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docs: update README for the Log Plot, Crossplot, and channel-role features

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Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Manoj K
2026-06-02 15:57:44 +05:30
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README.md
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@@ -1,22 +1,43 @@
# LAS Stream Viewer # LAS Stream Viewer
Stream very large (10 GB+) LAS well-log files **line by line** in the browser. A Java 21 / A drilling-data viewer for **very large (10 GB+) LAS well-log files**. A Java 21 / Quarkus backend
Quarkus backend indexes and streams the file with a constant, tiny memory footprint; a React + indexes the file in a single streaming pass (constant, tiny memory footprint); a React + Vite UI
Vite UI renders millions of lines via virtualization and plays them back as a live SSE stream. presents the data three ways:
Built for the Pason-style LAS 2.0 logs in `Desktop\LAS files` (up to ~12.5 GB, 426 curves, - **📈 Log Plot** — a multi-track drilling strip-chart / log plot (the way an engineer reads a well).
~2.5 M rows). Nothing about the design assumes the file fits in memory. - **⊕ Crossplot** — WOB-vs-ROP (and any X/Y) drilling-optimization scatter, colored by depth/time.
- **𝍌 Raw / QC** — line-by-line virtualized view with live SSE streaming and whole-file search.
Built for the Pason-style LAS 2.0 logs in `Desktop\LAS files` (up to ~12.5 GB, ~426 curves,
~2.5 M rows). Nothing in the design assumes the file fits in memory.
## Why it scales ## Why it scales
| Concern | Approach | | Concern | Approach |
|---|---| |---|---|
| Open a 12.5 GB file | **Open-in-place** (no copy) — or resumable chunked upload for remote files | | Open a 12.5 GB file | **Open-in-place** (no copy) — or resumable 16 MiB chunked upload |
| Random access into the file | One-pass **sparse byte-offset index** (a checkpoint every 256 lines ≈ 80 KB for 2.5 M lines) | | Random line access | One-pass **sparse byte-offset index** (a checkpoint every 256 lines ≈ 80 KB for 2.5 M lines) |
| Indexing memory | Single streaming pass, 1 MiB buffer — independent of file size | | Curve plots over millions of samples | **Pyramid** of min/max **and mean** built per 32-row bucket during the same pass |
| Streaming memory | One `BufferedReader` advanced sequentially; lines pushed over **SSE** with backpressure | | Honest decimation | **min/max per pixel, never averaging** — a 2 s gas kick or torque spike survives when zoomed out |
| Browser memory | Virtualized list (only visible rows in the DOM) + a capped (20 K-line) LRU cache | | Indexing memory | Single streaming pass, 1 MiB buffer + tiny index + tens-of-MB pyramid — independent of file size |
| Reading a line range | Seek to nearest checkpoint, skip ≤ 255 lines — effectively O(1) | | Raw streaming | One `BufferedReader` advanced sequentially; lines pushed over **SSE** with backpressure |
| Browser memory | Virtualized line list + capped (20 K-line) cache; plots fetch only the visible window, decimated |
## Drilling features
- **Channel-role resolver** maps the ~426 raw Pason mnemonics to drilling roles (ROP, WOB, RPM,
torque, MSE, SPP, flow, total gas + C1–C5, gamma, inclination/azimuth, stick-slip/vibration, pit
gain-loss, on-bottom, …) with sensible **physical default scales** so sensor-glitch spikes clip
instead of flattening the trace.
- **Log Plot**: index vertical (depth **or** time, with a toggle), value horizontal in side-by-side
tracks; min/max envelope + mid trace; **scrollbar** + wheel-zoom + Fit to navigate; **auto-fit**
(scale each track to the visible window); hover **crosshair + readout**; **curve picker** to
customize tracks; **EDR-style replay** (curves scroll like a rig strip-chart); **Σ Stats** panel
(min/avg/max per channel over the window).
- **Crossplot**: bucket-mean X vs Y (default WOB vs ROP) colored by depth/time/channel, **on-bottom
only** filter, robust (1st–99th pct) auto-ranges so outliers don't blow up the axes, colorbar, hover.
- **Robust axes/depth**: hole-depth is jump-capped so one garbage `DEPT` sample can't poison the
depth axis; an axis is only offered when its real extent is non-degenerate.
## Layout ## Layout
@@ -26,11 +47,15 @@ las-stream-viewer/
├─ run.ps1 dev: Vite (:5173) + Quarkus (:8090) ├─ run.ps1 dev: Vite (:5173) + Quarkus (:8090)
├─ build.ps1 prod: bundle UI into the jar, serve on :8090 ├─ build.ps1 prod: bundle UI into the jar, serve on :8090
├─ src/main/java/com/oiusa/las/ ├─ src/main/java/com/oiusa/las/
│ ├─ model/ LasFile, Curve, HeaderSection │ ├─ model/ LasFile, Curve, HeaderSection, ResolvedRole
│ ├─ index/ LineIndex (sparse offsets), LineReader (random access) │ ├─ index/ LineIndex (sparse offsets), LineReader, Pyramid (min/max/mean overview), RowParser
│ ├─ service/ FileStore, IndexService (one-pass scan), LasHeaderParser, UploadService │ ├─ service/ FileStore, IndexService (one-pass index+pyramid), LasHeaderParser,
│ └─ web/ File / Lines / Stream(SSE) / Search(SSE) / Upload resources │ │ ChannelRoles (role mapping), CurveDataService (decimation/crossplot), UploadService
└─ frontend/ React + Vite + TS, @tanstack/react-virtual │ └─ web/ File / Lines / Stream(SSE) / Search(SSE) / Upload / Curve (roles, curve-data, crossplot)
└─ frontend/src/
├─ components/ App, IngestPanel, FileList, Section, WellInfo, ChannelList,
│ HeaderPanel, Viewer (raw), LogPlot, Crossplot
└─ api.ts, types.ts, las.ts, styles.css
``` ```
## Run (dev) ## Run (dev)
@@ -40,18 +65,16 @@ cd C:\Users\Dell\Desktop\las-stream-viewer
.\run.ps1 .\run.ps1
``` ```
This installs UI deps on first run, starts Vite in a new window, and runs the Quarkus dev server. Installs UI deps on first run, starts Vite in a new window, runs the Quarkus dev server.
Open **http://localhost:5173**. Open **http://localhost:5173**.
To run the pieces by hand: By hand:
```powershell ```powershell
# backend
$env:JAVA_HOME="C:\Program Files\Java\jdk-21.0.11" $env:JAVA_HOME="C:\Program Files\Java\jdk-21.0.11"
$mvn = "C:\Users\Dell\.m2\wrapper\dists\apache-maven-3.9.9-bin\4nf9hui3q3djbarqar9g711ggc\apache-maven-3.9.9\bin\mvn.cmd" $mvn = "C:\Users\Dell\.m2\wrapper\dists\apache-maven-3.9.9-bin\4nf9hui3q3djbarqar9g711ggc\apache-maven-3.9.9\bin\mvn.cmd"
& $mvn quarkus:dev & $mvn quarkus:dev # backend :8090
# frontend (separate window) cd frontend; npm install; npm run dev # frontend :5173 (separate window)
cd frontend; npm install; npm run dev
``` ```
## Run (production, single port) ## Run (production, single port)
@@ -65,22 +88,34 @@ java -jar target\quarkus-app\quarkus-run.jar
## Using it ## Using it
1. **Open on disk** — browse the server filesystem (constrained to `las.allowed-roots`, default your 1. **Open a file** (left panel): **Open on disk** browses the server filesystem (constrained to
home dir) and click a `.las` file. It opens in place; indexing starts immediately and the header `las.allowed-roots`) and opens a `.las` **in place, no copy** — ideal for the multi-GB logs.
appears as soon as it's parsed. Or **Upload** to stream a file in 16 MiB chunks. Indexing + the curve overview build in the
2. **Upload** — drag a file in; it's streamed to the server in 16 MiB chunks. background; the well info and channels appear in the sidebar as soon as the header is parsed.
3. Watch the **LAS header** (version/well/curve metadata) populate in the sidebar. 2. **📈 Log Plot** — scroll the scrollbar (or wheel-zoom / Fit) through depth or time, hover for a
4. In the viewer: **▶ Stream** plays lines server-side over SSE (speed slider = lines/sec), scroll readout, **▶ Replay** to animate, toggle **auto-fit** and **Σ Stats**, add channels via **＋ Curves**.
freely through all lines (ranges fetched on demand), jump to **Top / Data / End** or any line, 3. **⊕ Crossplot** — pick X/Y/Color, toggle **on-bottom only** for a clean founder-point view.
and **Search** the whole file (streamed matches, click to jump). 4. **𝍌 Raw / QC** — stream the raw lines (speed slider), jump to Top/Data/End/any line, search the
whole file. Good for verifying export integrity (column alignment, NULLs, etc.).
Collapse the left panel with the **⮜** button in the top bar for a bigger workspace.
## Notes & caveats
- The channel→role mapping is auto-resolved from mnemonics; verify with the **＋ Curves** picker and
swap channels if a mapping looks off for your file.
- Data quality is the data's own: some exports have broken channels (e.g. a stuck `DEPT`), in which
case that axis is suppressed and the **Raw / QC** tab is the place to confirm. Sensor-glitch spikes
are handled by fixed physical scales (Log Plot) and robust percentile ranges (Crossplot).
- First index of a 12.5 GB file takes a few minutes (it parses ~40 channels/row for the pyramid);
shown with a progress bar. Smaller logs index in seconds.
## Configuration (`src/main/resources/application.properties`) ## Configuration (`src/main/resources/application.properties`)
| Key | Default | Notes | | Key | Default | Notes |
|---|---|---| |---|---|---|
| `quarkus.http.port` | `8090` | API (and prod UI) port | | `quarkus.http.port` | `8090` | API (and prod UI) port |
| `las.data-dir` | `${user.home}/.las-stream-viewer` | where uploads live | | `las.data-dir` | `${user.home}/.las-stream-viewer` | where uploaded files live |
| `las.allowed-roots` | `${user.home}` | local files may only be opened from under these roots | | `las.allowed-roots` | `${user.home}` | local files may only be opened from under these roots |
| `las.index-stride` | `256` | lines per index checkpoint (smaller = faster seeks, larger index) | | `las.index-stride` | `256` | lines per index checkpoint (smaller = faster seeks, larger index) |
| `las.upload-chunk-size` | `16777216` | upload chunk size hint (16 MiB) | | `las.upload-chunk-size` | `16777216` | upload chunk size hint (16 MiB) |
```