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Science Forum Index » Image Processing Forum » Pls help: extract LIDAR data from .all files
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| John61 |
 Posted: Tue Nov 28, 2006 10:09 pm |
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Guest
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Hi,
I got a CD with LiDAR data, but all files have an extension .all. I don't
know how to unzip them to a useful format. Please help.
Thanks,
John |
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| Martin Leese |
| Posted: Wed Nov 29, 2006 12:27 am |
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Guest
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John61 wrote:
Quote: Hi,
I got a CD with LiDAR data, but all files have an extension .all. I don't
know how to unzip them to a useful format. Please help.
This might be a file format for 1-2-3 spreadsheets.
Try opening a .all file in Excel and see if it
recognizes it.
--
Regards,
Martin Leese
E-mail: please@see.Web.for.e-mail.INVALID
Web: http://members.tripod.com/martin_leese/ |
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| Martin Leese |
| Posted: Wed Nov 29, 2006 2:07 pm |
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Guest
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Martin Leese wrote:
Quote: John61 wrote:
Hi,
I got a CD with LiDAR data, but all files have an extension .all. I
don't know how to unzip them to a useful format. Please help.
This might be a file format for 1-2-3 spreadsheets.
Try opening a .all file in Excel and see if it
recognizes it.
I forgot the obvious solution. Ask the people
who supplied the LIDAR data what this .all format
is.
--
Regards,
Martin Leese
E-mail: please@see.Web.for.e-mail.INVALID
Web: http://members.tripod.com/martin_leese/ |
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| Jose |
| Posted: Thu Nov 30, 2006 11:10 am |
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Guest
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I guess excell won't open it at all because of its file-size limitation.
You'd better use a good plain text editor (textpad?) to see the guts.
If it is compressed or encripted you'll have a hard job... you could try
changing the ".all" extension to .zip .arc .arj .rar .lzh because it could
be in a common compression format
"Martin Leese" <please@see.Web.for.e-mail.INVALID> escribió en el mensaje
news:__7bh.4457$dX4.2390@clgrps13...
Quote: John61 wrote:
Hi,
I got a CD with LiDAR data, but all files have an extension .all. I don't
know how to unzip them to a useful format. Please help.
This might be a file format for 1-2-3 spreadsheets.
Try opening a .all file in Excel and see if it
recognizes it.
--
Regards,
Martin Leese
E-mail: please@see.Web.for.e-mail.INVALID
Web: http://members.tripod.com/martin_leese/ |
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| John91 |
| Posted: Thu Nov 30, 2006 11:38 pm |
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Guest
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thanks anyway. The guy is on leave for long and I can't get hold of him.
"Martin Leese" <please@see.Web.for.e-mail.INVALID> wrote in message
news:o%jbh.9797$rv4.6556@edtnps90...
Quote: Martin Leese wrote:
John61 wrote:
Hi,
I got a CD with LiDAR data, but all files have an extension .all. I
don't know how to unzip them to a useful format. Please help.
This might be a file format for 1-2-3 spreadsheets.
Try opening a .all file in Excel and see if it
recognizes it.
I forgot the obvious solution. Ask the people
who supplied the LIDAR data what this .all format
is.
--
Regards,
Martin Leese
E-mail: please@see.Web.for.e-mail.INVALID
Web: http://members.tripod.com/martin_leese/ |
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| Martin Leese |
| Posted: Fri Dec 01, 2006 1:52 am |
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Guest
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John91 wrote:
Quote: thanks anyway. The guy is on leave for long and I can't get hold of him.
Here is some general advice. LIDAR data is
supplied to clients as a cloud of X, Y, Z
coordinates. There is no standard format for
such data.
The data are often presented as columns in
plain text files or as spreadsheet files. A
search on the Web showed that Lotus 1-2-3
spreadsheet files use the extension ".all",
so I suggested you try to read a file using
the Excel spreadsheet program. I don't know
whether Excel can read Lotus 1-2-3 files.
Maybe you can find a copy of Lotus 1-2-3
somewhere and try that.
Sometimes, in addition to the X, Y, Z cloud,
the client is supplied with a raster grid.
This is derived from the cloud and, hopefully,
is geo-corrected. GeoTIFF files are popular
for this. However, the ".all" extension
doesn't fit well here.
--
Regards,
Martin Leese
E-mail: please@see.Web.for.e-mail.INVALID
Web: http://members.tripod.com/martin_leese/ |
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| gimps.sa |
| Posted: Fri Dec 01, 2006 4:47 am |
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Guest
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Hi John,
Following replies from other members of the forum, the *.all may refer
to the fact that "all" the LiDAR points are contained in the file (you
LiDAR points are unfiltered). If your vendor has not filtered the
points then you will have a file containing all returns and not
'ground' or 'canopy' returns. We recently received a LiDAR data set
with a *.xyz filename that opens in any text editor. It is possible to
open and view the data in any standard GIS package. Try DIVA GIS, (open
source). You may need to add column names X, Y, Z, Intensity, depending
on the format and the size of your data set. But I am pretty sure *.all
simply means that points are unfiltered.
If you are working on a Linux platform you can use the 'more' or 'less'
applications at the command line to get a better idea of the format.
Hope this helps and good luck
Wes
John61 wrote:
Quote: Hi,
I got a CD with LiDAR data, but all files have an extension .all. I don't
know how to unzip them to a useful format. Please help.
Thanks,
John |
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| Back to top |
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| Martin Leese |
| Posted: Fri Dec 01, 2006 6:13 pm |
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Guest
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gimps.sa wrote:
Quote: Hi John,
Following replies from other members of the forum, the *.all may refer
to the fact that "all" the LiDAR points are contained in the file (you
LiDAR points are unfiltered). If your vendor has not filtered the
points then you will have a file containing all returns and not
'ground' or 'canopy' returns. We recently received a LiDAR data set
with a *.xyz filename that opens in any text editor. It is possible to
open and view the data in any standard GIS package. Try DIVA GIS, (open
source). You may need to add column names X, Y, Z, Intensity, depending
on the format and the size of your data set. But I am pretty sure *.all
simply means that points are unfiltered.
If you are working on a Linux platform you can use the 'more' or 'less'
applications at the command line to get a better idea of the format.
If you are stuck with Windows then I strongly
recommend you install Perl. I routinely processed
LIDAR data under Windows using Perl. The cloud of
points can easily be several million, and this is
presented in a really big text file. Perl handles
such huge files easily, and can be used to add
column headers, convert Tabs to commas and other
useful stuff you need to do to import your data
into GIS packages.
--
Regards,
Martin Leese
E-mail: please@see.Web.for.e-mail.INVALID
Web: http://members.tripod.com/martin_leese/ |
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| John61 |
| Posted: Wed Dec 06, 2006 6:52 pm |
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Guest
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Thanks so much everybody, for all the info most helpful. I'm trying with
them.......
John
"Martin Leese" <please@see.Web.for.e-mail.INVALID> wrote in message
news:MN1ch.16146$rv4.13698@edtnps90...
Quote: gimps.sa wrote:
Hi John,
Following replies from other members of the forum, the *.all may refer
to the fact that "all" the LiDAR points are contained in the file (you
LiDAR points are unfiltered). If your vendor has not filtered the
points then you will have a file containing all returns and not
'ground' or 'canopy' returns. We recently received a LiDAR data set
with a *.xyz filename that opens in any text editor. It is possible to
open and view the data in any standard GIS package. Try DIVA GIS, (open
source). You may need to add column names X, Y, Z, Intensity, depending
on the format and the size of your data set. But I am pretty sure *.all
simply means that points are unfiltered.
If you are working on a Linux platform you can use the 'more' or 'less'
applications at the command line to get a better idea of the format.
If you are stuck with Windows then I strongly
recommend you install Perl. I routinely processed
LIDAR data under Windows using Perl. The cloud of
points can easily be several million, and this is
presented in a really big text file. Perl handles
such huge files easily, and can be used to add
column headers, convert Tabs to commas and other
useful stuff you need to do to import your data
into GIS packages.
--
Regards,
Martin Leese
E-mail: please@see.Web.for.e-mail.INVALID
Web: http://members.tripod.com/martin_leese/ |
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