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| GeoCommunity Mailing List |
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| Subject: | [gislist] Preparing Maps |
| Date: |
12/14/2005 08:50:01 PM |
| From: |
DickBoyd .. aol.com |
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Today (12/14/05), we had a presentation that highlighted a single fire
district (one of several in the county) at our fire safe council meeting. There were
a series of maps with different overlays. The legend included several symbols
that were not on the maps. The presenter explained that these symbols were on
the legend because they appeared somewhere in the county. The only way to get
the data with the desired data, he explained, was to prepare a map for the
entire county and then take that county wide map and select the area to be
displayed from that larger map.
The time and cost estimates for preparing the maps seemed excessive to me.
Is there a way to prepare a map with the desired attributes by specifying the
coordinates for coverage instead of "cutting" and "pasting" from a larger
map? Is it faster and cheaper to limit the sort earlier in the process?
The map locating grid was latitude and longitude. Could the map have been
prepared more quickly by sorting for the data elements of interest within
geographic limits and then preparing the map? The geographic coordinates would have
gone beyond the borders of the fire districts and would have included data of
interest in the neighboring districts. The borders of the fire district would
have been one set of data.
The way the data was presented also suggested there may be an anomaly between
the coordinates. The fire district seems to be defined by range and township.
The anomaly is that about five acres seems to be "orphaned" by a lake.
Another factor was audience response. Even though the presenter explained
that the map was prepared for a specific audience to answer a specific set of
questions, most of the discussion was regarding what the map was saying in the
context of the viewers point of view and how the map could be prepared to answer
their questions.
What is the experience of the members of gislists regarding public
participation in map presentations in briefings intended for a very specific audience?
What is the experience of the members of gislists in establishing data
elements to be used in a metafile? Think beyond FIPS items. How would you describe
water storage available for firefighting? Capacity? Hookups? Reliability?
Accessibility? Load carrying ability of approach roads?
What has been the experience in siting of new fire stations? Center of
gravity models? Are the models weighted on travel time or travel distance?
What has been your experience in identifying funds for GIS work to support
fire safe councils?
Thankfully we had a very good chairman who was able to keep the discussion on
topic.
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