Site topography, delivered as CAD
Hudson Valley Topo turns a KMZ outline into a layered CAD package in your state plane zone, built from the latest USGS lidar, FEMA and NRCS data. A typical site is ready in about two minutes.
A KMZ or KML polygon from Google Earth or your GIS. You see acreage and the elevation grid that will be used before anything runs.
The DEM is fetched, smoothed and traced into 1 ft contours. Flood zones, soils and parcels are pulled live and clipped to the site.
Contours, flood zones, soils and parcels draw over streets or aerial imagery. Click any polygon for its attributes.
A layered DXF for AutoCAD or Civil 3D, plus a GeoPackage for QGIS and ArcGIS with the same layers.
Three of the four layers are read live from the authoritative federal services at run time, so every package reflects the current release rather than a file someone downloaded last year.
USGS 3D Elevation Program (3DEP), national 1 m lidar-derived DEM
Fetched for the buffered site, converted to US survey feet and smoothed with a one-cell circular mean before contouring at 1 ft, with majors every 5 ft.
FEMA National Flood Hazard Layer, Flood Hazard Zones
Special flood hazard areas (A, AE, AH, AO, V, VE) and the 0.2 percent annual chance shaded X areas, each on its own DXF layer with zone, subtype, SFHA flag and static BFE as attributes.
NRCS SSURGO via Soil Data Access, the service behind Web Soil Survey
Map unit polygons intersecting the site, labelled with the map unit symbol and carrying the full map unit name and key. Always the current SSURGO release.
State and county parcel fabric for each covered market
Parcel outlines labelled with the local parcel identifier, with address and county stored as attributes on each polygon.
New York. NYS Tax Parcels Public: 38 of 62 counties, including Ulster, Orange, Putnam, Greene, Sullivan, Rockland, Westchester, Albany and Rensselaer. Dutchess, Columbia, Saratoga and Schenectady do not yet release parcels to the state.
Texas Panhandle (test area). Potter and Randall appraisal district parcels, staged locally.
Everything is delivered in NAD83 state plane, US survey feet, in the zone for the site (NAD83 / New York Central (ftUS); NAD83 / New York East (ftUS); NAD83 / New York Long Island (ftUS); NAD83 / New York West (ftUS); NAD83 / Texas North (ftUS)), ready to insert into a project drawing without transformation.
| DXF layer | Contents |
|---|---|
BOUNDARY / BOUNDS | Site outline and its bounding rectangle |
C-TOPO-MAJR / C-TOPO-MINR | Contours as polylines with elevation set, 5 ft majors and 1 ft minors |
C-TOPO-TEXT | Elevation labels on major contours |
FLOOD-AE, FLOOD-X, … | One layer per FEMA zone, labelled with zone and subtype |
SOILS / SOILS-TEXT | SSURGO map units labelled with symbol, name in attributes |
PARCELS / PARCELS-TEXT | Parcels labelled with the local parcel ID, address and county in attributes |
Hudson Valley Topo