GIS Mapping Resource Linker

Quick access to federal land mapping and data sites.

Every land deal starts with understanding the dirt. These three federal mapping tools give you instant access to soil data, flood zones, and topographic surveys — the foundation of any serious land analysis.

Soil Maps (NRCS)

Web Soil Survey

Access the USDA Natural Resources Conservation Service Web Soil Survey to explore soil types, drainage characteristics, land capability classifications, and more. Essential for evaluating agricultural potential and building suitability.

Soil type identificationDrainage classificationLand capability ratingsAgricultural suitability
Open Soil Maps

FEMA Flood Maps

Flood Map Service Center

Search the Federal Emergency Management Agency's official flood hazard maps. Determine flood zones, base flood elevations, and floodway boundaries for any property in the United States.

Flood zone determinationBase flood elevationFloodway boundariesInsurance rate maps
Open FEMA Flood Maps

Topo Maps (USGS)

National Map Viewer

Explore the U.S. Geological Survey's National Map for topographic data, elevation contours, hydrography, and geographic features. Download high-resolution topo maps for any area in the country.

Elevation contoursHydrography dataGeographic featuresDownloadable topo maps
Open Topo Maps

Additional Mapping Resources

Google Earth Pro

Free satellite imagery with measurement tools, historical imagery, and 3D terrain. Download at google.com/earth.

County GIS Portals

Most counties maintain their own GIS systems with parcel data, zoning maps, and tax information. Search '[county name] GIS' to find yours.

AcreValue

Free parcel-level data including land values, soil productivity, and ownership information for agricultural land.

USGS Earth Explorer

Access aerial photography, satellite imagery, and elevation data from the USGS archive.

Practical Example: Evaluating a 40-Acre Parcel

A land broker in Florida is evaluating a 40-acre parcel for a client interested in building a hunting cabin. Here's the workflow:

  • • Step 1 — County GIS: Confirm parcel boundaries, zoning (agricultural/residential), and current ownership.
  • • Step 2 — FEMA Flood Maps: Check flood zone designation. The northern 10 acres fall in Zone AE (high risk) — cabin must be built on the southern portion.
  • • Step 3 — NRCS Soil Survey: Verify soil drainage class for septic suitability. Sandy loam on the south side passes the perc test.
  • • Step 4 — USGS Topo: Confirm elevation and access road grade. The building site sits 8 ft above the flood plain.

Total research time: 20 minutes. The broker presents a complete site analysis to the client, demonstrating professional due diligence and earning the listing.

Pro Tip: When analyzing a parcel, always cross-reference at least two data sources. Start with the county GIS for parcel boundaries, then layer in FEMA flood data, NRCS soil maps, and USGS topo data for a complete picture of the land's characteristics and potential constraints.

Frequently Asked Questions

What GIS maps do land brokers need?

Land brokers commonly use NRCS soil surveys for agricultural potential, FEMA flood maps for flood zone determination, USGS topographic maps for terrain analysis, and county parcel viewers for ownership and boundary information.

How do I check if a property is in a flood zone?

Use FEMA's National Flood Hazard Layer (NFHL) viewer at msc.fema.gov to search any address and see its flood zone designation, base flood elevation, and whether flood insurance is required.

What is the NRCS Web Soil Survey?

The NRCS Web Soil Survey is a free USDA tool that provides detailed soil data for any location in the US, including soil type, drainage class, land capability, and suitability for agriculture, septic systems, and construction.

Part of the Land Broker Toolkit — free tools for land professionals.

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