re: image analysis: mapping individuals
Simon,
you've asked multiple questions in your post. the short answer is that there is no easy
automated approach to your problem that i know of. it comes down to old fashioned aerial
photo interp. there is a tool that works with ArcGIS called "Hawth's Tools"
that can be downloaded for free. I believe it can help you extract X,Ys for points.
But, you'll have to place the points. For the imagery you have that is already
geometrically corrected and georeferenced, the X,Ys can be extracted easily. For those
that are oblique or simply lack a georeference, there is considerably more work involved.
luckily, geometric correction and georeferencing are automated tasks in most GIS
software. if you have terrain data and there is considerable relief, you will probably
want to orthorectify your images prior to locating your points. but all that is
dependent on your question and the spatial accuracy/ precision necessary for your study.
good luck.
Ray
On Sun, 29 Nov 2009, ECOLOG-L automatic digest system wrote:
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ECOLOG-L DIGEST - 27 NOV 2009 TO 28 NOV 2009 (#2009-329)
Table of contents:
* Research tech on drought mortality in New Mexico
* image analysis: mapping individuals
1. Research tech on drought mortality in New Mexico
+ Re: Research tech on drought mortality in New Mexico (11/28)
From: Wayne Tyson <[email protected]>
2. image analysis: mapping individuals
+ image analysis: mapping individuals (11/28)
From: Simon Queenborough <[email protected]>
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