Slope Percentage Module¶

File: computing/misc/slope_percentage.py

Overview¶

This module generates slope percentage raster layers by clipping pan-India slope data to specific block boundaries. Slope percentage is critical for land use planning, erosion assessment, and watershed management.

Purpose¶

Processes slope gradient data for: - Agricultural suitability analysis - Erosion risk assessment - Infrastructure planning - Distributes to GEE, GeoServer (via GCS), and database

Architecture¶

flowchart TD
    A[Celery Task Triggered] --> B[ee_initialize]
    B --> C[Build Description & Asset ID]
    C --> D[Load MWS ROI]
    D --> E[Load Pan-India Slope Raster]
    E --> F[Clip to ROI]
    F --> G[Call Raster Generation Function]
    G --> H{Asset Exists?}
    H -->|No| I[Export Raster to GEE]
    I --> J[Check Task Status]
    J --> K[Sync to GCS]
    K --> L[Sync GCS to GeoServer]
    L --> M[save_layer_info_to_db]
    M --> N[make_asset_public]
    N --> O{Success?}
    O -->|Yes| P[Update Sync Status]
    P --> Q[Return True]
    H -->|Yes| R[Skip Export]
    R --> K

Components¶

Main Task: generate_slope_percentage_data()¶

Location: Line 19

Parameters: | Parameter | Type | Description | |-----------|------|-------------| | state | str | State name | | district | str | District name | | block | str | Block/tehsil name | | gee_account_id | int | GEE account identifier |

Returns: bool - Whether layer was successfully synced to GeoServer

Helper Function: slope_percentage_raster_generation()¶

Location: Line 44

Handles the raster export and synchronization logic.

Processing Logic¶

1. ROI Definition¶

roi = ee.FeatureCollection(
    get_gee_asset_path(state, district, block)
    + "filtered_mws_"
    + valid_gee_text(district.lower())
    + "_"
    + valid_gee_text(block.lower())
    + "_uid"
)

2. Data Source¶

slope_percentage_raster = ee.Image(SLOPE_PERCENTAGE)  # From constants.pan_india_urls

3. Raster Processing¶

raster = slope_percentage_raster.clip(roi.geometry())

Integration Points¶

computing/misc/slope_percentage.py
├── computing.utils
│   ├── save_layer_info_to_db()   # Database persistence
│   └── update_layer_sync_status() # Status tracking
├── utilities.gee_utils
│   ├── ee_initialize()           # GEE authentication
│   ├── check_task_status()       # Task monitoring
│   ├── valid_gee_text()          # Text sanitization
│   ├── get_gee_asset_path()      # Asset path generation
│   ├── is_gee_asset_exists()     # Asset existence check
│   ├── sync_raster_to_gcs()      # GCS synchronization
│   ├── sync_raster_gcs_to_geoserver() # GeoServer sync
│   ├── export_raster_asset_to_gee() # Raster export
│   └── make_asset_public()       # ACL management
└── constants.pan_india_urls
    └── SLOPE_PERCENTAGE          # Pan-India slope URL

Output¶

Dataset Name: Slope Percentage

Style Name: slope_percentage

Usage¶

from computing.misc.slope_percentage import generate_slope_percentage_data

result = generate_slope_percentage_data.delay(
    state="Rajasthan",
    district="Jaipur",
    block="Sanganer",
    gee_account_id=1
)

Pattern Classification¶

This module follows the Simple Raster Clip Pattern - identical to: - distancetonearestdrainage.py - naturaldepression.py - catchment_area.py

Dependencies¶

• ee (Google Earth Engine Python API)
• Celery - Distributed task queue