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#1
angel.spatial

angel.spatial

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Hello all,

I am wanting to mosaic about 14 jp2 images together into one, but I am having some trouble with the result.

I am wanting a result that really just overlays all of the images in the order that I place them (tried First Image method in ArcMap already). What is the best method to accomplish this?

Is there an open source alternative that may do this differently? Maybe another program altogether?

Thanks as usual,

angel
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#2
Hans van der Maarel

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Global Mapper perhaps?

From your description I gather that the images are partially overlapping and you want to be able to control which image gets top priority on those overlaps, is that correct?
Hans van der Maarel - Cartotalk Editor
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#3
frax

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How do you mosaic/overlay them? I would just use the raster calculator in Spatial Analyst for the operation you are refering to - you would write an operation that says if image a is null, then use image b. Make sure you set the analysis window to the outermost extent of all images.
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#4
paul

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Since you're starting with a compressed format (jp2), you might have some size limitation issues, unless you can go directly to jp2 or ecw. We use ER Mapper for mosaicking and compression, and it works beautifully. Kind of pricey though. If the images aren't huge, or if you have a 64bit OS, you might have luck with just copy/pasting images together in Manifold.

#5
mdsumner

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You can mosaic images with the FWTools gdalwarp utility: http://www.gdal.org/gdalwarp.html

FWTools is an essential bit of kit actually, let me know if you want to follow this up.

#6
angel.spatial

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Thanks everyone,

Yeah I want the top image to receive priority.

I am limited to FOSS, ArcInfo, or Idrisi for this.

I will try FWTools and experiment (IF you have a best use for this, let me know).

I will also try Spatial Analyst in ArcMap, but I have had no luck with ArcMap so far. The overlapping ends up as "0" or "No data"

Thanks again

angel
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