Appraise Properties provides a rich set of map overlays sourced from federal agencies, local GIS servers, and internal application data. Overlays are organized into three tiers: built-in data layers that ship with the platform, federal/platform layers curated from government ArcGIS services, and application layers driven by your organization’s data.
These layers are always available and can be toggled from the layer switcher. They load data dynamically based on the current map viewport.
Property Value Rendering Vector polygons (ArcGIS REST, bbox strategy) Source Local county GIS servers (cascading provider with fallback) Max Features 2,500 per extent (LRU eviction to 1,500) Extent TTL 10 minutes
Fields returned:
Field Description OBJECTIDArcGIS object identifier PIDParcel identification number QuickRefIDQuick reference identifier Geometry Parcel polygon boundary
Styling: Blue outline with light fill. Selected parcels use a darker blue fill with thicker stroke. Hover state shows orange outline.
Property Value Rendering Vector polygons (ArcGIS REST, bbox strategy) Source FEMA National Flood Hazard Layer (NFHL) Provider Federal Emergency Management Agency (FEMA) Max Features 2,000 Geometry Resolution ~1 meter (maxAllowableOffset=0.00001) Zoom Range 10 - 20
Fields returned:
Field Description FLD_ZONEFlood zone classification (A, AE, AH, AO, AR, A99, D, X, V, VE) ZONE_SUBTYZone subtype (0.2 PCT, 1 PCT DRAINAGE, FLOODWAY, FUTURE, REDUCED, LEVEE) DFIRM_IDDigital Flood Insurance Rate Map identifier FLD_AR_IDFlood area identifier Geometry Flood zone polygon boundary
Zone styling (official FEMA colors):
Zone Color Risk Level Regulatory Floodway Red Highest risk — regulatory floodway Zone A / AE / AH / AO / AR / A99 Cyan 1% annual chance flood (100-year) Zone V / VE Dark Blue Coastal high hazard Zone X (0.2%) Orange 0.2% annual chance (500-year) Zone X (Future/Levee) Gray Reduced risk behind levee Zone D Yellow Undetermined hazard Zone X (Unshaded) Light Gray Minimal flood risk
Filter: Minimal-risk zones (Zone X unshaded) are excluded by default to reduce noise.
Soils data is available in two forms: a map layer showing soil polygons and a tabular analysis with detailed soil properties for a specific area.
Property Value Rendering Vector polygons (OGC WFS 1.0.0, bbox strategy) Source USDA NRCS Soil Data Mart WFS Provider USDA Natural Resources Conservation Service Feature Type mapunitpolyextendedResponse Format GML2 (parsed to GeoJSON client-side) Max Features 500
Fields returned:
Field Description musymMap unit symbol munameMap unit / soil series name mukeyMap unit key (unique identifier) drclassdcdDominant drainage class hydgrpdcdHydrologic group slopegradwtaWeighted average slope gradient flodfreqdcdDominant flooding frequency aws050wtaAvailable water storage (0-50cm) Geometry Soil polygon boundary
Styling: Color-coded by drainage class on a green-to-red spectrum (well drained = green, poorly drained = red).
Property Value Rendering Table in Soils panel tab Source USDA SDM Tabular REST Query Type T-SQL with WKT polygon geometry
Fields returned:
Field Description mukeyMap unit key munameSoil series name farmlandClassClassification (e.g., “Prime farmland”, “Farmland of statewide importance”) acresAcres within the query polygon percentagePercentage of total area capabilityClassLand capability class (I - VIII) drainageClassDrainage classification nccpiValueNational Commodity Crop Productivity Index (0 - 1)
Fields returned:
Field Description FULLCODEFull land use classification code LUCODELand use code ADVERSEAdverse influence indicator FACTORAdjustment factor CRPEXPYRCRP contract expiration year Shape_AreaPolygon area Geometry Land use polygon boundary
Land use code styling:
Code Land Use Color 1100Primary Site Red 2100Dry Land Crop Light Yellow 2CRP100Conservation Reserve Program (CRP) Gold 3100Residual Purple 3F100Flood Irrigated Cyan 3S100Sprinkler Irrigated Turquoise 4100Tame Grass Light Green 4RB100Riparian Buffer Dark Green 5100Native Grass Green 6100Sand Pit Brown 7100Rock Quarry Dark Brown W100Wasteland Gray
Property Value Rendering Raster WMS tiles Source USDA NASS CropScape WMS Provider USDA National Agricultural Statistics Service Resolution 30 meters per pixel Projection EPSG:4326 (WGS84) Update Frequency Annual Tile Format PNG with transparency Opacity 70%
CropScape provides per-pixel crop type classification across the continental US. The raster layer renders as a WMS overlay, while tabular statistics are available in the CropScape panel tab.
Tabular query endpoint: https://nassgeodata.gmu.edu/axis2/services/CDLService/GetCDLStat
Coordinates are projected to Albers Equal Area Conic (EPSG:5070) before querying. The response is CSV format with columns: Category, CDL Value, Pixel Count, Acreage.
Common crop codes:
CDL Value Crop Type Color 1 Corn Yellow 5 Soybeans Dark Green 24 Winter Wheat Tan 36 Alfalfa Gold 37 Other Hay/Non-Alfalfa Light Green 176 Grassland/Pasture Tan 141 - 143 Forest Types Green 121 - 124 Developed / Urban Gray - Red 83 Water Dark Blue 87 Wetlands Light Blue
The platform includes 60+ curated federal government layers stored in the database and rendered dynamically. These layers are sourced from public ArcGIS REST services operated by federal agencies. Up to 10 can be enabled simultaneously.
Layers are rendered based on their type:
ArcGIS MapServer — Raster tiles via TileArcGISRestArcGIS FeatureServer — Vector features via EsriJSON queriesWMS — OGC Web Map Service raster tilesMVT — Mapbox Vector Tiles
Layer Source Type Description FEMA National Flood Hazard Layer (NFHL) FEMA MapServer ArcGIS MapServer Official digital flood hazard data — Special Flood Hazard Areas, flood zones, floodways, and base flood elevations
Layer Source Type Description EPA Cleanup Sites EPA FeatureServer ArcGIS FeatureServer Superfund, RCRA corrective action, and brownfield cleanup sites EPA Brownfield Grant Jurisdictions EPA FeatureServer ArcGIS FeatureServer Areas receiving Brownfield Assessment, Cleanup, and Revolving Loan Fund grants EPA RCRA Hazardous Waste Facilities EPA FeatureServer ArcGIS FeatureServer Facilities regulated under RCRA for hazardous waste management EPA NPDES Major Dischargers EPA FeatureServer ArcGIS FeatureServer Major facilities with NPDES water discharge permits EPA Superfund Site Boundaries EPA FeatureServer ArcGIS FeatureServer National Priorities List (NPL) Superfund site boundaries EPA Underground Storage Tanks EPA FeatureServer ArcGIS FeatureServer Active or closed underground storage tanks regulated under RCRA Subtitle I
Layer Source Type Description NOAA Tornado Damage Points NOAA FeatureServer ArcGIS FeatureServer Post-storm damage assessment points from NWS tornado damage surveys NOAA Tornado Damage Paths NOAA FeatureServer ArcGIS FeatureServer Tornado damage path polygons from NWS damage assessment toolkit
Over 30 layers from the USFS Enterprise Data Warehouse , all rendered as ArcGIS MapServer raster tiles.
Layer Service Description USFS Surface Ownership EDW/EDW_SurfaceOwnership_01Federal, state, local, and private land ownership parcels USFS Basic Ownership EDW/EDW_BasicOwnership_01Simplified NFS land ownership boundaries NFS Boundaries EDW/EDW_ForestSystemBoundaries_01Administrative boundaries of National Forests, Grasslands, and NFS units Proclaimed Forest Boundaries EDW/EDW_ProclaimedForestBoundaries_01Boundaries established by Presidential proclamation or act of Congress Ranger Districts EDW/EDW_RangerDistricts_01Administrative Ranger District boundaries National Grasslands EDW/EDW_NationalGrassland_01National Grassland boundaries Tribal Indian Lands EDW/EDW_TribalIndianLands_01Tribal and Indian land boundaries relative to the NFS Land Management Planning EDW/EDW_LandManagementPlanning_01Forest plan management area boundaries and designations
Layer Service Description Wilderness Areas EDW/EDW_Wilderness_01Congressionally designated Wilderness areas Wild & Scenic Rivers EDW/EDW_WildScenicRiver_01Designated Wild and Scenic River corridors Inventoried Roadless Areas (2001) EDW/EDW_InventoriedRoadlessAreas2001_01Roadless areas per the 2001 Roadless Area Conservation Rule PADUS Protected Areas EDW/EDW_PADUS_01Comprehensive inventory of US protected lands Watersheds EDW/EDW_Watersheds_01Hydrologic unit boundaries (HUC) and priority watersheds Fire Occurrence & Perimeters EDW/EDW_FireOccurrenceAndPerimeter_01Historical fire occurrence points and perimeters MTBS Burn Severity EDW/EDW_MTBS_01Burn severity for all large US fires since 1984 RAVG Burn Severity EDW/EDW_RAVG_v2_01Satellite-derived rapid assessment burn severity Hazardous Fuels Treatments EDW/EDW_HazardousFuelsTreatments_01Prescribed burns, mechanical treatments, and fuels reduction areas Burned Area Emergency Response EDW/EDW_BurnedAreaEmergencyResponse_01Post-fire emergency stabilization treatment areas Fireshed Registry EDW/EDW_FireshedRegistry_01Fireshed boundaries for wildfire risk analysis Wildland-Urban Interface (2020) EDW/EDW_WUI_2020_01Where human development meets wildland vegetation Ecomap 2025 EDW/EDW_Ecomap2025_01Ecological classification (domains, divisions, provinces, sections) Insect & Disease Survey EDW/EDW_InsectandDiseaseSurvey_01Aerial survey data for forest areas impacted by insects/diseases Special Status Areas EDW/EDW_SpecialStatusArea_01Research Natural Areas, Botanical Areas, Geological Areas CERCLA Sites EDW/EDW_CERCLASite_01Superfund (CERCLA) sites on or near NFS lands Forests to Faucets EDW/EDW_ForeststoFaucets_02Importance of forested watersheds for drinking water Community Wildfire Defense Grants EDW/EDW_CommWildfireDefenseGrant_01Communities receiving wildfire defense grant funding
Layer Service Description Timber Harvest EDW/EDW_TimberHarvest_01Completed timber harvest activity areas on NFS lands Range Management EDW/EDW_RangeManagement_01Grazing allotment boundaries and range management areas Silviculture Reforestation EDW/EDW_SilvicultureReforestation_01Reforestation activity areas on NFS lands
Layer Service Description NFS Roads EDW/EDW_RoadBasic_01National Forest road network with road class, surface type, and maintenance level NFS Trails EDW/EDW_TrailNFSPublish_01Trail network with trail class, use types, and accessibility Recreation Sites EDW/EDW_InfraRecreationSites_01Campgrounds, picnic areas, trailheads, and other developed sites Motor Vehicle Use Map EDW/EDW_MVUM_01Roads, trails, and areas designated for motor vehicle use Right of Way EDW/EDW_RightofWay_01Authorized rights-of-way for roads, utilities, and pipelines
Layer Service Description Mineral Rights EDW/EDW_MineralRights_01Mineral rights and subsurface estate ownership on NFS lands
Layer Source Type Description USDA Cropland Data Layer (CDL) USDA NASS WMS WMS National crop-specific land cover classification at 30m resolution. Updated annually. National Land Cover Database (NLCD) USGS MRLC WMS WMS 16 land cover classes (developed, forest, cropland, wetlands, etc.) at 30m resolution
Layer Source Type Description Income Markets by Census Tract (FFIEC) FFIEC FeatureServer ArcGIS FeatureServer Census tract-level median family income relative to MSA/MD median
Layer Source Type Description USGS Mineral Resources Data System USGS FeatureServer ArcGIS FeatureServer Mineral resource locations, mines, and prospects
Layer Source Type Description DOE Regional Clean Hydrogen Hubs DOE/NETL FeatureServer ArcGIS FeatureServer Regional Clean Hydrogen Hub project locations
These layers display data from your organization’s database.
Property Value Rendering Vector markers with animated clustering Source Internal API (/api/properties) Loading Viewport-based with LRU eviction
Shows all properties in the current viewport with clustering at lower zoom levels. Individual markers appear at street-level zoom. Supports filtering by:
Show All — All properties in viewportMy Work — Properties from your active assignmentsRecently Viewed — Properties you recently accessed
Property Value Rendering Vector markers with type-specific colors Source Internal API (type-specific endpoints) Loading Viewport-based with pagination
Four comparable types, each with distinct styling:
Type Endpoint Color Sales /api/salesRed / Burgundy Leases /api/leasesGreen Income & Expense /api/income-expensePurple Cost /api/costOrange
Comparables are gated by the Properties layer — they only display when the Properties overlay is enabled.
Property Value Rendering Vector polygon (GeoJSON) Source boundary column from the properties tableStyling Blue stroke (#3b82f6), 3px width, 15% fill opacity
Displays the saved parcel boundary for the current subject property on detail and form map views.
User-drawn geometry layers for marking up the map:
Annotations — Lines, polygons, rectangles, circles, and text markers with customizable colors, stroke widths, and fill opacity. Can be persisted to the database.Measurements — Distance (line segments) and area (polygon) measurements with configurable units (miles, feet, km, meters). Session-only.
When generating static maps for reports, the system renders a subset of overlays as composited raster images:
Layer Export Support Method Parcels Yes ArcGIS REST vector fetch FEMA Flood Zones Yes ArcGIS REST vector fetch with zone styling Agricultural Land Yes ArcGIS REST vector fetch Soils No Tabular data only (no raster export) Federal Layers (ArcGIS) Yes MapServer/FeatureServer export endpoint Federal Layers (WMS) Yes WMS GetMap request
Overlays are composited onto the base map using the Sharp image processing library.
Platform layers are managed through the Map Layers API:
GET /api/map-layers?limit=50&isPlatform=true
Query parameters:
Parameter Type Description limitnumber Max results (default 50, max 400) searchstring Filter by title, description, category, or provider isPlatformboolean Filter to platform-curated layers categorystring Filter by category
Response fields per layer:
Field Description idUUID nameUnique identifier (e.g., fema:nfhl-national) titleDisplay name descriptionMarkdown description layerTypeARCGIS_MAPSERVER, WMS, MVT, WFS, VECTOR, RASTERcategoryGrouping category sourceProviderProvider name (EPA, FEMA, USGS, etc.) sourceUrlPrimary ArcGIS REST endpoint externalTileUrlTile rendering URL externalLayerIdWMS layer name (for WMS type) minZoom / maxZoomZoom level constraints styleCustom styling configuration (JSON) geometryTypePoint, LineString, Polygon, etc.
