Shuttle Radar Topography Mission (SRTM)and What’s Next

Tom G FarrJet Propulsion Laboratory

California Institute of TechnologyUSA

The 60 meter long deployable mast isderived from Space Station hardware.

Additional C-band and X-bandantennae are located at the end of themast.

Avionics are added for attitude andorbit determination.

The Shuttle Radar Topography Mission (SRTM)

The shaded area was mapped by SRTM.

SRTM acquired data with 225 km swaths for ten days,

imaging all of the Earth’s land surface between 60° N

and 56° S latitude.

The data will be processed into a digital topographic

map. SRTM will also produce a rectified, terrain-

corrected C-band image mosaic of 80% of the Earth’s

land surface at 30 meter resolution and a terrain

classification overlay.

The X-band interferometer is supplied by the German and Italian space agencies.

SRTM Mission Success:Feb 11-22, 2000

BrazilArgentina

Hawaii

Fiji

LA

Real-Time products duringthe mission

99+% coverage of theplanned area

THE SHUTTLE RADAR TOPOGRAPHY MISSION

L a u n c h

E n d e a v o u r ( S T S - 9 9 ) l a u n c h e d

F e b r u a r y 1 1 , 2 0 0 0 , o n a n 1 1 - d a y

f l igh t

R e f l o w n h a r d w a r e : P r i m a r y a n t e n n a & s u p p o r t

s t r u c t u r e , R F e l e c t r o n i c s , c o m m a n d / t e l e m e t r y

sys tem, power d i s t r i bu t i on sys tem, d i g i t a l da ta

s y s t e m , r e c o r d e r s , t a r g e t t r a c k e r , a t t i t u d e g y r o s

N e w h a r d w a r e : M a s t & c a n i s t e r , s e c o n d a r y

a n t e n n a , s t a r t r a c k e r , G P S

2 2 5 k m i n t e r f e r o m e t r i c s w a t h s m a p p e d

a l l l a n d m a s s b e t w e e n ± 6 0 ° l a t i t u d e

D a t a r e c o r d e d o n - b o a r d

~ 8 . 6 T B y t e s C - b a n d

~ 3 . 7 T B y t e s X - b a n d

D a t a r e t u r n e d w i t h

S h u t t l e t o G r o u n d D a t a

Process ing Fac i l i t y

a t J P L

T w o y e a r s

p r o c e s s i n g ,

ve r i f i ca t i on , and

va l i da t ion

D i g i t a l e l e v a t i o n d a t a a n d i m a g e s

D e l i v e r e d i n m o s a i c k e d b l o c k s

N I M A p r o d u c t g e n e r a t i o n a n d d i s t r i b u t i o n

t o D e p a r t m e n t o f D e f e n s e u s e r s

U S G e o l o g i c a l S u r v e y

E R O S D a t a C e n t e r

C i v i l i a n a r c h i v e a n d

d is t r ibu t ion

The Shuttle Radar Topography Mission (SRTM) flew on Endeavour Feb11, 2000 for 11 days with objective ofgenerating three-dimensional maps of 80% of Earth's landmass.

SRTM was 100% successful, yielding 12 terabytes of raw data and completely covering the Earth from tip ofSouth America to Greenland.

The completed data set will contain more than 180 billion individual elevation measurements, with resolutionexceeding best existing global maps by two orders of magnitude.

SRTM Views California

San Andreas Fault

Garlock FaultLarge scale perspectivecan lead to newunderstanding of theforces shaping the Earth

Pacific OceanLA

SRTM Measures theUps and Downs of JPL

Pre-production Calibration Activities

• Corner Reflector Arrays andShort Ocean Data Takes– Absolute and relat ive channel

delays

– Timing constants

– Roll constants

• Long Ocean Data Takes– Systematic t rends

– Radar state changes

CA

Oz

ShortLong

Shuttle Motion Compensation: Ocean Data

250 km

250 km

250 km

250 km

175 m

50 m

15 m

5 m

April 2000

June 2000

July 2000

August 2000

Pre-production Sample Data Sets• NIMA Sites

• PI Science Sites– Funded NASA PI

• Large Scale DEMMosaic– Much o f Western US,

but complete ascending/descending coverageonly in California

– Accuracy approachingfinal product accuracy

• NIMA Sites

• PI Science Sites– Funded NASA PI

• Large Scale DEMMosaic– Much o f Western US,

but complete ascending/descending coverageonly in California

– Accuracy approachingfinal product accuracy

Pre-production Sample Data Sets