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            <gco:CharacterString xmlns:gco="http://www.isotc211.org/2005/gco">The vector grid system provides a spatial and statistical infrastructure that allows the integration of environmental and socio-economic data. Its exploitation allows the crossing of different spatial data within the same grid units. Project results obtained using this grid system can be more easily linked. 

This grid system forms the geographic and statistical infrastructure of the [Southern Quebec Land Accounts] (https://statistique.quebec.ca/fr/document/comptes-des-terres-du-quebec-meridional-regions-administratives-et-provinces-naturelles) of the Institut de la Statistique du Québec (ISQ). It forms the geospatial and statistical context for the development of ecosystem accounting in Quebec. 

**In order to improve the vector grid system and the Land Accounts of Southern Quebec and to better anticipate the future needs of users, we would like to be informed of their use (field of application, objectives of use, territory, association with other products, etc.). You can write to us at maxime.keith@stat.gouv.qc.ca **. 

This grid system allows the spatial integration of various data relating, for example, to human populations, the economy or the characteristics of land. The ISQ wishes to encourage the use of this system in projects that require the integration of several data sources, the analysis of this data at different spatial scales and the monitoring of this data over time. The fixed geographic references of the grids simplify the compilation of statistics according to different territorial divisions and facilitate the monitoring of changes over time. In particular, the grid system promotes the consistency of data at the provincial level. 

The spatial intersection of the grid and the spatial data layer to be integrated makes it possible to transfer the information underlying the layer within each cell of the grid. In the case of the Southern Quebec Land Accounts, the spatial intersection of the grid and each of the three land cover layers (1990s, 2000s and 2010s) made it possible to report the dominant coverage within each grid cell. The set of [matrix files of Southern Quebec Land Accounts] (https://www.donneesquebec.ca/recherche/fr/dataset/comptes-des-terres-du-quebec-meridional-changement-de-la-couverture-terrestre) is the result of this intersection. 

**Features: **
The product includes two vector grids: one made up of cells of 1 km² (or 1,000 m on a side), which covers all of Quebec, and another of 2,500 m² cells (or 50 m on a side, i.e. a quarter of a hectare), which fits perfectly into the first and covers Quebec territory located south of the 52nd parallel. Note that the nomenclature of this system, designed according to a Cartesian plan, was developed so that it was possible to integrate cells with finer resolutions (up to 5 meters on a side). 

In its 2026 update, the 50 m grid system is divided into 331 parts with a side of 50 km in order to limit the number of cells per part of the grid to millions and thus facilitate geospatial processing. This grid includes a total of approximately 350 million cells or 875,000 km2. It is backwards compatible with the 50 m grid broadcast by the ISQ in 2018 (spatial structure and unique identifiers are identical, only the fragmentation is different).

**Attribute information for 50 m cells: **

* id_M50: unique code of the cell;

* CO_MUN_2024: geographic code of the municipality of September 2024;

* CERQ_NV2: code of the natural region of the Quebec ecological reference framework;

* CL_COUV_T00, CL_COUV_T01a, CL_COUV_T01a, CL_COUV_T01b, CL_COUV_T02: land cover class codes from maps from the years 1990, 2000 and 2010. 

Note: the 2000s are covered by two land cover maps: CL_COUV_T01A and CL_COUV_T01b. The first inventories land cover prior to reassessment using the 2010s map, while the second shows land cover after this reassessment process.


**Complementary entity classes: **
 
* index_grid50m: index of the parts of the grid;

* Decoupage_mun_09_2024: division of municipalities;

* Decoupage_mrc_09_2024: division of geographical MRCs; 

* Decoupage_ra_09_2024: division of administrative regions. 
Source: System on administrative divisions [SDA] of the Ministry of Natural Resources and Forests [MRNF], September 2024, allows statistical compilations to be carried out according to administrative divisions hierarchically superior to municipalities.

* Decoupage_CERQ_NV1_2018: division of CERQ level 1, natural provinces;

* Decoupage_CERQ_NV2_2018: division of CERQ level 2, natural regions.
Source: Ministry of the Environment, the Fight against Climate Change, Wildlife and Parks [MELCCFP].

**Geospatial processes delivered with the grid (only with the FGDB data format, compatible with ArcGIS Pro) :**

* ModelBuilder ArcGIS Pro, allows the spatial intersection and the selection of the dominant value of a new geographic division to populate the grid (Tools\ 1_add_separation_geography); 

* ModelBuilder ArcGIS Pro, allows the statistical compilation of results according to different sections entered in the grid (Tools\ 2_compilation_stat_grille50m).

Additional information on the grid in the report [Southern Quebec Land Accounts] (https://statistique.quebec.ca/fr/fichier/comptes-des-terres-du-quebec-meridional-edition-revisee.pdf#page=46) published in October 2018 (p. 46). 
View the results of the Southern Quebec Land Accounts on the [interactive map] (https://statistique.quebec.ca/cartovista/comptes_terres/index.html) of the Institut de la Statistique du Québec.
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                  <gmd:LocalisedCharacterString locale="#fra">Le système de grilles vectorielles offre une infrastructure spatiale et statistique qui permet l’intégration de données environnementales et socioéconomiques. Son exploitation permet le croisement de différentes données spatiales à l’intérieur de mêmes unités de grille. Les résultats de projets obtenus à l’aide de ce système de grilles peuvent être plus facilement mis en relation. 

Ce système de grilles forme l’infrastructure géographique et statistique des [Comptes des terres du Québec méridional]( https://statistique.quebec.ca/fr/document/comptes-des-terres-du-quebec-meridional-regions-administratives-et-provinces-naturelles) de l’Institut de la statistique du Québec (ISQ). Il forme le contexte géospatial et statistique pour l’élaboration d’une comptabilité des écosystèmes au Québec. 

**Dans l’objectif d’améliorer le système de grilles vectorielles et les Comptes des terres du Québec méridional et de mieux anticiper les futurs besoins des utilisateurs, nous souhaiterions être informés de leur utilisation (champ d’application, objectifs de l’utilisation, territoire, association avec d’autres produits, etc.). Vous pouvez nous écrire à l’adresse : maxime.keith@stat.gouv.qc.ca**. 

Ce système de grilles permet l’intégration spatiale de données diverses relatives, par exemple, aux populations humaines, à l’économie ou aux caractéristiques des terrains. L’ISQ souhaite encourager l’utilisation de ce système dans le cadre de projets qui nécessitent l’intégration de plusieurs sources de données, l’analyse de ces données selon différentes échelles spatiales et le suivi de ces données dans le temps. Les références géographiques fixes des grilles simplifient la compilation des statistiques selon différents découpages territoriaux et facilitent le suivi des changements dans le temps. En particulier, le système de grilles favorise la cohérence des données à l’échelle provinciale. 

L’intersection spatiale de la grille et de la couche de données spatiales à intégrer permet de reporter l’information sous-jacente de la couche à l’intérieur de chaque cellule de la grille. Dans le cas des Comptes des terres du Québec méridional, l’intersection spatiale de la grille et de chacune des trois couches de couverture terrestre (années 1990, années 2000 et années 2010) a permis de reporter la couverture dominante à l’intérieur de chaque cellule de la grille. Le jeu de [fichiers matriciels des Comptes des terres du Québec méridional](https://www.donneesquebec.ca/recherche/fr/dataset/comptes-des-terres-du-quebec-meridional-changement-de-la-couverture-terrestre) est le résultat de cette intersection. 

**Caractéristiques :**
Le produit comprend deux grilles vectorielles : une formée de cellules de 1 km² (ou 1 000 m de côté), qui couvre tout le Québec, et une autre de cellules de 2 500 m² (ou 50 m de côté, soit un quart d’hectare), qui s’emboîte parfaitement dans la première et couvre le territoire québécois situé au sud du 52e parallèle. À noter que la nomenclature de ce système, conçue selon un plan cartésien, a été élaborée afin qu’il soit possible d’y intégrer des cellules à des résolutions plus fines (jusqu’à 5 mètres de côté). 

Dans son actualisation de 2026, le système de grille aux 50 m est morcelée en 331 parties de 50 km de côté afin de limiter à millions le nombre de cellules par partie de grille et ainsi de faciliter les traitements géospatiaux. Cette grille comprend un total d’environ 350 millions de cellules ou 875 000 km2. Elle est rétro compatible avec la grille aux 50 m diffusée par l’ISQ en 2018 (structure spatiale et identifiants uniques sont identiques, seul le morcellement est différent).

**Informations attributaires des cellules de 50 m :**

* ID_m50 : code unique de la cellule;

* CO_MUN_2024 : code géographique de la municipalité de septembre 2024;

* CERQ_NV2 : code de la région naturelle du cadre écologique de référence du Québec;

* CL_COUV_T00, CL_COUV_T01a, CL_COUV_T01b, CL_COUV_T02 : codes des classes de couverture terrestre des cartes des années 1990, 2000 et 2010. 

Remarque : les années 2000 sont couvertes par deux cartes de couverture terrestre : CL_COUV_T01a et CL_COUV_T01b. La première inventorie la couverture terrestre avant la réévaluation effectuée à l’aide de la carte des années 2010, alors que la seconde présente la couverture terrestre après ce processus de réévaluation.


**Classes d’entités complémentaires :**
 
* INDEX_grille50m : index des parties de la grille;

* decoupage_MUN_09_2024 : découpage des municipalités;

* decoupage_MRC_09_2024 : découpage des MRC géographiques; 

* decoupage_RA_09_2024 : découpage des régions administratives. 
Source : Système sur les découpages administratifs [SDA] du ministère des Ressources naturelles et des Forêts [MRNF], septembre 2024, permet d’effectuer des compilations statistiques selon les découpages administratifs hiérarchiquement supérieurs à municipalités.

* decoupage_CERQ_NV1_2018 : découpage du niveau 1 du CERQ, provinces naturelles;

* decoupage_CERQ_NV2_2018 : découpage du niveau 2 du CERQ, régions naturelles.
Source : ministère de l’Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs [MELCCFP].

**Processus géospatiaux livrés avec la grille (uniquement avec le format de données FGDB, compatible avec ArcGis Pro) :**

* ModelBuilder ArcGis Pro, permet l’intersection spatiale et la sélection de la valeur dominante d’un nouveau découpage géographique devant peupler la grille (Outils\1_ajout_decoupage_geographique); 

* ModelBuilder ArcGis Pro, permet la compilation statistique de résultats selon différents découpages renseignés dans la grille (Outils\2_compilation_stat_grille50m).

Information complémentaire sur la grille dans le rapport [Comptes des terres du Québec méridional](https://statistique.quebec.ca/fr/fichier/comptes-des-terres-du-quebec-meridional-edition-revisee.pdf#page=46) paru en octobre 2018 (p. 46). 
Visualisez les résultats des Comptes des terres du Québec méridional sur la [carte interactive](https://statistique.quebec.ca/cartovista/comptes_terres/index.html) de l'Institut de la statistique du Québec.</gmd:LocalisedCharacterString>
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