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National Oceanic and Atmospheric Administration logo NOAA Shoreline National Oceanic and Atmospheric Administration
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    Historical Medium Resolution Shoreline T-Sheets CUSP National Shoreline ENC to Direct Composite Shoreline ESI Shoreline
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Historical Surveys (T-Sheets)

This data set was featured as base maps to construct nautical charts primarily used for navigation.

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  • Georeferenced T-Sheets
Coverage

Continental U.S., Alaska, Hawaiian Islands, Puerto Rico, and U.S. Virgin Islands.

Source Data

Topographic sheets.

Scanned T-Sheets and Descriptive Reports

There are two survey index maps (Survey Index 1 and Survey Index 2) that can be used to identify scanned T-Sheets and descriptive reports.

Tidal Datum

Mean high water and mean lower low water

Scale

Variable; 1:1,000 to 1:3,000,000

Spatial Reference

Geographic coordinate system; horizontal datum – North American Datum of 1983 (NAD83).

Accuracy

These data are advertised to meet or exceed current National Map Accuracy Standards when plotted as a hard-copy product to the appropriate source chart scale. However, in compiling this derived product, the developers made no attempt to ascertain the congruence between the charted data and the real world.

Process Description

Generation of the vector shoreline product involved the conversion of the source data into a digital vector image. The raw vector image was then converted into a GIS coverage where the vector was corrected for gross errors, topologies were constructed, descriptive information added, and an intermediate archive created. The chart cover data were then partitioned into regionally contiguous groupings (referred to as sections). Adjacent boundaries were matched, and the individual charts are joined together to produce continuous shoreline segments. The data was then verified by comparing random segments of vector shoreline with the chart master sheets (mylars). Discrepancies were noted and corrective action taken. The data was then re-verified. All data was then archived.

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