Lidar DEM Mosaic IMG/TIF to MrSid

by **Murali** » Sat Mar 03, 2012 7:16 am

Hi,
I have a Lidar DEM mosaic in IMG and TIF format and its elevation value range from 7 feet to 116 feet.The client need it in MrSid format. When I convert the same to MrSid in Geoexpress, Its elevation range shows 0-90ft. what is going on here.i use Arcgis 10.0 to read the file.

by **rparker** » Mon Mar 05, 2012 10:23 am

Hello,

Try using the lossless compression checkbox instead of a compression ratio.

by **Murali** » Mon Mar 05, 2012 11:09 am

My data is in 32bit floating point and I am getting error that MG4/MG3 does not support 32bit floating point, so When I am making Generation 2 MrSid, the encoding option lossless is disabled/dimmed.

by **rparker** » Mon Mar 05, 2012 11:32 am

Then it appears your options are limited, since 32-bit floating data is not supported in MG3 or MG4. I would look for ways of converting your original image to a format that is supported [1-16 bits (unsigned 8, unsigned 16, signed 8, signed 16)].

Some have had success using imagemagick to do this.

w_w_w.imagemagick.org

by **Murali** » Thu Mar 08, 2012 11:05 am

Does MG2 support 32bit floating point data.

by **rparker** » Thu Mar 08, 2012 11:09 am

MG2 does support f32-bit data, however MG2 is not a lossless format, so the pixel values will change.

Have you tried converting the 32-bit data to 8-bit (24-bit [3*8])?

Lidar DEM Mosaic IMG/TIF to MrSid

Lidar DEM Mosaic IMG/TIF to MrSid

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