Hello,
How to get how many groups and their characteristics of HDF4 file. Also how to get how many Vdata are there and what are their names.
regards
Prakash
Hello Prakash,
Vgetvgroups and VSgetvdatas will give you the number of vgroups and vdatas
in the file, respectively.
Please see this HDF4 User's Guide for details on them and on vdatas (Chapter
4) and vgroups (Chapter 5):
http://www.hdfgroup.org/ftp/HDF/Documentation/HDF4.2.7/HDF427_UserGd.pdf
Thank you,
Binh-Minh
···
_____
From: hdf-forum-bounces@hdfgroup.org [mailto:hdf-forum-bounces@hdfgroup.org]
On Behalf Of Surya Prakash
Sent: Friday, February 17, 2012 12:07 AM
To: hdf-forum@hdfgroup.org
Subject: [Hdf-forum] Groups & Vdata
Hello,
How to get how many groups and their characteristics of HDF4 file. Also how
to get how many Vdata are there and what are their names.
regards
Prakash
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Hello
I was using HDF41r5s, is it not possible to get the info I am looking for in this version?
regards
Prakash
Hello Prakash,
Vgetvgroups and VSgetvdatas will give you
the number of vgroups and vdatas in the file, respectively.
Please see this HDF4 User’s Guide for
details on them and on vdatas (Chapter 4) and vgroups (Chapter 5):
http://www.hdfgroup.org/ftp/HDF/Documentation/HDF4.2.7/HDF427_UserGd.pdf
Thank you,
Binh-Minh
From:
hdf-forum-bounces@hdfgroup.org [mailto:hdf-forum-bounces@hdfgroup.org] On Behalf Of Surya Prakash
···
On Fri, 17 Feb 2012 11:06:26 +0530 wrote
Sent: Friday, February 17, 2012
12:07 AM
Subject: [Hdf-forum] Groups &
Vdata
Hello,
How to get how many groups and their characteristics of HDF4 file. Also how to
get how many Vdata are there and what are their names.
regards
Prakash
FollowRediff Deal ho jaye!to get exciting offers in your city everyday.
_______________________________________________
Hdf-forum is for HDF software users discussion.
http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
Depending on how you want to use the information, you could also create a
Content Map (and XML document) for the file and then use a tool like "grep"
to count the number of occurrences of Vdata (Tables) and Vgroups (Groups) in
the Map.
You can find the h4mapwriter distribution, and more information about HDF4
File Content Maps, at
http://www.hdfgroup.org/projects/h4map/
In general you would do something like:
$ h4mapwriter file.hdf file.hdf.map.xml
$ grep "h4:Table name=" file.hdf.map.xml > file.Vdata
$ wc -l file.Vdata
21 file.Vdata
$ grep "h4:Group name=" file.hdf.map.xml > file.Vgroups
$ wc -l file.Vgroups
4 file.Vgroups
You can also look at the content of file.Vgroups or file. Vdata or
file.hdf.map.xml to see more about the objects in the original HDF4 file.
$ cat file.Vgroups
<h4:Group name="L2_Support_atmospheric&surface_product" path="/"
class="SWATH" id="ID_G1">
<h4:Group name="Geolocation Fields"
path="/L2_Support_atmospheric&surface_product" class="SWATH Vgroup"
id="ID_G2">
<h4:Group name="Data Fields"
path="/L2_Support_atmospheric&surface_product" class="SWATH Vgroup"
id="ID_G3">
<h4:Group name="Swath Attributes"
path="/L2_Support_atmospheric&surface_product" class="SWATH Vgroup"
id="ID_G4">
The link above will also take you to the schema for the Map files.
If you want to use the number of Vdata & Vgroups programatically, the HDF4
APIs are probably the way to go. If you just want to find out what's in the
file, mapping it or using an HDF4 utility like "hdp" may be worth exploring.
-- Ruth
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