I have Quickbird images of 0.6 m resolution, how I can check that the image is true/original? One characteristic is to check its resolution to show that it is either it is 0.6 or not. What are the other characteristics that I can check?
Do you have a head file for your Quickbird imagery? if yes, you could find detailed processing records for this image, for example what level product.
They are providing metadata for every satellite imagery. Kindly check the file. Otherwise check .dbf file it may use.
Dear Syed,
it is not easy to find if the image is untouched or not. It is possible to find the resolution or projection changes by using metadata file. The metadata file is produced by data acq. companies and basically records the acquisition time/ location, image pixel resolutions, projection/ datum informations, image boundary etc..Therefore you can check whether these properties are changed or not. ( I assume that the metadata file is not changed) .
However, it is not possible to know that the pixel intensity values are changed or not. Maybe you can request the md5 of the original image file from the image reseller company.
Good Luck :)
I think the author's question is to judge if he/she has a true 0.6m resolution image. some images are resampled to finer resolution from coarse images. A good way is to find knowing objects on your images, such as cars in cities, narrow paths in rural areas, if you can clearly see objects with width of 0.6-1.0m with 1-2 pixels covering the width. then you have a true 0.6m resolution
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