How do I rescale a map picture so the axes are lat and lon

I have a satallite picture of an area and when I look at it in matlab the axis are set as the pixel numbers. Instead I want the axes to show the lat and lon coordinates. I know the exact lat lon coordinates of two points in the image and using ginput I also know their pixel coords. Is there a way to tell matlab what their lat lon coords are and have it redo the axes based on that information?

Answer 1

[dpb]

Presuming the two points are not on EW or NS line and have sufficient resolution, you can solve for the linear conversion of pixel position to lat/lon as linear equation for lat and lon independently.(*)

If you leave the plot in pixels then to display the lat/lon will require writing values to the ticklabel property for each axis which will not update with zoom, etc.

I don't have it and have never used it, but I would presume the Mapping TB would have such features built in that would have to "roll your own" with just the basic image routines in base product.

(*) Of course, you've got to go through some machinations for lat/lon or use a linear scale since normal degrees/minutes/seconds isn't directly usable in that manner. There are routines for the purpose I see in the Mapping TB as presumed must be {long/lat}itudeToIntrinsic{X/Y} but there's nothing specific for either in the base ML product according to lookfor