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Re: Image Warp Success? [message #69796 is a reply to message #69759]

Thu, 11 February 2010 20:43

pfp
Messages: 12
Registered: July 2009

Junior Member

On Feb 10, 3:22 pm, David Fanning <n...@dfanning.com> wrote:
> If you are warping Image from one map projection to
> another (that is, if you provide a value for the
> IMAGE_STRUCTURE keyword), then Range is a four-element
> array specifying the Cartesian (UV) range. In this case,
> Range must be provided and has the format
> [Umin, Vmin, Umax, Vmax].

This may be related to a question I had this week: how can I use plot
with locations expressed in latitude and longitude, if map_set was not
used? From what I could find out, it seems that plot only uses !map to
know the projection. What I wanted to do was plot lines on a Catalyst
drawwidget that used a mapcoord to set the projection (to warp a
background image).

The way I found to do it was to get the map structure from the
mapcoord object, and give it map_proj_forward, to convert lat/lon to
UV coordinates. Then I plot on top of the image, setting the plot
range to the values in the uv_box field of the map structure. This
seems to give the right result, but I am unsure that this is the most
proper way to do it, particularly because I am not yet very familiar
with how the Catalyst draw, image and coordinate objects interact.

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[Message index]

		Image Warp Success? By: David Fanning on Mon, 08 February 2010 12:30
		Re: Image Warp Success? By: penteado on Fri, 12 February 2010 03:21
		Re: Image Warp Success? By: David Fanning on Thu, 11 February 2010 21:52
		Re: Image Warp Success? By: pfp on Thu, 11 February 2010 20:43

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