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Grid size comparisons – DeLorme Topo North America 9.0 User Manual

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DeLorme Topo North America Help

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USGS Quads (3DTQ) — 12-14
Color contour topographic maps produced by the United States Geological Survey.

Downloaded using the NetLink tab.

o

Aerial Imagery (DOQQ) — 15-16
Black and white 1-meter resolution digital aerial photography. Downloaded using

the NetLink tab.

o

Color Aerial Imagery (DOQQ) — 13-17
True-color 1-meter resolution digital aerial photography. Downloaded using the

NetLink tab.

o

1:50K Canada Topographic Map Sheets — 10-15
Coverage for most of Canada. Can overlay other maps. These maps are made

from original Canadian map sheets and are a combination of Toporama maps,

photomaps, and scanned maps. They include not only topographic contour lines

and water but also significant buildings, historic sites, and other man-made

features in urban areas. Downloaded using the NetLink tab.

o

NOAA Nautical Charts (varies)
Color bathymetric nautical charts produced by the National Oceanic and

Atmospheric Administration (NOAA). Downloaded using the NetLink tab.

o

USGS Hi-resolution 133 City Imagery — 13-17
Color aerial imagery over the country's largest metropolitan areas with a

resolution of approximately 1/3 meter (or about 1 foot).

• Click Use Defaults to return the slider controls to their default minimum and

maximum values.

• Raster imagery (such as USGS Quads, aerial imagery, NOAA nautical charts, and

satellite imagery) includes color-coded data zoom level suggestions under Zoom

Range.

Green indicates the data zoom levels at which the data is best viewed on the

device. The default values are set to only export data zoom levels that are in the

green area.

Red indicates zoom levels at which the data is available but not necessarily the

best viewed.

• Maps with multiple data types have large file sizes. To decrease the file size when

exporting multiple map data types, try exporting raster data with small data zoom

level ranges.

• For information on how data zoom levels display on Earthmate PN-Series GPS

devices, see

Data Zoom Level/Scale Bar Translation

.