I want to create a map legend box that will be rendered in a layer above all the other map layers, using the same shapes mechanism that I'm using for the geographical information. However, I want to render the legend box in the same location in the bounding box, no matter what lat/lon coordinates are being rendered.
It seems that the simplest way would be to have a layer whose coordinate system is in absolute viewport pixels rather than whatever projection the GIS shapes are rendered in (I'm using"+proj=latlong +datum=WGS84" for everything else). Can I change the proj and datum values to image pixel x,y for a single layer, and if so, what are the proj and datum keys? Or is there another way to do this? Eric
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