the online meeting place for all who love our amphibians and reptiles |
|
Sand lizard markings |
Post Reply | Page <12 |
Author | |
administrator
Admin Group Joined: 01 Jan 2007 Status: Offline Points: 10 |
Post Options
Thanks(0)
|
Steve, Did you ever come up with a numerical system for keeping up with individuals in reference to your first post in this thread? It seems the concept is much along the lines of the methods used by Benson for adder, see http://www.herpetofauna.co.uk/forum/forum_posts.asp?TID=1365 &PN=1&TPN=1 The idea being that using various features such as head marking, scalation and stripe variation you can code an individual adder. It should then be easier to check previous records to see if this animal has been encountered before, using partial or complete information, rather than checking potentially hundreds of images. I've got a working example BW140206_001_M_MB_P_5152142_FZZMMWTO which translates to site/date first seen_arbitrary field number_sex_base colour (mid brown)_scalation (P = parietal, due to a striking feature)_5152142, relates to scale group counts_FZZMMWTO is after Benson and is a way to describe the stripe, in this case it translates to fore-body zigzag mid-body mirror wave tail ovals underscores are to keep it windows friendly, In theory you could maybe get the FZZMMWTO bit from a fleeting glance, then get a high degree of confidence in the identification from a photographic image scale count. |
|
Vicar
Senior Member Joined: 02 Sep 2004 Location: United Kingdom Status: Offline Points: 1184 |
Post Options
Thanks(0)
|
Heh, yeah I got some way forward in assigning marking 'types', such as number of dorsal white dot clusters (3x2, 4x1 etc), continuous dark banding etc. But, then had a chat with the folks at Marwell. They are looking at adapting their zebra automated recognition software to sand lizards. Basically their system allows you to submit a pic of a zebra, and through various transforms, you get a set of unique values, which can be translated into an individual ID. (As I understand it). Tho I'm unsure how the lizard is isolated from the context. When they get this working for Sandies, it will be far more effective than my approach, so I've stopped. Next time I see them, I'll chase progress. Currently, I use photo-fit cards, like the one I've posted under individual adder section. Edited by Vicar |
|
Post Reply | Page <12 |
Tweet
|
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |