sarscape for envi

7/23/2019 Sarscape for Envi

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SARscape for ENVI

A Complete SAR Analysis Solution


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IDL and ENVI

A Foundation for SARscape


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Visual Information Solutions

Data Access:

IDL supports virtually every data format,

type and size so you can focus on

interpreting your data

Data Analysis:

IDL includes a rich library of proven math,

statistics, image processing and signalprocessing routines

Data Visualization:

IDL is specifically designed for visualizing

large and complex datasets

IDL The Data Analysis & Visualization Platform


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Array-oriented operations

Built-in signal and image processingroutines

Extensive numerical analysis and

statistics

Wavelet analysis

LAPACK Library

IDL Analyst: IMSL Library

Multi-threaded processing User-defined routines

Data Analysis


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Windows (2000 & XP), Linux, Mac

OS X, HP-UX, AIX, IRIX, Solaris

Extensive Image and Vector Format

Support

Certified NITF Read/Write

Calibration Utilities

FLAASH Atmospheric Correction

(MODTRAN)

Image Enhancement and Statistics

ENVI Product Overview


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Regions of Interest Utilities

Image Transforms and Filtering

Change Detection Analysis

Automatic Image Registration and

Orthorectification

Mosaicking

Map Composition

ENVI Product Overview


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ENVI is a complete image processingand remote sensing software package

Leader in multispectral and

hyperspectral analysis

Intuitive GUI makes ENVI easy to learnand use

ITTs Global Services Group are experts

at using IDL to extend and customize

ENVI

ENVI Summary


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SARscape


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What is SARscape?

A modular set of functions dedicated tothe generation of products derived fromspaceborne Synthetic Aperture Radar

(including JERS-1, ERS-1/2, Radarsat-1, ENVISAT/ASAR and

ALOS/PALSAR)

Developed by sarmap, a Swisscompany

An ENVI plug-in written in C++

Currently comprised of 6 modules, 2base modules and 4 extensions, withmore on the way

Very robust variety of SAR tools thatare complimented by the power ofENVI and IDL

Interferogram

Coherence Image


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SARscape in ENVI

SARscape appears as a main menu item in ENVI with all of the

modules appearing as items under the main SARscape menu


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Current SARscape Modules

Basic

includes a set of processing steps for the generation of SAR-based products

complemented by multi-purpose tools which include a wide range of functions -

from image visualisation, to Digital Elevation Model import and interpolation, tocartographic and geodetic transforms

Focusing

extends focusing capabilities to RADARSAT-1 (Fine Beam and Standard Beam),ENVISAT ASAR (Alternating Polarisation, Image, and Wide Swath), and ALOSPALSAR (Fine Beam, ScanSAR, Polarimetric) data

Gamma & Gaussian Filter Module

an extension of the Basic module

includes a whole family of SAR specific filters

algorithms are based on Gamma/Gaussian-distributed scene models

particularly efficient at reducing speckle, while preserving the radar reflectivity, thetextural properties and the spatial resolution, especially in strongly textured SARimages


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Current SARscape Modules

Interferometry (InSAR/DInSAR)

Interferometric SAR (or 2-pass interferometry, InSAR) and DifferentialInterferometric SAR (or n-pass interferometry, DInSAR) module

dedicated to the generation of Digital Elevation Model, Coherence, and LandDisplacement maps

ScanSAR Interferometry (InSAR/DInSAR)

developed by aresys based on an original algorithm of Politecnico di Bari

(POLIBA) extends the Interferometry module to ScanSAR mode

offers some brand-new low resolution products, such as Coherence,Interferogram, and Land Displacement maps

SAR Polarimetry & Polarimetric Interferometry (PolSAR &PolInSAR)

supports the processing of polarimetric and polarimetric interferometric SARdata


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Upcoming Modules

Persistent Scatterers (PS)

developed in collaboration with ARESYS

enables the identification of mm-scale displacements of individual features(e.g. buildings) on the ground

This module will be released in Q3 2007

Ship/Wave/Oil Spil l Detection

Module scheduled for release in Q4 2007


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SARscape Modules What works with what


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Supported SAR Systems

Current operational systemsCurrent operational systems

ENVISAT

2002RADARSAT-1

1996

ERS-1/2

1991

ALOS

2006


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Supported SAR Systems

Planned for launchPlanned for launch

RADARSAT-2

2007

RISAT

2007

TerraSAR X

2007


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Additional Info:

sarmap will work with a customer to develop toolsnecessary for their particular products

they will modify the source code to add in a new dataformat for a proprietary sensor (this will depend uponhow much info can be given to sarmap about the dataformat and specifics)

They will also entertain the idea of opening up thesource code if some of the parameters cannot beshared so that the customer can do the work in-house(for classified projects)


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Basic Module Examples


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Resource Management

The example shows a change detection

map derived from ERS-2 SAR data

acquired in 1996, 1998 and 1999 in an

area of Sri Lanka.

The map shows three classes: Stable

water bodies (blue), Shrimp farms as

observed on April 18th 1996 (red), and

their expansion as imaged on October

16th 1998 (pink).

Aquaculture MappingAquaculture Mapping


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Rice mapping

Image courtesy of IRRI

Agricultural Planning and Management


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ERS otime series image

ERS-2 desc, 05-May-96

ERS-2 desc, 09-Jun-96

ERS-2 desc, 14-Jul-96


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Rice map using o time series

Single Crop Rice

Double Crop Rice Irrigated

Mixed Double Crop Rice

Double Crop Rice 1

Double Crop Rice 2 Urban areas roads and uncultivated


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Rice map overlaid with GIS data


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Monitoring rice transplanting in the Philippines - Year 2004 Radarsat-1

& ENVISAT ASAR AP data

Mean Amplitude imageASAR HH - 13 November 2003Radarsat - 12 December 2003ASAR - HH - 18 December 2003ASAR - HH - 6 January 2004ASAR - HH - 22 January 2004ASAR - HH - 10 February 2004Radarsat - 22 February 2004ASAR - HH - 16 March 2004Rice Transplanted areas over timeLandsat 5 TM - cloud freearchive image


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Flood extent mapping

Image courtesy of FEMA, USA

Disaster Response


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Flood Mapping in Bangladesh, 2004

Envisat ASAR Wide Swath data Bangladesh

25 July 2004 (R,G) & 23 Mar 2003 (B)28 July 2004 (R,G) & 19 May 2004 (B)


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Flood Mapping in Bangladesh, 2004

GIS representation of the flood extent Bangladesh


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Oil sl ick imaged by ERS-1 SAR

Environmental Applications

Ship captured during aseepage action


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SARscape Applications

DEM

GenerationSARscape

Landslides/

Subsidence

RiceMapping

Forest

Mapping

Land CoverMapping

Flood

Mapping

Agriculture

Oil Slick

Monitoring


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Interferometry Example


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Interferometry Workflow


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From Single Look Complex (SLC) Data to a DEM:

Input: Master and Slave SAR SLC Images Output: DEM


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Baseline Estimation

Estimation of the image-pair baseline parameters


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Interferogram Generation Raw Interferogram

Interferogram_int


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Multi-looked Master and Slave Generation

Looks: 4 azimuth / 1 range

Ground-Resolution:~ 15 x 15 meters

Master_pwr Slave_pwr


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Interferogram Flattening With Ellipsoid

Interferogram_dint


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Extraction of a Reference DEM

GTOPO DEM_dem(resampled to 15 m)


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Adaptive Filter and Coherence Estimation

Interferogram_fint

coherence_cc


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Phase Unwrapping

Interferogram_upha


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Phase Editing


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Baseline Fit

In case topographic mapswere available, GCPvalues (coordinates andheights) must be enteredmanually

In this example (use of areference DEM in slantrange), values areautomatically read


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Baseline Fit

Reflattened Interferogram_dint


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Phase to Map Conversion


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Final DEM

sarscape for envi

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