Hi Aaron,
Well, the bad news is that this is on the trickier end of the GIS spectrum.
It depends on the exact nature of the conversion you want to perform when
changing to polygon.
http://gis.stackexchange.com/questions/23203/how-to-calculate-raster-statistics-for-polygons
http://www.qgistutorials.com/en/docs/sampling_raster_data.html
Should hopefully get you started though.
Cheers,
Jonathan
From: qgis-user-boun...@lists.osgeo.org
[mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Aaron Stoler
Sent: Monday, February 23, 2015 8:42 PM
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] pixel counts
Hi all,
I am brand new to QGIS and have pretty minimal GIS experience, so I apologize
for my crude terminology. I was recently handed a large number of ARCInfo files
(adf) containing information on species abundance at 30 m2 resolution. Each
file (well...group of files since they are adf files) describes the abundance
of a single species. I would like to analyze single species density within a
custom-defined polygon. Species abundance within a 30 m2 is defined by color
intensity (black = 0 abundance, white = max abundance).
I have figured out how to view single adf files as raster layers in QGIS. From
there, it seems like I should be able to generate a polygon and tell the
program to analyze pixel count for each level of color intensity.
I haven't had much GIS training, but I would really like to conduct an
experiment that needs this data. Could someone please point me in the right
direction?
Thank you for your time,
Aaron
absto...@gmail.com<mailto:absto...@gmail.com>
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