Hazard by mesh block — flood, bushfire, erosion, slope within 1 km (by gnaf_id)
/v1/properties/{gnaf_id}/mesh-blocks/hazard20¢ per callIs it exposed to flood, fire or erosion? For every mesh block around the property: whether the block sits inside flood planning, flood overlay, bushfire-prone or erosion-prone areas, risk scores for flood, fire, coast and ground movement, and the slope of its homes. A flag is null where we do not hold that layer for the state (bushfire: Queensland; flood planning: NSW; flood overlay: Queensland), so null means unknown, not clear.
One entry per mesh block within 1,000 m of the property under mesh_blocks, nearest first, each with its mb_code, distance_m, population and dwellings. Blocks across suburb lines are included. Values only — the polygons come from /properties/{gnaf_id}/context/mesh-blocks.
Every field carries provenance — measured (at this block), measured_wider_area (measured for the SA1 or postcode and repeated on every block in it), estimate (our model) or not_recorded (not labelled yet) — plus how, one sentence on how the number was arrived at (empty when not_recorded).
Authorization
Request
The only values you send. Fields under Responses below are what comes back — you never pass those.
Path parameters
gnaf_idstringrequiredQuery parameters
Responses
Successful Response
gnaf_idstringalways returnedThe property, as given.
suburbstringmay be nullThe property's suburb (SAL). Blocks across suburb lines are included.
statestringmay be nullState / Territory abbreviation of the property.
radius_mintegeralways returnedRadius around the property, in metres (1,000).
topicstringalways returnedWhich topic this answers.
questionstringalways returnedThe question this topic answers.
betabooleanalways returned`true` when the figures behind this topic have not been validated against an independent source yet.
beta_noticestringmay be nullWhat is unvalidated, on beta topics only.
block_countintegeralways returnedHow many mesh blocks are in `mesh_blocks`.
mesh_blocksarray of PropertyMbTopicBlockalways returnedOne entry per mesh block within `radius_m`, nearest first.
notestringalways returnedHow to read `provenance`.
About this data
What this is
Natural hazards around one address, block by block: for each mesh block within 1 km, whether it sits inside flood planning, flood overlay, bushfire-prone or erosion-prone areas, risk scores for flood, fire, coast and ground movement, and the slope of its homes.
What people use it for
- Buyers: check whether the streets around a home are exposed, not just the lot itself.
- Insurers and lenders: a neighbourhood view of hazard around a site.
- Developers: an early screen before ordering formal reports.
Coverage
Mesh blocks nationwide (about 368,000). The 1 km radius crosses suburb lines. A field is null where we hold nothing for that block.
Tips
Some flags are held only for some states (bushfire-prone and flood overlay: Queensland; flood planning: NSW). Elsewhere they are null, which means unknown, not clear. For the property's own lot use /v1/properties/{gnaf_id}/risks/all. Check provenance before quoting a field. Whole suburb: /v1/suburbs/{suburb_name}/mesh-blocks/hazard. Polygons: /v1/properties/{gnaf_id}/context/mesh-blocks, joined on mb_code.
/v1/properties/{gnaf_id}/mesh-blocks/hazardcurl --request GET \
--url 'https://api.microburbs.com.au/v1/properties/GANSW704074813/mesh-blocks/hazard' \
--header 'Authorization: Bearer test'{
"data": {
"gnaf_id": "GANSW704074813",
"suburb": "Belmont North",
"state": "NSW",
"radius_m": 1000,
"topic": "hazard",
"question": "Is it exposed to flood, fire or erosion?",
"beta": false,
"block_count": 102,
"mesh_blocks": [
{
"mb_code": "10434270000",
"population": 124,
"dwellings": 46,
"fields": {
"in_flood_planning_area": {
"value": 0,
"unit": "1 = yes, 0 = no",
"measured_at": "mesh_block",
"label": "Inside a flood planning area (NSW)",
"provenance": "measured",
"how": "measured at this level"
},
"in_flood_overlay_qld": {
"unit": "1 = yes, 0 = no",
"measured_at": "mesh_block",
"label": "Inside a flood overlay (QLD)",
"provenance": "measured",
"how": "measured at this level"
},
"in_bushfire_prone_area": {
"unit": "1 = yes, 0 = no",
"measured_at": "mesh_block",
"label": "Inside a bushfire-prone area",
"provenance": "measured",
"how": "measured at this level"
},
"in_erosion_prone_area": {
"value": 0,
"unit": "1 = yes, 0 = no",
"measured_at": "mesh_block",
"label": "Inside an erosion-prone area",
"provenance": "measured",
"how": "measured at this level"
},
"flood_risk_score": {
"value": 0.15,
"unit": "index 0-1",
"label": "Flood risk score",
"provenance": "not_recorded",
"how": ""
},
"fire_risk_score": {
"value": 0.12,
"unit": "index 0-1",
"label": "Bushfire interface risk score",
"provenance": "not_recorded",
"how": ""
},
"coastal_risk_score": {
"value": 0,
"unit": "index 0-1",
"label": "Coastal risk score",
"provenance": "not_recorded",
"how": ""
},
"subsidence_risk_score": {
"value": 0,
"unit": "index 0-1",
"label": "Ground movement (subsidence) risk score",
"provenance": "not_recorded",
"how": ""
},
"slope_deg": {
"value": 5.26,
"unit": "degrees",
"label": "Average slope of the homes on this block",
"provenance": "not_recorded",
"how": ""
}
},
"distance_m": 0
},
{
"mb_code": "10434330000",
"population": 89,
"dwellings": 32,
"fields": {
"in_flood_planning_area": {
"value": 0,
"unit": "1 = yes, 0 = no",
"measured_at": "mesh_block",
"label": "Inside a flood planning area (NSW)",
"provenance": "measured",
"how": "measured at this level"
},
"in_flood_overlay_qld": {
"unit": "1 = yes, 0 = no",
"measured_at": "mesh_block",
"label": "Inside a flood overlay (QLD)",
"provenance": "measured",
"how": "measured at this level"
},
"in_bushfire_prone_area": {
"unit": "1 = yes, 0 = no",
"measured_at": "mesh_block",
"label": "Inside a bushfire-prone area",
"provenance": "measured",
"how": "measured at this level"
},
"in_erosion_prone_area": {
"value": 0,
"unit": "1 = yes, 0 = no",
"measured_at": "mesh_block",
"label": "Inside an erosion-prone area",
"provenance": "measured",
"how": "measured at this level"
},
"flood_risk_score": {
"value": 0.15,
"unit": "index 0-1",
"label": "Flood risk score",
"provenance": "not_recorded",
"how": ""
},
"fire_risk_score": {
"value": 0.12,
"unit": "index 0-1",
"label": "Bushfire interface risk score",
"provenance": "not_recorded",
"how": ""
},
"coastal_risk_score": {
"value": 0,
"unit": "index 0-1",
"label": "Coastal risk score",
"provenance": "not_recorded",
"how": ""
},
"subsidence_risk_score": {
"value": 0,
"unit": "index 0-1",
"label": "Ground movement (subsidence) risk score",
"provenance": "not_recorded",
"how": ""
},
"slope_deg": {
"value": 4.5,
"unit": "degrees",
"label": "Average slope of the homes on this block",
"provenance": "not_recorded",
"how": ""
}
},
"distance_m": 15
},
{
"mb_code": "10434440000",
"population": 99,
"dwellings": 34,
"fields": {
"in_flood_planning_area": {
"value": 0,
"unit": "1 = yes, 0 = no",
"measured_at": "mesh_block",
"label": "Inside a flood planning area (NSW)",
"provenance": "measured",
"how": "measured at this level"
},
"in_flood_overlay_qld": {
"unit": "1 = yes, 0 = no",
"measured_at": "mesh_block",
"label": "Inside a flood overlay (QLD)",
"provenance": "measured",
"how": "measured at this level"
},
"in_bushfire_prone_area": {
"unit": "1 = yes, 0 = no",
"measured_at": "mesh_block",
"label": "Inside a bushfire-prone area",
"provenance": "measured",
"how": "measured at this level"
},
"in_erosion_prone_area": {
"value": 0,
"unit": "1 = yes, 0 = no",
"measured_at": "mesh_block",
"label": "Inside an erosion-prone area",
"provenance": "measured",
"how": "measured at this level"
},
"flood_risk_score": {
"value": 0.16,
"unit": "index 0-1",
"label": "Flood risk score",
"provenance": "not_recorded",
"how": ""
},
"fire_risk_score": {
"value": 0.13,
"unit": "index 0-1",
"label": "Bushfire interface risk score",
"provenance": "not_recorded",
"how": ""
},
"coastal_risk_score": {
"value": 0,
"unit": "index 0-1",
"label": "Coastal risk score",
"provenance": "not_recorded",
"how": ""
},
"subsidence_risk_score": {
"value": 0,
"unit": "index 0-1",
"label": "Ground movement (subsidence) risk score",
"provenance": "not_recorded",
"how": ""
},
"slope_deg": {
"value": 3.93,
"unit": "degrees",
"label": "Average slope of the homes on this block",
"provenance": "not_recorded",
"how": ""
}
},
"distance_m": 56
}
],
"note": "Each field says how its number was arrived at. An estimate is not a measurement, and a figure measured for a wider area is not a measurement of the block."
}
}