shrug-l: Ground Cover Density

[Jordan, Jack]

Keith:

 

Imagine is the software I would apply, if I had input data worthy of its
expense (such as standard/level-1G imagery...but free imagery of the sort
intended for simple browsing or GIS backdrop is rarely going to meet the
basic specs for further processing) and was intending to put out a
sophisticated product such as a multispectral classification to USGS Level II
or III (for classification to further levels of detail you will likely be in
the territory of more expensive hyperspectral imagery and/or stereo/LIDAR
fusion and probably using ENVI or IDL software).  But if a simple vegetation
index product (NDVI, SAVI, etc.) will suffice, and your input data meets the
basic specs for generating it (red band, near-infrared band, the
geocorrection and if necessary the mosaic-making/tiling already done), it can
be generated with much cheaper software, to say prepare a final plot with two
or three legend colors for your choice of vegetation index thresholds (such
as non-vegetated, sparsely-vegetated, thickly-vegetated)...however, the
drawback to such a simple (and cheap) approach is the ambiguity it holds for
the case of water-bodies overgrown with aquatic vegetation or flooded swamp
forest (that situation can be solved to some extent if you use Imagine and
one of the input imagery types that contains an additional thermal-infrared
band).  

 

 

Jack Jordan

FL-DEP-BMMR

 

PS-though your intended purpose may or may not involve security applications,
cant help but think of the three chain-gang convicts from the movie O Brother
Where Art Thou, legging it through levels 1 and 2 of ground cover density,
but taking a long detour around level 3.

 

 

  _____  

From: shrug-l-bounces at lists.dep.state.fl.us
[mailto:shrug-l-bounces at lists.dep.state.fl.us] On Behalf Of Jeffrey Reed
Sent: Thursday, June 25, 2009 3:31 PM
To: Tripp Corbin; Sandell, Keith M.; shrug-l at lists.dep.state.fl.us
Subject: Re: shrug-l: Ground Cover Density

 

Erdas Imagine has a sub-pixel analysis extention that will give you coverage
percentages of any certain pixel.

 

 

	----- Original Message ----- 

	From: Tripp Corbin <mailto:tcorbin at keckwood.com>  

	To: Sandell, Keith M. <mailto:sandell.keith at mail.dc.state.fl.us>  ;
shrug-l at lists.dep.state.fl.us 

	Sent: Thursday, June 25, 2009 2:25 PM

	Subject: RE: shrug-l: Ground Cover Density

	 

	Most of your raster analysis packages will do this. I  am not
familiar with any free ones but you might want to look at Spatial Analyst
Extension for ArcGIS, ErMapper, or Erdas Imagine. 

	 

	Tripp Corbin, MCP, CFM, GISP
	Vice President, GIS/IT
	ESRI Authorized Instructor
	Keck & Wood, Inc. <http://www.keckwood.com/> 
	(678) 417-4013
	(678) 417-8785 fax

	 

	From: shrug-l-bounces at lists.dep.state.fl.us
[mailto:shrug-l-bounces at lists.dep.state.fl.us] On Behalf Of Sandell, Keith M.
	Sent: Thursday, June 25, 2009 2:51 PM
	To: shrug-l at lists.dep.state.fl.us
	Subject: shrug-l: Ground Cover Density

	 

	Hey Shruggers,

	 

	Does anyone know if there are currently any products, free or fee,
that have the capacity to create approximations of ground cover density. Say
in a forest area you would like to know how densely populated it is with
tress, plants, and other types of naturally occurring green stuff.

	 

	Thanks/

	 

	Keith Sandell, MBA

	Correctional Services Assistant Consultant

	Bureau of Probation and Parole Field Services

	Office of Community Corrections

	Florida Department of Corrections

	2601 Blairstone Road

	Tallahassee, Florida 32399

	Phone: (850) 410-3045

	Fax: (850) 487-4427

	 

	 

	This electronic message may contain protected health record/care
information intended for addressee(s) only. Unauthorized release or
disclosure may violate state and/or federal laws.

	 

	
  _____  


	



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