Maps of Steve Albers

[CAP-Team]

The maps are already available in JPEG and TIFF format, so whose traffic are you trying to cut down?
Nowadays a lot of people have broadband internet connections so downloading big files shouldn't be a problem any more.

[RVS]

The maps are already available in JPEG and TIFF format, so whose traffic are you trying to cut down?

If you answer some post, you could read it more attentively. But I can repeat: by activating ZIP compression of pictures. Currently they (TIFFs) are (mostly) uncompressed TIFFs.

Nowadays a lot of people have broadband internet connections so downloading big files shouldn't be a problem any more.

Is the downloading of maximal possible quality of megabytes, regardlessly of possibilities, your hobby?

[CAP-Team]

If you answer some post, you could read it more attentively. But I can repeat: by activating ZIP compression of pictures. Currently they (TIFFs) are (mostly) uncompressed TIFFs.

Yes I read that correctly. I agree that it would save space, but I don't mind if Steve doesn't compress his maps.

Is the downloading of maximal possible quality of megabytes, regardlessly of possibilities, your hobby?

The amount of megabytes I download is not something that keeps me awake at night

[scalbers]

That might be worth considering as for me the disk space can be a bit of an issue. In IDL where I make my images I can select LZW or "pack bits" compression that I believe should be lossless. Perhaps that would save a modest amount (30-50%) - I'll see if it helps any for my next updates.

And by the way, I've recently updated my maps for Titan and Iapetus. The Iapetus map now incorporates additional hi-res mosaics constructed by Gordan Ugarkovic, including the northern Saturn-shine region, the Voyager mountains, and the terminator area of the outbound portion, all from the September 2007 encounter.

Catch you all later,
'
Steve

[ElChristou]

Nowadays a lot of people have broadband internet connections so downloading big files shouldn't be a problem any more.

4 to 6% of connected people on this planet is a lot of people??

[RVS]

That might be worth considering as for me the disk space can be a bit of an issue. In IDL where I make my images I can select LZW or "pack bits" compression that I believe should be lossless. Perhaps that would save a modest amount (30-50%) - I'll see if it helps any for my next updates.

Different formats (using Irfan View) yeld:

Code: Select all

name            ext   size
-----------------------------------
iapetus         jpg   4,065,307
iapetus         png   33,637,536
iapetusJPEG      tif   11,520,233
iapetusLZW      tif   59,487,044
iapetusNONE      tif   100,696,290
iapetusPackbits  tif   101,398,218
iapetusZIP      tif   44,453,016


Ideally you would convert into PNGs (at a compression level 9) all yours TIFFs and get rid of this format.

[scalbers]

Thought I'd share this "work in progress" version of my Enceladus map. The entire map has been renavigated and 5 images from the August encounter are included to help show the south polar regions at high resolution. Color information has been added from the "Great Southern Lands" mosaic. The map is at http://laps.noaa.gov/albers/sos/sos.html#ENCELADUS. And yes, it works OK now to post this in PNG format.

Here are a few of the items I'm continuing to look at to try and improve the map:

1) adjust the navigation on the "frame 4" image over the south pole from the August encounter as some mismatches are evident

2) adjust image brightnesses to reduce some of the obvious seams

3) extend coverage of the August imagery over Mosul Sulci

4) attempt to reproject some of the other released color mosaics onto a cylindrical projection so I can utilize the color info. This appears to be a non-trivial exercise for some or the mosaics, compared with the "Great Southern Lands".

Hopefully I can post a version with most of these improvements before too long.

Steve