nrsc risat-1 data availability

8/20/2019 NRSC RISAT-1 Data Availability

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RISAT-1 Data availability&

screening of Images

A. V. Ramani

OM, (NDC) – RISAT-1



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

2



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

3



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

5



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

6



Non Imagable area

Left Looking

Right Looking

RISAT 1RISAT 1-- DESENDING TRACEDESENDING TRACE



RISAT 1RISAT 1-- ASCENDING TRACEASCENDING TRACE

Non Imagable area

Left Looking

Right Looking



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



User OrUser Order data ProcessingUser Order data Processing SSystemystem



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



User Order data ProcessingUser Order data Processing SSystemystem



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°)



•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



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



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



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.



Availability Of MRS Nominal coverageAvailability Of MRS Nominal coverage

* 6 cycles of MRS is completed



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



Sample Images



Thank You

nrsc risat-1 data availability

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