[MS4W-Users] Using MS4W / GDAL to create very small images for use in an old GPS unit.

[Rahkonen Jukka (MML)]

Hi,

I would have a try with OpenJPEG JPEG2000 driver. That is open source. I would not involve Mapserver into this but use just gdal_translate but if you need a web service then WCS service with JPEG2000 outputformat should work. ECW and MrSID would most probably work, and for using them you would most probably need an expensive license.

-Jukka Rahkonen-

Lähettäjä: MS4W-Users <ms4w-users-bounces at lists.ms4w.com> Puolesta Mark Volz via MS4W-Users
Lähetetty: torstai 8. lokakuuta 2020 22.59
Vastaanottaja: Discussions for MS4W (MapServer for Windows) <ms4w-users at lists.ms4w.com>
Kopio: Mark Volz <MarkVolz at co.lyon.mn.us>
Aihe: [MS4W-Users] Using MS4W / GDAL to create very small images for use in an old GPS unit.

Hello,

I would like to update the air photos that we have on an older GPS unit.  Currently the GPS unit has a few small MrSID air photos.  I need to create a very small file as the unit is old and has little RAM.  I created a GeoTIFF with a very aggressive JPEG compression (30%).  I was happy with size of the file and the relative quality.  Unfortunately, when I loaded the layer into my GPS unit the unit complained that it could not load compressed images, which is funny because MrSID files are already compressed.

I am wondering if there is a way to create very small files in a format other than Tiff.  My understanding is that the unit can load ECW, JPEG, JPEG2000, MrSid, and GeoTIFF files.

Thank You!

Sincerely,
Mark Volz, GISP
Lyon County GIS Coordinator

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