Download - NRSC RISAT-1 Data Availability
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RISAT-1 Data availability&
screening of Images
A. V. Ramani
OM, (NDC) – RISAT-1
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Orbit for MRS mode (223 km swath)
Repeat cycle : 377 orbits in 25 days
Altitude : 536.38 km
Inclination : 97.554 deg
Path-to-path distance : 106.3 km
Inner cycle : 12 days
MISSION ORBITMISSION ORBIT
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RISAT-SAR
C-BAND
SYSTEM
5.35 GHz
SINGLE/DUAL/QUAD/CIRCULAR
POLARIZATION
MULTIMODE
SYSTEM
INCIDENT ANGLE
INDEPENDENT OFSWATH
SALIENT FEATURES OF RISATSALIENT FEATURES OF RISAT--11
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P/L MODES(linear)P/L MODES(linear) SwathSwath ReslnReslnCoarse Resolution (CRS)Coarse Resolution (CRS)
12 beams12 beams
223 km223 km 50 m50 m
Medium Resolution (MRS)Medium Resolution (MRS)
6 beams6 beams
115 km115 km 25 m25 m
Fine Resolution (FRS1) singleFine Resolution (FRS1) single
beambeam
25 km25 km 3m3m
Fine Resolution (FRS2) singleFine Resolution (FRS2) singlebeambeam
25 km25 km 9m9m
High Resolution (HRS)High Resolution (HRS)
one beamone beam
10 x10km10 x10km
10X100 km10X100 km
1m1m
PAYLOAD MODESPAYLOAD MODES
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PAYLOAD MODESPAYLOAD MODES
P/L MODES (Circular)P/L MODES (Circular) SwathSwath ReslnResln
Coarse Resolution (CCRS)Coarse Resolution (CCRS) 223 km223 km 50 m50 m
Medium Resolution (CMRS)Medium Resolution (CMRS) 115km115km 25 m25 m
Fine Resolution (CFRS1)Fine Resolution (CFRS1) 25 km25 km 3m3m
Fine Resolution (CFRS2)Fine Resolution (CFRS2) 25 km25 km 9m9m
High Resolution (CHRS)High Resolution (CHRS) 10 x10km10 x10km
10X100 km10X100 km
1m1m
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Non Imagable area
Left Looking
Right Looking
RISAT 1RISAT 1-- DESENDING TRACEDESENDING TRACE
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RISAT 1RISAT 1-- ASCENDING TRACEASCENDING TRACE
Non Imagable area
Left Looking
Right Looking
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POLARIZATIONPOLARIZATION
Coarse Resolution CRS H H, V, HH+HV
CRS V V,H,VV+VH
CCRS Circular Dual
Medium Resolution MRS H H, V, HH+HV
MRS V V,H,VV+VH
CMRS Circular Dual
Modes Transmit
Polarization
Receive
polarization
Fine Resolution - 1 FRS 1 H H, V, HH+HV
FRS 1 V V,H,VV+VH
CFRS 1 Circular Dual
*Fine Resolution - 2 FRS 2 Circular Dual
*Product is under evaluation
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User OrUser Order data ProcessingUser Order data Processing SSystemystem
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Online browse facility :
Browse is available from 01 Jul 2012 and the search is based on the
meta information
User Can place order for fresh collection / Archival data
The following inputs are required to supply/Collect the data
Area of Interest• Point
• Polygon
• Map sheet
• Location
• Shape filePeriod of Interest
• Start date & End Date
or
Specific date
Request for data collectionRequest for data collection
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User Order data ProcessingUser Order data Processing SSystemystem
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1. Look Direction
• left
• Right
• Any
2. Node
• Ascending
•Descending
• Any
Request for data collectionRequest for data collection
3.Resolution
• High
FRS1
FRS1
HRS• Medium
MRS
• Coarse
CRS
4.Tx Polarization
• H• V
• Circular
• Quad
• Any
5.Rx Polarization• H
• V
• Dual
• Any
6. Min Incidence angle ( 12°)
7. Max incidence angle (55°)
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User Order data ProcessingUser Order data Processing SSystemystem
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•Correction Level• Level 0 - Raw - FRS-1,MRS&CRS
• Level1 - Slant range Geo-tagged products FRS-1, MRS.
Ground range Products - FRS 1,MRS&CRS
•Level 2 -Terrain Corrected Geo Coded Products - FRS-1,MRS&CRS
• Projection : UTM/Polyconic (Level 2)
• Sampling : CC (Level 2)
• Format : CEOS ( For all)/GeoTiff ( Level 2)
• Media : DVD/DISK• Dispatch : Courier/FTP
• Priority : Normal /Urgent
• Datum : WGS 84 (Level 2)
Product SpecificationsProduct Specifications
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User Order data ProcessingUser Order data Processing SSystemystem
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Parameter RISAT -1
Geo location accuracy (RMSE) 750 m* (For plain areas)
Geometric
distortion
FRS1 - 100 m
MRS - 150m
CRS - 300m
Radiometric Resolution (SLC) 3.1 dB
PSLR -17 dB
Product AccuraciesProduct Accuracies
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Types of RequestsTypes of Requests
•Standing request
MRS modeDescending
Left look
Transmit H & Receive Dual Pol
Fixed beam ( 87- 97)
• Mission requirements
• Calibration sites
• Specific operations
• User Requirements
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PLAN FOR DATA COLLECTIONPLAN FOR DATA COLLECTION
Based on the user requests received and satellite capacities thefollowing plan is arrived at
Any emergency request is top priority
1. Priority 1 : Default collections with MRS- DEC LEFT LOOKING
with fixed beam ( 87-97)2. Priority 2: Calibration sites . ( Global +Indian)
3. Priority 3: User requests for any mode any node.
4. Priority 4. Default collections in MRS ACS – RIGHT LOOKING
with fixed beam ( 87-97)
5. Priority 5: Collection of data in all polarization combinations foranalysis.
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Availability Of MRS Nominal coverageAvailability Of MRS Nominal coverage
* 6 cycles of MRS is completed
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Availability Of MRS Nominal coverageAvailability Of MRS Nominal coverage
• All MRS strips are recorded and dumped in the next available orbit.
• Due to emergency request or non availability of dump orbit some strips
may get cancelled.
Gaps
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Sample Images
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