[GRASS-user] Re: How to work with the NASA Blue Marble dataset

[Hamish]

Elvis Dowson wrote:
> From what I've learnt there are three types of data, with the one
> with the topography and bathymetry being the nicest looking.
> 
> I think the latest image set is the december next generation one found
> here: Visible Earth: December, Blue Marble Next Generation
> w/ Topography and Bathymetry

well, technically the Dec 2004 image IS the most recent, but the idea of Jan-Dec is to show variation in ice cover and vegetation throughout the year -- not that they gave up after a year of making marbles.

 
> Any tips on how I can get this into grass-6.4.0? Which modules should  
> I use, should I use the r.in.onearth ? What sort of reprojection or
> processing should I do to get this into grass-6.4.0?

I have now added a page in the GRASS wiki to cover this,
  http://grass.osgeo.org/wiki/Blue_Marble

feel free to improve. I've only downloaded the 2002 version + "Earth at
Night" image, so 2004 next-generation info is a bit thin. But I think you can adjust the 2002 method to suit.


I slightly copied the method from this old post:
  http://article.gmane.org/gmane.comp.linux.gps/1437/


If you want global topography + sea floor bathymetry elevations, see the instructions for getting the 1' global dataset:
  http://grass.osgeo.org/wiki/Marine_Science#Bathymetric_data
  http://topex.ucsd.edu/marine_topo/mar_topo.html



enjoy,
Hamish