Circular direction of the dominant surface gradient, clockwise from north
Circular direction of the dominant surface gradient, clockwise from north. The service evaluates a circular 1,000 metre neighborhood around one coordinate and returns standardized units across all 30 covered countries.
1000 (raw units)
price
1
calls / 30d
1
unique payers
2026-09-03
updated
Provider
euroland.halowerk.com · discovered, not yet claimed by its owner
Payment (x402 accepts[])
[
{
"scheme": "exact",
"network": "eip155:8453",
"payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "1000",
"maxTimeoutSeconds": 300
}
]Output schema
{
"bazaar": {
"info": {
"input": {
"body": {
"latitude": 51.9,
"longitude": 7.1
},
"bodyType": "json",
"method": "POST",
"type": "http"
},
"output": {
"example": {
"authoritative_status": "preliminary_non_binding",
"category": "europe-wide",
"caveats": [
"Preliminary geodata assessment; not a legally binding property, cadastral, planning, environmental or title search.",
"Raster resolution and model uncertainty can be larger than the submitted site geometry.",
"Material decisions require a current verification by the competent national or regional authority."
],
"charged": true,
"checked_at": "2026-09-03T00:00:00.000Z",
"confidence": 0.85,
"confidence_method": "Conservative minimum source-family baseline plus a bounded sample-count bonus; multi-source results receive a fixed integration penalty.",
"data_date": "2015-12-31T23:59:59.000Z",
"evidence": {
"aspect": {
"method": "documented source raster sample",
"metric": "aspect",
"name": "Dominant aspect",
"sample_count": 1,
"unit": "degree",
"value": 1
}
},
"evidence_classification": "derived_from_open_geodata",
"facts": {
"measurements": {
"aspect": {
"method": "documented source raster sample",
"metric": "aspect",
"name": "Dominant aspect",
"sample_count": 1,
"unit": "degree",
"value": 1
}
}
},
"generated_at": "2026-09-03T00:00:00.000Z",
"geometry": null,
"limitations": [
"Preliminary geodata assessment; not a legally binding property, cadastral, planning, environmental or title search.",
"Raster resolution and model uncertainty can be larger than the submitted site geometry.",
"Material decisions require a current verification by the competent national or regional authority."
],
"payment": {
"price_usdc": 0.001,
"settled": true
},
"recommended_next_steps": [
"Verify material findings with current cadastral, planning and environmental records from the competent authority.",
"Commission a qualified on-site survey where parcel-scale conditions affect the decision."
],
"result": "measurement_available",
"risk_level": "not_applicable",
"service": "europe-aspect-buffer-1000m",
"service_id": "eli-0766",
"sources": [
{
"attribution": "© DLR e.V. 2010-2014 and © Airbus Defence and Space GmbH 2014-2018 provided under COPERNICUS by the European Union and ESA; all rights reserved.",
"authority": "European Union Copernicus Programme / ESA / DLR / Airbus",
"cache_policy": "HTTP byte ranges only; bounded 2 GB derived block cache, no whole-dataset copy.",
"caveats": [
"Digital surface model: vegetation and structures can raise the measured surface above bare earth.",
"Values over water and source voids may be unavailable."
],
"commercial_use": true,
"commercial_use_allowed": true,
"coverage": "Global land surface; requests are restricted to the 30 published European countries.",
"data_date": "2015-12-31T23:59:59.000Z",
"data_period": "TanDEM-X acquisition period 2011-2015; this is not a current-condition survey.",
"dataset": "Copernicus DEM GLO-30 Full, Free & Open",
"freshness": "Pinned COP-DEM-GLO-30-F product.",
"id": "copernicus-dem-glo30-f",
"license": "COP-DEM-GLO-30-F Full, Free & Open licence",
"license_status": "verified",
"license_verified_at": "2026-09-03",
"name": "Copernicus DEM GLO-30 Full, Free & Open",
"provider": "European Union Copernicus Programme / ESA / DLR / Airbus",
"purpose": "Surface elevation and deterministic terrain derivatives.",
"rate_limit": "AWS Open Data endpoint; local per-request timeout and circuit breaker apply.",
"redistribution": true,
"resolution": "30 metres",
"retrieved_at": "2026-09-03T00:00:00.000Z",
"source_url": "https://copernicus-dem-30m.s3.eu-central-1.amazonaws.com/",
"terms_url": "https://dataspace.copernicus.eu/sites/default/files/media/files/2025-06/copernicus_contributing_mission_data_access_v2_cop_dem_licenses.pdf",
"update_interval": "Provider product release based.",
"url": "https://copernicus-dem-30m.s3.eu-central-1.amazonaws.com/",
"version": "COP-DEM-GLO-30-F"
}
],
"status": "success",
"summary": "Europe Dominant aspect: 1,000 m buffer: source-backed screening evidence was calculated successfully."
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"latitude": {
"description": "WGS84 latitude inside the published European coverage.",
"maximum": 72.5,
"minimum": 34,
"type": "number"
},
"longitude": {
"description": "WGS84 longitude inside the published European coverage.",
"maximum": 40.5,
"minimum": -31.5,
"type": "number"
}
},
"required": [
"longitude",
"latitude"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"additionalProperties": false,
"properties": {
"authoritative_status": {
"const": "preliminary_non_binding",
"type": "string"
},
"category": {
"const": "europe-wide",
"type": "string"
},
"caveats": {
"items": {
"type": "string"
},
"type": "array"
},
"charged": {
"type": "boolean"
},
"checked_at": {
"type": "string"
},
"confidence": {
"maximum": 1,
"minimum": 0,
"type": "number"
},
"confidence_method": {
"minLength": 20,
"type": "string"
},
"data_date": {
"type": [
"string",
"null"
]
},
"evidence": {
"additionalProperties": false,
"properties": {
"aspect": {
"additionalProperties": true,
"properties": {
"method": {
"type": "string"
},
"metric": {
"type": "string"
},
"name": {
"type": "string"
},
"sample_count": {
"minimum": 1,
"type": "integer"
},
"unit": {
"type": "string"
},
"value": {
"type": "number"
}
},
"required": [
"metric",
"name",
"unit",
"value",
"sample_count",
"method"
],
"type": "object"
}
},
"required": [
"aspect"
],
"type": "object"
},
"evidence_classification": {
"const": "derived_from_open_geodata",
"type": "string"
},
"facts": {
"type": "object"
},
"generated_at": {
"type": "string"
},
"geometry": {
"type": [
"object",
"null"
]
},
"limitations": {
"items": {
"type": "string"
},
"minItems": 1,
"type": "array"
},
"meta": {
"type": "object"
},
"payment": {
"additionalProperties": true,
"required": [
"settled",
"price_usdc"
],
"type": "object"
},
"recommended_next_steps": {
"items": {
"type": "string"
},
"minItems": 1,
"type": "array"
},
"result": {
"minLength": 1,
"type": "string"
},
"risk_level": {
"type": "string"
},
"service": {
"const": "europe-aspect-buffer-1000m",
"type": "string"
},
"service_id": {
"const": "eli-0766",
"type": "string"
},
"sources": {
"items": {
"additionalProperties": true,
"properties": {
"authority": {
"type": "string"
},
"dataset": {
"type": "string"
},
"license": {
"type": "string"
},
"retrieved_at": {
"type": "string"
},
"url": {
"type": "string"
}
},
"required": [
"authority",
"dataset",
"url",
"license",
"retrieved_at"
],
"type": "object"
},
"minItems": 1,
"type": "array"
},
"status": {
"enum": [
"success",
"no_finding",
"warning",
"high_risk",
"not_applicable",
"insufficient_coverage",
"source_temporarily_unavailable"
],
"type": "string"
},
"summary": {
"minLength": 20,
"type": "string"
}
},
"required": [
"service_id",
"service",
"category",
"status",
"result",
"summary",
"facts",
"geometry",
"risk_level",
"confidence",
"confidence_method",
"checked_at",
"data_date",
"evidence",
"sources",
"limitations",
"recommended_next_steps",
"evidence_classification",
"authoritative_status",
"generated_at",
"caveats",
"charged",
"payment"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
},
"payment-identifier": {
"info": {
"required": false
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"id": {
"maxLength": 128,
"minLength": 16,
"pattern": "^[a-zA-Z0-9_-]+$",
"type": "string"
},
"required": {
"type": "boolean"
}
},
"required": [
"required"
],
"type": "object"
}
}
}Use it
curl
curl "https://euroland.halowerk.com/v1/europe-aspect-buffer-1000m" # -> 402 Payment Required, accepts[] lists how to pay # retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid
JavaScript
const res = await fetch("https://euroland.halowerk.com/v1/europe-aspect-buffer-1000m");
if (res.status === 402) {
const { accepts } = await res.json();
// pay one of accepts[] via an x402 client, then retry with the payment header
}Python
import httpx
res = httpx.get("https://euroland.halowerk.com/v1/europe-aspect-buffer-1000m")
if res.status_code == 402:
accepts = res.json()["accepts"]
# pay one of accepts[] via an x402 client, then retry with the payment headerMachine-readable
Everything on this page is also available as clean JSON at /resources/9014.json, and this resource appears in /discovery/resources and /discovery/search.