how to brake down sid images

[kury]

Hi there
Excuse-me if this is not the suitable place to ask this question but this issue is boring me a lot. I use to sail in a big lake, here in Brazil, and I use for the navigation purpose a geo-referenced NASA satellite image, namely the Landsat 7 Circa 2000, frame S22-30-2000, that comes in .SID format, which I manage to run in a navigation software called OziExplorer. The problem is that this frame is too large (100 MB) having many areas that I do not need. For this reason I would like to break down this frame in smaller portions, retaining the geo-referenced characteristics so I can still use them for navigation. Is it possible and if yes, how?
Thank you

[rparker]

The product you need is called "GeoExpress Tools". It has all of the features of GeoExpress except for the ability to encode new MrSID images from other image formats, but you can edit existing MrSID images all you want.

GeoExpress 7 has new features to make cropping easier. You can now tile images using a grid and save them as MrSID images or TIFF or JPEG 2000.

To try the software for free, download a trial of GeoExpress 7 from our website.

h_t_t_p://w_w_w.lizardtech.com/products/geo/trial.php

[kury]

Yes, this software is fantastic. I even could merge MrSID images. The only problem, I could not save images in MrSID format after cropping them from larger SID files. Maybe somebody could help me on this?

Thank's :D

[rparker]

MrSID should be available as an output format on the properties tab. It is certainly possible to crop a large MrSID file into several smaller MrSID tiles. If you still need support, please contact support using this form:

h_t_t_p://w_w_w.lizardtech.com/support/contact.php

Please let them know the steps you have tried.

[kury]

Hi Robert!

Thank you for your postings:

I was using GeoExpress View instead of GeoExpress 7, so that´s the reason I was unable to save the files in MrSid format. I saved the pictures I cropped from a large NASA MrSid file in .jpg format but the resulting files, even being a fraction of the original picture, if added together, use much more disk space than the file on which I was working!

I downloaded the GeoExpress 7 Trial but ... pity, I can´t use the maps because Trial Version inserts all that X X X X X in the pictures, making them very ugly.

If you know of a software that converts raster image files to MrSid Generation 2, please let me know.

Regards

Edward Kurylenko

[rparker]

GeoExpress 7 converts raster files to MrSID Generation 2, MrSID Generation 3, and JPEG 2000.

Yes, the trial version does watermark the output with X's, but the full version does not.

In GeoExpress 7, you can save your cropped images in MrSID format rather than JPEG, which will use a lot less disk space.

So whether you want to work with existing MrSID files or convert other files to MrSID, GeoExpress 7 is the way to go.

I hope that helps.