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| Subject: | Re: [gislist] "summarize by" question |
| Date: |
05/04/2005 11:00:02 AM |
| From: |
GISex* Technologies |
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>
> If your parcels were perfectly square and lined up with the grid cells,
> you would get the same answers for area. Long, narrow, curvy polygons
> have more deviations from the square grid cell model, and therefore have
> a greater difference in area. If you need a "closer fit" in area
> calculations, you can make your grid cells smaller.
>
> Good Luck,
> dt
>
> -----Original Message-----
> From: gislist-bounces@lists.geocomm.com
> [mailto:gislist-bounces@lists.geocomm.com] On Behalf Of Julia Reisemann
> Sent: Tuesday, April 26, 2005 11:02 AM
> To: "GIS List (E-mail)" slist
> Subject: [gislist] "summarize by" question
>
> I have a question regarding the Summarize by in ArcView. I noticed that
> a summarize by on a shapefile gives me higher numbers than summarizing
> the same data as a grid (can be a much as 5%). The file is a parcel
> file, the grid to summarize on has 30m gridcells. Does anybody know,
> why ArcView does this? I assume there is a difference in the algorithm
> or the problem of having a shapely parcel file in contrast to a straight
> forward grid. Would be great, if anybody really knows what is going on.
>
> Thanks,
>
> Julia
>
>
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