Thanks for the link.
I also found some Mars "hot spots" but these in the area of the mid-latitude Northern plains.

One of the images lies within Cydonia:

THEMIS Image Data Page for I02834003.
CENTER_LATITUDE = 40.1813
CENTER_LONGITUDE = 349.993
MINIMUM_BRIGHTNESS_TEMPERATURE = 306.029
MAXIMUM_BRIGHTNESS_TEMPERATURE = 322.379
http://themis-data.asu.edu/img/I02834003

It contains a feature that has been claimed to appear as a "smoking
pyramid". This is an area in visible light imaging that has light colored
areas giving the appearance of gas or water vapor release. It would be
interesting to find out if the maximal temperature in the IR image
corresponds to this "smoking pyramid".
Some visible light images of the region:

MOC narrow-angle image E01-01908.
http://barsoom.msss.com/moc_gallery/.../E0101908.html

THEMIS Image Data Page for V02834004.
http://themis-data.asu.edu/img/V02834004.html


Another "hot spot":

THEMIS Image Data Page for I02026005.
CENTER_LATITUDE = 39.1376
CENTER_LONGITUDE = 251.959
MINIMUM_BRIGHTNESS_TEMPERATURE = 302.213
MAXIMUM_BRIGHTNESS_TEMPERATURE = 322.192
http://themis-data.asu.edu/img/I02026005

This happens to lie in Alba Patera, the volcanic region. This image is
much more free of noise making it more likely the measurement is an
accurate one.
Here's a visible light image:

THEMIS Image Data Page for V02026006.
http://themis-data.asu.edu/img/V02026006


The link you gave is good in that you can get an IR image of a specific region by giving the latitude and longitude. However, what I need is a way to find the sites in an IR image where the given max temperatures occur so I can try to make a comparison to geomorphogical features, such vents, fissures, etc.
Anyone know how to do this?


Bob Clark