ntsa seminar mapping the moon

8/9/2019 NTSA Seminar Mapping the Moon

1/40

Mapping the Moon


2/40

A genda: Landing Site SelectionOverview Web seminar I: Landing Site Selection (today) Web seminar II: Search for Lunar Ice (5/13)

Best data to-date: Clementine

Satellite-based topographic mapping Interpretation of topographic maps Why do we need more lunar maps?

Spatial resolution Lunar Land topography demo

Needle in the Haystack spatial resolution exerciseLunar Orbiter L A SER A ltimeter (LOL A )Landing Site Selection Where should your robot land on the surface of Lunar Land?


3/40

Clementine Image

340-m resolution


4/40

Clementine Discussion

What do the colors represent?


5/40


What do the colors represent?- Specific ranges of elevation.


6/40


Where is the elevation highest?


7/40


Where is the elevation highest?- Red and white areas.


8/40


Where is the elevation lowest?


9/40


Where is the elevation lowest?- Purple areas.


10/40

Can you judge?

Could a 10-m diameter lunar lander fit in the crater marked on the surface?

YES NO


11/40

Can you judge?

Could a 10-m diameter lunar lander fit in the crater marked on the surface?

Yes, because the crater diameter is2220 m.


12/40

Can you judge?

Can you tell if the floor of the crater is smoothenough for your spacecraft to land safely?

YES NO


13/40

Can you judge?

Can you tell if the floor of the crater is smoothenough for your spacecraft to land safely

No, because the spatial resolution is340 m.


14/40

F urther Clementine Questions

Could you securely usethis map to choose alanding site for the lander?

YES NO


15/40


Could you securely use this map to choose alanding site for the lander?

No, because the spatial resolution is340 m.


16/40


What would you need for more confidence inanswering the preceding question?

Please respond to this question using theChat Window.


17/40


What would you need for more confidence inanswering the preceding question?

Better spatial resolution of the map.


18/40

Satellite Mapping

A B C D E

01

23456789


19/40

Measurement vs Reality

Why does the dashed line not look exactly like the solid line?

A B C D E

1816141210

8642

0

RealityMeasurement


20/40

Measurement vs Reality

What could you do to improve the accuracy of the measurement?

A B C D E

1816141210

8642

0

RealityMeasurement


21/40

Lunar Land


22/40

Lunar Land


23/40

Lunar Land slice: 2 data points per second


24/40



25/40



26/40

Needle in the Haystack

If the numbers represent theheight of features on thesurface (blank = 0represents sea level),where is the tallest feature?

What does the landscapelook like in the upper rightcorner?

Would you want to try toland a spacecraft on a tall,

pointy feature?

4 1 1 1 1

1

4 1 1

1 1 1 1 1

2 2

10 2 2

2


27/40

Decrease resolution by a factor of 2

4 1 1 1 1

1

4 1 1

1 1 1 1 1

2 2

10 2 2

2

8 x 8

a b c d

e f g h

j k m n

p q r s

4 x 4


28/40

Decrease resolution by a factor of 2 AGA

IN

4

6

10

3

3

8

2

2

2

4 x 4 2 x 2

a b

c d


29/40

Can you go the other way??

1010

10 10

4 1 1 1 1

1

4 1 1

1 1 1 1 1

2 2

10 2 2

2


30/40

Lunar Orbiter Laser A ltimeter

To fly onboard the Lunar Reconnaissance Orbiter, launch Nov 2008

lunar.gsfc.nasa.gov


31/40

What will LOL A produce?

High resolution 3-D map of the Moon

G eodetic global topography - nearside essential at

ntsa seminar mapping the moon

Documents