[GRASS-user] exporting raster map to another projection

GRASS GRASS user
1

Dear all,

I have a a mapset on Lambert Azimuthal Equal Area projection,
and I would like to export my raster maps to another projection
(Lat/Long - WSG84 datum). I need to export my maps to
ASC format. Need I to reproject my maps first or can I
change the projection during the export?

By the way, I am running native wingrass 6.3.0 under windows/XP.

Cheers

miltinho astronauta
brazil

| |
| Type of Map: raster Number of Categories: 65535 |
| Data Type: CELL |
| Rows: 11882 |
| Columns: 9341 |
| Total Cells: 110989762 |
| Projection: Lambert Azimuthal Equal Area |
| N: 6443500 S: -5438500 Res: 1000 |
| E: 4985500 W: -4355500 Res: 1000 |
| Range of data: min = 0 max = 65535 |
| |
| Data Description: |
| generated by r.in.bin |
|

2

On Thu, 2008-08-07 at 00:29 -0300, Milton Cezar Ribeiro wrote:

Dear all,

I have a a mapset on Lambert Azimuthal Equal Area projection,
and I would like to export my raster maps to another projection
(Lat/Long - WSG84 datum). I need to export my maps to
ASC format. Need I to reproject my maps first or can I
change the projection during the export?

By the way, I am running native wingrass 6.3.0 under windows/XP.

Cheers

miltinho astronauta
brazil

|
|
| Type of Map: raster Number of Categories: 65535
|
| Data Type: CELL
|
| Rows: 11882
|
| Columns: 9341
|
| Total Cells: 110989762
|
| Projection: Lambert Azimuthal Equal Area
|
| N: 6443500 S: -5438500 Res: 1000
|
| E: 4985500 W: -4355500 Res: 1000
|
| Range of data: min = 0 max = 65535
|
|
|
| Data Description:
|
| generated by r.in.bin
|
|
_______________________________________________

Hi!

-Using exclusively GRASS modules I think you must (1) reproject in
another location (with r.proj) and (2) export (with r.out.*). Pay
attention to the current region settings (check/set extent and
resolution with g.region).

-Using gdal utilities you might be able to reproject and export in one
step [1]

Kind regards, Nikos

[1]
http://gfoss.blogspot.com/2008/06/gdal-raster-data-tips-and-tricks.html

3

-Using gdal utilities you might be able to reproject and export in one
step [1]

Bom dia, Milton, tudo bom?

I would second Nikos, is the way to go. It can read you GRASS rasters,
export them to the format you need and reproject in one pass.
That may be tricky, but well worth the effort.
--
Paulo Marcondes = PU1/PU2PIX
-22.915 -42.224 = GG86jc

4

Thanks for all suggestions,

Kind regards,

Miltinho
brazil

2008/8/7, Paulo Marcondes <paulomarcondes@gmail.com>:

-Using gdal utilities you might be able to reproject and export in one
step [1]

Bom dia, Milton, tudo bom?

I would second Nikos, is the way to go. It can read you GRASS rasters,
export them to the format you need and reproject in one pass.
That may be tricky, but well worth the effort.

Paulo Marcondes = PU1/PU2PIX
-22.915 -42.224 = GG86jc

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