[GRASS-user] Converting a XYZ positions in WGS84 to UTM29N

GRASS GRASS user
1

Greetings
I have an excel file with XY and point ID and I want to:
1- Create an Shapefile with this points (they were obtaiend with a GPS so it’s WGS84)
2- Reproject to UTM29N
can anyone just give me a few tips of the steps I need to do?
Thanks
Best regards
Kat

2

Greetings
I have an excel file with XY and point ID and I want to:
1- Create an Shapefile with this points (they were obtaiend with a GPS so it’s WGS84)

First make sure in Excel that the Lon/Lat are formatted in decimal degrees (not D-M-S or anything else). Then do Save As… and choose CSV, a comma separated text file.
Now start GRASS in a LOCATION based on EPSG:4326 and run v.in.ascii. be sure to set the fs (field separator) parameter to ‘,’ like in the CSV file.

2- Reproject to UTM29N

Create a new location based on EPSG:32729. In this location run v.proj, pointing to the Lon/Lat location and mapset, and the point vector you imported above.

HTH,
Micha

··· 
-- 
Micha Silver
GIS Consultant, Arava Development Co.
[http://www.surfaces.co.il](http://www.surfaces.co.il)
3

On 27/03/2012 19:41, katrin eggert wrote:

Greetings
I have an excel file with XY and point ID and I want to:
1- Create an Shapefile with this points (they were obtaiend with a GPS
so it's WGS84)
2- Reproject to UTM29N
can anyone just give me a few tips of the steps I need to do?

- Save the Excel file in csv format
- Generate a .vrt file as explained in section "Reading CSV containing spatial information" at [1]
- Use ogr2ogr [2] for converting from vrt/csv to shapefile format

Hermann

[1] http://www.gdal.org/ogr/drv_csv.html
[2] http://www.gdal.org/ogr2ogr.html