Source Registry
Every Canopulse metric is tied to a source product, vintage, access method, license, and operational note. This registry is the audit trail behind the map, reports, AI assistant, and live engine.
7
registered source and processing records
Free
raw official data for current LA County build
Terms apply
Google Earth Engine for commercial operation
TIGER/Line Census Tracts
Version
2020
Vintage
2020
Resolution
vector
Units
polygon
License
Public domain (US Census)
Cost
Free
Updates
Decennial with boundary refreshes
Historical data
Yes, but crosswalks are required across boundary changes.
Automation path
Download county tract boundaries, normalize GEOID, and use GEOID as the join key.
Note
Canonical 2020 census tract GEOID for Los Angeles County.
NLCD 2021 Tree Canopy Cover
Version
v2021-4
Vintage
2021
Resolution
30 m raster
Units
percent
License
Public domain (USGS / USFS)
Cost
Free for the source data
Updates
Annual NLCD is planned annually; legacy NLCD has fixed historical epochs.
Historical data
Yes. Legacy epochs include 2013 and 2016; Annual NLCD supports long time series where available.
Automation path
Use GEE zonal means by tract, then export tract-year canopy percent.
Note
Summarized by 2020 tract using zonal means.
Landsat 8/9 Collection 2 Level 2 ST_B10 summer mosaic
Version
Collection 2 Level 2
Vintage
2023
Resolution
100 m native, delivered at 30 m
Units
degrees Fahrenheit
License
Public domain (USGS)
Cost
Free for the source data
Updates
Scene-level updates with processing lag; seasonal composites should be rebuilt on schedule.
Historical data
Excellent. Landsat archive reaches back decades; Landsat 8 supports 2013 onward.
Automation path
Cloud-mask summer scenes, scale ST_B10 to land-surface temperature, summarize by tract.
Note
Cloud-screened summer 2023 scenes, scaled to surface temperature.
NLCD 2021 Impervious Surface
Version
v2021-4
Vintage
2021
Resolution
30 m raster
Units
percent
License
Public domain (USGS)
Cost
Free for the source data
Updates
Annual NLCD is planned annually; legacy NLCD has fixed historical epochs.
Historical data
Yes. Legacy epochs include 2013 and 2016; Annual NLCD supports long time series where available.
Automation path
Use GEE zonal means by tract, then export tract-year impervious percent.
Note
Summarized by 2020 tract using zonal means.
CDC/ATSDR SVI
Version
2022
Vintage
2022
Resolution
tract
Units
percentile
License
Public domain (US government)
Cost
Free
Updates
Every few years when CDC/ATSDR publishes a new SVI release.
Historical data
Yes, but CDC cautions that versions are not directly comparable across years.
Automation path
Download state CSV, validate fields, join by GEOID, and keep version-specific notes.
Note
RPL_THEMES used; missing flags are excluded from scoring.
CalEnviroScreen 4.0
Version
4.0
Vintage
2021
Resolution
tract
Units
percentile
License
California Open Data
Cost
Free
Updates
Every few years; CalEnviroScreen 4.0 was released in 2021.
Historical data
Limited. Version history exists, but indicators and tract vintages change.
Automation path
Download official table or query feature service, then crosswalk to 2020 tracts if needed.
Note
2010 tract data crosswalked to 2020 tracts by population-weighted assignment.
Google Earth Engine
Version
Cloud project registration required
Vintage
2026
Resolution
server-side geospatial computation
Units
pipeline runtime
License
Platform terms apply
Cost
Free only for eligible noncommercial/research use; commercial or government operational use can require a paid commercial account.
Updates
On demand or scheduled
Historical data
Hosts and processes many historical raster products.
Automation path
Run tract-year zonal statistics jobs, export CSV/JSON, then ingest into Canopulse.
Note
This is the recommended heavy processing layer, but commercial terms must be reviewed before paid Canopulse use.
Need machine-readable source metadata?
Use the JSON endpoint for automated QA, docs, and pipeline checks.