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patrick
2004-Nov-26, 03:29 PM
Hi,
looking at the THEMIS images page, I was wondering why the South Pole region seems to be covered 'inch by inch', while the North Pole hardly.
Also it is notable that images seem to focus more on the southern hemisphere.

What makes the South- pole & hemisphere apparently more interesting?

http://www.flextennis.com/test/marsmap.jpg

01101001
2004-Nov-26, 06:21 PM
looking at the THEMIS images page, I was wondering why the South Pole region seems to be covered 'inch by inch', while the North Pole hardly.

Don't you mean for "just the /04/01/04 data release (http://themis-data.asu.edu/mars-bin/mars_cgi_map.pl?TOP_LAT=90&LEFT_LON=180&CENT_LAT=0 &CENT_LON=0&DISP_RES=2&DISP_DATASET=Vis+%26+IR&DIS P_MAP_DATASET=1&DISP_MAP_PROJ=0&DISP_GROUND_TRACKS =2&DISP_OBS_AGE=0&TNAIL_LINK=empty&PAN_SELECT_ZOOM =ZOOM&OBS_AGE=04%2F01%2F04)"?

The 10/01/03 data release (http://themis-data.asu.edu/mars-bin/mars_cgi_map.pl?TOP_LAT=90&LEFT_LON=180&CENT_LAT=0 &CENT_LON=0&DISP_RES=2&DISP_DATASET=Visible&DISP_M AP_DATASET=1&DISP_MAP_PROJ=0&DISP_GROUND_TRACKS=2& DISP_OBS_AGE=5&TNAIL_LINK=empty&PAN_SELECT_ZOOM=ZO OM&NEW_DATASET=Vis+%26+IR) shows a bias toward the north.

When you look at all the data releases (http://themis-data.asu.edu/mars-bin/mars_cgi_map.pl?TOP_LAT=90&LEFT_LON=180&CENT_LAT=0 &CENT_LON=0&DISP_RES=2&DISP_DATASET=Vis+%26+IR&DIS P_MAP_DATASET=1&DISP_MAP_PROJ=0&DISP_GROUND_TRACKS =2&DISP_OBS_AGE=9&TNAIL_LINK=empty&PAN_SELECT_ZOOM =ZOOM&OBS_AGE=All), coverage seems more balanced, though still skewed somewhat to the south.

It is a projection map, though, so a small area of coverage at low latitudes only looks like a lot of area -- just as Antarctica looks huge on most Mercator projections of Earth. The south-pole coverage is probably no more intense than the half-dozen other areas of thorough observation they have made, scattered around Mars.

Why south-pole and not north? The blue is visible-light scans. Maybe something about the clounds or ice of the north pole made the south more profitable to view for a time. I'm not familiar with the circumstances.

Bamf
2004-Nov-27, 03:01 AM
Hi,
looking at the THEMIS images page, I was wondering why the South Pole region seems to be covered 'inch by inch', while the North Pole hardly.
Also it is notable that images seem to focus more on the southern hemisphere.

What makes the South- pole & hemisphere apparently more interesting?

Both poles are being mapped, but 12 months ago the north pole was in total darkness (northern winter), so very few images were being taken of it, and the south pole got lots of coverage. Recently, the south pole was in total darkness, and the north pole has been getting all the coverage. The sun is headed south again, so between March and May, the south pole mapping will ramp up again.

At least one of my mosaics (http://themis.asu.edu/zoom-20031210A.html) of the polar mapping campaign has made it to the web.

RGClark
2004-Nov-27, 06:19 PM
Hi,
looking at the THEMIS images page, I was wondering why the South Pole region seems to be covered 'inch by inch', while the North Pole hardly.
Also it is notable that images seem to focus more on the southern hemisphere.

What makes the South- pole & hemisphere apparently more interesting?

Both poles are being mapped, but 12 months ago the north pole was in total darkness (northern winter), so very few images were being taken of it, and the south pole got lots of coverage. Recently, the south pole was in total darkness, and the north pole has been getting all the coverage. The sun is headed south again, so between March and May, the south pole mapping will ramp up again.

At least one of my mosaics (http://themis.asu.edu/zoom-20031210A.html) of the polar mapping campaign has made it to the web.

Wow. That's a gorgeous image thanks.


Bob Clark

AlexBlackwell
2004-Dec-01, 11:16 PM
At least one of my mosaics (http://themis.asu.edu/zoom-20031210A.html) of the polar mapping campaign has made it to the web.
Nice work, Noel. I remember seeing this when it was first posted on the web.

Bamf
2004-Dec-02, 11:45 PM
At least one of my mosaics (http://themis.asu.edu/zoom-20031210A.html) of the polar mapping campaign has made it to the web.
Nice work, Noel. I remember seeing this when it was first posted on the web.
Thanks. I've got about 100 more just like that. For various reasons they
just haven't made it to anyplace public yet.