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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | Re: [gislist] Free GIS Software |
| Date: |
05/04/2005 09:45:01 AM |
| From: |
Peter H. Van Demark |
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Bill:
>Check out http://geocoder.us for an open source geocoder written in Perl.
Free does have its costs! I checked out geocoder.us and noticed that it had
some problems for serious use:
- Locations are based on a straight line from first to last point on the
street segment, and do not take into account the shape points in between.
This can put your locations well away from the proper street segments, even
on adjacent segments.
- Locations are on the centerline of the street segment (when the segment
is straight) and not offset to the even or odd side. That is a problem when
you want to use the locations to determine which areas they are in, such as
Census blocks.
A number of commercial address location engines have the second problem,
which is less serious for some uses, but the first problem really is a
serious deficiency and should be corrected.
Peter
----------------------------------------------------------------
Peter Van Demark
Director of GIS Products and Training Phone: 617-527-4700
Caliper Corporation Fax: 617-527-5113
1172 Beacon Street E-mail: peter@caliper.com
Newton MA 02461-9926 Web site: http://www.caliper.com
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