Elevation 5 Foot Contours

Abstract

This data set represents five foot elevation contours that were digitized from USGS 1:24,000 Topographic Maps. The majority of the line intervals are five feet, however, there are some ten-foot intervals. Some areas were originally in meters and converted to feet. Bathymetric contours are present in some coastal areas.

Contours are lines that represent the same elevation on the surface of the land. The contours represented on the 1:24,000 Topographic Maps are referenced to mean sea level.

The contours are sourced from maps that are over 20 years and up to 50+ years old. Urban areas may have significant changes in contours. This data should be used as a general guide to elevation.

LIDAR is now available in many areas of Florida, especially coastal and high population areas, which provides much more current and higher resolution data.

Purpose

Display land elevation contours. Analysis of elevation.

Time Period of Content

• Beginning date: 1950s
• Ending date: 1980s

Publish Date

2006-09-17

Originator

USGS, Florida Water Management Districts, Florida Department of Environmental Protection

Publisher

Florida Department of Environmental Protection

Theme Keywords

elevation, contours

Place Keywords

Florida

Source Scale

1:24,000

Horizontal Accuracy

Estimated to meet 1:24,000 National Map Accuracy Standards (+/- 40 feet)

Vertical Accuracy

Estimated to be one half of a contour, or +/- 2.5 feet.

Process Steps

The five foot contour data was digitized from USGS 1:24,000 Topographic Maps by the Florida Water Management Districts and the Florida Department of Environmental Protection.

The general steps taken to digitize the contours was:

1. Scan topography mylar separates.
2. Register the scans to corresponding quadrangles.
3. Clean up the scans.
4. Convert the scans to vector format.
5. Clean up the vector linework.
6. Assign attribute codes.
7. Quality assure the data.

Format

Shapefile

Format Details

Line

Projection

Albers Florida HARN

Field Names

CONTOUR = Elevation contour value (Double)

UNIT = Elevation units - all values are FT (Text)

FEATURECO = Feature code. (Integer)

FEATURE = Feature description (Text)

CONTOURLA = Elevation contour value - negative values are bathymetric contours (Integer)

Distribution Info

http://geodata.dep.state.fl.us/

http://publicfiles.dep.state.fl.us/OTIS/GIS/data/land_surface_elevation_24.zip

Data License

Public Domain

Image Samples

Data at Scale