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Data & Architecture

Architecture is how you decide what can be computed, shared, reproduced, and trusted.

What Belongs Here

<ul><li>Formats and storage strategies (raster, vector, catalogs)</li><li>Processing pipelines, transformations, and reproducibility</li><li>"Analysis-ready" as a contract</li></ul>

Start Here

Analysis-Ready Data DAT-004 Analysis-Ready Data (ARD) is satellite imagery that has been processed to a standard where it can be used directly for analysis without additional preprocessing. This means the image has been geometrically corrected (pixels are in the right geographic locations), radiometrically calibrated (pixel values represent meaningful physical quantities like surface reflectance rather than arbitrary digital numbers), atmospherically corrected (the atmosphere's distortion has been removed), and often cloud-masked (unusable pixels are flagged). ARD is the difference between receiving raw ingredients and receiving a prepared, measured, recipe-ready mise en place. Latency: From Orbit to Application COM-001 Latency in satellite systems is the total time between a sensor observing something on Earth and that observation becoming usable information. It is not one delay — it is a chain of them. Propagation through space, queuing at ground stations, decryption, format conversion, atmospheric correction, reprojection, tiling, indexing, and delivery. Some links are governed by physics and cannot be shortened. Others are engineering choices. Understanding where latency lives determines what questions you can answer with the data. A flood map delivered in 15 minutes can direct evacuations. The same map delivered in 48 hours is a historical record. Data Provenance SEC-001 Data provenance is the complete, verifiable record of where a piece of data came from, every transformation it underwent, and who or what performed those transformations. In satellite imagery and remote sensing, provenance is not a nice-to-have audit trail — it is the difference between evidence and hearsay.

Key Concepts

ARD
Readiness is specified, not implied.
Catalogs
The index of observation (planned STAC 101).
Transformations
The product is the pipeline.

All Entries

Analysis-Ready Data DAT-004 Analysis-Ready Data (ARD) is satellite imagery that has been processed to a standard where it can be used directly for analysis without additional preprocessing. This means the image has been geometrically corrected (pixels are in the right geographic locations), radiometrically calibrated (pixel values represent meaningful physical quantities like surface reflectance rather than arbitrary digital numbers), atmospherically corrected (the atmosphere's distortion has been removed), and often cloud-masked (unusable pixels are flagged). ARD is the difference between receiving raw ingredients and receiving a prepared, measured, recipe-ready mise en place.

Coming Next

STAC 101, COG 101, Reprojection & Resampling, GeoParquet and vector analytics, Zarr chunking strategies

Related Domains

Security & Provenance Communication & Infrastructure
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