### Install SpatialVista from source

Source: https://jianyang-lab.github.io/spatial-vista-py/quickstart

Clones the repository and installs the package in editable mode using uv. Use this to get the latest development version.

```bash
git clone https://github.com/JianYang-Lab/spatial-vista-py.git
cd spatial-vista-py
uv pip install -e .

```

--------------------------------

### Minimal Jupyter example with FakeAnnData

Source: https://jianyang-lab.github.io/spatial-vista-py/quickstart

Verifies the installation by creating a minimal test AnnData-like object and visualizing it with spv.vis. If you see an interactive visualization, the installation is successful.

```python
import numpy as np
import spatialvista as spv

# Create minimal test data
class FakeAnnData:
    def __init__(self, n: int):
        self.obsm = {"spatial": np.random.rand(n, 3)}
        self.obs = {"celltype": np.random.choice(["A", "B", "C"], n)}
        self.var_names = []
        self.X = None
        self.n_obs = n

adata = FakeAnnData(n=10_000)

# Create visualization
spv.vis(adata, position="spatial", color="celltype")

```

--------------------------------

### Install SpatialVista

Source: https://jianyang-lab.github.io/spatial-vista-py?q=

Install the package using pip.

```bash
pip install spatialvista
```

--------------------------------

### Install SpatialVista with uv

Source: https://jianyang-lab.github.io/spatial-vista-py/quickstart

Installs the spatialvista package using uv. Requires Python 3.10 or higher.

```bash
uv pip install spatialvista

```

--------------------------------

### Install and run SpatialVista command

Source: https://jianyang-lab.github.io/spatial-vista-py/cli?q=

Installs SpatialVista via pip and runs it with the --input flag. The server listens at http://127.0.0.1:8765 and opens a browser automatically; stop with Ctrl+C.

```bash
pip install spatialvista
spatialvista --input data.h5ad
```

--------------------------------

### Open .h5ad file from command line

Source: https://jianyang-lab.github.io/spatial-vista-py/quickstart

Launches SpatialVista with the specified .h5ad file. It infers common obsm spatial keys and categorical obs columns, starts at http://127.0.0.1:8765, and opens the browser.

```bash
spatialvista --input data.h5ad

```

--------------------------------

### Install SpatialVista with pip

Source: https://jianyang-lab.github.io/spatial-vista-py/quickstart

Installs the spatialvista package using pip. Requires Python 3.10 or higher.

```bash
pip install spatialvista

```

--------------------------------

### SpatialVista data options example

Source: https://jianyang-lab.github.io/spatial-vista-py/cli?q=

Sets explicit coordinate, annotation, section, and layer options for reproducible commands. List options can be repeated or comma-separated.

```bash
spatialvista --input sample.h5ad \
  --position spatial \
  --color celltype \
  --section slice_id \
  --annotations leiden,tissue_region \
  --continuous total_counts,n_genes_by_counts \
  --genes PECAM1,CD3E \
  --layer normalized
```

--------------------------------

### Run SpatialVista without installing using uvx

Source: https://jianyang-lab.github.io/spatial-vista-py/quickstart

Runs SpatialVista directly with uvx, without permanent installation. The --input flag specifies the .h5ad file.

```bash
uvx spatialvista --input data.h5ad

```

--------------------------------

### Set the logging level

Source: https://jianyang-lab.github.io/spatial-vista-py/api

Examples of setting different logging levels for the spatialvista package.

```python
>>> import spatialvista as spv
>>> spv.set_log_level("INFO")  # Show info and above
>>> spv.set_log_level("DEBUG")  # Show debug and above
>>> spv.set_log_level("ERROR")  # Only show errors
```

--------------------------------

### get_logger()

Source: https://jianyang-lab.github.io/spatial-vista-py/api

Get the configured logger instance used by the spatialvista package.

```APIDOC
## get_logger()

### Description
Get the configured logger instance.

### Returns
- **logger** - The configured loguru logger instance.
```

--------------------------------

### get_log_level()

Source: https://jianyang-lab.github.io/spatial-vista-py/api

Get the current logging level of the spatialvista package.

```APIDOC
## get_log_level()

### Description
Get the current logging level.

### Returns
- **str** - The current log level (e.g., "WARNING", "INFO").
```

--------------------------------

### Fix spatialvista import in Jupyter: check kernel, install, create kernel

Source: https://jianyang-lab.github.io/spatial-vista-py/faq?q=

Diagnose and fix a Jupyter kernel environment issue where spatialvista cannot be imported. The first block checks which Python the kernel uses and whether spatialvista is installed; the second installs it in the correct environment (pip or uv); the third creates a new kernel named 'myenv' for the environment. Use these in order when the package is missing from the active kernel.

```python
# Check which Python your kernel is using
import sys
print(sys.executable)

# Check if spatialvista is installed in this environment
import subprocess
subprocess.run([sys.executable, "-m", "pip", "list"])

```

```bash
# Install in the same environment as your Jupyter kernel
python -m pip install spatialvista

# Or with uv
uv pip install spatialvista

```

```bash
# Activate your environment first, then:
python -m ipykernel install --user --name=myenv --display-name="Python (myenv)"

```

--------------------------------

### Create a SpatialVista visualization widget

Source: https://jianyang-lab.github.io/spatial-vista-py/api

Demonstrates basic usage of the vis function and how to enable logging for the visualization process.

```python
>>> import spatialvista as spv
>>>
>>> # Basic usage
>>> widget = spv.vis(adata, position="spatial", color="region")
>>>
>>> # With logging enabled
>>> spv.set_log_level("INFO")
>>> widget = spv.vis(adata, position="spatial", color="region")
```

--------------------------------

### SpatialVista server options

Source: https://jianyang-lab.github.io/spatial-vista-py/cli?q=

Lists server configuration flags: --host, --port, --no-browser, --mode, and --height. The default loopback address keeps the server local; binding another host can expose data over a network.

```bash
--host HOST       Listening interface (default: 127.0.0.1)
--port PORT       Listening port (default: 8765; use 0 for an available port)
--no-browser      Do not open the browser automatically
--mode {2D,3D}    Initial visualization mode
--height HEIGHT   Visualization height in pixels
```

--------------------------------

### Run SpatialVista with uvx

Source: https://jianyang-lab.github.io/spatial-vista-py/cli?q=

Launches SpatialVista in an isolated environment using uvx, opening the specified .h5ad file in a browser.

```bash
uvx spatialvista --input data.h5ad
```

--------------------------------

### Good practice for incremental widget loading

Source: https://jianyang-lab.github.io/spatial-vista-py/faq?q=

Load data in steps by reloading the widget with specific parameters to keep transfer sizes and memory usage low.

```python
# Step 1: Start with basics
widget = spv.vis(
    adata,
    position="spatial",
    color="celltype",
    annotations=["leiden"]  # Just 1-2 extra annotations
)

# Step 2: Later, reload with genes
widget = spv.vis(
    adata,
    position="spatial",
    color="celltype",
    genes=["Gene1", "Gene2", "Gene3"]  # Just a few genes
)

# Step 3: Or reload with continuous values
widget = spv.vis(
    adata,
    position="spatial",
    color="celltype",
    continuous=["total_counts", "n_genes"]  # Just key QC metrics
)
```

--------------------------------

### Open .h5ad file with explicit keys

Source: https://jianyang-lab.github.io/spatial-vista-py/quickstart

Specifies custom keys for position, color, section, annotations, continuous values, and genes. Use this when your file uses different names than the inferred defaults.

```bash
spatialvista --input data.h5ad \
  --position spatial \
  --color celltype \
  --section section \
  --annotations leiden,region \
  --continuous total_counts \
  --genes Pecam1,Cd3e

```

--------------------------------

### Good practice: incremental loading with spv.vis

Source: https://jianyang-lab.github.io/spatial-vista-py/faq

Loads only a few annotations, genes, or continuous values initially, then reloads with new parameters. Reloading is fast; recommended limits are 3-5 annotations, 5-10 genes, and 3-5 continuous values per widget.

```python
# Step 1: Start with basics
widget = spv.vis(
    adata,
    position="spatial",
    color="celltype",
    annotations=["leiden"]  # Just 1-2 extra annotations
)

# Step 2: Later, reload with genes
widget = spv.vis(
    adata,
    position="spatial",
    color="celltype",
    genes=["Gene1", "Gene2", "Gene3"]  # Just a few genes
)

# Step 3: Or reload with continuous values
widget = spv.vis(
    adata,
    position="spatial",
    color="celltype",
    continuous=["total_counts", "n_genes"]  # Just key QC metrics
)

```

--------------------------------

### Visualize Categorical Annotations

Source: https://jianyang-lab.github.io/spatial-vista-py?q=

Load additional categorical annotations for coloring and exploration.

```python
# Color by cell type
widget = spv.vis(
    adata,
    position="spatial",
    color="celltype",
    annotations=["leiden", "tissue_region"]  # Additional annotations to load
)
```

--------------------------------

### Bad practice for widget loading

Source: https://jianyang-lab.github.io/spatial-vista-py/faq?q=

Loading too many annotations and genes at once can cause slow performance and browser freezes.

```python
# This loads 50+ annotations + 100 genes = very slow!
widget = spv.vis(
    adata,
    position="spatial",
    color="celltype",
    annotations=list(adata.obs.columns),  # ❌ All annotations
    genes=list(adata.var_names[:100])     # ❌ 100 genes
)
```

--------------------------------

### vis(adata, position, color, section=None, annotations=None, continuous=None, genes=None, layer=None, height=600, mode='3D', _async_workers=2, _wait_for_all_sends=False)

Source: https://jianyang-lab.github.io/spatial-vista-py/api

Create and return a SpatialVista visualization widget. This is the primary entry point for generating interactive spatial visualizations from AnnData objects.

```APIDOC
## vis(adata, position, color, section=None, annotations=None, continuous=None, genes=None, layer=None, height=600, mode='3D', _async_workers=2, _wait_for_all_sends=False)

### Description
Create and return a SpatialVista visualization widget. If _wait_for_all_sends is True, the function will block until all background sends finish. Otherwise it will return the widget immediately while sends may continue in background.

### Parameters
- **adata** (AnnData) - Required - Annotated data object containing spatial information.
- **position** (str) - Required - Key in adata.obsm containing spatial coordinates.
- **color** (str) - Required - Key in adata.obs for default categorical coloring.
- **section** (str) - Optional - Annotation key for section slicing (only relevant when mode="3D" and switching to 2D slice view in UI). Ignored when mode="2D". Default: None
- **annotations** (list[str]) - Optional - List of additional categorical annotation keys to export. Default: None
- **continuous** (list[str]) - Optional - List of continuous observation keys to export. Default: None
- **genes** (list[str]) - Optional - List of gene names to export. Default: None
- **layer** (str) - Optional - Layer to use for gene expression values. If None, uses adata.X. Default: None
- **height** (int) - Optional - Height of the widget in pixels. Default: 600
- **mode** (str) - Optional - Visualization mode. "3D" for 3D point cloud, "2D" for 2D projection (z=0). Default: "3D"
- **_async_workers** (int) - Optional - Number of background workers for async trait sends. Default: 2
- **_wait_for_all_sends** (bool) - Optional - Whether to wait for all background sends to complete before returning. Default: False

### Returns
- **SpatialVistaWidget** - The configured widget ready for display.

### Examples
```python
>>> import spatialvista as spv
>>>
>>> # Basic usage
>>> widget = spv.vis(adata, position="spatial", color="region")
>>>
>>> # With logging enabled
>>> spv.set_log_level("INFO")
>>> widget = spv.vis(adata, position="spatial", color="region")
```
```

--------------------------------

### Access and apply alignment parameters

Source: https://jianyang-lab.github.io/spatial-vista-py/api

Shows how to retrieve alignment parameters from a widget and apply them to the AnnData object.

```python
widget.alignment_parameters
aligned = widget.apply_alignment(output_key="spatial_aligned")
```

--------------------------------

### Enable detailed logging with spv.set_log_level

Source: https://jianyang-lab.github.io/spatial-vista-py/faq?q=

Enables detailed logging for debugging data loading issues. Use INFO to see data transfer progress or DEBUG to see everything, then create a visualization widget with spv.vis.

```python
import spatialvista as spv

spv.set_log_level("INFO")  # See data transfer progress
# or
spv.set_log_level("DEBUG")  # See everything

widget = spv.vis(adata, position="spatial", color="celltype")

```

--------------------------------

### Visualize Continuous Values

Source: https://jianyang-lab.github.io/spatial-vista-py?q=

Include continuous value fields such as QC metrics for visualization.

```python
# Visualize continuous values (e.g., QC metrics)
widget = spv.vis(
    adata,
    position="spatial",
    color="celltype",
    continuous=["total_counts", "n_genes"]  # Continuous value fields
)
```

--------------------------------

### Basic Usage of SpatialVista

Source: https://jianyang-lab.github.io/spatial-vista-py?q=

Load spatial transcriptomics data from an h5ad file and initialize the interactive visualization widget.

```python
import spatialvista as spv
import scanpy as sc

# Load spatial transcriptomics data
adata = sc.read_h5ad("spatial_data.h5ad")

# Create interactive visualization
widget = spv.vis(
    adata,
    position="spatial",  # obsm key containing spatial coordinates
    color="celltype",    # Default annotation for coloring
    height=600               # Widget height in pixels
)

# Display widget
widget
```

--------------------------------

### Bad practice: loading all annotations and genes with spv.vis

Source: https://jianyang-lab.github.io/spatial-vista-py/faq

Loads all annotations and 100 genes, causing slow transfer and high memory usage. Avoid this pattern; it is labeled as bad practice.

```python
# This loads 50+ annotations + 100 genes = very slow!
widget = spv.vis(
    adata,
    position="spatial",
    color="celltype",
    annotations=list(adata.obs.columns),  # ❌ All annotations
    genes=list(adata.var_names[:100])     # ❌ 100 genes
)

```

--------------------------------

### Enable 2D/3D View Switching

Source: https://jianyang-lab.github.io/spatial-vista-py?q=

Provide a section identifier field to enable section browser controls and 2D view switching.

```python
# If data has section information, switch to 2D view in UI
widget = spv.vis(
    adata,
    position="spatial",
    color="celltype",
    section="slice_id",  # Section identifier field for section browser
)
```

--------------------------------

### Check coordinate bounds for LAZ transformation

Source: https://jianyang-lab.github.io/spatial-vista-py/faq

Check the original coordinate bounds before SpatialVista's LAZ transformation. The minimum and maximum values become the offset and are used to calculate the scale for integer compression.

```python
# Your original coordinates
print(adata.obsm["spatial"].min(axis=0))  # [min_x, min_y, min_z]
print(adata.obsm["spatial"].max(axis=0))  # [max_x, max_y, max_z]

# These become the offset and are used to calculate scale
```

--------------------------------

### widget.apply_alignment(output_key="spatial_aligned")

Source: https://jianyang-lab.github.io/spatial-vista-py/api

Materialize the latest frontend alignment parameters into the AnnData object. This method is exposed on the widget returned by vis() when section is used.

```APIDOC
## widget.apply_alignment(output_key="spatial_aligned")

### Description
Materialize the latest frontend alignment parameters into AnnData. Returns an (n_obs, 3) NumPy array and stores the same array in the source adata.obsm mapping.

### Parameters
- **output_key** (str) - Optional - Key in adata.obsm where the aligned coordinates will be stored. Default: "spatial_aligned"

### Returns
- **numpy.ndarray** - An (n_obs, 3) NumPy array containing the aligned spatial coordinates.

### Usage Example
```python
widget.alignment_parameters
aligned = widget.apply_alignment(output_key="spatial_aligned")
```
```

--------------------------------

### Downsample dataset for memory management

Source: https://jianyang-lab.github.io/spatial-vista-py/faq?q=

Use Scanpy's subsample function to reduce the number of cells before passing the data to the visualization widget.

```python
import scanpy as sc

# Option 1: Keep a fraction
sc.pp.subsample(adata, fraction=0.5)  # 50% of cells

# Option 2: Keep exact number
sc.pp.subsample(adata, n_obs=100000)  # 100k cells

# Then visualize
widget = spv.vis(adata, position="spatial", color="celltype")
```

--------------------------------

### Update SpatialVista

Source: https://jianyang-lab.github.io/spatial-vista-py/quickstart

Updates the spatialvista package to the latest version using either uv or pip.

```bash
uv pip install --upgrade spatialvista
# or
pip install --upgrade spatialvista

```

--------------------------------

### Check original coordinates for LAZ transformation

Source: https://jianyang-lab.github.io/spatial-vista-py/faq?q=

Inspect the original spatial coordinates before SpatialVista's LAZ transformation. The min and max values become the offset and are used to calculate the scale. Use this to verify the coordinate range and understand the quantization effect.

```python
# Your original coordinates
print(adata.obsm["spatial"].min(axis=0))  # [min_x, min_y, min_z]
print(adata.obsm["spatial"].max(axis=0))  # [max_x, max_y, max_z]

# These become the offset and are used to calculate scale

```

--------------------------------

### Synchronize alignment parameters and apply alignment in Jupyter

Source: https://jianyang-lab.github.io/spatial-vista-py/controls?q=

In Jupyter, these commands synchronize the alignment parameters to the widget and apply the alignment, writing aligned 3D coordinates to adata.obsm["spatial_aligned"].

```python
widget.alignment_parameters
widget.apply_alignment(output_key="spatial_aligned")
```

--------------------------------

### set_log_level(level='WARNING')

Source: https://jianyang-lab.github.io/spatial-vista-py/api

Set the logging level for the spatialvista package. This controls the verbosity of log messages emitted by the library.

```APIDOC
## set_log_level(level='WARNING')

### Description
Set the logging level for the spatialvista package.

### Parameters
- **level** (str) - Optional - The logging level. Valid values are: "TRACE", "DEBUG", "INFO", "SUCCESS", "WARNING", "ERROR", "CRITICAL". Default: "WARNING"

### Raises
- **ValueError** - If an invalid log level is provided.

### Examples
```python
>>> import spatialvista as spv
>>> spv.set_log_level("INFO")  # Show info and above
>>> spv.set_log_level("DEBUG")  # Show debug and above
>>> spv.set_log_level("ERROR")  # Only show errors
```
```

--------------------------------

### Downsample large dataset with sc.pp.subsample before spv.vis

Source: https://jianyang-lab.github.io/spatial-vista-py/faq

Downsamples the AnnData object before visualization to avoid memory errors. Use either a fraction (e.g., 0.5 for 50% of cells) or an exact number of observations (e.g., 100000).

```python
import scanpy as sc

# Option 1: Keep a fraction
sc.pp.subsample(adata, fraction=0.5)  # 50% of cells

# Option 2: Keep exact number
sc.pp.subsample(adata, n_obs=100000)  # 100k cells

# Then visualize
widget = spv.vis(adata, position="spatial", color="celltype")

```

--------------------------------

### Disable logging with spv.disable_logging

Source: https://jianyang-lab.github.io/spatial-vista-py/faq?q=

Disables logging entirely or sets the log level to ERROR so only errors are shown.

```python
spv.disable_logging()
# or
spv.set_log_level("ERROR")  # Only show errors

```

--------------------------------

### Visualize Gene Expression

Source: https://jianyang-lab.github.io/spatial-vista-py?q=

Specify a list of genes to visualize their spatial expression patterns, optionally using a specific data layer.

```python
# View expression patterns of specific genes
widget = spv.vis(
    adata,
    position="spatial",
    color="celltype",
    genes=["Pecam1", "Cd3e", "Epcam"],  # Gene list
    layer="normalized"  # Optional: use specific layer if available
)
```

--------------------------------

### Fix KeyError for position/annotation keys in spv.vis

Source: https://jianyang-lab.github.io/spatial-vista-py/faq?q=

Resolve a KeyError when the specified position or annotation key does not exist in the data. The first lines list the available keys in adata.obsm and adata.obs; the last line shows how to pass the correct keys to spv.vis.

```python
# Check available keys
print("Position keys:", adata.obsm.keys())
print("Annotation keys:", adata.obs.columns.tolist())

# Use correct keys
widget = spv.vis(adata, position="your_actual_key", color="your_annotation")

```

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