RE: Gridding memory allocation problem

[Mike Dunne]

Title: Gridding memory allocation problem

Hi,

The min curvature gridding option has a memory requirement related to the nr input points -

nr points * 76 bytes (i.e. 9 IEEE8s and 1 INT32 for each point),

and

nr output lines * nr output cells * 9 bytes (1 lot of output grid * 8bytes + 1 lot of output grid * 1 byte)

 

You can try making a coarser grid, gridding it in sections, getting more memory, or running it on a clean machine

(ie. reboot and just run the gridding option, so that no other apps are running).

Hope this helps.

 

cheers

Mike

 

 -----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Leo Romeijn
Sent: Wednesday, 2 October 2002 11:10 PM
To: ER Mapper List Server
Subject: Gridding memory allocation problem

List,

        I am trying to grid an XYZ text file (482mb), using the Minimum Curvature option with the defaults, but I keep getting an error message (listed below), and the status bar stops at about 85%. The terrain is min: 6m to max: 2400m, there is a big mountain in the scene, coming from the coastline. Has anyone else run into this problem with the Minimum Curvature option? I have been successful on smaller areas, but I am unsure why I am running out of memory or what the problem could be.

Error Box:

Gridding Terminated Abnormally

Status box:

Reading Data…

Read 17729803 points, (min:6.000 max:2442.000)

Could not allocate 851030544 bytes of memory

Connection closed…

Platform: Win2K

Ram: 2GB

Virtual Mem:

C:\ None

D:\1024mb

H:\1024mb

ER Mapper 6.3

Leo M. Romeijn

Satellite Imaging Corporation

12777 Jones Rd., Suite 370

Houston, TX 77070, USA

832.237.2900 ext.202, 832.237.2910 (Fax)

[EMAIL PROTECTED]

www.satimagingcorp.com