Consolidate tutorials: keep 4 focused pages, archive 6 experiments

Kept:
- isamples_explorer.qmd - Interactive search with faceted filters
- zenodo_isamples_analysis.qmd - Deep-dive DuckDB-WASM tutorial
- parquet_cesium_isamples_wide.qmd - 3D globe (full 6.7M dataset)
- narrow_vs_wide_performance.qmd - Technical schema comparison

Archived to tutorials/archive/:
- parquet_cesium.qmd, parquet_cesium_wide.qmd, parquet_cesium_split.qmd
- oc_parquet_enhanced.qmd, parquet.qmd, parquet_isamples_opencontext.qmd

Updated sidebar navigation, index, README, and fixed cross-references.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: rdhyee

README.md

@@ -17,11 +17,12 @@ Visit the [Quarto site](https://quarto.org/docs/guide/) for documentation on usi
 
 The `tutorials/` directory contains interactive data analysis tutorials:
 
-- **`parquet_cesium.qmd`** - Cesium-based 3D visualization of parquet data
-- **`oc_parquet_enhanced.qmd`** - **NEW**: Enhanced OpenContext property graph analysis with DuckDB-WASM
-- **`zenodo_isamples_analysis.qmd`** - Analysis of Zenodo archived iSamples data
+- **`isamples_explorer.qmd`** - Interactive search and exploration of 6.7M samples
+- **`zenodo_isamples_analysis.qmd`** - Deep-dive DuckDB-WASM analysis tutorial
+- **`parquet_cesium_isamples_wide.qmd`** - Cesium-based 3D globe visualization
+- **`narrow_vs_wide_performance.qmd`** - Technical schema comparison
 
-The enhanced OpenContext tutorial demonstrates browser-based analysis of 11M+ row archaeological datasets using property graph traversal patterns.
+All tutorials use browser-based analysis with DuckDB-WASM - no server required.
 
 ## Development
 

_quarto.yml

@@ -46,23 +46,15 @@ website:
       - text: "Interactive Explorer"
         href: tutorials/isamples_explorer.qmd
         aria-label: "Search and explore 6.7M samples"
-      - section: "Getting Started"
+      - section: "Tutorials"
         contents:
-        - text: "iSamples Tutorials Overview"
+        - text: "Overview"
           href: tutorials/index.qmd
-        - text: "iSamples Parquet Tutorial"
-          href: tutorials/parquet.qmd
-        - text: "Zenodo iSamples OpenContext Tutorial"
+        - text: "Deep-Dive Analysis"
           href: tutorials/zenodo_isamples_analysis.qmd
-        - text: "Cesium View (Narrow)"
-          href: tutorials/parquet_cesium.qmd
-        - text: "Cesium View (Wide - OpenContext)"
-          href: tutorials/parquet_cesium_wide.qmd
-        - text: "Cesium View (Wide - iSamples Full)"
+        - text: "3D Globe Visualization"
           href: tutorials/parquet_cesium_isamples_wide.qmd
-        - text: "Cesium View split sources"
-          href: tutorials/parquet_cesium_split.qmd
-        - text: "Narrow vs Wide Performance"
+        - text: "Technical: Narrow vs Wide"
           href: tutorials/narrow_vs_wide_performance.qmd
 
   repo-url: https://github.com/isamplesorg/isamplesorg.github.io

tutorials/oc_parquet_enhanced.qmd tutorials/archive/oc_parquet_enhanced.qmdtutorials/oc_parquet_enhanced.qmd renamed to tutorials/archive/oc_parquet_enhanced.qmd

@@ -1,41 +1,30 @@
 ---
-title: "Tutorials: Overview"
+title: "Tutorials"
 ---
 
-Welcome to the iSamples tutorials! These tutorials demonstrate how to work with sample data using modern browser-based tools and geoparquet files.
+Learn to explore **6.7 million physical samples** from scientific collections worldwide using modern browser-based tools.
 
-## Available Data Sources
+## Start Here
 
-With iSamples Central currently unavailable, all tutorials now use **geoparquet files** as the primary data source:
+| Tutorial | What You'll Learn |
+|----------|-------------------|
+| [**Interactive Explorer**](isamples_explorer.qmd) | Search and filter samples with faceted search, view on 3D globe |
+| [**Deep-Dive Analysis**](zenodo_isamples_analysis.qmd) | Comprehensive DuckDB-WASM analysis with Observable JS |
+| [**3D Globe Visualization**](parquet_cesium_isamples_wide.qmd) | Cesium-based visualization of all iSamples data |
+| [**Technical: Narrow vs Wide**](narrow_vs_wide_performance.qmd) | Schema comparison and performance benchmarks |
 
-### Primary Data Sources
-- **Zenodo Complete Dataset**: ~300MB, 6+ million records from all iSamples sources
-- **OpenContext Parquet**: Curated archaeological sample data
-- **Domain-specific Collections**: Specialized datasets for focused analysis
+## Data Sources
 
-### Tutorial Categories
+All tutorials use **geoparquet files** - no server required:
 
-**🗺️ Geographic Analysis**
-- Interactive mapping and spatial exploration
-- Regional distribution analysis
-- Cesium-based 3D visualizations
+- **iSamples Full Dataset**: 282 MB, 6.7M samples from SESAR, OpenContext, GEOME, Smithsonian
+- **Available via**: Cloudflare R2 with HTTP range requests
 
-**📊 Data Analysis**
-- Statistical analysis with DuckDB-WASM
-- Material category distributions
-- Cross-collection comparisons
+## Why Browser-Based?
 
-**🚀 Performance Demonstrations**
-- Browser-based big data analysis
-- Efficient sampling and visualization techniques
-- HTTP range request optimization
+Our approach using **geoparquet + DuckDB-WASM** provides:
 
-## Why Geoparquet?
-
-Our tutorials showcase how **geoparquet + DuckDB-WASM** enables:
-
-- ✅ **Universal access**: No software installation required
-- ✅ **Fast analysis**: 5-10x faster than traditional approaches (e.g., downloading full CSV datasets and analyzing them locally). [See benchmark](https://duckdb.org/2023/05/10/duckdb-wasm.html)
-- ✅ **Memory efficient**: Analyze 300MB datasets using <100MB browser memory
-- ✅ **Minimal data transfer**: Only download what you need
-- ✅ **Interactive exploration**: Real-time parameter adjustment
+- ✅ **Universal access** - No installation, works in any browser
+- ✅ **Fast analysis** - 5-10x faster than downloading full datasets
+- ✅ **Memory efficient** - Analyze 300MB using <100MB browser memory
+- ✅ **Minimal transfer** - Only download the columns/rows you need

tutorials/parquet.qmd tutorials/archive/parquet.qmdtutorials/parquet.qmd renamed to tutorials/archive/parquet.qmd

@@ -740,5 +740,6 @@ This eliminates ~9M edge rows, resulting in the 60% file size reduction.
 
 ## See Also
 
-- [OpenContext Parquet Analysis](oc_parquet_enhanced.qmd) - Deep dive into the property graph structure
-- [Cesium Visualization](parquet_cesium.qmd) - Interactive 3D visualization of sample locations
+- [Interactive Explorer](isamples_explorer.qmd) - Search and filter samples
+- [3D Globe Visualization](parquet_cesium_isamples_wide.qmd) - Cesium-based visualization of all data
+- [Deep-Dive Analysis](zenodo_isamples_analysis.qmd) - Comprehensive DuckDB-WASM tutorial