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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | Re: [gislist] Multiple shapefile average |
| Date: |
09/21/2007 02:55:00 PM |
| From: |
Pat Waggaman |
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Jesse, not seeing any answers come through, I=B4ll throw out a $245 solutio=
n.
Buy a copy of Manifold V 8. Create a map, import =
all the.shp files. (If there=B4s really a lot of =
files, you may want a 64 byte CPU, and the 64 =
byte Manifold edition for - as I recollect - $50 additional.)
File import can be scripted or done directly =
through the GUI. The attributes will be imported =
into separate DB fields for each layer =
corresponding to a .shp drawing. The Touch =
function can be used through a scripted function =
either to search for overlaps or select =
overlapping objects based upon a series of =
designated points or areas: or with the Spatial =
Overlay in the GUI you can sequentially go =
through your areas of interest (AOIs) and select =
all touching layers. In either case the =
particular DB fields that interest you can be =
configured to create standard statistical COUNT, =
MEDIAN, MEAN etc analysis of the spatially =
determined overlaps in a new drawing.
If you want to push it a bit further that =
statistical analysis can then be copy / pasted =
into EXCEL for the crunching the number of =
touching areas as a percentage of the whole.
Works for fish catches over time. The graphic =
Touch analysis can exported to the Web inputting =
additional layers as they come in: or with a bit =
more serious programming allowing Web users to =
input their own points (or areas) of interest.
Cheers,
Pat
At 11:16 20-09-2007, Jesse Cleary wrote:
>Hi folks
>
>Here's a spatial analysis I can't seem to =
>quickly figure how to approach. I have some shapefiles
>(same attributes, similar locations, but =
>different time slices) that I need to average certain
>attributes from each shapefile where they intersect spatially.
>
>Intersecting them in ArcGIS hasn't worked since =
>no single location has values throughout the entire
>shapefile series (several thousand files).
>
>I guess I need an alternative geoprocesing =
>function that allows empty timeslices in my series to get
>through. Or some spatial statistic function =
>that can take many files as input and calc basic stats
>from each file's attributes.
>
>Any suggestions? Feeling like there must be =
>some easy answer that I'm not able to find. Thanks!
>
>
>Jesse
>
>
>
>
>--
>Jesse A. Cleary
>Department of Marine Sciences
>UNC Chapel Hill
>
>334 Chapman Hall
>(919) 962-4987
>jcleary@email.unc.edu
>
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