We
also offer on our data catalog a shapefile, which is an index to the topo maps
and indicates the date (year) for the map published.
Yes
the USGS maps will have slight shifts between them due to the fact that they had
to be manually georeferenced.
Furthermore, even maps where the alignment between one layer (such as
roads) is high, another layer (such as contours) may be low due to the fact that
those old maps were printed one color at a time using (I believe) engraved metal
plates. The plates did not always line up exactly between
printings.
===============================
Michael Smith
State GIS
Manager, Maine Office of GIS
State of Maine, Office of Information
Technology
michael.smith _at_ maine.gov
207-215-5530
Board Member,
Maine GeoLibrary
Board Member, Maine GIS Users Group
State Rep, National
States Geographic Information Council
State House Station 174
264
Civic Center Drive
Augusta, ME 04333-0174
69o 47'
49.5"W 44o 20' 54.5"N
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Hey, thanks Dan.
I knew they existed off the
MeGIS site and have been available from UNH for quite some time as I've gone
there several times over the years. Mostly I was curious if the individual map's
publication date could be had without going there (or to the USGS site).
For any other users on this list that use historic quads, the USGS site
may have in some cases several copies of the same addition map for you to choose
from and that the geo-referenced pdf is equally serviceable and easily read into
the application (in my case, Global Mapper), though note a minimal shift in
position between each of them.
Below are examples (sorry for the overly
compressed jpgs) of the MeGIS WMS version, and three USGS geo-referenced pdfs
all of the exact same area (circa 1911) and with other data layers visible for
positional referencing.
V. Kelly
Bellis, PLS 2099 - 17 Union Street - Ellsworth, ME 04605
[log in to unmask] - 207.667.6912 -
Horizon Surveying Co.
On 2/1/2012 8:45 AM, Daniel H Walters
wrote:
[log in to unmask]
type="cite">
Kelly ...... The maps as
published and georeferenced can be downloaded from the USGS map locator at the
USGS Map Store. Here is the link...... Dan
http://store.usgs.gov/b2c_usgs/usgs/maplocator/(ctype=areaDetails&carea=%24ROOT&layout=6_1_61_48&uiarea=2)/.do
Dan Walters
Geospatial Liaison for ME,
MA & RI
USGS NSDI Partnership Office
196 Whitten Road
Augusta,
Maine 04330
207-776-1293
[log in to unmask]
The historic quads are a fantastic WMS
addition - hats off, kudos and many thanks! Well done.
I may have
missed something; however, where can we view the unclipped versions as the map
collars contain other information which pertains to each individual 15' quad
and the presented
metadata is general in
nature?
V. Kelly Bellis, PLS 2099 - 17
Union Street - Ellsworth, ME 04605
[log in to unmask] -
207.667.6912 - Horizon Surveying Co.
On 1/23/2012
2:10 PM, Kirouac, David wrote:
CEMETERIES have been ADDED to the MEGIS internet Data Catalog, http://www.maine.gov/megis/catalog. Please refer to the metadata for
additional information.
USGS 15' topo maps circa 1910 and USGS 15'
topo maps circa 1945 are 2 NEW WMS services of historic USGS topos.
Please refer to the metadata for additional information.
Public Drinking Water Surface Supply Watersheds
(DIRSHED) has been UPDATED in the MEGIS internet Data Catalog, http://www.maine.gov/megis/catalog. DIRSHED depicts watershed areas of
surface waters that are active sources of Maine public water supplies,
depicted at 1:24000 scale. Please refer to the metadata for additional
information.
PARCELS (MEGIS.Parcels) have
been UPDATED in the MEGIS internet Data Catalog, http://www.maine.gov/megis/catalog.
PARCELS for the following towns have been ADDED:
Caribou, Easton, Fort Fairfield,
Houlton, Limestone, Mars Hill, New Sweden, Perham, Wade, Washburn, Westfield,
Addison, Baileyville, Beals, Beddington, Calais, Charlotte, Cherryfield,
Columbia, Columbia Falls, Cooper, Crawford, Cutler, Danforth, Deblois,
Dennysville, East Machias, Eastport, Harrington, Jonesboro, Jonesport, Lubec,
Machias, Machiasport, Marshfield, Meddybemps, Milbridge, Northfield, Pembroke,
Perry, Princeton, Robbinston, Roque Bluffs, Steuben, Topsfield, Vanceboro,
Waite, Wesley, and Whitneyville.
PARCELS for the following towns have been
UPDATED:
Castle Hill, Chapman,
Harpswell, Mapleton, Presque Isle, Whiting, Woodland, and Yarmouth.
David Kirouac
Sr
Programmer Analyst, Maine Office of GIS
State of Maine, Office of Information Technology
207-215-6936
http://megis.maine.gov
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