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

[tim martin]

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

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<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<https://sites.google.com/site/mironehowtos/basic/shade-illuminations>
>>
>>
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>>
>
>
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