<html>
<head>
<style>
.hmmessage P
{
margin:0px;
padding:0px
}
body.hmmessage
{
font-size: 10pt;
font-family:Verdana
}
</style>
</head>
<body class='hmmessage'>
Eric,<BR>
<BR>
I don't have a lot of experience loading and indexing LiDAR in a DBMS, but I can offer some insight into working with the datasets. Check the metadata or contract specs for point counts/spacing/density of the original data. The density and nominal spacing are going to contribute to the size (in point records) of the dataset, which can be huge. A sq. km LAS file can have several million points. Do a header dump of the LiDAR dataset to a text file or index shapefile to get an idea of the number of points in each file.<BR>
<BR>
I would also do all of your QC checks before loading and indexing the data in the database. I've heard that the loading isn't too bad, but indexing can take a really long time.<BR>
<BR>
This is something that I've thought about doing for a long time, but most of the software I've used works with the LAS format. Various indexing methods are used by current software packages and they run relatively quick. You've inspired me to do my own PostGIS tests.<BR>
<BR>
Good luck.<BR>
<BR>
Chris <BR>
<BR>
<BR><BR>> Date: Mon, 10 Nov 2008 10:49:52 -0500<BR>> From: ERandall@eriecountygov.org<BR>> To: postgis-users@postgis.refractions.net<BR>> Subject: [postgis-users] LiDAR data in PostGIS<BR>> <BR>> Hi All,<BR>> <BR>> Who is using LiDAR data in PostGIS? Can you comment on your experiences? I'm still awaiting delivery for my area but meanwhile have started looking at a sample from another county. I'm interested in how people are working with it and what you are finding are manageable subsets of the data. I'm experimenting with indexing it using various sized square and hexagon tilings but haven't done too much else. Thanks for comments.<BR>> <BR>> -Eric <BR>> <BR>> <BR>> _______________________________________________<BR>> postgis-users mailing list<BR>> postgis-users@postgis.refractions.net<BR>> http://postgis.refractions.net/mailman/listinfo/postgis-users<BR><BR><br /><hr />See how Windows® connects the people, information, and fun that are part of your life <a href='http://clk.atdmt.com/MRT/go/119463819/direct/01/' target='_new'>Click here</a></body>
</html>