CREPAD
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FAQs
How can I become a CREPAD user?
To become a CREPAD user, you must fill an application form clicked on "IMAGES CATALOGUE " option from the left hand side menu.
How can I ask for CREPAD images?
Once you have been accepted as a CREPAD user, you can visit our web catalogue and display those images you are interested in. Once you have verified those passes of the satellite that meet your requirements, select and add them to your order.
How much do the images cost?
The cost and availability of the images depend on the commercial policy of each satellite’s owner. Nowadays, CREPAD supplies free images from the AVHRR, SeaWiFS, MODIS and MOS sensors for scientific applications previously approved and with no commercial purposes.
How can I visit the CREPAD images’ catalogue?
You can visit and search in our catalogue as a visitor(without using password) or as user (using password). You can access to the link Images’ catalogue on the left menu in this webpage. Use guest to log in and follow the instructions to search for the desired images. Bear in mind that the search results will present a quicklook of the complete passes and not the final CREPAD products.
Is it possible to download the images from the catalogue?
As each image has more than 100MB of information, we only present a thumbnail in the catalogue. The image can be
enlarged by clicking on the thumbnail. The actual data can be directly requested to CREPAD by registration.
Can the CREPAD images be used in the users’ projects and applications?
To be able to use images from CREPAD you will have to download and accept the document with the terms and conditions for using our images. Moreover, you will have to mention the source of the images at all times.
What are the applications of the CREPAD products and services?
The applications for our data are numerous:
Civil defense: catastrophes prevention, damages evaluation, support to rescue services...
Oceanography: shoals of fish detection, water quality control, oil spills detection...
Agriculture: prediction of crops yield, hydrologic modelling, identification of land uses...
Environment: desertification identification and study, landslides, urban climatology...
Forests: fire risk identification, damages evaluation, forest maps...
Is it possible to obtain images without processing?
CREPAD can provide images from the AVHRR sensor in Sharp level L1B format (ESA format) and images from the SeaWiFS & MODIS sensor in level 0 (NASA format) to all those users that prefer to apply their own algorithms, radiometric calibrations and atmospheric and geometric corrections.
Can I ask for the individual bands of an image?
CREPAD can supply the individual spectral bands of each image in individual files:
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Without radiometric or any other calibration, in generic binary format.
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With radiometric calibration and geometrical corrections, in generic binary format.
How are the orders delivered?
The usual support medium to deliver the orders is the CD-ROM, eventhough the data can also be sent via FTP or,
in special cases with a big volume of data, in a magnetic tape. If the images are not too big they can be sent by email.