Tag: perl

Image Geotagging

Geotagging is the process of adding geographical identification metadata to various media such as photographs, video, websites, or RSS feeds and is a form of geospatial metadata. These data usually consist of latitude and longitude coordinates, though they can also include altitude, bearing, accuracy data, and place names.[1]

Geotagging standards in electronic file formats:

  1. JPEG photos
  2. HTML pages: ICBM method, RDF feeds, Microformat, Wikipedia, Geotagging in tag-based systems & Geoblogging

the most famous API and Application on image geotagging is exiftool. [2]

Geotagging with ExifTool[3]
The ExifTool geotagging feature adds GPS tags to images based on data from a GPS track log file. The GPS track log file is loaded, and linear interpolation is used to determine the GPS position at the time of the image, then the following tags are written to the image:

  • GPSLatitude
  • GPSLatitudeRef
  • GPSLongitude
  • GPSLongitudeRef
  • GPSAltitude
  • GPSAltitudeRef
  • GPSDateStamp
  • GPSTimeStamp

Currently supported GPS track log file formats:

  • GPX
  • NMEA (RMC, GGA, GLL and GSA sentences)
  • KML
  • Garmin XML
  • Magellan eXplorist PMGNTRK

Test Website:

  1. http://regex.info/exif.cgi
  2. http://locr.com

Examples: [4]


EXIF stands for “Exchangeable Image File Format”. This type of information is formatted according to the TIFF specification, and may be found in JPG, TIFF, PNG, MIFF and HDP images, as well as many TIFF-based RAW images, and even some AVI and MOV videos. [5]

Applications based on exiftool:

  • http://geotag.sourceforge.net/?q=node/1
  • http://www.carto.net/projects/photoTools/gpsPhoto/
  • http://studio.messlinger.com/2009/03/08/exiftool-and-the-automator/
  • others [6]

[1] http://en.wikipedia.org/wiki/Geotagging
[2] http://www.sno.phy.queensu.ca/~phil/exiftool/
[3] http://www.sno.phy.queensu.ca/~phil/exiftool/geotag.html
[3][oldlink] http://cpansearch.perl.org/src/EXIFTOOL/Image-ExifTool-7.82/html/geotag.html
[4] http://www.sno.phy.queensu.ca/~phil/exiftool/exiftool_pod.html
[5] http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/EXIF.html
[6] http://www.sno.phy.queensu.ca/~phil/exiftool/#links

logwatch error because of undefined timezone

yesterday I changed timezone on my server. And I got report about this error:

ERROR: Date::Manip unable to determine TimeZone.

Execute the following command in a shell prompt:
        perldoc Date::Manip
The section titled TIMEZONES describes valid TimeZones
and where they can be defined.

you should read documentation of perl module Date::Manip to define your timezone.
This is what the list of timezone that I have got from ‘perldoc Date::Manip’.

       The following time zone names are currently understood (and can be used in parsing dates).  These are zones defined in RFC 822.

           Universal:  GMT, UT
           US zones :  EST, EDT, CST, CDT, MST, MDT, PST, PDT
           Military :  A to Z (except J)
           Other    :  +HHMM or -HHMM
           ISO 8601 :  +HH:MM, +HH, -HH:MM, -HH

       In addition, the following time zone abbreviations are also accepted.  In a few cases, the same abbreviation is used for two different time zones
       (for example, NST stands for Newfoundland Standard -0330 and North Sumatra +0630).  In these cases, only 1 of the two is available.  The one pre-
       ceded by a "#" sign is NOT available but is documented here for completeness.  This list of zones comes in part from the Time::Zone module by Gra-
       ham Barr, David Muir Sharnoff, and Paul Foley (with several additions by myself).

             IDLW    -1200    International Date Line West
             NT      -1100    Nome
             HST     -1000    Hawaii Standard
             CAT     -1000    Central Alaska
             AHST    -1000    Alaska-Hawaii Standard
             AKST    -0900    Alaska Standard
             YST     -0900    Yukon Standard
             HDT     -0900    Hawaii Daylight
             AKDT    -0800    Alaska Daylight
             YDT     -0800    Yukon Daylight
             PST     -0800    Pacific Standard
             PDT     -0700    Pacific Daylight
             MST     -0700    Mountain Standard
             MDT     -0600    Mountain Daylight
             CST     -0600    Central Standard
             CDT     -0500    Central Daylight
             EST     -0500    Eastern Standard
             ACT     -0500    Brazil, Acre
             PET     -0500    Peruvian Time
             VET     -0430    Venezuela
             SAT     -0400    Chile
             CLT     -0400    Chile Standard
             CLST    -0400    Chile Standard
             BOT     -0400    Bolivia
             EDT     -0400    Eastern Daylight
             AST     -0400    Atlantic Standard
             AMT     -0400    Brazil, Amazon
             ACST    -0400    Brazil, Acre Daylight
            #NST     -0330    Newfoundland Standard       nst=North Sumatra    +0630
             NFT     -0330    Newfoundland
             CLDT    -0300    Chile Daylight
            #GST     -0300    Greenland Standard          gst=Guam Standard    +1000
            #BST     -0300    Brazil Standard             bst=British Summer   +0100
            #BRST    -0300    Brazil Standard
             BRT     -0300    Brazil Standard
             AMST    -0300    Brazil, Amazon Daylight
             ADT     -0300    Atlantic Daylight
             ART     -0300    Argentina
             UYT     -0300    Uruguay
             NDT     -0230    Newfoundland Daylight
             ARST    -0200    Argentina Daylight
             AT      -0200    Azores
             BRST    -0200    Brazil Daylight (official time)
             FNT     -0200    Brazil, Fernando de Noronha
             UYST    -0200    Uruguay
             WAT     -0100    West Africa
             FNST    -0100    Brazil, Fernando de Noronha Daylight
             GMT     +0000    Greenwich Mean
             UT      +0000    Universal (Coordinated)
             UTC     +0000    Universal (Coordinated)
             WET     +0000    Western European
             CET     +0100    Central European
             FWT     +0100    French Winter
             MET     +0100    Middle European
             MEZ     +0100    Middle European
             MEWT    +0100    Middle European Winter
             SWT     +0100    Swedish Winter
             BST     +0100    British Summer              bst=Brazil standard  -0300
             GB      +0100    GMT with daylight saving
             WEST    +0100    Western European Daylight
             CEST    +0200    Central European Summer
             EET     +0200    Eastern Europe, USSR Zone 1
             FST     +0200    French Summer
             MEST    +0200    Middle European Summer
             MESZ    +0200    Middle European Summer
             METDST  +0200    An alias for MEST used by HP-UX
             SAST    +0200    South African Standard
             SST     +0200    Swedish Summer              sst=South Sumatra    +0700
             EEST    +0300    Eastern Europe Summer
             EETDST  +0300    An alias for eest used by HP-UX
             BT      +0300    Baghdad, USSR Zone 2
             MSK     +0300    Moscow
             EAT     +0300    East Africa
             IT      +0330    Iran
             ZP4     +0400    USSR Zone 3
             MSD     +0300    Moscow Daylight
             ZP5     +0500    USSR Zone 4
             YEKT    +0500    Yeakaterinburg time zone, Russia
             YEKST   +0500    Yeakaterinburg summer time zone, Russia
             IST     +0530    Indian Standard
             ZP6     +0600    USSR Zone 5
             NOVT    +0600    Novosibirsk winter time zone, Russia
             OMST    +0600    Omsk time zone, Russia
             NST     +0630    North Sumatra               nst=Newfoundland Std -0330
            #SST     +0700    South Sumatra, USSR Zone 6  sst=Swedish Summer   +0200
             JAVT    +0700    Java
             NOVST   +0700    Novosibirsk summer time zone, Russia
             ICT     +0700    Indo China Time
             KRAT    +0700    Krasnoyarsk, Russia
             MYT     +0800    Malaysia
             CCT     +0800    China Coast, USSR Zone 7
             KRAST   +0800    Krasnoyarsk, Russia Daylight
             AWST    +0800    Australian Western Standard
             WST     +0800    West Australian Standard
             PHT     +0800    Asia Manila
             JST     +0900    Japan Standard, USSR Zone 8
             ROK     +0900    Republic of Korea
             ACST    +0930    Australian Central Standard
             CAST    +0930    Central Australian Standard
             AEST    +1000    Australian Eastern Standard
             EAST    +1000    Eastern Australian Standard
             GST     +1000    Guam Standard, USSR Zone 9  gst=Greenland Std    -0300
             CHST    +1000    Guam Standard, USSR Zone 9  gst=Greenland Std    -0300
             ACDT    +1030    Australian Central Daylight
             CADT    +1030    Central Australian Daylight
             AEDT    +1100    Australian Eastern Daylight
             EADT    +1100    Eastern Australian Daylight
             IDLE    +1200    International Date Line East
             NZST    +1200    New Zealand Standard
             NZT     +1200    New Zealand
             NZDT    +1300    New Zealand Daylight

       Others can be added in the future upon request.

       Date::Manip must be able to determine the time zone the user is in.  It does this by looking in the following places:

          $Date::Manip::TZ (set with Date_Init or in Manip.pm)
          the Unix `date` command (if available)

       At least one of these should contain a time zone in one of the supported forms.  If none do by default, the TZ variable must be set with Date_Init.

       The time zone may be in the STD#DST format (in which case both abbreviations must be in the table above) or any of the formats described above.
       The STD#DST format is NOT available when parsing a date however.  The following forms are also available and are treated similar to the STD#DST


I configure the timezone using command ‘dpkg-reconfigure tzdata’,
And my /etc/timezone consist of unknown format for perl module Date::Manip.
the content of /etc/timezone should change into one of the format above.

in this case, i use timezone JAVT. because I love Java ;-)

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