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Posts tagged Mosaics

SAR-Sharpened MOSAIC of Italy

41.8N 12.4E

August 26th, 2009 Category: Image of the day, Mosaics


SAR-Sharpened Mosaic of Italy

SAR-sharpening of Sardinia

SAR-sharpening of Sardinia

The main image here was realized by merging ASAR and MERIS orthorectified Mosaics of Italy, generated by Chelys MOSRI, using a technique we call “SAR-Sharpening” due to its similarity to a method known as PAN-Sharpening.

PAN-Sharpening merges high resolution panchromatic and lower resolution multispectral imagery to create a single high resolution color image. “SAR-Sharpening”, on the other hand, uses a radar image instead of a panchromatic one.

In this image, we maintained the resolution of the MERIS sensor (250m) while greatly enhancing the level of detail using an ASAR mosaic with a 75m resolution.

The animated imagery focusing on Sardinia shows the improvements made through the SAR-Sharpening technique. Due to its resolution, the original color MERIS image clearly has a level of detail inferior to that of the ASAR image.

However, after the processing, the contours of the Italian terrain can be seen in great detail.

ENVISAT Sensor Coverage

ENVISAT Sensor Coverage

ASAR operates simultaneously with the other ENVISAT instruments. The image on the left shows the swath positioning of ASAR along with those of the other sensors.

Chelys is currently exploring the possibility of enhancing the capabilities of their SRRS (Satellite Rapid Response System) processors, enabling them to automatically generate SAR-Sharpened images for all zones in which ASAR and MERIS images overlap.

Updated ASAR Image Mode Medium Resolution Mosaic of Italy

41.8N 12.4E

August 25th, 2009 Category: Mosaics

ASAR Image Mode Medium Resolution Mosaic of Italy

ASAR IMM Mosaic of Italy (Draft Version)

ASAR Image Mode Medium Resolution Mosaic of Italy

ASAR IMM Mosaic of Italy (Final Version)

This image of Italy is an ASAR Image Mode Medium Resolution Mosaic created with products acquired between January and July 2009.

These source images were generated starting from ENVISAT/Asar products, using the Chelys Satellite Rapid Response System.

They were then projected, orthorectified (with a NASA Digital Elevation Model of 3 arcseconds of resolution) and merged in this mosaic by Chelys MOSRI, a real time mosaic generation system, at the original resolution of 75 meters (0.000833 degrees per pixel).

The entire mosaic was generated in less than 1 minute. This is the latest version of the ASAR processing algorithm used by MOSRI which eliminates the banding effect created by merging the various original images.

3-day Composite Image – October 7th to 9th, 2008

October 14th, 2008 Category: Snapshots

Mosaic showing movement of Norbert and Odile - October 7th to 9th, 2008

Mosaic showing movement of Norbert and Odile - October 7th to 9th, 2008

This is a composite image from MOSRI, a service for generating Mosaics in real time, showing the meteorological changes over part of the globe between October 7th and October 9th, 2008. Of particular interest are the movements of Hurricane Norbert and Tropical Storm Odile (16E).

The mosaics generated by the MOSRI system are of two essential types: mosaics at medium or high resolution without cloud cover mosaics at medium or high resolution with cloud cover. The image on the right is a medium resolution image with cloud cover, shown in 3 dimensions with Google Earth.

MOSRI, a Real Time Mosaic generation system

August 28th, 2008 Category: Earth Observation, Mosaics

MOSRI Mosaic - First Half 2008 - Meris Medium Resolution

MOSRI Mosaic - First Half 2008 - Meris Medium Resolution

The importance of satellite data is becoming greater every day thanks to technological progress that has made technology which once could only be obtained through the use of supercomputers, available to the general public.

Today, public networks (Internet) allow us to transmit huge amounts of data in a way that permits the distribution of satellite images which, due to their dimensions, could only be distributed on physical media (DVD, Tapes, etc.) until a few years ago. At present, new 3D visualization tools (Google Earthâ„¢, NASA WorldWind, etc.) allow us to depict information with a completely new appearance and to interact with it in a more intuitive way. All this, in addition to an increased sense of global awareness, has increased interest in images of our planet as seen from space.

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2nd Meris/(A)ATSR User Workshop

August 3rd, 2008 Category: Earth Observation, Events

2nd Meris/(A)ATSR User WorkshopThe European Space Agency is organising its second joint MERIS and (A)ATSR workshop, which will be hosted at ESA ESRIN in Frascati, Italy from 22 to 26 September 2008.

Chelys will attend the event presenting the work done in the field of the satellite image processing: MOSRI, a Real Time Mosaics generation system.