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Subject:
USGS Topos - Blue Line Stream Designations
From:
Maps-L <[log in to unmask]>
Reply To:
Maps, Air Photo & Geospatial Systems Forum
Date:
Wed, 30 May 2007 08:18:01 -0500
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-------- Original Message --------
Subject:        USGS Topos - Blue Line Stream Designations
Date:   Tue, 29 May 2007 14:20:43 -0700
From:   A'Hearn, William <[log in to unmask]>
To:     <[log in to unmask]>


Does anyone know what is (was?) the criteria used by USGS to delineate a "BLUE-LINE" stream on USGS topo maps?  We have searched through USGS's website and Googled it to no avail.

-- Bill A'Hearn

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Bill A'Hearn, LSIT
GIS Analyst/Mapping Specialist
PW Engineering
Mapping & GIS Services
City of Glendale, CA
[log in to unmask]

Latitude: 34º 8' 48"N - Longitude: 118º 14' 49"W - Elev: 565'

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"The good cartographer is both a scientist and an artist.  He must have a thorough knowledge of his subject and model, the Earth.... He must have the ability to generalize intelligently and to make a right selection of the features to show. These are represented by means of lines or colors; and the effective use of lines or colors requires more than knowledge of the subject - it requires artistic judgment."   Erwin Josephus Raisz (1893-1968)

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