feat(stac): add Zarr assets to the map - #2005
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📝 WalkthroughWalkthroughThe STAC plugin now recognizes Zarr assets, derives selectable drawable variables, validates stores and targets, and adds selected variables as raster layers. It handles Icechunk and unreadable stores, preserves item bounds, updates labels, and adds unit, integration, and end-to-end tests. ChangesSTAC Zarr integration
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The change adds Zarr assets, but valid nested Zarr array URLs can still be rejected because their embedded array path is ignored, and the related test does not verify the classification result. This bounded feature-correctness issue should be fixed or explicitly accepted before merge. Sequence Diagram(s)sequenceDiagram
participant Catalog
participant STACPlugin
participant STACAPI
participant ZarrStore
participant Map
Catalog->>STACPlugin: select Zarr asset and target
STACPlugin->>STACAPI: resolve layer request
STACAPI->>ZarrStore: validate Zarr array access
ZarrStore-->>STACAPI: return array status
STACPlugin->>Map: add selected Zarr raster layer
Possibly related PRs
Suggested reviewers: Poem
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Inline comments:
In `@packages/plugins/src/plugins/maplibre-stac.ts`:
- Around line 710-713: Update the request construction around zarrLayerRequest
to call zarrCrs(item, asset) once, store its result in a local variable, and
reuse that value when conditionally adding crs to the options.
- Around line 611-622: Update assetOptionLabel and its renderItems call site to
use canAddAsset(item, key, asset) for addability, matching the Add button’s
validation including Zarr drawable-target requirements. Also update the
renderItems preselection assets.find predicate to use canAddAsset(item, key,
asset), so the row selects an addable asset.
In `@packages/plugins/src/plugins/stac-api.ts`:
- Around line 802-812: Update zarrStorePath in
packages/plugins/src/plugins/stac-api.ts at lines 802-812 to remove the URL
search and fragment before locating .zarr/ and deriving the array path. Update
zarrStoreIsReadable in packages/plugins/src/plugins/maplibre-stac.ts at lines
701-729 to place Zarr keys before the signed URL query and ensure the reader
handles the query-bearing store URL, or pass the token through headers instead.
- Around line 896-912: Update zarrStoreIsReadable to combine the caller-provided
signal with a bounded timeout signal for each fetch probe, ensuring stalled
hosts return within the timeout. In the catch block, rethrow AbortError only
when the caller’s signal is aborted; treat timeout-triggered aborts as an
unreadable store and return false.
In `@tests/stac-real-catalogs.test.ts`:
- Around line 78-84: In the test around assetTargets, add assert.ok(target)
before accessing target.id so TypeScript narrows the destructured AssetTarget |
undefined value; keep the existing ID assertion and request construction
unchanged.
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apps/geolibre-desktop/src/components/layout/TopToolbar.tsxapps/geolibre-desktop/src/i18n/locales/en.jsone2e/stac-zarr.spec.tspackages/plugins/src/plugins/maplibre-components.tspackages/plugins/src/plugins/maplibre-stac.tspackages/plugins/src/plugins/stac-api.tstests/fixtures/stac-items/eopf-sentinel2.jsontests/fixtures/stac-items/pc-era5.jsontests/stac-api.test.tstests/stac-real-catalogs.test.ts
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Inline comments:
In `@packages/plugins/src/plugins/maplibre-stac.ts`:
- Around line 707-710: Update the signed-store handling around zarrStorePath,
zarrStoreTakesKeys, and zarrStoreIsReadable so SAS credentials remain available
for every metadata and chunk request, using transformRequest or an equivalent
credential-aware proxy. Ensure signed URLs are not rejected solely because
zarrStoreTakesKeys(url) is true, while preserving the existing unreadable-store
error for genuinely inaccessible stores.
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| const href = await readableHref(item, asset.href); | ||
| const { url } = zarrStorePath(href); | ||
| // A signed store is read key by key, and the token cannot survive being followed by one. | ||
| if (!zarrStoreTakesKeys(url) || !(await zarrStoreIsReadable(url, fetch, signal))) { | ||
| throw new Error(labels.addZarrUnreadable); | ||
| } |
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Possible bug: signing an Azure-hosted Zarr href before the readability check may make PC-hosted Zarr assets permanently unaddable.
readableHref (L656) signs any Azure blob href via planetaryComputerSigner(), which — per the doc comment two lines above (L645-647) — attaches a SAS token as a query string. For a href that doesn't already point into the store (e.g. era5-pds's precipitation_amount_1hour_Accumulation.zarr, one of this PR's own fixtures), zarrStorePath won't find a .zarr/ marker and returns the whole signed href — query string included — as url. zarrStoreTakesKeys(url) then sees a non-empty search and returns false, so this branch always throws addZarrUnreadable for exactly the private-container assets that signing exists to unlock.
If a container-scoped SAS token from planetaryComputerSigner is actually meant to be reusable across blob paths in the container (which is how Planetary Computer's signing is normally used for chunked Zarr/xarray reads), this check may be discarding a legitimately-readable store rather than protecting against a broken one. Worth verifying against a real signed Planetary Computer Zarr URL (e.g. era5-pds) — if Add always fails for it, this defeats the purpose of calling readableHref here at all.
Confidence: medium — the control flow is verified from the code, but I can't verify at runtime whether signUrl issues container-scoped tokens or whether the underlying Zarr reader can actually consume <store>/<key>?<token> correctly.
| const syncAsset = (): void => { | ||
| const [, asset] = selected(); | ||
| const addable = isVisualizableAsset(asset); | ||
| const [key, asset] = selected(); | ||
| const addable = canAddAsset(item, key, asset); | ||
| const targets = assetTargets(item, key, asset); | ||
| targetSelect.innerHTML = ""; | ||
| for (const target of targets) { | ||
| const option = el("option", target.label); | ||
| option.value = target.id; | ||
| targetSelect.append(option); | ||
| } | ||
| // One target is the asset itself; hide a choice the user does not have. | ||
| targetSelect.hidden = targets.length < 2 || !addable; |
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Minor UX nit: syncAsset() clears and rebuilds targetSelect's options every time it runs, including from the add click handler's adding = true; syncAsset(); call right after the click. Since no option carries selected, the browser auto-selects the first option once the list is rebuilt, so the visible dropdown silently jumps back to the first variable (e.g. "temperature") as soon as Add is clicked, even if the user had picked a different one (e.g. "precipitation"). The already-in-flight add is unaffected because target is captured before syncAsset() runs, but the user's selection is lost afterward, so re-adding the same asset requires re-picking the variable each time.
Confidence: medium — reasoned from standard <select> reset behavior, not runtime-verified.
| export function assetTargets(item: StacItem, key: string, asset: StacAsset): AssetTarget[] { | ||
| if (assetFormat(asset) !== "zarr") return []; | ||
| // An href reaching into the store already names its array; there is nothing left to choose. | ||
| const { path } = zarrStorePath(asset.href); | ||
| if (path) return [{ id: path, label: asset.title || path.split("/").pop() || path }]; | ||
| return zarrTargets(item, key); | ||
| } |
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When an asset's href already points inside the store (the EOPF case this function handles specially), the path it finds isn't necessarily a leaf array — it can be a Zarr group containing several arrays. The eopf-sentinel2.json fixture in this PR includes exactly that: the SR_10m asset's href resolves to measurements/reflectance/r10m, a group holding four band arrays (B02/B03/B04/B08), while the sibling B02_10m asset points at the actual leaf array (.../r10m/b02). canAddAsset/assetTargets will treat SR_10m as addable with a single target equal to the group path, and passing that "variable" to addZarrRasterLayer would presumably fail at the renderer with an unfriendly error rather than the clean messages this PR otherwise provides (addZarrUnreadable/addNoTarget).
This may be an intentional scope cut (multi-band group assets are unusual), but since the exact scenario is present in this PR's own fixture, it's worth confirming what actually happens when a user picks SR_10m and clicks Add.
Confidence: medium — inferred from the fixture data and the STAC/Zarr semantics of a group vs. an array; not runtime-verified.
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Inline comments:
In `@packages/plugins/src/plugins/stac-api.ts`:
- Around line 918-931: Update zarrTargetIsArray to return true for Zarr v3
metadata only when metadata.node_type === "array"; treat missing or unknown
node_type values as false. Add a test covering a zarr.json response without
node_type and verify the target is rejected.
In `@tests/stac-api.test.ts`:
- Around line 1786-1792: Update the test around zarrTargetIsArray to assert that
blocked contains exactly one request after the helper returns false, proving the
rejecting fetch is not retried for another metadata key.
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packages/plugins/src/plugins/maplibre-stac.tspackages/plugins/src/plugins/stac-api.tstests/stac-api.test.ts
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| const layer = layerId | ||
| ? useAppStore.getState().layers.find((entry) => entry.id === layerId) | ||
| : undefined; | ||
| if (layerId && layer) { |
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Minor: addZarrRasterLayer always resolves to a truthy layer id — it throws (if (!addedLayerId) throw ...) rather than ever returning a falsy value — so layerId here is guaranteed truthy once await addZarrRasterLayer(...) resolves. The layerId ? ... : undefined / if (layerId && layer) guards are dead code; layer alone is a sufficient (and clearer) condition.
| const layer = layerId | |
| ? useAppStore.getState().layers.find((entry) => entry.id === layerId) | |
| : undefined; | |
| if (layerId && layer) { | |
| const layer = useAppStore.getState().layers.find((entry) => entry.id === layerId); | |
| if (layer) { |
Confidence: medium-high — based on reading addZarrRasterLayer's implementation in maplibre-components.ts, which throws before returning if addedLayerId is falsy.
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Correct — addZarrRasterLayer throws at maplibre-components.ts:2546 rather than returning falsy. Simplified in 9707f77.
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…nderer makes dead
| const declared = entriesOf(item.properties?.["cube:variables"]); | ||
| const drawable = declared.filter(([, variable]) => { | ||
| const dimensions = variable.dimensions; | ||
| if (!Array.isArray(dimensions)) return false; | ||
| const across = dimensions.map(String).filter((name) => spatial.has(name)); | ||
| if (across.length < 2) return false; | ||
| // The renderer draws a horizontal raster, so two spatial dimensions are not enough on their | ||
| // own — a vertical cross-section spans latitude and depth. Judge by the axes only when every | ||
| // one of them is named, since a partly labelled cube says less than it appears to. | ||
| const axes = across.map((name) => axisOf.get(name) ?? ""); | ||
| if (axes.some((axis) => axis === "")) return true; | ||
| return axes.includes("x") && axes.includes("y"); | ||
| }); |
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Bug (low-medium confidence): this only guards against a variable spanning two non-horizontal spatial axes (e.g. lat+depth), but doesn't reject a variable spanning three or more fully-labeled spatial axes (e.g. lat(y) + lon(x) + depth(z)). Such a variable passes axes.includes("x") && axes.includes("y") and is offered as a drawable target, but neither assetTargets/zarrLayerRequest nor the STAC panel's UI ever build or expose a selector (see ZarrRasterLayerOptions.selector in maplibre-components.ts) — so adding it hands the renderer a 3-D array with no way for the user to pick a depth/level index from this panel.
Non-spatial extra dimensions (e.g. time) are already filtered out correctly since they aren't in the spatial set — this is specifically about a variable that spans more than 2 spatial dimensions.
Concretely: dimensions: ["depth","lat","lon"] with depth/lat/lon all typed spatial and axes z/y/x respectively would be treated the same as a genuine 2-D ["lat","lon"] variable.
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Tested this rather than guessing. Built a (depth, lat, lon) store with all three axes labelled spatial, served it through a local catalog, clicked Add: layer added, drew a slice, no console errors, Zoom to layer flew to the bbox. The renderer defaults the un-selected spatial dimension the same way it defaults time.
So excluding x/y/z variables would hide data that renders. You're right that no selector is exposed — picking a level (or a timestep) is the slice-picker gap, filed separately.
lat + depth is different: no horizontal pair, nothing to place. Excluded, with a test.
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| // one of them is named, since a partly labelled cube says less than it appears to. | ||
| const axes = across.map((name) => axisOf.get(name) ?? ""); | ||
| if (axes.some((axis) => axis === "")) return true; | ||
| return axes.includes("x") && axes.includes("y"); |
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This only requires the labeled axes to include x and y, not to be exactly {x, y}. A variable spanning three fully-labeled spatial dimensions (e.g. lat/lon/depth all present with axis: "y"|"x"|"z") would pass this check and be offered as a drawable 2D target, even though it's actually a 3D volume. Unlike the time dimension — which has dedicated axis-detection/selector machinery elsewhere in maplibre-components.ts — there's no selector computed here for a leftover z axis, so the renderer would fall back to whatever its own default slice is.
This may be an intentional scope limit (real-world datacube catalogs rarely publish true x/y/z volumes as a single 2D-drawable variable), but it isn't covered by the tests, which only exercise the 2-spatial-dimension cases. Confidence: low-medium, since I can't verify @carbonplan/zarr-layer's exact behavior for an un-selected extra dimension.
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Tested this one rather than reasoning about it: built a (depth, lat, lon) store with all three axes labelled spatial, served it through a local catalog and clicked Add. It adds, draws a slice, logs no errors, and Zoom to layer flies to the bbox — the renderer defaults the un-selected spatial dimension the way it defaults time.
So requiring exactly {x, y} would hide data that renders. You're right that no selector is exposed for the leftover axis; choosing a level (or a timestep) is the slice-picker gap, which is a separate feature.
lat + depth with no lon is the case that genuinely can't be placed, and that one is excluded with a test.
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Overall this is a thorough, well-tested change (extensive unit coverage in |
| ## Zarr layers | ||
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| `addZarrLayer` renders a Zarr store (Zarr v2/v3, Icechunk over HTTP, kerchunk-backed cloud NetCDF) through **GeoLibre's own** `@carbonplan/zarr-layer` instance and mirrors the result into the Layers panel. It is the Zarr counterpart of `addCogLayer`. | ||
| `addZarrLayer` renders a Zarr store (Zarr v2/v3 over HTTP, or a kerchunk-backed cloud NetCDF through a custom store) through **GeoLibre's own** `@carbonplan/zarr-layer` instance and mirrors the result into the Layers panel. It is the Zarr counterpart of `addCogLayer`. |
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Quality (medium confidence): This doc now says the plain-url path only reads Zarr v2/v3 over HTTP (Icechunk removed), and ZarrRasterLayerOptions.url's docstring in maplibre-components.ts was updated the same way in this PR. But packages/plugins/src/types.ts (GeoLibreAppAPI.addZarrLayer, ~line 408) still documents that same public API as reading "Zarr v2/v3, Icechunk over HTTP" — and addZarrLayer in usePlugins.ts is a thin wrapper over the very addZarrRasterLayer whose docstring was just narrowed here. That leaves the plugin-facing public type declaration contradicting both this doc and the STAC panel's new explicit refusal of Icechunk assets. Worth updating types.ts in the same pass so external plugin authors aren't told a URL-only Icechunk store will work when it won't.
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Missed that one — fixed in 3220333. GeoLibreAppAPI.addZarrLayer in packages/plugins/src/types.ts now says "Zarr v2/v3 over HTTP" too, so the plugin-facing type, the renderer docstring and the doc all agree.
| // Deliberately unsigned: a store is read key by key, and a token in the URL cannot survive | ||
| // being followed by one. A private container therefore fails the check below and says so. | ||
| const { url } = zarrStorePath(asset.href); | ||
| const checked = await zarrTargetCheck(url, variable, fetch, signal); |
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Performance (low-medium confidence): zarrTargetCheck does its own preflight request(s) for the variable's zarr.json/.zarray/.zgroup before this even calls addZarrRasterLayer — which then has the underlying @carbonplan/zarr-layer control load the store's metadata again to actually render it. Every successful Zarr add therefore does the store-metadata fetch twice. Given this is presumably a deliberate trade-off for a clearer pre-render error message (the renderer's own "error" event carries no structured reason), it may be intentional — but worth confirming, since for a large .zmetadata-consolidated store this doubles a request that isn't free.
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Confirmed intentional. The renderer reports a store it can't read through an event with no structured reason, so without the preflight the panel says "Added…" and leaves a layer that never draws — which is what it did before the check existed. The cost is one to three small metadata requests on click (not per result row), and it buys the group / needs-credentials / unreadable-address / unavailable messages.
Folding validate and open into one call needs the renderer to surface load state, which is upstream in @carbonplan/zarr-layer.
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| /** Icechunk keeps its objects behind a manifest, so the URL-driven Zarr reader cannot open one. */ | ||
| export function isIcechunkAsset(asset: StacAsset): boolean { | ||
| return typeof asset["icechunk:branch"] === "string"; |
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Bugs (low confidence): isIcechunkAsset only looks at asset["icechunk:branch"]. Elsewhere in this same PR (normalizeItem's account resolution), storage-related extension fields are deliberately read from both the asset and the item, on the reasoning that a catalog can publish the field at either level. If some Icechunk-publishing catalog follows the same convention and puts icechunk:branch on item.properties rather than per-asset, such an asset would fall through to the normal Zarr path and fail later with the generic zarrTargetCheck "unavailable"/"group" message instead of the clear "Icechunk stores cannot be read yet" one. Possibly moot if no real catalog does this, but worth double-checking against how Icechunk's STAC extension actually publishes the field.
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Fair symmetry argument — done in 3220333. isIcechunkAsset takes the item as well and checks item.properties["icechunk:branch"], matching how the storage options are read at both levels. canAddAsset and both call sites pass the item; test added, and looking at the asset alone fails it.
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Overall this is a well-scoped, thoroughly tested change (extensive unit tests plus real-catalog fixtures and an e2e spec) with careful handling of STAC/Zarr edge cases (embedded array paths, spatial-dimension detection, CRS resolution, credentials vs. missing-key disambiguation). The findings above are minor consistency/perf notes rather than functional defects. |
| } catch (error) { | ||
| // A blocked or unreachable host fails every key the same way, so stop rather than retry it. | ||
| if (error instanceof DOMException && error.name === "AbortError") throw error; | ||
| return refused ? "unauthorized" : "unavailable"; |
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Possible early bail-out on the first probed key (zarr.json), even when a later key (.zarray/.zgroup) would have succeeded.
The comment justifies this as "a blocked or unreachable host fails every key the same way," but that's not guaranteed for every failure mode this catch swallows. For example, some object-store fronting proxies/CDNs omit CORS headers specifically on 404 responses (a common real-world quirk for S3-compatible backends), which browsers surface as an opaque TypeError: Failed to fetch rather than a resolved 404 response. In that scenario, probing zarr.json on a v2-only store throws (CORS-opaque failure) and the loop returns "unavailable" immediately — never reaching .zarray, which might have succeeded with proper CORS headers on an existing key.
Since v2 stores never have zarr.json (so that first probe is expected to 404/fail on every v2 store), this path could trigger on a meaningful fraction of real v2 catalogs behind such proxies, misreporting a perfectly readable store as "could not be opened."
Confidence: medium — this depends on specific proxy/CDN CORS behavior that isn't exercised by the fixture-backed tests (all synthetic fetchers here throw consistently across keys, so the test suite can't distinguish "throws on some keys" from "throws on all keys").
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You're right, and my comment asserted something I hadn't checked — fixed in e8f6f35.
A thrown request no longer ends the search: it moves to the next key, so a gateway that omits CORS headers on its 404s can't condemn a v2 store by way of the v3 key it never had. A host that rejects every key still reports unavailable, now after trying all three.
Tests cover both — throw-on-zarr.json then .zarray answering, and all three rejecting — and bailing on the first throw fails them.
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| case "zarr": { | ||
| if (!appRef) throw new Error(labels.addFailed); | ||
| if (isIcechunkAsset(asset, item)) throw new Error(labels.addIcechunk); | ||
| const variable = target ?? assetTargets(item, key, asset)[0]?.id; | ||
| if (!variable) throw new Error(labels.addNoTarget); | ||
| // Deliberately unsigned: a store is read key by key, and a token in the URL cannot survive | ||
| // being followed by one. A private container therefore fails the check below and says so. | ||
| const { url } = zarrStorePath(asset.href); | ||
| const checked = await zarrTargetCheck(url, variable, fetch, signal); | ||
| if (checked !== "array") throw new Error(labels.zarrProblem(checked)); |
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Possible gap: Zarr assets from private Planetary Computer-style containers can never be added, even though the app already knows how to sign for them.
readableHref (lines 654-679, just above this switch) exists precisely because "Planetary Computer serves several collections... from private containers that answer 409 without a SAS token" — and 409 is literally one of the UNAUTHORIZED_STATUSES this new Zarr path treats as "unauthorized". Yet the zarr branch never calls readableHref/planetaryComputerSigner; it's "deliberately unsigned" per the comment on line 722.
The PR's own tests/fixtures/stac-items/pc-era5.json fixture is a real Planetary Computer ERA5 Zarr item on Azure blob storage (cpdataeuwest). If that storage account requires a SAS token for anonymous reads (as many PC climate collections do), a real user adding this exact asset would always get "This Zarr store needs credentials GeoLibre cannot supply yet" — even though the app already has the mechanism to mint that token for the same collection.
The stated reason (a URL-embedded token can't survive <store>/<key> appending) is true for a blob-scoped SAS, but Planetary Computer's signUrl(href, collectionId) signs by collection, which suggests a container-scoped SAS — and a container SAS (sr=c) does tolerate extra path segments within that container. Worth confirming whether PC's tokens are actually container-scoped and, if so, whether signing (or passing the token via addZarrRasterLayer's options.headers instead of the URL) would let these assets load instead of always failing as "unauthorized".
Confidence: medium — I can't run this against the live PC API to confirm the container actually requires a token, but the surrounding code strongly suggests this is a real, hit-in-practice gap rather than a hypothetical one.
| export function canAddAsset(item: StacItem, key: string, asset: StacAsset): boolean { | ||
| if (!isVisualizableAsset(asset) || isIcechunkAsset(asset, item)) return false; | ||
| return !requiresTarget(asset) || assetTargets(item, key, asset).length > 0; |
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Minor UX nit: canAddAsset enables Add for any Zarr asset that names a drawable target, but doesn't check zarrStoreTakesKeys. A Zarr href with a query string (a signed URL, ?v=2, etc.) will pass canAddAsset and show an enabled Add button, but always fail at click-time in visualizeAsset with zarrProblem("unsupported-url") once zarrTargetCheck runs — per the test at tests/stac-api.test.ts ("a store that cannot take keys is never asked for one"). Since the outcome is deterministic ahead of time, it might be friendlier to fold a zarrStoreTakesKeys check into canAddAsset (and surface it via addReason) so the button reflects reality instead of always failing after a spinner. Low severity — the failure is still reported clearly, just one click later than it could be.
Confidence: low-medium; this is a UX polish point, not a correctness bug.
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CLAUDE.md
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| /** Whether Add can proceed: a format the panel draws, holding something it can draw. */ | ||
| export function canAddAsset(item: StacItem, key: string, asset: StacAsset): boolean { | ||
| if (!isVisualizableAsset(asset) || isIcechunkAsset(asset, item)) return false; | ||
| return !requiresTarget(asset) || assetTargets(item, key, asset).length > 0; |
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Quality (low-medium confidence): canAddAsset enables Add for any Zarr asset with a valid target, but doesn't account for zarrStoreTakesKeys (a store URL carrying a query string / SAS token, e.g. a signed Azure blob URL). For such an asset the Add button renders enabled with add.title showing the plain asset.href (via addReason), the user clicks Add, and it always fails immediately with "This Zarr store's address cannot be read one key at a time" — the check happens only inside zarrTargetCheck at click time (maplibre-stac.ts line ~725).
This is inconsistent with how the Icechunk case is handled: isIcechunkAsset is checked synchronously here and in addReason, so Icechunk assets get Add disabled up front with an accurate tooltip. Since zarrStoreTakesKeys needs no network call, folding it into canAddAsset (e.g. !requiresTarget(asset) || (assetTargets(...).length > 0 && zarrStoreTakesKeys(zarrStorePath(asset.href).url))) and into addReason would give the same "always disabled, no wasted click" treatment for a signed-URL Zarr asset that the Icechunk path already gets.
Not a functional bug — the error message eventually shown is correct — just a UX/consistency gap worth a look.
Code reviewBugs: None found. Traced the full Zarr STAC flow ( Security: None found. New STAC-catalog-derived strings (asset titles, variable labels) are rendered via Performance: None found. Quality: One inconsistency flagged inline (medium-low confidence) — CLAUDE.md: No violations noted — i18n additions only touch |
| // one of them is named, since a partly labelled cube says less than it appears to. | ||
| const axes = across.map((name) => axisOf.get(name) ?? ""); | ||
| if (axes.some((axis) => axis === "")) return true; | ||
| return axes.includes("x") && axes.includes("y"); |
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Medium confidence: zarrTargets accepts a variable as drawable once its spatial dimensions include both x and y, but it doesn't reject variables that span more than two labelled spatial axes (e.g. x, y, and z all present — a genuine 3D cube such as elevation/atmospheric data with a vertical axis marked type: "spatial", axis: "z"). The across.length < 2 check only rules out fewer than 2 spatial dims, not more.
Such a variable would pass this filter and get added via addZarrRasterLayer with no selector for the extra dimension (the panel never populates one), so the renderer would silently default to an arbitrary index for z rather than exposing a way to choose it — unlike the 2D "vertical cross-section" case (lat+depth) that this function is explicitly written to exclude.
Worth confirming whether this 3-spatial-dim case is intentionally out of scope for this PR, and if so whether it should also be filtered out here (e.g. across.length === 2 instead of < 2) alongside the vertical-cross-section case, so the two are treated consistently.
| return axes.includes("x") && axes.includes("y"); | |
| if (across.length !== 2) return false; |
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Intentional, and tested rather than assumed — same answer as the two earlier threads on this.
I built a (depth, lat, lon) store with all three axes labelled spatial, served it through a local catalog and clicked Add: it adds, draws a slice, logs no errors, and Zoom to layer flies to the bbox. The renderer defaults the un-selected spatial dimension exactly as it defaults time, and (time, y, x) cubes have shipped that way in this PR's demo catalog throughout.
So rejecting three-axis variables would hide data that renders. Choosing which level (or timestep) is the slice-picker gap — a separate feature, and one that wants doing for time as much as for z.
lat + depth is the case that genuinely cannot be placed: no horizontal pair. That one is excluded, with a test.
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giswqs
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@clintonlunn This is a great addition. Thank you for providing the sample catalog. I have uploaded a copy to Source Coop.
https://source.coop/giswqs/opengeos/stac-zarr/catalog.json
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Thanks! Glad to see this go in! |
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Closes #2004.
Adds Zarr to the STAC panel: a row in the format table, a branch in the router, and a second
dropdown to pick which variable to draw. Icechunk is out of scope and is refused with a message.
Demo: connect
https://ubm-assets.geology.utah.gov/examples/stac-zarr/catalog.json, search, Add.NOTE: I made this as a temp demo catalog, but I think maybe it would be better to have a demo catalog that opengeos owns? I had a hard time finding any example data that wasn't locked behind CORS or something else.
Summary by CodeRabbit
New Features
Documentation
Tests