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Unmanned Spaceflight.com _ Image Processing Techniques _ Help with an LRO image

Posted by: LivingNDixie Dec 12 2012, 03:15 AM

Is there a way of getting this http://www.nasa.gov/images/content/565706main_wac_tycho_highphase.jpg without the gridlines? I have looked at NASA LRO site, the ASU LRO site and the Planetary Photojournal.

Am I missing something?

Posted by: elakdawalla Dec 12 2012, 05:02 AM

Is that part of the global WAC mosaic? http://wms.lroc.asu.edu/lroc/global_product/100_mpp_global_bw

Edit: no, it's not, I found the original image at the LROC site and I realize it's higher-phase than the global mosaic.

What you need to do is to go here:
http://wms.lroc.asu.edu/lroc

Zoom in to the area around Tycho, then click the "Toggle Layers" button to turn on the WAC layers. Then be patient; it takes a while for the site to retrieve the footprints. Then download data to your heart's content. I haven't messed with WAC data before; I think it's a weird different format from NAC data. I'm not sure if IMG2PNG can convert it or not.

Posted by: mcaplinger Dec 12 2012, 07:02 AM

QUOTE (elakdawalla @ Dec 11 2012, 10:02 PM)

Zoom in to the area around Tycho, then click the "Toggle Layers" button to turn on the WAC layers... Then download data to your heart's content.

As far as I can tell, this gets you to the raw pushframe data, which is going to be a little tricky to work with. It seems only the global WAC mosaic has been archived, not any regionals at different phase angles.

I'd email ASU and ask.

Posted by: Phil Stooke Dec 12 2012, 03:42 PM

You mean like this?

(I can email a less compressed version)

Phil

Posted by: Bjorn Jonsson Dec 12 2012, 11:47 PM

QUOTE (elakdawalla @ Dec 12 2012, 05:02 AM)

[snip]

I haven't messed with WAC data before; I think it's a weird different format from NAC data. I'm not sure if IMG2PNG can convert it or not.

IMG2PNG correctly converts the WAC data into something recognizable but yes, the format is weird and a bit more complicated to convert than most of the other data IMG2PNG can convert.

Posted by: Phil Stooke Dec 13 2012, 02:55 PM

People who are interested in using WAC images might like this site:

http://moonscience.yolasite.com/lroc-wac.php

It contains a gallery of processed WACs, many with spectaular low angle lighting. But in the text at the top of the gallery page, look at the link for a software utility to process the raw data.

Phil

Posted by: LivingNDixie Dec 14 2012, 04:09 PM

QUOTE (Phil Stooke @ Dec 12 2012, 09:42 AM)

You mean like this?

(I can email a less compressed version)

Phil

Phil,
That is exactly what I was looking for. Thanks Again!

Posted by: Phil Stooke Dec 14 2012, 06:54 PM

If anyone is interested, I did not have access to the unannotated image. I just stripped out the grid using Photoshop and a bit of magic.

Phil