Re: CaveXML>Range of Fields

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From: Garry Petrie (gp_at_europa.com)
Date: Mon Jan 29 2001 - 17:28:11 CET 

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Date: Mon, 29 Jan 2001 08:28:11 -0800
From: Garry Petrie <gp_at_europa.com>
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Subject: Re: CaveXML>Range of Fields
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Ralph Hartley wrote:

>
> The same sort of issue occurs with compasses as well. Declination, the
> correction between magnetic and true north, varies from place to place
> and from time to time. The variation is vary slow, however. The date of
> the survey and some (approximate) geolocation of the cave should suffice.

Date is essential data. You want to be able to match photographs or gps readings, both of
which already have date information, with your survey data.

Geographic locations, as accurate as possible is also essential. I also worry about the
spread of locations and I had a friend unwittingly pass out dozen of waypoints I had
recorded in a semi-public domain. However, land owners, professionals (geologist,
biologist) and land managers expect real locations. This is their expectation when using
products such has ArcInfo. How else does one investigate a system spread over hundreds of
square miles? If you really are worried about a sensitive cave, DO NOT SURVEY IT, DO NOT
PUBLISH A MAP, DO NOT PHOTOGRAPH IT. Pretty simple, eh?

Garry Petrie

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