Members Login
Username 
 
Password 
    Remember Me  
SoCal GIS: Local Government GIS User Group -> SoCal GIS Forum -> LAR-IAC -> LAR-IAC Imagery Compression Options
Post Info TOPIC: LAR-IAC Imagery Compression Options
mzuber


Status: Offline
Posts: 6
Date:
LAR-IAC Imagery Compression Options
Permalink  

Hello all.

 I'm curious as to what other members of LAR-IAC will be doing with their data once it is delivered.  The City of Palmdale is receiving a large data set, somewhere in the range of 1.5-1.7 terabytes.  The orthoimagery alone is near 500 gigabytes.  We are going to have some tiled MrSID compression done as well as a mosaic made.  Our idea is to employ a couple tiled data sets at different compression ratios to allow quick network delivery of the imagery but also capitalize on the fantastic resolution.  I can provide our exact plan if it is necessary.  If anyone has any ideas or experience in dealing with imagery data (compression, network delivery, storage, etc.), please share those thoughts in this topic.  I appreciate any input.

 Thanks SoCal GIS!  Take care. ~Marc Zuber~



__________________
Marc Zuber | Assistant GIS Specialist | City of Palmdale | Public Works - Traffic - GIS | 38250 Sierra Hwy Palmdale, CA 93550 | 661 267 5354 | mzuber@cityofpalmdale.org
Barry


Status: Offline
Posts: 8
Date:
Permalink  

We plan to compress it with MrSID at different compression ratios. We've found there's surprisingly little difference in quality unless you crank the compression way up. Our data is on the way, so ask me again after it's loaded up and gone through a couple of tests.

Barry

__________________
Barry Waite GIS Administrator Carson, California
jeanmchl


Status: Offline
Posts: 2
Date:
Permalink  

Marc,

You may also want to consider( if space allows) to generate raster catalogs in ArcSDE. I've loaded ~3 TB into SDE raster catalogs and am very pleased by the response. Storage of replacement tiles are easily managed as well because you can continue to load "new" imagery which overlays the old stuff without having to remove previous data resources. Storing images in this manner allows for long-term storage efficiency plus temporal recordkeeping.

__________________
COPGIS


Status: Offline
Posts: 21
Date:
Permalink  

We plan to load the images into our Oracle/ArcSDE GDB as a mosaiced and pyramided raster.  We will be following ESRI's recommendations in the Managing Raster Data in a Geodatabase―Best Practices presnetation from the 2006 ESRI Users Conference. 

For those that have a RDBMS (Oracle, SQL Server, etc.) and the conference proceedings, I highly recommend looking at this presentation.  I tried to post it here but because we are using the free version of ActiveBoards we can only upload images and not files, sorry.

We are in the middle of transitioning to new backend everything (redundant database servers, Oracle 10g, ArcSDE 9.1, blah, blah, blah).  Fortunately/unfortunately the data will be delivered just before the transition and my customers are getting anxious, so we will be loading the data into our old environment and the new environment. 


For Oracle DBA types, we have created seperate tablespaces for the following per ESRI's best practices referenced in the presentation noted above:

Feature Classes

Feature Class Indexes

Raster Blocks

Raster Indexes



__________________
Brian GIS Coordinator, City of Pasadena | SoCal GIS Founder/Administrator | You don't always have to be having fun to have fun.
MapMaker


Status: Offline
Posts: 21
Date:
Permalink  

You can access the conference session and pdf file here:

http://gismap.santa-monica.org/website/download/raster_gdb.pdf
http://gismap.santa-monica.org/website/download/raster_gdb.mp4

I will keep them there for a while before I remove them.

mike



__________________
Michael A. Carson, GIS Coordinator, City of Santa Monica
Page 1 of 1  sorted by
 
Quick Reply

Please log in to post quick replies.
SoCal GIS: Local Government GIS User Group -> SoCal GIS Forum -> LAR-IAC -> LAR-IAC Imagery Compression Options
Tweet this page Post to Digg Post to Del.icio.us


Create your own FREE Forum
Report Abuse 		Powered by ActiveBoard