Mayotte - Chido cyclone

This parent metadata sheet groups together the various data layers linked to the assessment of damage to the buildings in Mayotte following the passage of cyclone Chido on December 14, 20204, which is being carried out in OpenStreetMap by volunteer contributors using post-disaster Pleiade imagery. For more information on the methodology employed, see these blog posts:

https://leslibresgeographes.org/cartographie-osm-des-dommages-du-bati-a-mayotte-apres-chido/

https://leslibresgeographes.org/cartographie-osm-des-dommages-du-bati-a-mayotte-apres-chido-nouveaux-indicateurs-et-premiers-resultats/


These layers, all freely accessible and downloadable, are as follows:

- layers named with an emsr780_ prefix, based on data retrieved from https://rapidmapping.emergency.copernicus.eu/EMSR780, which represent the assessment areas used as polygons, and the building damage assessment carried out by EMSR Copernicus for Chido in December 2024 as points .

- polygon layers named with a hotosm_[project id] prefix, representing the grid of tasks to be mapped on the various projects uploaded to the HOT Tasking Manager for building damage assessment in OSM

- 4 polygon layers named with a Mayotte_Pleiades_202412 polygon prefix, which represent the visible areas of the post-disaster Pleiades imagery, and a polygon layer named Mayotte_Pleiades_20241217to20_bounds_clouds_SeverinGeo, which is the cross-reference and represents, on the contrary, the areas that are still covered by clouds on the 4 imageries, and therefore inexploitable for the assessment.

- the osm_en_building_damage_copernicus polygon layer, which represents OSM buildings with the damage assessment carried out by OSM contributors, and which incorporates a semantic cross-reference with the Copernicus EMSR780 assessment. It is updated continuously, at intervals of a few minutes from the OSM database.

- the yt_osm_en_admin_boundary_admin_level_8_communes_stats layer, which uses polygons to represent the boundaries of Mayotte's 17 communes, with a statistical summary of OSM and EMSR780 building damage assessments, their cross-referencing, the total number of buildings, the total number of buildings usable for assessment (because not covered by clouds), the number of buildings yet to be assessed, and the percentage of buildings already assessed (among those that can be assessed). It is updated every hour.


For OSM layers other than Chido (all those with names beginning with osm_), also listed in the WFS section below, see https://ifl2.francophonelibre.org/geonetwork/srv/fre/catalog.search#/metadata/10825532-981c-4bf7-900e-bd1b6a6bb19a


To visualize data, use the links below to the MapStore map or to map views (in EN or FR versions). Some indicators are also presented in a dashboard (EN or FR version).


There are two ways to download the data:

- either the entire territory in one of the formats available via the WFS point “OSM EN and FR Chido and thematic layers for the entire territory” below

- or on a part of the territory to be drawn yourself or to be chosen within the administrative boundaries of the territory in question, using the maps or MapStore view. Demonstration videos are available here: https://llg-collabora.ethibox.fr/s/owY8DQTQpgDr8sw


Currently, GEOPACKAGE FORMAT IS NOT FUNCTIONAL (the resulting layers are empty): prefer geojson format to retrieve all field names and convert them to geopackage from QGIS.

Simple

Date (Publication)
Presentation form
Digital map
Status
On going
Point of contact
Organisation name Individual name Electronic mail address Role

Les Libres Géographes

Séverin Ménard

contact.ifl@leslibresgeographes.org

Custodian
Maintenance and update frequency
Continual
Keywords

  • LLg
Place

  • Les Libres Géographes

  • OSM

  • OpenStreetMap

  • open data

  • Mayotte

  • YT

GEMET

  • Africa

  • agroforestry

  • agricultural building

  • agriculture

  • airport

  • agroindustry

  • energy supply

  • agricultural management

  • surface water

  • agricultural economics

  • temperate forest

  • thermal power plant

  • agriculture and cattle industry

  • waste sorting unit

  • agricultural exploitation

  • access road

  • marsh

  • tertiary sector

  • agricultural landscape

  • telecommunications

  • administration

  • territory

  • terrestrial area

  • abandoned industrial site

  • agricultural land

  • administrative jurisdiction

  • building damage

  • Copernicus

  • EMSR

  • Chido

  • TC-2024-000225-COM

INSPIRE themes

  • Habitats and biotopes

  • Meteorological geographical features

  • Hydrography

  • Land cover

  • Administrative units

  • Geographical names

  • Transport networks

  • Production and industrial facilities

  • Geographical grid systems

  • Land use

  • Buildings

  • Utility and governmental services

  • Human health and safety

  • Agricultural and aquaculture facilities

  • building damage

  • Copernicus

  • EMSR

  • Chido

  • TC-2024-000225-COM
Access constraints
License
Use constraints
License
Other constraints

ODbL License - map data © OpenStreetMap contributors
Spatial representation type
Vector
Denominator
5000
Language
Français
Character set
UTF8
Topic category
  • Boundaries
  • Farming
  • Economy
  • Environment
  • Health
  • Imagery base maps earth cover
  • Inland waters
  • Location
  • Society
  • Structure
  • Transportation
  • Utilities communication
N
S
E
W
thumbnail


Reference system identifier
EPSG3857
Distribution format
Name Version

gpkg

shp

dxf

json

csv

xls

kml
OnLine resource
Protocol Linkage Name
OGC:WFS-1.0.0-http-get-capabilities https://ifl2.francophonelibre.org/geoserver/OSM_YT/wfs?SERVICE=WFS

Chido et OSM EN and FR thematic layers for the whole territory

WWW:LINK-1.0-http--link

 		https://ifl2.francophonelibre.org/mapstore/#/context/OSM_latest_crisis_LLg/1598#/context/OSM_latest_crisis_LLg/1598

MapStore map containing the main Chido layers
https://ifl2.francophonelibre.org/mapstore/#/context/OSM_latest_crisis_LLg/1136

MapStore map views showing the history of building damage assessments — FR version
https://ifl2.francophonelibre.org/mapstore/#/context/OSM_latest_crisis_LLg/1080

MapStore map views showing the history of building damage assessments — EN version

WWW:LINK-1.0-http--link

 		https://ifl2.francophonelibre.org/mapstore/#/dashboard/1549

MapStore dashboard showing several building damage assessment indicators - FR version
https://ifl2.francophonelibre.org/mapstore/#/dashboard/1037

MapStore dashboard showing several building damage assessment indicators - EN version
Hierarchy level
Dataset

Metadata

File identifier
8aad3842-8903-4658-b4d1-81e07c634b5f XML
Metadata language
Français
Character set
UTF8
Date stamp
2025-07-16T10:11:25.673254094Z
Metadata standard name

ISO 19115:2003/19139
Metadata standard version

1.0
Metadata author
Organisation name Individual name Electronic mail address Role

Les Libres Géographes

Séverin Ménard

contact.ifl@leslibresgeographes.org

Point of contact
Other language
Language Character encoding
English UTF8
French UTF8
 
 

Overviews

overview
Mayotte_chido_piecharts.png

Spatial extent

N
S
E
W
thumbnail


Keywords

GEMET
Africa Chido Copernicus EMSR TC-2024-000225-COM abandoned industrial site access road administration administrative jurisdiction agricultural building agricultural economics agricultural exploitation agricultural land agricultural landscape agricultural management agriculture agriculture and cattle industry agroforestry agroindustry airport building damage energy supply marsh surface water telecommunications temperate forest terrestrial area territory tertiary sector thermal power plant waste sorting unit
INSPIRE themes
Administrative units Agricultural and aquaculture facilities Buildings Chido Copernicus EMSR Geographical grid systems Geographical names Habitats and biotopes Human health and safety Hydrography Land cover Land use Meteorological geographical features Production and industrial facilities TC-2024-000225-COM Transport networks Utility and governmental services building damage

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Associated resources

Not available