L'analyse de la couverture géographique vous permet de prendre en compte la disponibilité des services (c'est-à-dire la capacité des structures de santé à accueillir des patients) et d'en tenir compte en plus des contraintes d'accessibilité physique, afin de définir l'aire de captage associée à chaque structure de santé.
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La couche de population résiduelle au format raster stockée dans le dossier "raster_population_residual_geographic_analysis_120m" contient la distribution spatiale de la population cible qui reste non couverte après l'analyse. Cette couche peut, par exemple, être utilisée comme entrée pour l'analyse de mise à l'échelle (voir section 5.5.7). Elle ressemble à ceci une fois ouvert dans un logiciel SIG:
The geographic analysis also generates two additional Excel files compared to the accessibility analysis, namely:
Health facility specific statistics
The health facility statistics file is namedL'analyse géographique génère également deux fichiers Excel supplémentaires par rapport à l'analyse d'accessibilité, à savoir:
Statistiques spécifiques à la structure de santé
Le fichier de statistiques de la structure de santé porte le nom suivant: "table_result_geographic_coverage_analysis_geographic_analysis_120m.xlsx". This file contains the columns shown below (note that the table is split in two in the below screenshot, and that we have sorted the data by decreasing value in the column "amRankComputed" - 5th column from the left in the upper part of the screnshotCe fichier contient les colonnes indiquées ci-dessous (notez que le tableau est divisé en deux dans la capture d'écran ci-dessous et que nous avons trié les données par valeur décroissante dans la colonne "amRankComputed" - 5ème colonne en partant de la gauche dans la partie supérieure de la capture d'écran):
- cat: unique identifier of the health facility as per to the field selected from the attribute table of the health facility layer.
- name: name of the health facility as per the field selected from the attribute table of the health facility layer
- capacity: maximum coverage capacity of the health facility expressed as the number of people that the facility can serve (as per the field selected from the attribute table of the health facility layer identifiant unique de la structure de santé selon le champ sélectionné dans la table attributaire de la couche des structures de santé.
- name: nom de la structure de santé selon le champ sélectionné dans la table attributaire de la couche des structures de santé.
- capacity: capacité de couverture maximale de la structure de santé exprimée en nombre de personnes que l'établissement peut desservir (selon le champ sélectionné dans la table attributaire de la couche des structures de santé).
- amRankValues_capacity: values for the parameter used to define the processing order. In the present exercise, this column contains the maximum coverage capacity of each facility as this is the option that was selected above. Please see the boxed note below for more information regarding the label and content of this column when using the other options.amRankComputed: processing order applied during the analysis based on the content of the "amRankValues_capacity" field and the direction of processing (ascending or descending), as selected by the user valeurs du paramètre utilisé pour définir l'ordre de traitement. Dans le présent exercice, cette colonne contient la capacité de couverture maximale de chaque structure, car il s'agit de l'option sélectionnée ci-dessus. Veuillez consulter l'encadré ci-dessous pour plus d'informations sur l'étiquette et le contenu de cette colonne lorsque vous utilisez les autres options.
- amRankComputed: ordre de traitement appliqué lors de l'analyse en fonction du contenu du champ "amRankValues_capacity" et du sens du traitement (croissant ou décroissant), sélectionné par l'utilisateur.
- amTravelTimeMax: maximum travel time in minutes, as set by the user for the analysis.
- amPopTravelTimeMax: total population located within the maximum travel time set for the analysis (amTravelTimeMax).
- amCorrPopTime: Pearson correlation coefficient between the set of travelling times (t, from 0 to the maximum travel time) and the corresponding covered population within this time step (i.e. the sum of population in all cells that are located between t and t+1 of travelling time). This correlation measure gives a rough estimate of how the population is distributed through space as we move outward from the health facility. As an example, a large positive value (e.g. 0.707 in the third line of the above table) means that the population is relatively uniformly distributed as you expand outwards from the facility. A strong negative correlation would mean that there is more population close to the health facility than there is far away from it. A correlation close to zero means that there is no specific tendency in how the population is spread within the catchment. This correlation should really just be used as a relative indicator, as we do not provide the statistical significance of the correlation (you should use proper GIS analysis outside AccessMod if you need statistical insights about how the population is spatially located within the catchments).
- amTravelTimeCatchment: travel time to reach the maximum extent of the catchment area attached to the health facility. This value is either:
- Equal to the maximum travel time set for the analysis (amTravelTimeMax) when the maximum coverage capacity of the facility has not been reached within the set time (120 minutes in this example). In the current exercise, this is the case for the Queen Elizabeth Hospital.
- Smaller than the maximum travel time set for the analysis (amTravelTimeMax) when the maximum coverage capacity of the facility is reached before reaching amTravelTimeMax. This is the case of The Medka Health Centre in the exercise.
- amPopCatchmentTotal: population located within the catchment area for the travel time reported in the amTravelTimeCatchment field
- amCapacityRealised: part of the maximum coverage capacity of the health facility that is being used (realized) based on the total population located in the catchment area for the given travel time. This value is:
- Equal to the maximum coverage capacity of the health facility (capacity) when this value is reached before the maximum travel time (amTravelTimeMax). An example is the Medka Health Centre in the present exercise.
- Smaller than the maximum coverage capacity of the health facility (capacity) when such capacity is not reached within the maximum travel time (amTravelTimeMax). An example is the Chiradzulu District Hospital is in this the present exercise.
- amCapacityResidual: part of the maximum coverage capacity of the health facility that is not being used. This value is calculated by making the difference between the maximum coverage capacity (capacity) and the realized capacity (amCapacityRealised). This value is therefore equal to 0 when the maximum coverage capacity is being reached within the given travel time.
- amPopCatchmentDiff: Part of the total population located in the final catchment area (amPopCatchmentTotal) which does not experience facility coverage by lack of sufficient coverage capacity in the health facility. This value is calculated by making the difference between the total population in the catchment area (amPopCatchmentTotal) and the realized capacity (amCapacityRealised). This value is therefore:
- Equal to 0 when the maximum coverage capacity is not reached within the given travel time
- Greater than 0 when the maximum coverage capacity is reached within the given travel time
- amPopCoveredPercent: cumulative geographic coverage expressed as a percentage. This value corresponds to the percentage of the initial population distribution grid (i.e. the layer selected in the "Select population layer (raster)" field) that has been covered after having processes the health facility in question.
The header of the columns containing the unique identifier, the name, and the maximum coverage capacity of each health facility in the resulting table will be the same as the header of the field you have selected from the attribute table of the health facility layer.
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