[gdal-dev] Re: Hillshade + Topographic Map??

[Norman Vine]

On Feb 22, 2012, at 8:42 AM, tim martin wrote:

> Hi Donovan and board
> 
> Yes that Tim Sutton tutorial is very good.
> 
> I also found this one
> 
> http://dirkraffel.com/2011/07/05/best-way-to-merge-color-relief-with-shaded-relief-map/ 
> 
> 
> I ended up following this procedure and it has worked v well. I just setup a loop to use ImageMagik and combine the two images. And then reapplied the georeferencing using gdal_translate + world file. 
> 
> Thanks to all helped, it has made me aware of lots of other options that I may use in the future
> 
> thanks again
> 
> Tim

another option is ossim see

http://trac.osgeo.org/ossim/wiki/ossim-dem

Norman

> 
> On 21 February 2012 19:52, Donovan Cameron <sault.don at gmail.com> wrote:
> Have you reviewed the article from Tim Sutton: "A workflow for creating beautiful relief shaded dems using GDAL"[1]?
> 
> It has some valuable pointers.
> 
> [1]  http://linfiniti.com/2010/12/a-workflow-for-creating-beautiful-relief-shaded-dems-using-gdal/ 
> 
> 
> 
> 
> Donovan
> 
> On Tue, Feb 21, 2012 at 12:29 PM, Joaquim Luis <jluis at ualg.pt> wrote:
> 
> 
> 5) Looked at GMT and I cannot find the options to load two rasters on top of each other.
> 
> Tim,
> 
> You don't load the two grids on top of one-another. Illumination is NOT like transparency. It uses the gradients of the grid, projects it into the direction of light and than change the color in the HSV space (the S(aturation) component) and converts back to RGB
> 
> 
> The links that I sent you have the scripts used to produce the figures. You can also look at this one for a very simple illumination in bw, but the procedure for color illumination is exactly the same.
> 
> http://gmt.soest.hawaii.edu/gmt/html/GMT_Docs.html#x1-1300007.5
> 
> 
> 6) MIRONE - again cannot see how to do this from within the application.
> 
> Well, I can give you a 'click-recipe' if you want, but Mirone won't be able to deal with the such big grids as yours.
> Anyway, here is a step-by-step example
> https://sites.google.com/site/mironehowtos/basic/shade-illuminations
> 
> 
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