Dealing with artifacts in Wilbur

[acrosome]

Wow, that was fast. Here's the link to download that TIFF I just ordered:

Planetary Data System - Map-a-Planet

Warning: it is 54.1MB, and the link is only good through May 4th. But it looks like it preserves the elevation data that was lost on my last attempt- no plateaus on all the higher mountaintops. Still has the streaks, though. I'll look at it in Wilbur when I get home.

EDIT--- Huh. Wilbur doesn't read TIFFs. I have to convert it into a PNG, and I do that in GIMP, which can only handle 8 bits, so I lose some data anyway. The contours look very pixelated. I'll start hand-correcting what I have, unless Redrobes manages to produce a miracle for me...

[acrosome]

For anyone who cares- it is a heck of a lot easier to patch blank spots in the data with the clone tool in GIMP than in Wilbur. Once I get this done I'll work on the streaks, which I suspect will be the opposite- easier to manipulate in Wilbur.

Say, what's the difference between simple cylindrical and equirectangular cylindrical? My google-fu is failing me. Near as I can tell they are the same, but my simpe cylindrical images seem to lack the poles. I'm not sure if this is a characteristic of the projection or if the data is simply missing. I've certainly seen maps made using the same data that don't have such large holes, but they may have filled some in with Venera or Pioneer data or something.

[Redrobes]

Before I do anything I can I check the link. Did you order it using something like this:

Map-a-planet

and get the email link through for download ?

[acrosome]

Yes, that's the website I ordered it from. They then send you a link for download. (But the link I posted above to download the file has expired- we'd have to order a new one.)

Alternately, what's a decent filesharing schema and I'll post it- though I've never done that before. Or I could email it to you. (If you trust me.)

I've been working on patching the blank spots in the data, and I played with the contrast and brightness so that the map uses the full 255 grayscale colors. It's starting to look useable. I still haven't started working on the streaks, though. If you can easily correct them then you're a better man than I. I'll probably start fiddling with them by hand next.

On that note, in Wilbur is there a way to select a region and drop it by a defined amount? For instance, so that every point has it's altitude is lowered by X?