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 Hgaussian_k- Gaussian curvature Kunsphericity_m- Unsphericity Mdifference_e- Difference curvature Eminimal_kmin- Minimal principal curvaturemaximal_kmax- Maximal principal curvaturehorizontal_kh- Horizontal (plan) curvaturevertical_kv- Vertical (profile) curvaturehorizontal_excess_khe- Horizontal excess curvaturevertical_excess_kve- Vertical excess curvatureaccumulation_ka- Accumulation curvaturering_kr- Ring curvaturerotor- 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
1 maintainer
Metadata
1 maintainer
Release files for surtgis 1.5.0
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | Provenance | Actions |
|---|---|---|---|---|
| surtgis-1.5.0.tar.gz | 1.1 MB | With provenance | Details for surtgis-1.5.0.tar.gz |
Built distributions (wheels)
| File | Actions Reset | |||
|---|---|---|---|---|
| surtgis-1.5.0-cp39-abi3-win_amd64.whl | CPython 3.9 | abi3 | Windows x86-64 | Details for surtgis-1.5.0-cp39-abi3-win_amd64.whl |
| surtgis-1.5.0-cp39-abi3-musllinux_1_2_x86_64.whl | CPython 3.9 | abi3 | Linux musl 1.2+ x86-64 | Details for surtgis-1.5.0-cp39-abi3-musllinux_1_2_x86_64.whl |
| surtgis-1.5.0-cp39-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl | CPython 3.9 | abi3 | Linux glibc 2.17+ x86-64 | Details for surtgis-1.5.0-cp39-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl |
| surtgis-1.5.0-cp39-abi3-macosx_11_0_arm64.whl | CPython 3.9 | abi3 | macOS 11.0+ ARM64 | Details for surtgis-1.5.0-cp39-abi3-macosx_11_0_arm64.whl |
| surtgis-1.5.0-cp39-abi3-macosx_10_12_x86_64.whl | CPython 3.9 | abi3 | macOS 10.12+ x86-64 | Details for surtgis-1.5.0-cp39-abi3-macosx_10_12_x86_64.whl |
Total release size: 17.5 MB
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