Ground elevation
Select a location and run the source check.
BaseMark Site Explorer
Land in perspective.
Find a location. Read the landscape.
01 / Find a place
Find your location.
Enter a street address with city and state or ZIP, a town and state, or latitude, longitude. Coverage: contiguous United States.
The example checks a public river landscape near Vancouver, Washington, with floodplain, wetland and protected-land context. Explore nearby habitat and infrastructure using Layers. It is not an available development property.
Go to the map ↓Illustrative area · not a site boundary
Example landscape · Columbia River
Explore project scale.
Select a reference point
Historical solar array area · assumes DC:AC 1.30
Select a reference point to place the illustration.
Published reference area, scaled in proportion to capacity. This does not estimate the land your project requires. Area boundaries differ between technologies.
What these zones plan for
Read the regulation ↗Assumptions and source
Shape and placement are schematic. The circle is centered on your reference point and is not a plant layout or a site-fit assessment. Equal MW does not mean equal energy or land impact.
Loading the landscape. Location search and text checks work independently.
USGS / USDA imagery · Re:Earth / Mapterhorn terrain, CC BY 4.0
Imagery may be several years old. The Key on the map names each circle, line and dot. The solid gold circle is a search-radius guide and the shaded dashed circle is an area illustration. Neither is a property boundary or regulatory buffer.
Outline and measure
Define your site.
Draw an area to check land, water and soil records across its outline. A connection line measures distance only. Neither is a surveyed boundary or verified route.
Select points on the map.
No site outline.
No connection measured.
Import a GeoJSON outline or line
One WGS84 polygon without holes, or one line. Maximum 64 KB, 100 outline vertices or 200 line vertices, within about 62 mi. The file stays on your device; running a source check sends the outline to the selected mapping services.
02 / Set your search
Your selected location.
Choose a place or select a point on the map.
Nearby results describe features that intersect the search area. They do not establish conditions at its center or across a property.
03 / Read the context
Your site snapshot.
No source check has been run. Select a location to begin.
Flood mapping
Waiting for your search.
Wetland mapping
Waiting for your search.
Mapping coverage
Availability is checked separately. It cannot establish complete coverage.
Environmental facility records
Run a source check to inspect this source.
Soils and drainage
Run a source check to inspect this source.
Protected land interests
Run a source check to inspect this source.
Critical habitat
Run a source check to inspect this source.
Mapped rail nearby
Run a source check to find nearby mapped rail segments.
Straight-line distance to mapped track is not a service connection or access right. Yard tracks and sidings are identified by their recorded classification.
Rail freight terminals
Run a source check to find mapped rail freight terminals.
Highways and connectors
Run a source check to inspect this source.
Aviation context
Run a source check to inspect this source.
Principal port areas
Run a source check to inspect this source.
Energy community designation
Run a source check to read the Treasury designation for this location.
EPA brownfield records
Run a source check to inspect this source.
Transmission lines
Run a source check to inspect this source.
Energy context
Nearby generation will appear here.
Recorded facilities describe the surrounding energy landscape. They do not establish available power or a connection for this location.
04 / Take the next step
Your location.
The source record.
An initial look at your location and nearby mapped context. A starting point for a conversation with BaseMark.
Your site snapshot
Keep the search location and source observations together. The download stays on your device.
Preview the notes
Run a source check to prepare your notes.
Start with a conversation. After a source check, this link opens an email preview in your mail application. Nothing is sent by this website.
Sources, coverage and how this works
Public mapping
USGS / USDA National Map supplies imagery. Dates and resolution vary. Re:Earth and Mapterhorn supply terrain under CC BY 4.0, subject to availability.
FEMA supplies National Flood Hazard Layer zones and separate study-availability boundaries. Effective dates, amendments and local studies require separate review.
USFWS National Wetlands Inventory is biological mapping. It does not determine regulatory jurisdiction or establish absence of wetlands. Coverage and survey dates are not established by this tool.
Land and access records
Soil composition comes from USDA NRCS Soil Data Access. EPA ECHO supplies environmental facility and program records. Protected interests use USGS PAD-US 4.1; critical habitat uses the USFWS final and proposed line and polygon inventories. These sources do not establish title, jurisdiction or site feasibility.
Transmission lines come from the HIFLD-derived U.S. Electric Power Transmission Lines layer hosted on ArcGIS Online. The layer is archived; its last data update was September 30, 2024. Only lines with a recorded operating voltage are shown. Inactive lines and lines the publisher marks unverified are excluded. Substation locations are not published in this source, so only named line endpoints appear. The optional streets view swaps in USGS Imagery Topo: the same aerial imagery with roads and names from National Map transportation data, based on Census TIGER/Line.
Energy community designations come from Treasury's published lists for IRS Notice 2026-39 (June 10, 2026): counties designated under the statistical area category for 2025 and the cumulative coal closure census tract list. BaseMark self-hosts an extract of those files. The reference point is matched to a 2020 census tract with the Census Bureau TIGERweb service. The brownfield category is site-specific and is not assessed; nearby EPA ACRES brownfield grant records are listed separately from EPA's EnviroMapper service, which publishes no dataset date. A designation does not establish credit eligibility.
FRA, FHWA, FAA, USACE and BTS supply the rail, highway, aviation and port records. Each result retains its own source, date basis and geographic scope. NHS record downloads include the original publisher metadata.
Search and privacy
Address lookup sends the submitted address through BaseMark to the US Census Geocoder for an approximate address-range match. Geographic county and state may differ from the mailing address. Town search uses a reduced, self-hosted GeoNames cities1000 extract, CC BY 4.0, downloaded September 23, 2026. It includes smaller towns but is not a street-address or parcel directory. Initial exploration covers the contiguous United States; data availability varies.
Map providers receive your IP address and the region you view. Source checks send the selected coordinates and radius, or the drawn outline, directly to the mapping providers, including USGS for ground elevation. Land checks also send the point or outline to USGS, USFWS and USDA NRCS. Transportation and transmission checks send the reference point to services hosted by Esri. Energy community checks send it to the Census Bureau TIGERweb service. Brownfield checks send it to EPA. When you turn on emergency planning zones that include an ingestion zone (the station example, or the conventional comparison for the small modular example), a circle around the point is sent to an Esri-hosted USGS land cover service. Ground slope is computed in your browser from the map's terrain. Energy facility records use a self-hosted extract of the EIA 2025 final survey, published September 10, 2026. BaseMark does not save your search or automatically receive the notes. Read our privacy information.
Emergency planning zones
The nuclear project examples can show emergency planning zones around your point. A large station uses the about 10 mi plume and about 50 mi ingestion zones of 10 CFR 50.47(c)(2). A small modular plant may use 10 CFR 50.160, which sizes the plume zone by dose and replaces the fixed ingestion zone with ingestion response planning; its 2 mi ring is illustrative. Land cover inside an ingestion zone comes from USGS Annual NLCD 2024. Real zones are set case by case in each plant's emergency plan.
Viewer foundation adapted from gods-eye-view, with CesiumJS. Source and license notices.