Import compressed (LZW) Geotiff - offline

AlexGunko — Thu, 17 Mar 2016 14:02:22 GMT

Hi there,

I'm a developer in a web map project.

I'm working on an offline Import-geotiff task, everything works great besides compressed files..

I am using a library that parses the file but can handle only uncompressed files and with Packbits compression.

That's how I did it: The library provides me the image location and creates a canvas element with the image, then I create a graphic where the image should be and with a symbol of the image and it's size. The symbol is made using jsonUtils when the url is canvas.toDataURL() (In that way the canvas gives us a dataURL of a .png so the browser can handle this). The size of the symbol is changes as the user zoom in/out.

My questions are:

Most of the tiff/tif images we work with are compressed with the LZW system, is there any way I can decompress the image before I start the process? Or any way I can parse the file?
My solution with the symbol seems to be a little bit awkward, Is there any better way to do this?

If the above doesn't make sense - has anyone ever managed to import a tiff to a js client without using server side tools?

Thanks in advance, Ophir.

Re: Placing Geotiff images on my map (offline)

RobertScheitlin__GISP — Thu, 17 Mar 2016 14:19:24 GMT

Alex,

I take it you have not seen the MapImageLayer class in the JS API.

MapImageLayer | API Reference | ArcGIS API for JavaScript

Re: Placing Geotiff images on my map (offline)

AlexGunko — Thu, 17 Mar 2016 15:21:27 GMT

The solution has to be offline and MapImage requires a href.

Re: Import compressed (LZW) Geotiff - offline

RobertScheitlin__GISP — Thu, 17 Mar 2016 16:09:28 GMT

Alex,

Hmm. Did not realize that was requirement. Ignore last then.

topic Re: Placing Geotiff images on my map (offline) in ArcGIS JavaScript Maps SDK Questions

Import compressed (LZW) Geotiff - offline

Re: Placing Geotiff images on my map (offline)

Re: Placing Geotiff images on my map (offline)

Re: Import compressed (LZW) Geotiff - offline