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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | Re: [gislist] Free GIS Software |
| Date: |
05/04/2005 09:45:02 AM |
| From: |
Tripp C. Corbin |
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It goes to "you get what you pay for"
Charles C. (Tripp) Corbin III, GISP, MCP
Associate Vice President, GIS/Mapping
ESRI Authorized Instructor
Keck & Wood, Inc.
www.keckwood.com
(678) 417-4013
(678) 417-8785 fax
Keck & Wood now offers Introduction to ArcGIS/ArcView training classes.
Contact me for more information.
Currently scheduled classes:
Introduction to ArcGIS I - May 19-20
Introduction to ArcGIS II - May 23-25
-----Original Message-----
From: Peter H. Van Demark [mailto:peter@caliper.com]
Sent: Wednesday, May 04, 2005 10:40 AM
To: gislist@lists.thinkburst.com
Subject: Re: [gislist] Free GIS Software
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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