70/manuals/addons/r.import.html).
You can install it with g.extension r.import

HTH,
Vero

2015-09-23 15:21 GMT-03:00 Uttam Sinha <uttamsinha09 at gmail.com>:

>
>
> Hi,
>
> I tried the way you told. I created a new location in laea without setting
> the default boundary. Then from this mapset I used
>
> r.proj location*=input_location* mapset=*input_mapset* input=*input_raster
> name* output=
>
> *output_raster*
> I get an error:
>
>
> ERROR: Input raster map is outside current region
>
> Any suggestions.
>
> Uttam.
>
>
> On Tue, Sep 22, 2015 at 11:59 PM, sajid pareeth <spareeth at gmail.com>
> wrote:
>
>> Hi Uttam
>>
>> If I understand you correctly you want to reproject a landsat image from
>> sinusoidal to laea projection!!
>> You dont have to manually set the bounding box while reprojecting a
>> raster, as GRASS will take care of it.
>>
>> First you create a new location and mapset with desired output projection
>> , which in this case is Lamberts Azimuthal Equal Area.
>> Then get into this mapset, use the following r.proj command.
>> r.proj location*=input_location* mapset=*input_mapset* input=*input_raster
>> name* output=
>> *output_raster*
>>
>> More details here: https://grass.osgeo.org/grass70/manuals/r.proj.html
>>
>> If you then need to set your working area to a particular bounding box,
>> use g.region
>>
>> g.region raster=*output_raster*
>>
>> regards
>>
>> Sajid
>>
>> On Tue, Sep 22, 2015 at 11:07 PM, Uttam Sinha <uttamsinha09 at gmail.com>
>> wrote:
>>
>>>
>>>
>>> Hi All,
>>>
>>> I have a set of Landsat images in Sinusoidal Projection, WGS84 Datum. I
>>> know the north, south, east and west extent of the boundary of the image.
>>>
>>> I want to reproject the image to Lamberts Azimuthal Equal Area, WGS84
>>> Datum. I do not know what will be the coordinates of the north, south, east
>>> and west bounds in this projection.
>>>
>>> 1.) How do I convert upper left coordinates and bottom right coordinates
>>> of Sinusoidal Projection to  Lamberts Azimuthal Equal Area to create a new
>>> destination Location?
>>>
>>> 2.) How do I reproject the images from Sinusoidal to Lamberts without
>>> georeferencing the image at source location (in sinusoidal projection)
>>>
>>> Appreciate any reply.
>>>
>>> Uttam.
>>>
>>> _______________________________________________
>>> grass-user mailing list
>>> grass-user at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/grass-user
>>>
>>
>>
>
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