surtgis

High-performance geospatial analysis library for Python, powered by Rust.

SurtGIS provides 40+ terrain, hydrology, and imagery algorithms with native performance through PyO3 bindings.

Installation

pip install surtgis

Quick Start

import numpy as np
import surtgis

# Create a sample DEM (100x100 grid)
dem = np.random.rand(100, 100) * 100  # Elevation in meters
cell_size = 30.0  # 30m resolution

# Compute terrain derivatives
slope = surtgis.slope(dem, cell_size)
aspect = surtgis.aspect_degrees(dem, cell_size)
hillshade = surtgis.hillshade_compute(dem, cell_size, azimuth=315.0, altitude=45.0)

# Curvature analysis
profile_curv = surtgis.curvature_compute(dem, cell_size, ctype="profile")
plan_curv = surtgis.curvature_compute(dem, cell_size, ctype="plan")

# Advanced Florinsky curvatures (14 types available)
mean_h = surtgis.advanced_curvature(dem, cell_size, ctype="mean_h")
gaussian_k = surtgis.advanced_curvature(dem, cell_size, ctype="gaussian_k")

# Hydrology
twi = surtgis.twi_compute(dem, cell_size)  # Topographic Wetness Index
hand = surtgis.hand_compute(dem, cell_size)  # Height Above Nearest Drainage

print(f"Slope range: {slope.min():.1f} - {slope.max():.1f}")
print(f"TWI range: {twi.min():.2f} - {twi.max():.2f}")

Available Functions

Terrain Analysis (21 functions)

Function Description
slope(dem, cell_size) Slope in degrees or percent
aspect_degrees(dem, cell_size) Aspect in degrees (0-360)
hillshade_compute(dem, cell_size, azimuth, altitude) Analytical hillshade
multidirectional_hillshade(dem, cell_size) Multi-azimuth hillshade
curvature_compute(dem, cell_size, ctype) Profile, plan, or general curvature
advanced_curvature(dem, cell_size, ctype) 14 Florinsky curvatures
tpi_compute(dem, cell_size, radius) Topographic Position Index
tri_compute(dem, cell_size) Terrain Ruggedness Index
dev_compute(dem, cell_size, radius) Deviation from Mean Elevation
vrm_compute(dem, cell_size, radius) Vector Ruggedness Measure
geomorphons_compute(dem, cell_size, flatness, radius) Landform classification
mrvbf_compute(dem, cell_size) Multi-resolution Valley Bottom Flatness
northness_compute(dem, cell_size) Cosine of aspect
eastness_compute(dem, cell_size) Sine of aspect
shape_index_compute(dem, cell_size) Shape index
curvedness_compute(dem, cell_size) Curvedness
sky_view_factor_compute(dem, cell_size) Sky View Factor
viewshed_compute(dem, cell_size, observer_row, observer_col) Line-of-sight visibility
openness_positive(dem, cell_size) Positive openness
openness_negative(dem, cell_size) Negative openness
uncertainty_slope(dem, cell_size, dem_rmse) Slope uncertainty from DEM error

Hydrology (9 functions)

Function Description
fill_depressions(dem, cell_size) Planchon-Darboux sink filling
priority_flood_fill(dem, cell_size) Priority-Flood (Barnes 2014)
breach_fill(dem, cell_size) Breach depressions (Lindsay 2016)
flow_direction_d8(dem, cell_size) D8 flow direction
flow_accumulation_d8(fdir, cell_size) D8 flow accumulation
flow_accumulation_mfd_compute(dem, cell_size) Multi-flow direction accumulation
twi_compute(dem, cell_size) Topographic Wetness Index
hand_compute(dem, cell_size) Height Above Nearest Drainage
stream_network_compute(dem, cell_size, threshold) Stream network extraction

Imagery (4 functions)

Function Description
ndvi_compute(nir, red) Normalized Difference Vegetation Index
ndwi_compute(green, nir) Normalized Difference Water Index
savi_compute(nir, red, l_factor) Soil-Adjusted Vegetation Index
normalized_diff(a, b) Generic normalized difference

Morphology (4 functions)

Function Description
morph_erode(data, radius) Morphological erosion
morph_dilate(data, radius) Morphological dilation
morph_opening(data, radius) Morphological opening
morph_closing(data, radius) Morphological closing

Statistics (3 functions)

Function Description
focal_mean(data, radius) Focal mean
focal_std(data, radius) Focal standard deviation
focal_range(data, radius) Focal range (max - min)

Advanced Curvature Types

The advanced_curvature function supports 14 curvature types from Florinsky (2025):

  • mean_h - Mean curvature H
  • gaussian_k - Gaussian curvature K
  • unsphericity_m - Unsphericity M
  • difference_e - Difference curvature E
  • minimal_kmin - Minimal principal curvature
  • maximal_kmax - Maximal principal curvature
  • horizontal_kh - Horizontal (plan) curvature
  • vertical_kv - Vertical (profile) curvature
  • horizontal_excess_khe - Horizontal excess curvature
  • vertical_excess_kve - Vertical excess curvature
  • accumulation_ka - Accumulation curvature
  • ring_kr - Ring curvature
  • rotor - Rotor (flow-line torsion)
  • laplacian - Laplacian

Performance

SurtGIS is 5-10x faster than pure Python implementations thanks to Rust's zero-cost abstractions and automatic parallelization via Rayon.

License

MIT OR Apache-2.0

Project links

Data verified by PyPI on Aug 20, 2026
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Credits

Author: Francisco Parra

GitHub Statistics

Data verified by PyPI on Aug 20, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License

Apache Software License, MIT License (MIT OR Apache-2.0)

Requires

Python >=3.9

Provides Extra

numpy

Tags

gis geospatial terrain raster hydrology dem rust

Classifiers

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