Earth observation / Land-surface temperature and emissivity
MODIS daily land-surface temperature over Tbilisi
Planetary Computer exposes NASA MOD11A1 Collection 6.1 daily tiles covering Tbilisi. Each item includes 1-km daytime and nighttime land-surface temperature, observation times and view angles, emissivity bands 31/32, clear-sky coverage and separate quality-control rasters. This measures modeled/retrieved surface skin temperature—not 2-metre air temperature—and cloudy pixels are often missing or low quality.
Provenance and access
How the data is reached
Public STAC metadata and public SAS-signing service for temporary COG access.
STAC collection declares proprietary; NASA LP DAAC is the listed licensor
Tbilisi MOD11A1 search
https://planetarycomputer.microsoft.com/api/stac/v1/search?bbox=44.70,41.67,44.88,41.80&collections=modis-11A1-061&datetime=2026-06-01T00:00:00Z/2026-07-22T23:59:59Z&limit=2 ↗- Method
- GET
- Format
- GeoJSON/STAC JSON
- Authentication
- None
- Method
- GET
- Format
- STAC Collection JSON
- Authentication
- None
- Method
- GET
- Format
- JSON
- Authentication
- None
Field-level detail
What is actually returned
MOD11A1 item
Daily tile identity and interval.
| Field / path | Type | Null? | Example | Meaning | Freshness |
|---|---|---|---|---|---|
id / collection / bbox / geometry | string / string / bbox / polygon | No | MOD11A1.A2026198.h21v04.061.2026199234220 | Product identity and spatial coverage | reference |
properties.datetime | null | Yes | null | Interval item has no single datetime | reference |
properties.start_datetime / end_datetime | ISO datetime | No | 2026-07-17T00:00:00Z / 2026-07-17T23:59:59Z | Daily observation window | historical |
properties.platform / instruments[] | string / array | No | terra / [modis] | Satellite and sensor | reference |
properties.modis:tile-id / horizontal-tile / vertical-tile | string / integers | No | 51021004 / 21 / 4 | MODIS tile identity | reference |
properties.eo:cloud_cover | percentage | No | 39 | Catalog cloud-cover metadata | derived |
MOD11A1 assets
Daily temperature, emissivity, time, view and QA COGs.
| Field / path | Type | Null? | Example | Meaning | Freshness |
|---|---|---|---|---|---|
LST_Day_1km / LST_Night_1km | uint16 COG; scale 0.02 Kelvin; 1000m | No | stored 15000 → 300 K | Daytime and nighttime surface temperature | historical |
QC_Day / QC_Night | uint8 COG; 1000m | No | packed QA bits | Mandatory quality, data-quality, emissivity-error and LST-error flags | reference |
Day_view_time / Night_view_time | COG rasters | No | local observation time layer | Per-pixel observation time | historical |
Day_view_angl / Night_view_angl | COG rasters | No | view-angle layer | Sensor view angle | reference |
Emis_31 / Emis_32 | COG rasters | No | emissivity bands | Surface emissivity for MODIS thermal bands 31 and 32 | historical |
Clear_day_cov / Clear_night_cov | COG rasters | No | clear-sky coverage | Clear-sky observation coverage | historical |
hdf / rendered_preview / tilejson | HDF / image / JSON | No | supporting assets | Original product and visualization helpers | reference |
Representative evidence
Sample records
Tbilisi MODIS daily LST item
Retrieved 2026-07-22 14:04 Asia/Tbilisi
{"id":"MOD11A1.A2026198.h21v04.061.2026199234220","properties":{"start_datetime":"2026-07-17T00:00:00Z","end_datetime":"2026-07-17T23:59:59Z","eo:cloud_cover":39},"LST_Day_1km":{"unit":"Kelvin","scale":0.02,"data_type":"uint16","spatial_resolution":1000},"assetKeys":["LST_Day_1km","LST_Night_1km","QC_Day","QC_Night","Emis_31","Emis_32"]}Boundaries
Reliability, caveats, and privacy
What held up
- Current daily item for the local MODIS tile was returned
- Day/night, view-time and QC layers make observations auditable
- Archive extends to 2000
What can go wrong
- Land-surface temperature is not air temperature
- Apply the 0.02 Kelvin scale
- Clouds create missing/invalid pixels; QA is mandatory
- One-kilometre pixels are coarse within Tbilisi
- Collection declares proprietary and signed URLs expire
Cross-source possibilities
Ideas using this source
Source trail
Primary pages and documentation
https://planetarycomputer.microsoft.com/api/stac/v1/collections/modis-11A1-061- DocumentationNASA MOD11A1 product page ↗
https://lpdaac.usgs.gov/products/mod11a1v061/