INTRODUCING OUR AWARD WINING Authoritative US Topos and GeoChange - PowerPoint PPT Presentation

INTRODUCING OUR AWARD WINING Authoritative US Topos and GeoChange Maps Developed by The W. E. Upjohn Center for the Study of Geographical Change Western Michigan University and honored by The International Map Industry Association (IMIA): Best Digital Map Product - Gold Award: Authoritative US Topo & GeoChange Maps Overall Americas All-Category Winner: Authoritative US Topo & GeoChange Maps Presented at the IMIA (Americas) Map Conference on September 10, 2013, held in Cambridge, Mass .

What are Authoritative US Topos and GeoChange Maps?  Authoritative US Topos digital maps are produced from scans of the entire database of US topographic maps.  Digitized maps are geo-referenced and processed for color consistency.  Authoritative US Topos are the basis of our GeoChange map product, paired with recent NAIP aerial imagery, and producing a stand-alone reference.

What makes our product unique?  Authoritative US Topos and GeoChange maps are produced using our unique digitization process designed to produce GIS data from conventional maps.  All quads (the same paper maps used in the production of DRGs) are scanned in high resolution at 500 dpi then processed to 250 dpi without losing digital quality.  Our 1:24,000 scale digital topos line up impeccably with 1:12,000 scale imagery, largely due to USGS field surveying and quality standards.

What are some of the ways our Authoritative US Topos differ from USGS DRGs? DRG Authoritative US Topo Authoritative US Topos show sharp, clear definition of text and features.

What are some of the ways our Authoritative US Topos differ from USGS DRGs? Authoritative US Topo DRG Authoritative US Topos maintain clear and distinct contour line detail.

What are some of the ways our Authoritative US Topos differ from USGS DRGs? Authoritative US Topo DRG High resolution Authoritative US Topos maintain distinction in features. Here the individual symbols for a vineyard are clearly visible.

What are some of the ways our Authoritative US Topos differ from USGS DRGs? DRG Authoritative US Topo With Authoritative US Topos, features such as rivers, streams, and rapids are more clearly defined.

What are some of the ways our Authoritative US Topos differ from USGS DRGs? Authoritative US Topo DRG Authoritative US Topos provide clear, consistent, and well-defined contours.

What are some of the ways our Authoritative US Topos differ from USGS DRGs? DRG Authoritative US Topo Authoritative US Topos ensure contour lines remain separate and distinct, and are visible across borders.

What are some of the ways our Authoritative Topos differ from USGS DRGs? DRG Authoritative US Topo Authoritative US Topos provide consistent color and definition with no fading.

How do we produce our GeoChange Maps? Authoritative US Topo Aerial Imagery = + Transparent Authoritative US Topos are then overlaid on aerial imagery from the National Agriculture Imagery Program (NAIP) rendering the combined GeoChange map seen on the following slide.

How do we produce our GeoChange Maps? GeoChange maps give a clear and accurate picture of geographical change in specific areas for use in planning and research. =

What are the advantages of maps and imagery together? Tracing and Tracking Geographical Change Glacial Movement AuthoritativeUS Topo Aerial Imagery GeoChange Glacial Movement -Glacier National Park Ahern Pass, MT (48 45N, 113 45W) Map date 1968, Aerial Photo date 2012 Contour Interval = 80 feet Minor movement of glaciers in this region

What are the advantages of maps and imagery together? Tracing and Tracking Geographical Change Land Cover Change Authoritative US Topo Aerial Imagery GeoChange Land Cover Change -Upper Peninsula Michigan Mining Country Silver City, MI (46 45N, 89 30W) Map date 1943, Aerial Photo date 2012 Contour Interval = 20 feet Forest and upper crust removal

What are the advantages of maps and imagery together? Tracing and Tracking Geographical Change Urban Implosion Authoritative US Topo Aerial Imagery GeoChange Urban Implosion Flint, MI (43N, 83W) Map date 1967, Aerial Photo date 2010 Contour Interval = 5 feet

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