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What is EOSnap ?

EOSnap is a web portal dedicated to Earth Observation. Luca’s words can best summarize why the site was created:

We have been working in the field of earth observation for over 13 years. Even after all this time, I am continually surprised by how beautiful and varied our planet is. Every day, we generate photorealistic images from satellite data. I am lucky that this work puts me in the privileged position of observing the planet in great detail. EOSnap is meant to be a small window on our planet that allows all people to appreciate the Earth’s beauty and also, hopefully, a way of increasing public awareness on environmental issues so that such beauty can be preserved for future generations.

Luca Mellano (Founder and CEO of Chelys)
May 13th, 2008

Chelys srl

Chelys was established in 2002 and its core business focuses on software development and supplying services in the Earth Observation sector as a provider of processing stations for Earth observation satellites.

In the beginning our personnel worked on the development, integration and maintenance of the ESA/Envisat PDS (payload data segment) on behalf of Thales Alenia Space, and then on the development of test tools and integration of the Eumetsat/EPS GS (ground segment).

These experiences allowed us to become specialized in satellite data management and to concentrate on real time satellite (raw) data processing, data quality control, image generation, projection and mosaics (composite satellite images).

Our main product, Satellite Rapid Response System, a multimission real-time data processing and quality control system that is able to simultaneously process data coming from several different missions. It can be used to process data from the following satellite instruments:

  • ALOS - AVNIR-2 level 0 (raw data) and level 1
  • ENVISAT - ASAR level 0 (raw data) and level1
  • ENVISAT - MERIS levels 0 (raw data), level1 and level2
  • ENVISAT - MERIS levels 0 and level1 FAPAR/MGVI Processor for Monitoring Vegetation Cover
  • METOPAVHRR3 level1b
  • TERRA and AQUA - MODIS level1b
  • SUOMI-NPPVIIRS level1b

The SRRS system used by ESA, MIRAVI, has been installed in all Envisat satellite acquisition stations and has been delivering thousands of images per month since June 2006, processing the Envisat/MERIS Full Resolution raw data as soon as they are acquired.

Our current areas of activity are:

  • software development
  • environmental acquisition and processing systems
  • direct acquisition systems (ESA/DDS, Eumetsat/EUMETCAST)
  • image generation from raw data, orthorectification and mosaics

We also provide services such as:

  • a comprehensive maintenance and support program which provides operational support, software and hardware maintenance and enhancements
  • technical consultancy
  • feasibility, design and pre-phase studies
  • system prototyping

EOSNAP Web Site Disclaimer

Thank you for visiting this EOSNAP/Chelys Web site. Chelys may provide links to Web pages that are not part of the or domain. These sites are managed by organizations, companies, or individuals and not under Chelys control, and Chelys is not responsible for the information or links you may find there. Chelys provides links to these sites merely as a convenience and the presence of these links is not a Chelys endorsement of the sites. Chelys is not responsible for the information collection practices of non-Chelys sites. Once you link to another site, you are subject to the privacy policy of the new site, and you should read that site’s policies on privacy and information collection.

Guidelines Regarding the Use or Reproduction of Chelys Material Obtained From a EOSNAP Web Pages

Chelys generally has no objection to the reproduction and use of Chelys material (e.g., still or motion picture photography; or World Wide Web pages), subject to the following conditions:

  1. You may use Chelys imagery for educational or informational purposes, including photo collections, textbooks, public exhibits and Internet Web pages.
  2. Chelys material may not be used to state or imply the endorsement by Chelys or by any Chelys employee of a commercial product, service, or activity, or used in any manner that might mislead. If the Chelys material is to be used for commercial purposes, especially including advertisements, it must not explicitly or implicitly convey Chelys’ endorsement of commercial goods or services. If a Chelys image includes an identifiable person, using the image for commercial purposes may infringe that person’s right of privacy or publicity, and permission should be obtained from the person.
  3. Chelys should be acknowledged as the source of the material.
  4. It is unlawful to falsely claim copyright or other rights in Chelys material.
  5. Chelys shall in no way be liable for any costs, expenses, claims, or demands arising out of the use of Chelys material by a recipient or a recipient’s distributees.
  6. Chelys does not indemnify nor hold harmless users of Chelys material, nor release such users from copyright infringement, nor grant exclusive use rights with respect to Chelys material.
  7. Chelys material is not protected by copyright unless noted. If copyrighted, permission should be obtained from the copyright owner prior to use. If not copyrighted, Chelys material may be reproduced and distributed without further permission from Chelys.
  8. Chelys personnel are not authorized to sign indemnity or hold harmless statements, releases from copyright infringement, or documents granting exclusive use rights.

For answers to additional questions, contact:

Via Erasmo Gattamelata, 3
00176 Rome

Internet: eosnap (at)


MERIS images are generated from Level-0 (raw) data; ASAR images are generated from Level-0 (raw) and Level-1b products. MODIS images are generated from Level-1b data. All types of images are from the Chelys SRRS (Satellite Rapid Response System). Envisat source Level-0 and Level-1b products are provided by ESA. MODIS Level-1b products are provided by NASA. AVHRR3 Level-1b products are provided by Eumetsat.

Unless indicated otherwise, the written information on this website comes from the following sources:

  • News reports on global events – BBC, Reuters and Bloomberg
  • Reports on tropical cyclones and typhoons – Joint Typhoon Warning Center (JTWC)
  • Updates on hurricanes – National Oceanographic and Atmospheric Administration (NOAA)
  • Geographical or scientific facts and figures regarding places or meteorological phenomena – Wikipedia
  • News regarding environmental issues – Greenpeace and WaterAid