Precision Mapping

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The United States GPS system was the first GNSS system available to consumers. Recently, many additional GNSS systems have gone live globally (GLONASS, QZSS, Beidou, Galileo, etc.), and many devices use multiple GNSS systems at the same time to improve coverage and accuracy.

GPS Accuracy: A well-designed GPS receiver can achieve a horizontal accuracy of 3 meters or better and vertical accuracy of 5 meters or better 95% of the time. Augmented GPS systems can provide sub-meter accuracy.

GPS Differential Correction: GPS receivers improve accuracy using two receivers because ground-based receivers can take accurate measurements of the error. As long as the stationary GPS receiver detects the same satellite signals as your GPS receiver, it can send you correction data based on its precisely surveyed location.

This augmented system broadcasts the corrected error in real-time along with the GPS signal. [source]

Read more on this topic and how it relates to Tallahassee - Leon County GIS by reviewing the information below.


 

image of a mobile app

Mobile

Mobile applications that help support functionality across devices. Learn More»

 

aerial image of Bobby Bowden Stadium

Imagery

High-resolution aerial imagery that enables you to see the world from multiple perspectives. Learn More»

 

image of team with printable maps

Topographic Data

Surface shapes and features of land surfaces. Learn More»

 

image of team with printable maps

Planimetric Data

Maps that show only the horizontal position of features on the Earths' surface. Learn More»

Mobile

Imagery

All data products conform to guidelines and standards specified in the Florida County Option Orthoimagery Program Standards, 2018, USGS Lidar Base Specification 11-B4, ASPRS Positional Accuracy Standards for Geospatial Data, and Florida Statues, Chapter 472.

Topographic Data

All topographic data products were collected and/or derived from a high-precision Lidar survey. All data products conform to guidelines and standards specified in the Florida County Option Orthoimagery Program Standards, 2018, USGS Lidar Base Specification 11-B4, ASPRS Positional Accuracy Standards for Geospatial Data, and Florida Statues, Chapter 472.

Planimetric Data

All of the planimetric data except for the hydrography is updated to reflect changes over a 3-year periods. All data products conform to guidelines and standards specified in the Florida County Option Orthoimagery Program Standards, 2018, USGS Lidar Base Specification 11-B4, ASPRS Positional Accuracy Standards for Geospatial Data, and Florida Statues, Chapter 472.