ELC trca

Polygon layer displaying Toronto and Region Conservation Authority (TRCA) ecological land classification (ELC) data. TRCA's Terrestrial Monitoring and Inventory Group utilizes a variety of data collection methods in order to gain an understanding of the natural system at different scales. The methods have been chosen to complement each other and provide a more complete picture of all the components of the natural system; this provides the information basis for further data analysis and interpretation that will eventually assist land planning decisions and action. ELC is collected on an annual basis in various locations by biologists.

The standard data collection protocol for TRCA since 2001 has been based on parts of the Ecological Land Classification System, or ELC, for Southern Ontario, developed by the Ontario Ministry of Natural Resources (Lee et al., 1998). The ELC method classifies the landscape using an organizational framework of a nested hierarchy of scale. The broadest scale is the ELC Community Class (e.g. Forest), and the most detailed is Vegetation Type (e.g. dry-fresh sugar maple forest). A full ELC survey to the level of vegetation type is a very detailed and time-consuming process. The TRCA protocol for surveying vegetation communities strikes a balance between giving enough detail to provide meaningful descriptions of vegetation communities and the constraints of time and funding. For example, resources are unlikely to be available to pursue detailed soil analysis (as outlined in the ELC field guide) in every patch surveyed in the TRCA jurisdiction, especially in the baseline phase. A code from the ELC system is assigned to each polygon. For reference, a list of communities with their codes, scores, and descriptions is carried into the field by the surveyor. Additional vegetation types described by the TRCA since 2000 that are not found in the ELC field guide are included in this reference list. 

  ELC Attribute DescriptionsField NameDescriptionOBJECTIDNumber uniquely generated for each polygon entry in Arcmap. A new set of numbers is generated each time a new layer is created in Arcmap.POLY_NONumber of the ELC community polygon assigned by field staff to manage observations in the field. Used for reference and internal purposes.DATEDate the ELC community was collected/observed.OBSERVERName of biologist who recorded the observation.CPYDENSITYCanopy Density – A measure of how closed or open the canopy (tallest vegetation) cover is within the community. Estimate based on following cover ranges (<10%, 10-25%, 25-35%, 35-60%, >60%).BLOCKAlphabetical value indicating major separated habitat units within a site, usually delineated by major roads bisecting natural cover.CANOPYSP1Seven-character flora code of the most prevalent species within the canopy.CPYDOM1Ranking of prevalence for the species identified in CANOPSP1 within the canopy.CPYSP1_STAELC species modifier for CANOPYSP1 – provides additional information about relative abundance, identification, or condition of species. This and all ELC species modifiers are described in TRCA (2025): Addendum 2-ELC Species Modifiers.CANOPYSP2Seven-character flora code of the second most prevalent species within the canopy.CPYDOM2Ranking of prevalence the species identified in CANOPYSP2 within the canopy.CPYSP2_STAELC species modifier for CANOPYSP2.CANOPYSP3Seven-character flora code of the third most prevalent species within the canopy.CPYDOM3Ranking of prevalence for the species identified in CANOPYSP3 within the canopy.CPYSP3_STAELC species modifier for CANOPYSP3.CANOPYSP4Seven-character flora code of the fourth most prevalent species within the canopy.CPYDOM4Ranking of prevalence for the species identified in CANOPYSP4 within the canopy.CPYSP4_STAELC species modifier for CANOPYSP4.MDLDENSITYMidstory Density – A measure of how closed or open the midstory vegetation cover is within the community. Estimate based on following cover ranges (<10%, 10-25%, 25-35%, 35-60%, >60%).MIDDLESP1Seven-character flora code of the most prevalent species within the middle canopy.MDLDOM1Ranking of prevalence for the species identified in MIDDLESP1 within the midstory.MDLSP1_STAELC species modifier for MIDDLESP1.MIDDLESP2Seven-character flora code of the second most prevalent species within the midstory.MDLDOM2Ranking of prevalence for the species identified in MIDDLESP2 within the midstory.MDLSP2_STAELC species modifier for MIDDLESP2.MIDDLESP3Seven-character flora code of the third most prevalent species within the midstory.MDLDOM3Ranking of prevalence for the species identified in MIDDLESP3 within the midstory.MDLSP3_STAELC species modifier for MIDDLESP3.MIDDLESP4Seven-character flora code of the fourth most prevalent species within the midstory.MDLDOM4Ranking of prevalence for the species identified in MIDDLESP4 within the midstory.MDLSP4_STAELC species modifier for MIDDLESP4.LWRDENSITYLower (Understory) Density - A measure of how closed or open the understory vegetation cover is within the community. Estimate based on following cover ranges (<10%, 10-25%, 25-35%, 35-60%, >60%).LOWERSP1Seven-character flora code of the most prevalent species within the understory.LWRDOM1Ranking of prevalence the species identified in LOWERSP1 within the understory.LWRSP1_STAELC species modifier for LOWERSP1.LOWERSP2Seven-character flora code of the second most prevalent species within the understory.LWRDOM2Ranking of prevalence for the species identified in LOWERSP2 within the understory.LWRSP2_STAELC species modifier for LOWERSP2.LOWERSP3Seven-character flora code of the third most prevalent species within the understory.LWRDOM3Ranking of prevalence for the species identified in LOWERSP3 within the understory.LWRSP3_STAELC species modifier for LOWERSP3.LOWERSP4Seven-character flora code of the fourth most prevalent species within the understory.LWRDOM4Ranking of prevalence for the species identified in LOWERSP3 within the understory.LWRSP4_STAELC species modifier for LOWERSP4.GNDDENSITYGround Layer Density – A measure of how closed or open the forest floor vegetation cover is within the community. Estimate based on following cover ranges (<10%, 10-25%, 25-35%, 35-60%, >60%).GROUNDSP1Seven-character flora code of the most prevalent species within the ground level.GNDDOM1Ranking of prevalence for the species identified in GROUNDSP1 within the ground level.GNDSP1_STAELC species modifier for GROUNDSP1.GROUNDSP2Seven-character flora code of the second most prevalent species within the ground level.GNDDOM2Ranking of prevalence for the species identified in GROUNDSP2 within the ground level.GNDSP2_STAELC species modifier for GROUNDSP2.GROUNDSP3Seven-character flora code of the third most prevalent species within the ground level.GNDDOM3Ranking of prevalence for the species identified in GROUNDSP3 within the ground level.GNDSP3_STAELC species modifier for GROUNDSP3.GROUNDSP4Seven-character flora code of the fourth most prevalent species within the ground level.GNDDOM4Ranking of prevalence for the species identified in GROUNDSP4 within the ground level.GNDSP4_STAELC species modifier for GROUNDSP4.AGECLASSAge classification of the ELC community. Derived from successional and chronological age for treed communities only. The five potential age classes are: Pioneer, Young, Mid-Aged, Mature, and Old Growth. Interpretations for these age classes can be found in TRCA (2023): Terrestrial Biological Inventory Data Collection Protocol Update 2023 (Table 2).ELCCODE14–7-character code describing the ELC community. Complete list of codes and descriptions can be found in TRCA (2025): Addendum 3-Vegetation Communities Field Reference List, based on Lee et al. (1998).INCLUSION14–7-character ELC code describing distinct ELC subunit too small to map within the larger ELC community. If present.INCL1SP1Seven-character flora code of the most prevalent species within the inclusion (INCLUSION1).INCL1SP2Seven-character flora code of the second most prevalent species within the inclusion (INCLUSION1).INCLUSION24–7-character ELC code describing distinct ELC subunit too small to map within the larger ELC community. If present.INCL2SP1Seven-character flora code of the most prevalent species within the inclusion (INCLUSION2).INCL2SP2Seven-character flora code of the second most prevalent species within the inclusion (INCLUSION2).COMPLEX14–7-character ELC code describing distinct ELC subunit forming interspersed secondary network within the larger ELC community. If present.COMP1SP1Seven-character flora code of the most prevalent species within the complex (COMPLEX1).COMP1SP2Seven-character flora code of the second most prevalent species within the complex (COMPLEX1).COMPLEX24–7-character ELC code describing distinct ELC subunit existing within the larger ELC community. If present.COMP2SP1Seven-character flora code of the most prevalent species within the complex (COMPLEX2).COMP2SP2Seven-character flora code of the second most prevalent species within the complex (COMPLEX2).TRAIL_TRMPThis can result from pedestrians, mountain bikes, and/or off-leash dogs. Urban forest patches with heavy trampling have virtually no ground layer, except scattered exotics such as garlic mustard. Severity for this and all other disturbances below are discussed in TRCA (2023).BROWSINGPresence of herbivory from deer, geese, or other non-domesticated fauna.GRAZINGPresence/severity of herbivory from cattle or other livestock.EXOTICSPresence/severity of the exotic species present in a community, including all layers.LOG_CUTPresence/severity  of mechanical clearing of the canopy, including opening of the forest for landscaping purposes. FLOODINGPresence/severity of periodic or permanent flooding conditions, storm-water flooding including scouring, flattened and muddy vegetation and silt deposits. BEAVER_ACTPresence/severity of beaver activity.TRASH_DMPPresence/severity of litter, illegal dumping, fire-pits, and crude construction.FILL_SDMTPresence/severity of soil removal, dumping of fill, or excavation within the community.Tree Dieback/DeclinePresence/severity of major, widespread tree decline or death from insect outbreak, disease, poisoning, or flooding. Storm DamagePresence/severity of sudden tree blow down or breakage due to storm events (usually multiple trees affected in a similar time frame).Yard WastePresence/severity of organic debris dumped from adjacent properties (potted plants, grass and hedge clippings, including potentially live invasive material).VERNAL_PLVernal pool – presence or absence of ephemeral ponds.Groundwater SeepagePresence or absence of groundwater seepage as evidenced by springs, indicator species or iron precipitates.ORG_HOROrganic horizon: depth of organic material present along soil profile (cm).ORG_TEXSoil texture of organic horizon.AHOR_DEPTHDepth of A Horizon (cm).AHOR_TEXSoil texture of the A Horizon.BHOR_DEPTHDepth of B Horizon (cm).BHOR_TEXSoil texture of the B Horizon.DEPTH_MOTTDepth to mottles (cm).DEPTH_GLEYDepth to gley (cm).DEPTH_KDepth to carbonates (cm); an indication of C horizon.EFFECT_TEXEffective texture.MOIST_REGMoisture regime.DEPTH_AUGTotal depth augured (cm).COMMENTSAdditional comments.ELC_CODE4–7-character code describing the ELC community. Complete list of codes and descriptions can be found in  TRCA (2025): Addendum 3-Vegetation Communities Field Reference List, based on Lee et al. (1998).ELC_NAMECommon name of the Ecological Land Classification community.Score_dateDate the L-Rank was calculated.ELC_Local_RankELC Local Concern Score (L-Rank). Definition and interpretation for this and all score components can be found in TRCA (2024): Scoring and Ranking TRCA's Vegetation Communities, Flora, and Fauna Species.Local_OccurrenceLocal Occurrence score. Average of Local Distribution and Area Score. Local_DistributionLocal Distribution Score.Area_ScoreArea Score.Geo_Physical_RequirementsGeophysical Score.QualityScore of “100” indicates that ELC code is complete and in current usage. Score of “0” indicates that ELC code is incomplete or invalid.Shape_LengthLength of the ELC community perimeter (m).Shape_AreaArea of the ELC community in square metres.   Last updated: September 2025

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Dernière mise à jour mai 19, 2026, 16:32 (TU)
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ELC trca
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Polygon layer displaying Toronto and Region Conservation Authority (TRCA) ecological land classification (ELC) data. TRCA's Terrestrial Monitoring and Inventory Group utilizes a variety of data collection methods in order to gain an understanding of the natural system at different scales. The methods have been chosen to complement each other and provide a more complete picture of all the components of the natural system; this provides the information basis for further data analysis and interpretation that will eventually assist land planning decisions and action. ELC is collected on an annual basis in various locations by biologists.

The standard data collection protocol for TRCA since 2001 has been based on parts of the Ecological Land Classification System, or ELC, for Southern Ontario, developed by the Ontario Ministry of Natural Resources (Lee et al., 1998). The ELC method classifies the landscape using an organizational framework of a nested hierarchy of scale. The broadest scale is the ELC Community Class (e.g. Forest), and the most detailed is Vegetation Type (e.g. dry-fresh sugar maple forest). A full ELC survey to the level of vegetation type is a very detailed and time-consuming process. The TRCA protocol for surveying vegetation communities strikes a balance between giving enough detail to provide meaningful descriptions of vegetation communities and the constraints of time and funding. For example, resources are unlikely to be available to pursue detailed soil analysis (as outlined in the ELC field guide) in every patch surveyed in the TRCA jurisdiction, especially in the baseline phase. A code from the ELC system is assigned to each polygon. For reference, a list of communities with their codes, scores, and descriptions is carried into the field by the surveyor. Additional vegetation types described by the TRCA since 2000 that are not found in the ELC field guide are included in this reference list. 

  ELC Attribute DescriptionsField NameDescriptionOBJECTIDNumber uniquely generated for each polygon entry in Arcmap. A new set of numbers is generated each time a new layer is created in Arcmap.POLY_NONumber of the ELC community polygon assigned by field staff to manage observations in the field. Used for reference and internal purposes.DATEDate the ELC community was collected/observed.OBSERVERName of biologist who recorded the observation.CPYDENSITYCanopy Density – A measure of how closed or open the canopy (tallest vegetation) cover is within the community. Estimate based on following cover ranges (<10%, 10-25%, 25-35%, 35-60%, >60%).BLOCKAlphabetical value indicating major separated habitat units within a site, usually delineated by major roads bisecting natural cover.CANOPYSP1Seven-character flora code of the most prevalent species within the canopy.CPYDOM1Ranking of prevalence for the species identified in CANOPSP1 within the canopy.CPYSP1_STAELC species modifier for CANOPYSP1 – provides additional information about relative abundance, identification, or condition of species. This and all ELC species modifiers are described in TRCA (2025): Addendum 2-ELC Species Modifiers.CANOPYSP2Seven-character flora code of the second most prevalent species within the canopy.CPYDOM2Ranking of prevalence the species identified in CANOPYSP2 within the canopy.CPYSP2_STAELC species modifier for CANOPYSP2.CANOPYSP3Seven-character flora code of the third most prevalent species within the canopy.CPYDOM3Ranking of prevalence for the species identified in CANOPYSP3 within the canopy.CPYSP3_STAELC species modifier for CANOPYSP3.CANOPYSP4Seven-character flora code of the fourth most prevalent species within the canopy.CPYDOM4Ranking of prevalence for the species identified in CANOPYSP4 within the canopy.CPYSP4_STAELC species modifier for CANOPYSP4.MDLDENSITYMidstory Density – A measure of how closed or open the midstory vegetation cover is within the community. Estimate based on following cover ranges (<10%, 10-25%, 25-35%, 35-60%, >60%).MIDDLESP1Seven-character flora code of the most prevalent species within the middle canopy.MDLDOM1Ranking of prevalence for the species identified in MIDDLESP1 within the midstory.MDLSP1_STAELC species modifier for MIDDLESP1.MIDDLESP2Seven-character flora code of the second most prevalent species within the midstory.MDLDOM2Ranking of prevalence for the species identified in MIDDLESP2 within the midstory.MDLSP2_STAELC species modifier for MIDDLESP2.MIDDLESP3Seven-character flora code of the third most prevalent species within the midstory.MDLDOM3Ranking of prevalence for the species identified in MIDDLESP3 within the midstory.MDLSP3_STAELC species modifier for MIDDLESP3.MIDDLESP4Seven-character flora code of the fourth most prevalent species within the midstory.MDLDOM4Ranking of prevalence for the species identified in MIDDLESP4 within the midstory.MDLSP4_STAELC species modifier for MIDDLESP4.LWRDENSITYLower (Understory) Density - A measure of how closed or open the understory vegetation cover is within the community. Estimate based on following cover ranges (<10%, 10-25%, 25-35%, 35-60%, >60%).LOWERSP1Seven-character flora code of the most prevalent species within the understory.LWRDOM1Ranking of prevalence the species identified in LOWERSP1 within the understory.LWRSP1_STAELC species modifier for LOWERSP1.LOWERSP2Seven-character flora code of the second most prevalent species within the understory.LWRDOM2Ranking of prevalence for the species identified in LOWERSP2 within the understory.LWRSP2_STAELC species modifier for LOWERSP2.LOWERSP3Seven-character flora code of the third most prevalent species within the understory.LWRDOM3Ranking of prevalence for the species identified in LOWERSP3 within the understory.LWRSP3_STAELC species modifier for LOWERSP3.LOWERSP4Seven-character flora code of the fourth most prevalent species within the understory.LWRDOM4Ranking of prevalence for the species identified in LOWERSP3 within the understory.LWRSP4_STAELC species modifier for LOWERSP4.GNDDENSITYGround Layer Density – A measure of how closed or open the forest floor vegetation cover is within the community. Estimate based on following cover ranges (<10%, 10-25%, 25-35%, 35-60%, >60%).GROUNDSP1Seven-character flora code of the most prevalent species within the ground level.GNDDOM1Ranking of prevalence for the species identified in GROUNDSP1 within the ground level.GNDSP1_STAELC species modifier for GROUNDSP1.GROUNDSP2Seven-character flora code of the second most prevalent species within the ground level.GNDDOM2Ranking of prevalence for the species identified in GROUNDSP2 within the ground level.GNDSP2_STAELC species modifier for GROUNDSP2.GROUNDSP3Seven-character flora code of the third most prevalent species within the ground level.GNDDOM3Ranking of prevalence for the species identified in GROUNDSP3 within the ground level.GNDSP3_STAELC species modifier for GROUNDSP3.GROUNDSP4Seven-character flora code of the fourth most prevalent species within the ground level.GNDDOM4Ranking of prevalence for the species identified in GROUNDSP4 within the ground level.GNDSP4_STAELC species modifier for GROUNDSP4.AGECLASSAge classification of the ELC community. Derived from successional and chronological age for treed communities only. The five potential age classes are: Pioneer, Young, Mid-Aged, Mature, and Old Growth. Interpretations for these age classes can be found in TRCA (2023): Terrestrial Biological Inventory Data Collection Protocol Update 2023 (Table 2).ELCCODE14–7-character code describing the ELC community. Complete list of codes and descriptions can be found in TRCA (2025): Addendum 3-Vegetation Communities Field Reference List, based on Lee et al. (1998).INCLUSION14–7-character ELC code describing distinct ELC subunit too small to map within the larger ELC community. If present.INCL1SP1Seven-character flora code of the most prevalent species within the inclusion (INCLUSION1).INCL1SP2Seven-character flora code of the second most prevalent species within the inclusion (INCLUSION1).INCLUSION24–7-character ELC code describing distinct ELC subunit too small to map within the larger ELC community. If present.INCL2SP1Seven-character flora code of the most prevalent species within the inclusion (INCLUSION2).INCL2SP2Seven-character flora code of the second most prevalent species within the inclusion (INCLUSION2).COMPLEX14–7-character ELC code describing distinct ELC subunit forming interspersed secondary network within the larger ELC community. If present.COMP1SP1Seven-character flora code of the most prevalent species within the complex (COMPLEX1).COMP1SP2Seven-character flora code of the second most prevalent species within the complex (COMPLEX1).COMPLEX24–7-character ELC code describing distinct ELC subunit existing within the larger ELC community. If present.COMP2SP1Seven-character flora code of the most prevalent species within the complex (COMPLEX2).COMP2SP2Seven-character flora code of the second most prevalent species within the complex (COMPLEX2).TRAIL_TRMPThis can result from pedestrians, mountain bikes, and/or off-leash dogs. Urban forest patches with heavy trampling have virtually no ground layer, except scattered exotics such as garlic mustard. Severity for this and all other disturbances below are discussed in TRCA (2023).BROWSINGPresence of herbivory from deer, geese, or other non-domesticated fauna.GRAZINGPresence/severity of herbivory from cattle or other livestock.EXOTICSPresence/severity of the exotic species present in a community, including all layers.LOG_CUTPresence/severity  of mechanical clearing of the canopy, including opening of the forest for landscaping purposes. FLOODINGPresence/severity of periodic or permanent flooding conditions, storm-water flooding including scouring, flattened and muddy vegetation and silt deposits. BEAVER_ACTPresence/severity of beaver activity.TRASH_DMPPresence/severity of litter, illegal dumping, fire-pits, and crude construction.FILL_SDMTPresence/severity of soil removal, dumping of fill, or excavation within the community.Tree Dieback/DeclinePresence/severity of major, widespread tree decline or death from insect outbreak, disease, poisoning, or flooding. Storm DamagePresence/severity of sudden tree blow down or breakage due to storm events (usually multiple trees affected in a similar time frame).Yard WastePresence/severity of organic debris dumped from adjacent properties (potted plants, grass and hedge clippings, including potentially live invasive material).VERNAL_PLVernal pool – presence or absence of ephemeral ponds.Groundwater SeepagePresence or absence of groundwater seepage as evidenced by springs, indicator species or iron precipitates.ORG_HOROrganic horizon: depth of organic material present along soil profile (cm).ORG_TEXSoil texture of organic horizon.AHOR_DEPTHDepth of A Horizon (cm).AHOR_TEXSoil texture of the A Horizon.BHOR_DEPTHDepth of B Horizon (cm).BHOR_TEXSoil texture of the B Horizon.DEPTH_MOTTDepth to mottles (cm).DEPTH_GLEYDepth to gley (cm).DEPTH_KDepth to carbonates (cm); an indication of C horizon.EFFECT_TEXEffective texture.MOIST_REGMoisture regime.DEPTH_AUGTotal depth augured (cm).COMMENTSAdditional comments.ELC_CODE4–7-character code describing the ELC community. Complete list of codes and descriptions can be found in  TRCA (2025): Addendum 3-Vegetation Communities Field Reference List, based on Lee et al. (1998).ELC_NAMECommon name of the Ecological Land Classification community.Score_dateDate the L-Rank was calculated.ELC_Local_RankELC Local Concern Score (L-Rank). Definition and interpretation for this and all score components can be found in TRCA (2024): Scoring and Ranking TRCA's Vegetation Communities, Flora, and Fauna Species.Local_OccurrenceLocal Occurrence score. Average of Local Distribution and Area Score. Local_DistributionLocal Distribution Score.Area_ScoreArea Score.Geo_Physical_RequirementsGeophysical Score.QualityScore of “100” indicates that ELC code is complete and in current usage. Score of “0” indicates that ELC code is incomplete or invalid.Shape_LengthLength of the ELC community perimeter (m).Shape_AreaArea of the ELC community in square metres.   Last updated: September 2025
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559184.0
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2025-06-20
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Champ Valeur
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public (affichage de la valeur pour English)
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License not specified
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https://trca-camaps.opendata.arcgis.com/datasets/camaps::elc-trca-1 (affichage de la valeur pour English)
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trca_d.macleod (affichage de la valeur pour English)
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Conservation Ontario (affichage de la valeur pour English)
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[email protected] (affichage de la valeur pour English)
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Conservation Ontario (affichage de la valeur pour English)
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trca_d.macleod
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2025-09-10
Champ Valeur
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245d56e3abee4921b4b2fd0665833789 (affichage de la valeur pour English)
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English
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https://trca-camaps.opendata.arcgis.com/datasets/camaps::elc-trca-1 (affichage de la valeur pour English)
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Champ Valeur
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None
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None
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Conservation Ontario (affichage de la valeur pour English)
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Champ Valeur
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Champ Valeur
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52269
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117
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6115473
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