Comments on: Shaded relief in AS3 http://andywoodruff.com/blog/shaded-relief-in-as3/ Adventures in cartography Tue, 24 Jan 2012 16:36:17 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: kaleo Puaa http://andywoodruff.com/blog/shaded-relief-in-as3/comment-page-1/#comment-97249 kaleo Puaa Sun, 16 Jan 2011 17:56:37 +0000 http://www.cartogrammar.com/blog/?p=784#comment-97249 That grayscale elevation map on section 1) is exactly what I have been needing. I've been trying to find ones of the other islands too but can and when I look up DEMs all I find is one that do the shadowing but I need it with out shadow and just grayscale elevation. Can someone help me find that? That grayscale elevation map on section 1) is exactly what I have been needing. I’ve been trying to find ones of the other islands too but can and when I look up DEMs all I find is one that do the shadowing but I need it with out shadow and just grayscale elevation. Can someone help me find that?

]]> By: Andy Woodruff http://andywoodruff.com/blog/shaded-relief-in-as3/comment-page-1/#comment-42355 Andy Woodruff Sun, 20 Jun 2010 16:23:35 +0000 http://www.cartogrammar.com/blog/?p=784#comment-42355 Wow, how did I not know about that paletteMap method? Thanks! Wow, how did I not know about that paletteMap method? Thanks!

]]> By: Amit Patel http://andywoodruff.com/blog/shaded-relief-in-as3/comment-page-1/#comment-42219 Amit Patel Sun, 20 Jun 2010 01:08:27 +0000 http://www.cartogrammar.com/blog/?p=784#comment-42219 Looks nice! You might find BitmapData.paletteMap() useful for hypsometric tinting. You can define a 256-element array to map the gray values into some other color, and Flash will do the loop and lookup for you. Looks nice! You might find BitmapData.paletteMap() useful for hypsometric tinting. You can define a 256-element array to map the gray values into some other color, and Flash will do the loop and lookup for you.

]]> By: David Medeiros http://andywoodruff.com/blog/shaded-relief-in-as3/comment-page-1/#comment-17962 David Medeiros Thu, 25 Mar 2010 16:48:57 +0000 http://www.cartogrammar.com/blog/?p=784#comment-17962 In addition to Tom's site I would add www.reliefshading.com which has a lot of detail on the theory and methodology behind effective shading. And it's worth mentioning the book "Cartographic Relief Presentation" by Eduard Imhof, the man who made relief shading an academic subject. In addition to Tom’s site I would add http://www.reliefshading.com which has a lot of detail on the theory and methodology behind effective shading. And it’s worth mentioning the book “Cartographic Relief Presentation” by Eduard Imhof, the man who made relief shading an academic subject.

]]> By: Andy Woodruff http://andywoodruff.com/blog/shaded-relief-in-as3/comment-page-1/#comment-17945 Andy Woodruff Thu, 25 Mar 2010 14:05:40 +0000 http://www.cartogrammar.com/blog/?p=784#comment-17945 Ralph: thanks for that tip! I'm sort of aware of those things but don't know much about them. I'll be sure to check it out when possible. Tim: indeed, thank you for pointing that out. Working with this kind of thing in the past in Photoshop, I was always most pleased with just a regular ol' semi-transparent overlay instead of different blending modes, but that's definitely worth mentioning. Different color schemes will probably work best with different blending modes. Ralph: thanks for that tip! I’m sort of aware of those things but don’t know much about them. I’ll be sure to check it out when possible.

Tim: indeed, thank you for pointing that out. Working with this kind of thing in the past in Photoshop, I was always most pleased with just a regular ol’ semi-transparent overlay instead of different blending modes, but that’s definitely worth mentioning. Different color schemes will probably work best with different blending modes.

]]> By: Tim Oxley http://andywoodruff.com/blog/shaded-relief-in-as3/comment-page-1/#comment-17924 Tim Oxley Thu, 25 Mar 2010 11:14:19 +0000 http://www.cartogrammar.com/blog/?p=784#comment-17924 You might want to play around with blending modes for different effects when combining the maps. For example, try applying the relief map over the top with blend mode set to multiply: reliefMap.blendMode = BlendMode.MULTIPLY; :) You might want to play around with blending modes for different effects when combining the maps.

For example, try applying the relief map over the top with blend mode set to multiply:

reliefMap.blendMode = BlendMode.MULTIPLY;

:)

]]> By: Ralph Hauwert http://andywoodruff.com/blog/shaded-relief-in-as3/comment-page-1/#comment-17915 Ralph Hauwert Thu, 25 Mar 2010 09:58:09 +0000 http://www.cartogrammar.com/blog/?p=784#comment-17915 Alternatively, to find the slopes / central difference, you can use a pixelbender filter or a combination of 2 convolution filters (one for x, one for y). This enables you to do this in realtime. Alternatively, to find the slopes / central difference, you can use a pixelbender filter or a combination of 2 convolution filters (one for x, one for y). This enables you to do this in realtime.

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