We need a small tool for adding tags (small text/numerical elements) to TIFF image files.

The pre 2009 aerial photos contain metadata inserted by a scanning company. You can see what's in the 2008 photos by doing something like tiffinfo ~arsf/arsf_data/2008/flight_data/uk/GB08_18-2008_176a_River_Frome/photography/08_03_8190.tif | less.

Mostly they seem to have created an XML metadata section. Many of their tags relate to the scanning process and are not relevant. Ideally we should duplicate the XML metadata in addition to putting data into relevant tags.

There are a large number of defined tags and a mechanism for picking "free" tags. I'd suggest trying to conform to the EXIF standard where possible.

​http://www.awaresystems.be/imaging/tiff/tifftags.html

• for the exif bit, see private ifd tags -> exif, or look at ​http://www.exif.org/

For example, there are predefined tags for GPS location that we may wish to use as that'd mean the images could be correctly geolocated in a standard package.

• ​http://www.awaresystems.be/imaging/tiff/tifftags/privateifd/gps/gpsareainformation.html

There are also some bits for descriptions and comments, which could be used for the project info.. Alternatively, you could pick one of the "free" ranges and make up your own tag. Before making up your own tag, please a) check for a standard one and b) check what the 2008 photos did.

Suggested approach:

• review EXIF / TIFF tag documents to familarise yourself with the standard tags
• identify suitable tools / libraries for working with TIFF tags (google "python tiff tag" or "python exif"?)
• duplicate the XML metadata in a 2008 photo for a 2009 one
• insert the XML metadata into a 2009 TIFF
• insert EXIF standard additional tags (particularly geolocation ones) into the 2009 TIFF

Data location: ~arsf/arsf_data/2009/flight_data/uk/GB06_02-2009_280b_Freiston_shore

Data arrived from ARSF via network transfer on 7th October 2009.

Scientific objective: dont have access to application form

Priority:

PI: T. Spencer

Sensors:

• Eagle
• Hawk
• Leica LIDAR (Unfunded)

build number : 2010.01.18.1 system : pmpc974

to reproduce, open a selection of files (tested with 2, 3, 4, and 5 files) with fence unticked and any number of skipped points. Then click fence and select and area of the lines, click file, open and then check the fence box and click refresh. the expected result is to see the fenced area of the lines appear identically to when they were displayed as part of the overall lines. However the fenced lines display with different flight line colours.