USGS Topographical Mapping

CASANOVA COLLECTION?

U.S. SCIENCE & TECHNOLOGY PROVIDER

Comparing 'All TOPO Maps:V7' & Brand-X Map Images

Obtain High Commercial-Grade Resolution Map Images With V7 Collections.

Below We Present Actual Screen Captured Images Along With Comparisons, Of The V7 Map Image And A Competing Brand Topographical Map Software Image.

USGS Topographical Paper Maps Are Raster Scanned At 250 DPI, By The Publisher Of 'ALL TOPO MAPS:'; Producing A Digital Map Image Of 250DPI (Dots Per Inch). While The Competitor's Digital Scans Are About 112 DPI.

Below Are Actual Screen Captured Map Image Samples. Note The Difference In Resolution And Scan Quality. Remember, The Actual Content Of The Topographical Map Is Up To The USGS.

Note ----- When Navigating By, Plotting By, Using To Produce Images, Map Printing, Map Publishing, Or Using A Digital Map For Basemap Production, It Is Absolutely Important To Have Defined And Clear Pixel Resolution. Below Is The Bottom Line Way To Compare Products.

Actual Screen-Captured Digital Map Image Samples

ALL TOPO MAPS: Images	Competitor Images
1:1 actual pixel size	1:1 actual pixel size
Zoomed In View Of Map Image
	ALL TOPO MAPS 100% 1:1 View Scale notice how clean the contour lines and text appear:
	Competitor Images 200% 2:1 View Scale Notice the compression artifacts (speckles) These speckles come from using a poor graphic data compression process. It Is Always Best To Avoid Compressing Digital Data!
'ALL TOPO MAPS' Maps Are Usable At Greatly Magnification Since They Are Compressed With An Advanced Loss-Less Compression Process. The Competitor's Maps Are Worthless When Zoomed To A Greater Magnification Level. Below Are Actual Screen Captures Directly From Both Programs.
180% Zoomed In View Scale
400% Zoomed In View Scale Note - It Took 400% Zoom To See The Map Image At The Same Map Scale As The 'ALL TOPO MAPS:' Map! The Completive Software Gives A Impressive Sounding 400% Magnification Level...... However..... When Using 'ALL TOPOS MAPS:', The Same Magnification Level Would Only Be 180%..... With Additional Magnification Always Available To 700%!
The Images Above Were Actual Screen Captures From A PC Computer Running Both Map Applications.