<div dir="ltr">Folks,<div><br></div><div>The changes I made were mostly focused on supporting large DBF files which don't have the 32bit offsets issue. </div><div><br></div><div>The offsets for shapefiles are actually to 16bit words, so in theory if the offsets were treated as unsigned 32bit values they could address up to 8GB .shp files. I don't recall however, if I ever got that working. Even if it was done it is not clear to me these files would work smoothly with other applications. </div>
<div><br></div><div style>I'd been hoping someone else might have authoritative comment in this thread. :-)</div><div style><br></div><div style>Best regards,</div><div style>Frank</div></div><div class="gmail_extra">
<br><br><div class="gmail_quote">On Wed, May 8, 2013 at 9:49 PM, Stephen Woodbridge <span dir="ltr"><<a href="mailto:woodbri@swoodbridge.com" target="_blank">woodbri@swoodbridge.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
In general the shapefile spec is owned by ERSI and unless they change the spec you will have a problem. Last I knew, there are pointers/offsets inside the shapefile that are only 32bits wide per the spec. it is because of these that you are limited to 2GB.<br>
<br>
At some point I thought Frank W or someone was working on a version of shapelib that could support greater than 2GB, but only programs that used that version would be able to read/write these larger files. I have not heard anything on that front in a while so I don't know if that was just talk, or code ever materialized.<br>
<br>
-Steve W<div class="HOEnZb"><div class="h5"><br>
<br>
On 5/9/2013 12:32 AM, Rahkonen Jukka wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi,<br>
<br>
I am not sure either if reading >2GB shapefiles works with the native<br>
shp reader on all platforms, but as the ticket says, you should be<br>
able to use OGR connection in the mapfile even with your current<br>
version. If you use OGR you can also split the shapefile into pieces<br>
and read them through the ogr tileindex system which may be faster<br>
sometimes.<br>
<br>
-Jukka Rahkonen-<br>
<br>
______________________________<u></u>__ Andrea Peri wrote:<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
If it don't work you should evalute the option to use spatialite.<br>
It work well with dataset greater than 2GB . I use it with<br>
mapserver 6.3dev and gdal 1.10.<br>
</blockquote>
<br>
<br>
<br>
2013/5/9 Roger André <<a href="mailto:randre@gmail.com" target="_blank">randre@gmail.com</a><mailto:<a href="mailto:randre@gmail.com" target="_blank">randr<u></u>e@gmail.com</a>>><br>
Pretty sure I just hit<br>
this<<a href="http://trac.osgeo.org/mapserver/ticket/3514" target="_blank">http://trac.osgeo.org/<u></u>mapserver/ticket/3514</a>> problem in my 6.0.3<br>
local stack. I haven't tested it in the current release, but does<br>
anyone know for sure that a shapefile with any component larger than<br>
2GB works in 6.2?<br>
<br>
Roger<br>
<br>
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<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
<br>
<br>
<br>
-- ----------------- Andrea Peri . . . . . . . . . qwerty àèìòù<br>
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</div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br>---------------------------------------+--------------------------------------<br>I set the clouds in motion - turn up | Frank Warmerdam, <a href="mailto:warmerdam@pobox.com" target="_blank">warmerdam@pobox.com</a><br>
light and sound - activate the windows | <a href="http://pobox.com/~warmerdam" target="_blank">http://pobox.com/~warmerdam</a><br>and watch the world go round - Rush | Geospatial Software Developer<br>
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