[Taxacom] odometer georeferencing

Frederick W. Schueler bckcdb at istar.ca
Mon Feb 7 12:57:46 CST 2011

On 2/7/2011 1:18 PM, Tom Schweich wrote:

> My area of expertise is fairly narrow, being mostly a user of ESRI's
> ArcGIS.  However, in that particular GIS application, you should be able
> to start with a base map, add streets from the ArcGIS data DVD or some
> other source, and from the streets create a route feature that follows
> the route of the collector.  The route feature can be calibrated in
> miles or whatever units the collector's odometer used.  You can also
> enter odometer resets if necessary. Then, assuming the collector
> actually did use their odometer and it was accurate (!) you would be
> able to locate the collection along the route and determine the location
> in latitude and longitude.

* the thing we're trying to do here is to transfer as much of the work 
from the GIS operator to me as the observer and data entrist, and 
especially to take advantage of the many cases where we've got reference 
points on both sides of the observation, so I'll be assigning the 
co-ordinates as those falling at the recorded proportion of the distance 
between reference points, and can use these to calibrate the odometer of 
a vehicle for places where there's only one reference point.

It will be interesting to see how well this works (e.g. how many 
recorded stands of Typha angustifolia are still there, and how well the 
locations match with later GPS co-ordinates), and how much work is 
entailed in working them out.

fred schueler
          Frederick W. Schueler & Aleta Karstad
Bishops Mills Natural History Centre - http://pinicola.ca/bmnhc.htm
now in the field on the Thirty Years Later Expedition -
Daily Paintings - http://karstaddailypaintings.blogspot.com/
     RR#2 Bishops Mills, Ontario, Canada K0G 1T0
   on the Smiths Falls Limestone Plain 44* 52'N 75* 42'W
    (613)258-3107 <bckcdb at istar.ca> http://pinicola.ca/

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