The SPIRIT Project Goals and Achievements
April 28th, 2010
Marc BERNARD Spot Image
INTRODUCTION SPIRIT by CNES, LEGOS, IGN, Spot Image: a project to serve IPY
2 © Spot Image 2006
SPIRIT : linked with 2007-2009 IPY… and the next one ! SPIRIT main goals were:
To fund the collection of a very large (more than 2.5 millions km²) SPOT 5 HRS stereoscopic archive on polar areas for immediate and future use by scientists
To give the opportunity to the Scientific Community to browse this archive and to obtain for free large amounts of DTMs and orthoimages over the polar areas
Under CNES approval, scientific projects linked with IPY could freely access HRS SPIRIT products on the selected areas
To build a dedicated interface to better serve IPY projects needs : Polar DALI
3 © Spot Image 2006
SPIRIT : 100% customised and 100% unique
Linked with IPY : started in June 2007, ended in March 2009
Funded by the Centre National d’Etudes Spatiales (CNES, France) w. Spot Image participation
Source data : SPOT 5 stereopairs (HRS sensor)
SPIRIT : a 100% customised procedure for SPOT 5 satellite tasking & validation ; full time staff
SPIRIT : a 3D product specifically designed for a specific audience : glaciologist community
SPIRIT : specific target areas selected by LEGOS
SPIRIT : a unique production chain developped and tuned on purpose by IGN (French Mapping Agy.)
SPIRIT : a specific website to browse the progress of HRS coverage and SPIRIT product
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HRG & HRS onboard SPOT 5
Two HRG sensors Across-track orientable 10 m XS 5 m & 2.5 m Panchro Independant sensors 2 x 60 km swath
HRS
HRGs collect monoscopic images Along track Stereoscopy 10 m x 5 m pixel size Fixed coupled telescopes 120 km swath HRS collects stereopairs 5 © Spot Image 2006
HRS acquisition process T0 T0 + 90 s
eo
max . 600
km
12 0k m
Ster
The same pixel row is acquired twice from the same orbit, after 90 s
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SPIRIT Arctic AOIs selected by LEGOS
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SPIRIT Antarctic AOIs selected by LEGOS
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Arctic cloud-free SPOT 5 HRS stereo collection after 2 years : 0.56 M km² (0.78 M targetted)
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Antarctic cloud-free SPOT 5 HRS stereo collection after 2 years : 2.1 M km² (2.6 M targetted)
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Résumé de la prog. / Lessons from the collection campaigns
Archive conséquente : 78% des zones définies ont été acquises / Good overall achievement : 78% of AOIs covered
Zones arctiques plus difficiles à acquérir / Arctic areas harder to collect without clouds (vs Antarctic)
Taux de foisonnement important / Impressive global acquisition ratio
9 pour les zones Arctiques / 9 times for Arctic AOIs 5 pour les zones Antarctiques / 5 times for Antarctic AOIs
Causes de rejet / Rejection causes
Conditions météo / weather Capacité enregistreur / saturation of on-board recorder
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The SPIRIT product: 2 DTM, 2 quality masks, 1 orthoimage
DTM #1
5m Panchro Ortho Image
Quality Mask #1
DTM #2
Quality Mask #2
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The SPIRIT product
Description
DTM Characteristics
Resolution / Projection: 40 m / UTM or stereographic or geographical, to be defined by the user DTM “no hole”: the non correlated pixels are interpolated DIMAP Geotiff format Absolute horizontal precision: 30 m RMS (as evaluated by IGN/CNES in 2006 and earlier) No ground control point used ; no DTM edition
Mask Specificities
2 DTMs, from 2 different sets of correlation parameters 2 correlation masks 1 HRS orthoimage SPIRIT Product is derived from a single HRS stereopair and over areas up to 15,000 km²
Raster masks, showing correlation score (from 0 to 100 %) Interpolated pixels reported with 0 % score Point-to-point superimposable with the corresponding DTM Geotiff format, same projection as DTM
HRS Orthoimage
Orthoimage computed from one of the HRS images, calculated with one of the DTMs ; approx. 5 m resolution Geotiff format Absolute horizontal precision: 30 m RMS (as evaluated by IGN/CNES in 2006 and earlier) 13
© Spot Image 2006
1.36 M km² of SPIRIT Products were extracted over Arctic
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1.30 M km² of SPIRIT Products were extracted over Antarctic
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All existing HRS stereopairs and SPIRIT Products are browsable through a specific web interface (incl. downloadable KMZ) : POLAR DALI http://polardali.spotimage.fr:8092/IPY/dalisearch.aspx The POLAR DALI web site also contains all relevant information for labs.
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Dissemination of SPIRIT Products
only asked for a login 17 © Spot Image 2006
Hielo Norte, Patagonia
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Time for a dramatic 3D flight over the Antarctic Peninsula, computed from a SPIRIT product by ORION DATA (Chile)
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Erebus Mountain , Antarctic
IPY ended in early 2009 So did the funding from CNES No other patron was found But we could not resolve to stop…
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After IPY, Spot Image decided to remain collecting stereopairs over selected AOIs building an historical stereo archive, for future use by labs.
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After IPY, Spot Image decided to remain collecting stereopairs over selected AOIs building an historical stereo archive, for future use by labs.
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Which future for SPIRIT ? Finally the CNES decided in 2010 To integrate SPIRIT Products Into a specific programme Providing data to scientific labs At extra-minimum fees.
Barnard Glacier, Alaska
This magic wand is named ISIS. Aimed at European research labs ISIS alas does not allow The full continuation of SPIRIT But will maintain the know-how Until a new benefactor ariseth Let’s hope, it could be tomorrow !
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Thank you !
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[email protected]
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Bilan Final SPIRIT Année Polaire Internationale – 29 Juin 2009
