Envisat AATSR 2 weeks June 2003

Web Mapping Access to theMUIS Browse Products

Lars Edgardh SpacemetricTorbjörn Westin Spacemetric

www.spacemetric.com

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MUIS2WMS project

MUIS-C

InterfaceServlets

WMS ImageServer

• ESRIN specification

• Spacemetric contractor

• SaabTech subcontractor

• Delivered March 2004 on time and on budget

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Spacemetric• Systems for geographical information in

operational context

• Consulting in satellite photogrammetry and image production

• Proven project methods. Long experience of running complex projects

• Web-based technologies such as Java, XML, HTML and JSP

Located in Stockholm Sweden

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Requirements

• Statement of work very clear

• Should provide high accuracy in the rectified and mosaiced images

• Very short response times

• Support of all MUIS-C (MUIS-B) satellites and sensors (14 sensors), both optical and radar

• Based on open source

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Our approach• Reuse modules and experience of designing

systems for orthorectification

• Use same type of analytical model as full images

• Accuracy and stability by using analytical models

• Try new technology for fast massive parallel image processing – Application servers

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WMS Image ServerThe WMS Image Server makes rectification and mosaicing of browses on the fly. The server is a middleware between client and MUIS-C catalogue.

WMS Image Server makes full ortho rectification of browses with sub-pixel accuracy.

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Integration of image data

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WMS query examplehttp://mapmuis.esrin.esa.int:8080/wmsserver/wms?VERSION=1.1.1&REQUEST=GetMap&SRS=EPSG%3A4326&BBOX=7.633748612764467,48.01466301256679,8.212532999103882,57.91858901998451&WIDTH=560&HEIGHT=350&LAYERS=ENV_ASAR_WS_SL,ENV_AATSR_SL&STYLES=,&FORMAT=image%2Fpng&BGCOLOR=0xFFFFFF&TRANSPARENT=TRUE

http://mapmuis.esrin.esa.int:8080/wmsserver/wms?VERSION=1.1.1

&REQUEST=GetMap

&SRS=EPSG:4326

&BBOX=7.633748612764467,48.01466301256679,...

&WIDTH=560

&HEIGHT=350

&LAYERS=ENV_ASAR_WS_SL,ENV_AATSR_SL

&STYLES=,

&FORMAT=image%2Fpng

&BGCOLOR=0xFFFFFF

&TRANSPARENT=TRUE

ERS SARERS ATSR-1ERS ATSR-2JERS OPSLandsat TMLandsat MSSNOAA AVHRR

IRS-P3 MOSCHRIS PROBASeaStar SEAWIFSTERRA MODISENVISAT ASARENVISAT AATSRENVISAT MERIS

Missions and sensors

Requirements on geometric accuracy

Max 1 pixel error

Rigoruos photogrammetric model

Generic sensor models

● Sweep scanner● Conical scanner● Pushbroom scanner● SAR

Preprocessing levels

● Raw swath images● Ground-range preprocessed images

Analytical model Polynomial model

Raw browse

● EPSG:4326 Plate Carrée● AUTO:42001 Auto UTM● AUTO:42002 Auto Transverse Mercator● AUTO:42003 Auto Orthographic● AUTO:42004 Auto Equirectangular● EPSG:* Full EPSG compatibility -> more than 2500

predefined coordinate reference systems

Map projections

Plate Carrée

UTM

Orthographic

Orthorectification using a global DEM

The GLOBE DEM has 1 km resolution

Ellipsoid projected Orthorectified

Original radiometry Automatic linear rescaling

Image enhancement

Removal of decorative frames

Configurable for different missions and time periods

Thresholding black areas

Removes columns and rows based on theshold of column and row average intensities

MRPPLL

JPEG

PNG supports transparency

GeoTIFF stores all map information in tags forautomatic georeferencing in GIS systems

Image file formats